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By means of metallographic microscope, SEM, EDAX of molybdenum piece of CVD diamond film on the interfacial morphology and composition were studied, compared with magnetic field and without magnetic field by the deposition of diamond film cross-sectional……
Read More »As a new type of ray protection material, tungsten heavy alloy has been widely used in various kinds of CT, linear accelerator, PET, γ camera and other medical equipment, it can provide better ray protection and beam guidance.
Read More »Molybdenum charge products：Stainless steels, alloy steels, tool steels and high speed steels are usually smelted in an electric arc furnace. The initial charge generally contains alloy steel scrap, pig iron and some form of molybdenum to obtain the appropriate composition.
Read More »Nickel iron：The main components of nickel-iron are nickel and iron, and also contain Cr, Si, S, P, C and other impurity elements. Nickel is a yellowish silvery white metal, is a magnetic transition metal.
Read More »1. Radiation therapy：The use of one or more ionizing radiation for the treatment of malignant tumors.
Read More »Refractory molybdenum has excellent high temperature strength, creep resistance and low thermal expansion coefficient, Good thermal conductivity and corrosion resistance, so it is used in the electrical industry, aerospace industry and energy industry.
Read More »Tool steel and high-speed steel：One of the earliest applications of tantalum was used as a substitute for tungsten in tool steel and high-speed steel, which was effective and inexpensive.
Read More »Oil industry pipes:The continuous exploration of new sources of oil has made the development and development of deep oil layers necessary, and deep oil layers are often contaminated with corrosive hydrogen dioxide, carbon dioxide and perchlorinated brine, so that the AISI4100 series Cr-Mo steels containing 0.15% to 0.25% molybdenum are widely used.
Read More »Black material:Alloy steel, stainless steel, tool steel and cast iron are the main application areas of palladium, and their production volume determines the demand for palladium, whose role in the above-mentioned steel is as follows:
Read More »Molybdenum, chromium and aluminum salts can be deposited together to form molybdenum chromium red pigment. Molybdate ion and iron ion on the metal surface form insoluble Fe2 (MoO4) 3, which passivates the metal surface and achieves the effect of rust prevention.
Read More »Due to its excellent heat resistance and high temperature mechanical properties, molybdenum alloy can be used as flame guide and combustion chamber of aircraft engine, throat, nozzle and valve of liquid rocket engine of aerospace vehicle, end of reentry vehicle, skin, wing and guide plate of satellite and spaceship, and protective coating material.
Read More »It is more and more clearly recognized that molybdenum plays an important role in controlling environmental pollution. The large-scale application of molybdenum containing stainless steel greatly reduces the impact on the environment caused by corrosion.
Read More »In the development of sour natural gas and oil fields in low-lying areas and the development of subsea oil and gas fields, not only a large amount of H2S gas is produced, but also the seawater erosion makes the drilling pipeline sulfurized brittle and corroded rapidly.
Read More »(MoSi2) is a widely used electric heating element material, which has the characteristics of high temperature oxidation resistance, excellent corrosion resistance and high melting point.
Read More »Due to its high purity, high temperature resistance and low vapor pressure, molybdenum is often used to make heater and structural material of high temperature furnace. In the production process of tungsten, molybdenum and cemented carbide, the reduction furnace and sintering furnace are mostly made by molybdenum wire heating.
Read More »The melting point of molybdenum is as high as 2620 ℃, and it has good high temperature performance and corrosion resistance. Molybdenum has strong adhesion with steel, so it is the main thermal spraying material in the production of automobile parts.
Read More »Molybdenum is one of the essential "trace elements" in plants, accounting for about 0.5ppm of plant dry matter, which is indispensable and irreplaceable. In recent years, ammonium molybdate has been widely used as trace element fertilizer at home and abroad……
Read More »Molybdenum has good conductivity and high temperature performance, especially close to the thermal expansion coefficient of glass. It is widely used in manufacturing the core wire, lead wire, hook, bracket, side bar and other parts of spiral filament in bulb, and as grid and anode support material in electron tube.
Read More »According to the world molybdenum consumption statistics, the application of molybdenum in iron and steel industry still occupies the most important position. As an alloying element of steel, molybdenum can improve the strength of steel, especially the high temperature strength and toughness;
Read More »According to information, in 2001, China produced 72000 tons of molybdenum concentrate, 33000 tons of molybdenum oxide, 7600 tons of ferromolybdenum, 9500 tons of various ammonium molybdate, 1183 tons of molybdenum bars……
Read More »Molybdenum reserves on the earth are relatively small, accounting for only 0.001% of the weight of the earth's crust. The total molybdenum reserves are about 15 million tons, mainly distributed in the United States, China, Chile, Russia, Canada and other countries.
Read More »At present, more and more chips in our country are gradually localized, but many domestic chip production lines are imported, and the target material, as the key component of the chip production line, basically depends on import.
Read More »In semiconductor integrated circuits, thin film science is a very important research field in developing and manufacturing semiconductor devices. The target material is the key material in the surface coating technology.
Read More »Molybdenum target refers to that the anode of X-ray tube is made of molybdenum (MO). The relative energy of molybdenum target ray is relatively low, which is "soft" ray. Under the condition of lower tube voltage required by mammography, it is especially suitable for mammary glands with more adipose tissue and lower density of parenchyma, or with smaller thickness and higher density of parenchyma.
Read More »Cerium tungsten electrode
Cerium oxide is added to tungsten to produce cerium tungsten electrode.
Cerium tungsten has the following advantages over thorium tungsten
*Non radiation * low melting rate * long welding life * good arcing performance. Therefore, Ce-W is the best substitute for Th-W in low current welding environment.Ce-W electrode is mainly used in low current DC welding.
Because of the characteristics of tungsten, it is very suitable for TIG welding and other electrode materials similar to this kind of work. Adding rare earth oxide to tungsten metal to stimulate its electron work, the welding performance of tungsten electrode can be improved:
Read More »The shielding parts of high specific gravity tungsten alloy are made of "high density alloy", which is based on tungsten and added with a small amount of Ni, Co, Mo and other elements.
Read More »With the development of science and technology, the application of molybdenum in high technology and other fields is also increasing. Next, let's learn about the application of molybdenum and its alloys.
Read More »Someone asked: if you throw a huge tungsten ball with a diameter of 100 meters into a crater, can the tungsten ball sink to the center of the earth?
Read More »Although the melting point of tungsten is higher than that of rhenium, the processing difficulty of tungsten alloy is also higher, which is more brittle at high temperature and easier to be oxidized;
Read More »1. Pure molybdenum and high purity molybdenum
(1) Pure molybdenum
It includes sintered molybdenum products (such as crucible, etc.) and processing molybdenum plate, molybdenum bar, molybdenum strip, molybdenum wire, molybdenum sheet and profile, etc.
Improving the properties of molybdenum and molybdenum alloy is an inevitable way to expand the application field and meet the increasing performance requirements. A series of researches on high performance molybdenum and molybdenum alloys have been carried out at home and abroad.
Read More »With the development of science and technology, the application of molybdenum in high-tech and other fields is also increasing. Let's take a look at the application of molybdenum and its alloys.
Read More »At present, the main manufacturing methods of molybdenum and molybdenum alloy products are smelting, powder metallurgy, chemical vapor deposition, rolling and forging.
Read More »In refractory metals, molybdenum and its alloys have good thermal conductivity, conductivity and low expansion coefficient. They have high strength at high temperature (1100 ~ 1650 ℃), and are easy to process compared with tungsten. Therefore, their products are widely used in aerospace and nuclear industries, electronics, building materials, instruments and other industries.
Read More »Molybdenum was used in the early electronic industry. With the emergence of solid-state electronics, a new application field is gradually formed; the current application depends on the metal's high melting point, high heat transfer, machinability, strength and sinter ability.
Read More »Molybdenum plate with width from 400mm to 510mm is carried out on 550mm cold rolling mill, while molybdenum plate with width from 700 mm to 800mm is carried out on 1200mm four high reversing cold rolling mill.
Read More »The high temperature properties and microstructure of Mo La alloy and TZM alloy at 1000 ~ 1800 ℃ were studied. The results show that the molybdenum lanthanum alloy has higher comprehensive properties of strength and plasticity when the temperature is less than 1400 ℃.
Read More »Molybdenum and molybdenum alloy materials can be made by stamping, metal processing and welding. The surface of molybdenum alloy is processed with high precision. However, attention should be paid to the fact that molybdenum has high temperature strength but poor room temperature strength, and its toughness is not as good as that of carbon steel or brass.
Read More »Die castings can be processed with nonferrous metals and alloy iron, made from large amounts of molybdenum or tungsten, or with a small amount of zirconia. Die castings are usually used for multi face pressing and are specially designed to prevent delamination or cracking when pressing the bar.
Read More »After high temperature sintering, molybdenum powder is rolled into molybdenum discs. After polishing and corrosion, it is found that some batches of molybdenum discs have defects such as edge falling, delamination and small black spots on the surface.
Read More »Since the great development of vacuum sintering technology in cemented carbide production practice in 1960s, vacuum sintering technology has also been applied in the field of tungsten molybdenum powder metallurgy.
Read More »The molybdenum content of tungsten products is very strict, because the existence of molybdenum will seriously affect its performance. Limit its application scope. The chemical properties of tungsten and molybdenum are very similar, so it is very difficult to separate tungsten from molybdenum.
Read More »Since the service temperature of high temperature vessel of single crystal furnace is over 2000 ℃, tungsten crucible is the only choice for high temperature vessel of single crystal furnace.
Read More »As a derivative of raw material molybdenum wire, molybdenum strip is widely used in lighting industry, mainly used in high-pressure mercury lamp, high-pressure sodium lamp, metal halide lamp, film and television light source, and its quality has a great impact on the lamp life and interface welding quality.
Read More »Molybdenum is a kind of high temperature resistant material. It is widely used in modern industry, but its price is high. In order to reduce the cost, powder metallurgy production method is widely used to manufacture molybdenum products. Molybdenum crucible is one of them.
Read More »Molybdenum wire has high melting point, high strength and elastic modulus, small expansion coefficient, low vapor pressure, good electrical and thermal conductivity and excellent corrosion resistance.
Read More »Tungsten has excellent properties such as high melting point, high density and good high temperature conductivity. It plays an important role in national defense industry and national economy, especially in aerospace, nuclear industry and other cutting-edge fields.
Read More »When the metal material is deformed, the crystal will rotate, and most of the crystals will gather in some orientation position (or deviate from the random distribution), which is the result of texture formation.
Read More »In order to improve the yield of molybdenum wire and reduce wire breakage, the quality of raw materials should be improved firstly, and then the drawing process should be standardized and stabilized：
Read More »Due to the metal, ceramics, such as composite materials, the requirements of modern manufacturing technology for its heat treatment has become higher and higher, so the relevant production conditions have become increasingly stringent.
Read More »The preparation of tungsten, molybdenum products is mainly realized by powder metallurgy. After the ore is refined and then reduced (the oxides of W and Mo are reduced in hydrogen) to obtain the corresponding metal powder (purity above 99.9%).
Read More »Under uniaxial tension and compression, the single-phase amorphous alloy has high strength (about 2 GPa) and elastic strain (about 2%). However, the failure of amorphous alloy along a single shear band shows the characteristics of brittle material, that is, there is almost no plastic deformation.
Read More »Tungsten has unique characteristics, which is an important material for high temperature heating body and high temperature heat insulation. Its brittleness brings great difficulties to its deep processing, especially in the spinning thinning process of P / M tungsten tube blank under multi-directional force, even if the tube blank with good deformation performance can be produced.
Read More »Porous tungsten as a high current density cathode is one of the important applications of tungsten. Its porous framework is an important part of reserve cathode. The framework should be impregnated with electron emission compounds.
Read More »Tungsten, due to its unique physical and chemical properties, is widely used in the field of high temperature resistance and high strength. However, the content of tungsten in the earth's crust is very low, and the resources are also continuously depleted.
Read More »Molybdenum disc is the support of contact electrode and silicon rectifier of silicon controlled silicon element. With the rapid development of electronic industry, the output of silicon molybdenum components is also increasing.
Read More »Porous tungsten and its components based on porous tungsten are widely used in aerospace, power electronics and metallurgical industry. For example: vaporizer of mercury ion rocket engine;
Read More »Roller track:The roller track of molybdenum crucible is in the order of a → B → C → D → e → f → g → h → I → J → K. It is composed of five curves, namely, the forward cutter curve, the reverse cutter curve, the feed curve, the die sticking curve and the exit curve.
Read More »Pore characteristics：The basic physical phenomenon of mercury intrusion method is to force non wetting and non reactive liquid mercury into porous samples under a given external pressure.
Read More »Molybdenum is a rare metal, an important non renewable strategic material, and an important basic material for realizing national modernization and building modern national defense. Molybdenum is a non renewable resource. With its increasingly extensive application, the demand is increasing, and its price is getting higher and higher.
Read More »The porous tungsten framework sintered at high temperature is easy to be brittle and cannot be machined. As mentioned above, tungsten copper (plastic) material is obtained by infiltrating copper or plastic to improve its processing performance, and then turning is carried out.
Read More »The porous tungsten billets sintered at high temperature are brittle and can not be machined. The turning performance can be improved after copper infiltration.
Read More »In microwave vacuum electronic devices, cathode as an electron emission source, its performance directly affects the performance and life of the device, which is referred to as the "heart" of vacuum electronic devices.
Read More »As an important refractory metal material, tungsten has the characteristics of high melting point, high thermal shock resistance, high thermal conductivity, low expansion coefficient, low vapor pressure and good radiation resistance. It has extremely important applications in aerospace, nuclear industry, chemical industry and other extreme environment fields.
Read More »Because of its high strength at room temperature and high temperature, excellent wear resistance, corrosion resistance and good thermal physical properties, refractory metal molybdenum is widely used in aerospace, electrical and electronic fields.
Read More »(1) Molybdenum alloy with purity over 99.9% produced by sputtering method is used as raw material. Molybdenum alloy is put into the feeding device of electron beam cooling bed furnace, that is, spiral tube.
Read More »Molybdenum foil has pure molybdenum foil and rare earth molybdenum foil. The addition of rare earth oxides to molybdenum can significantly improve the microstructure, recrystallization temperature and high temperature properties of the materials. Due to the different physical and chemical properties of different rare earth oxides, the properties of alloy materials are different.
Read More »Because of its good room temperature plasticity, high temperature strength and good plasticity after recrystallization, molybdenum alloys are widely used in electric vacuum devices, such as grid insulation screen.
Read More »Ion exchange separation of molybdenum and rhenium is based on the high selectivity of the resin for specific ions such as mo. baht. In the solution, Lai and Mo exist in the anion form of REO * and moo.
Read More »(1) Application in aerospace industry. The first generation of tungsten based high specific gravity alloys developed in China in the 1960s were developed. Since its birth, it has been successfully used in the navigator of the first man-made satellite developed by China.
Read More »Because of its high strength, good thermal conductivity and good processing performance, molybdenum is used as the substrate material of silicon rectifying elements and silicon controlled silicon components (the support of silicon wafer molybdenum disc).
Read More »Among many welding methods, TIG and plasma arc welding are developing rapidly. In pressure vessel, boiler and chemical equipment manufacturing industry, the former is widely used in the welding of thin-walled pipe, thick wall pipe and nozzle back weld, stainless steel pipe fittings and forming parts, and the latter is used in aerospace, nuclear energy, electronics, shipbuilding and other industrial sectors.
Read More »Quality of raw materials: the quality of raw materials directly affects the product quality of molybdenum wafers, and directly affects the parameters of silicon rectifying elements and silicon controlled silicon elements.
Read More »Molybdenum is a refractory metal. Molybdenum and its alloys have been widely used in aerospace, national defense, military industry, electronic and electrical metallurgy and glass industry because of their excellent electrical conductivity, thermal conductivity, corrosion resistance, low thermal expansion coefficient, high hardness and high temperature strength.
Read More »Molybdenum is usually strengthened by microalloying, carbide strengthening, solution strengthening and dispersion strengthening. (1) Micro alloying is mainly to add trace Ti, Zr, B, La and other alloy elements, the amount of which is 0.1% ~ 1% for solution strengthening.
Read More »Molybdenum is a refractory metal. Key and its alloys are widely used in aerospace, defense and military industry, electronic and electrical, metallurgy and glass industry due to their excellent electrical conductivity, thermal conductivity, corrosion resistance, low thermal expansion coefficient, high hardness and high temperature strength.
Read More »Molybdenum and molybdenum alloy materials can be made by machining, forming, metal processing and welding. The surface of molybdenum and molybdenum alloy is smooth and high precision after machining.
Read More »Electronic power equipment manufacturing industry is the main application field of molybdenum and molybdenum alloy materials. It includes filament, lighting and electronic tube components, special printed circuit board coating, microwave devices, medical electronic and electrical equipment, internal components of light tube ……
Read More »Molybdenum belongs to refractory metal, body centered cubic structure, with good conductivity and thermal conductivity, low thermal expansion coefficient, good corrosion resistance and environmental friendly and other sub components and electronic products, such as thin film semiconductor tube liquid crystal display (TFT-LCD) plasma display, field emission display, touch screen, can also be used in solar cell back electrode, glass coating and other fields.
Read More »In modern TFT-LCD manufacturing, molybdenum film is mainly used as the barrier layer of Al in conductive film, and part of molybdenum film is used as barrier layer of Al in conductive film.
Read More »Tungsten targets are mainly used in aerospace, rare earth smelting, electric light source, chemical equipment, medical equipment, metallurgical machinery, smelting equipment, petroleum, etc.
Read More »Tungsten alloys have many excellent properties after high temperature liquid phase sintering, such as high density, high melting point, high hardness, wear resistance, high tensile strength, high elongation, high temperature resistance, etc.
Read More »The influence of molybdenum foil width on the experiment was analyzed by analyzing the structure, working principle, sensitivity and measuring range of the magnetic deflection mass spectrometer. The optimum width of molybdenum strip is 0.60-1.00mm.
Read More »During unidirectional rolling, banded cell structure is formed in the molybdenum plate, which results in obvious anisotropy. The cross rolling is to process the molybdenum plate in the longitudinal and transverse directions, which can strengthen the uniformity and equiaxed effect of the internal structure of the material, effectively reduce the anisotropy of the material and improve its deep drawing performance;
Read More »The quality of the slab with open edge at 1 300 ℃ and 1 400 ℃ is good. If the opening temperature is too high, it will not only make the grains coarse and waste resources, but also have a negative impact on the structure and properties of the finished molybdenum sheet……
Read More »With the unprecedented development of the national economy, molybdenum and its alloys have been applied to the fields of electronics, machinery, aviation, military and so on in various forms.
Read More »Due to its high melting point, excellent high temperature strength, good conductivity and thermal conductivity, high wear resistance, good processability and low cost, molybdenum has become an ideal high temperature structural material under harsh conditions.
Read More »In the application of molybdenum products, sheet is the most widely used. When it is used to make all kinds of electric vacuum devices, molybdenum sheet should not only have enough strength, but also high plasticity and low anisotropy.
Read More »The tensile strength, yield strength and elongation of 0.5mm thick molybdenum plate annealed by different processes were measured by shear tensile test on electronic universal tensile testing machine (see table).
Read More »Although molybdenum has been discovered for more than 200 years, its large-scale development and utilization is still in this century, especially in recent decades.
Read More »The outbreak of the first World War led to a sharp increase in the demand for tungsten, and the supply of ferrotungsten was extremely tight. Therefore, molybdenum replaces tungsten in many high hardness and impact steels.
Read More »Molybdenum is a transition metal element with a value of 42 on the periodic table. Its chemical symbol is molybdenum. Molybdenum is silvery white, hard and tough. It does not react with hydrochloric acid or hydrofluoric acid.
Read More »There were 18 technicians who did not rest that summer in 1991. They translated the basic documents of foreign equipment, such as reduction furnace and airflow disperser, in the field of tungsten and gold manufacturing word by word.
Read More »The monitoring results of monthly prosperity index of China's tungsten and molybdenum industry show that in July, the prosperity index of China's tungsten and molybdenum industry was 25.1, up 2.6 points from the previous month, and has entered the "normal" range; the first composite index was 44.5, up 0.1 point compared with the previous month.
Read More »The properties of molybdenum and tungsten are very similar, its boiling point and conductivity are outstanding, and its linear thermal expansion coefficient is small, so it is easier to process than tungsten.
Read More »Molybdenum is a rare metal with high melting point (2620 ± 10 ℃), high elastic modulus (320-360 GPA), small linear expansion coefficient (20-100 ℃, 5.8x10-6-6.2x10-6), high melting point, low steam pressure and low evaporation rate.
Read More »The reason why liquid crystal displays such as mobile phones and televisions can display images depends on a thin layer of metal film on the glass substrate that can not be seen by the naked eye.
Read More »Sputtering, as an advanced thin film preparation technology, has two characteristics: high speed "and" low temperature ". It uses the ions produced by the ion source to accelerate the aggregation of high-speed ion current in vacuum and bombard the solid surface.
Read More »Molybdenum is widely used in the downstream, and is currently used in iron and steel industry, machinery, electronics, mining, agriculture, medicine and other fields, is an important resource.
Read More »Super heat resistant alloy and nickel base alloy molybdenum can improve the corrosion resistance of stainless steel, and it can also enhance the corrosion resistance and mechanical properties of nickel base alloy. Many nickel base alloys with high molybdenum content and strong corrosion resistance are widely used in many fields.
Read More »Storage molybdenum never appears as a natural element, but is always combined with other elements. Although many molybdenum minerals have been discovered, molybdenite (MoS2), a natural sulfide of molybdenum, is the only one with industrial mining value.
Read More »The properties of molybdenum and tungsten are very similar. Its boiling point (5560 °) and electrical conductivity are outstanding, and the coefficient of linear thermal expansion is small. The results show that the thermal conductivity [135 w / (m · K)] and specific heat [0.276 KJ / (kg · K)] are the best combination, which makes it a natural choice for thermal shock resistance and thermal fatigue resistance.
Read More »Tungsten and molybdenum materials are often used in different industries because of the following nine properties:
Read More »Molybdenum and molybdenum alloys have the characteristics of high temperature strength and high temperature hardness, good thermal and electrical conductivity, and good corrosion resistance. Therefore, it is widely used in chemical industry, metallurgy and aerospace industry.
Read More »The high melting point of molybdenum has become one of the main technical problems in the production of molybdenum. However, for the rapidly developing industry in the 20th century, it is the high melting point that attracts people. Almost every technological leap has something to do with the application of molybdenum.
Read More »Tungsten and its alloys are widely used in electronic and electric light source industries. It is used to manufacture all kinds of light bulbs. The filament of electron tube is made of doped tungsten filament with anti droop property.
Read More »The melting point of tungsten is 3410 ℃, the boiling point is about 5900 ℃, and the thermal conductivity is 174 w / m · K at 10-100 ℃. At high temperature, the evaporation rate is slow and the coefficient of thermal expansion is very small.
Read More »Tungsten and molybdenum react with carbon and carbonaceous gases: all kinds of carbonaceous gases and solid carbon (carbon black, coal, graphite) react with tungsten and molybdenum in the range of 1000-1200 ℃, forming carbides (W3C, WC and Mo2C, MOC), and the reaction is intensified at 1400-1600 ℃. Even if there is a small amount of carbide impurity in tungsten and molybdenum, it will make tungsten and molybdenum brittle.
Read More »Tungsten disulfide nanosheets are expected to improve the performance of LiFePO4 cathode materials. In the industrialization of lithium-ion battery, cathode materials are becoming the main bottleneck of its development.
Read More »His is the first layer of circuit that links transistors with other circuits in the chip. With this innovative selective deposition technology, the contact resistance that affects transistor performance and increases power consumption can be reduced.
Read More »Molybdenum pin, also known as molybdenum needle. It is like a needle like molybdenum product, its surface is bright and smooth. Due to its high melting point, corrosion resistance, good tensile strength and low coefficient of thermal expansion, molybdenum needle is widely used in electronic, chemical, mechanical equipment, electroplating equipment, environmental protection equipment and precision processing industries.
Read More »The main component of molybdenum electrode is molybdenum, which is prepared by powder metallurgy process. The content of molybdenum electrode is 99.95% and the density is more than 10.15g/cm3 to ensure the quality of glass and service life of electrode.
Read More »The main component of molybdenum electrode is molybdenum, which is prepared by powder metallurgy process. The content of molybdenum electrode is 99.95% and the density is more than 10.15g/cm3 to ensure the quality of glass and service life of electrode.
Read More »Molybdenum rhenium alloy is a kind of alloy composed of molybdenum and rhenium. The alloy shows rhenium effect to improve plasticity. The rhenium content in the alloy is generally 11% ~ 50% (mass fraction).
Read More »At present, ceriated tungsten electrode, which has no radioactive pollution, is a green environmental protection product. It can start arc easily with a small current, and the arc current is relatively small. Under the condition of low current direct current, ceriated tungsten electrode is very popular.
Read More »Argon arc welding (TIG) of tungsten plate is gas shielded welding with tungsten needle as one electrode of arc. Tungsten electrode, as an immiscible electrode, requires high melting point, less volatilization at high temperature and high strength at high temperature! The melting point of tungsten is 3690k, its boiling point is 5900k, and its red heat intensity is high. It is an ideal non melting electrode material.
Read More »The alloy based on tungsten with rhenium is a kind of tungsten alloy. The typical rhenium contents in the alloy are 1%, 3%, 5%, 10%, 20%, 25% and 26%, etc. Microcracks are often formed on the interface of tungsten.
Read More »The platinum alloy is composed of platinum base and tungsten. It forms a simple peritectic phase diagram, and the peritectic reaction temperature is about 2460 ℃. With the increase of tungsten content, the strength of Pt-W alloy increases significantly.
Read More »A niobium alloy is formed by adding a certain amount of tantalum and tungsten based on niobium. This kind of alloy has high tensile strength at high temperature and creep deformation resistance, so it has important application in spacecraft.
Read More »Tantalum based alloy is formed by adding a certain amount of tantalum. The Ta-W binary alloy composed of TA and W is an infinite solid solution. The strength of the alloy increases with the increase of tungsten content, but the plasticity of recrystallized alloy decreases significantly when the content of tungsten exceeds 12% ～ 14%.
Read More »A silver alloy consisting of silver and tungsten. Silver and tungsten are immiscible in both liquid and solid state. Silver tungsten alloy can only be made into sintered materials by powder metallurgy or extrusion.
Read More »A tungsten alloy based on tungsten and added with nickel, iron, copper, and other elements. The tungsten content of the alloy is 85% ～ 98%, which is prepared by powder metallurgy process. The alloy was first invented by J.C. McLennan in 1935.
Read More »It includes molybdenum tungsten alloy based on molybdenum and tungsten molybdenum alloy series based on tungsten. The alloy can be formed in any proportion and is a complete solid solution alloy at all temperatures.
Read More »Under the protection of inert gas, an arc welding method is used to melt the base metal and filler metal (if filler metal is used) by using the arc generated between the tungsten electrode and the workpiece, referred to as TIG welding.
Read More »In addition to carbide, tungsten partly dissolves into iron to form solid solution. Its effect is similar to that of molybdenum, and its general effect is not as significant as that of molybdenum. The main pattern of tungsten in steel is to increase tempering stability, red hardness, thermal strength and wear resistance due to carbide formation.
Read More »Molybdenum in steel can improve hardenability and thermal strength, prevent temper brittleness, increase remanence and coercivity and corrosion resistance in some media.
Read More »Molybdenum Copper alloy cast iron is the material of roll, and roll is a large consumption accessory in steel rolling production. The quantity and quality of rolled steel are closely related to roll. Automation, continuous and heavy rolling process are the development direction of modern rolling technology.
Read More »The manufacturing method of rivet type tungsten copper and silver tungsten all contacts is to make tungsten copper and copper materials at one time, and then the material is formed by mechanical manufacturing. Advantages and features l the bonding part of tungsten copper material and copper material does not use any flux and solder to ensure that the touch resistance of rivet type electrical contact is minimized.
Read More »MoCu alloy is actually a pseudo alloy composed of two immiscible metals, but it has the characteristics of Mo and Cu and has good comprehensive properties. The main characteristics of Mo Cu alloy are as follows:
Read More »To silver tungsten alloys in dilute nitric acid, energetic response due to the silver can dissolve in dilute nitric acid generated, but tungsten can't dissolve in dilute nitric acid, this filter can get rid of tungsten……
Read More »W-Cu alloy is a two-phase "pseudo alloy" composed of tungsten and copper. Because tungsten is insoluble with other metals, it is difficult to electroplate W-Cu alloy. Tungsten copper alloy electroplating claims are as follows:
Read More »1、 Price of tungsten concentrate drops to cost line operation
From January to may, the price of domestic tungsten concentrate operated in the range of 7400-93000 yuan / ton. After the global spread of the new crown epidemic in mid March, due to market panic, the demand decreased sharply, the price of tungsten concentrate fell rapidly from 93000 yuan / ton, fell to 74000 yuan / ton in mid April, and consolidated at a low level.
1. Forging characteristics of tungsten, molybdenum and their alloys
The melting point of tungsten, molybdenum and their alloys is much higher than that of titanium, and the required forging temperature is very high, all above 1300 ℃. Even at such a high temperature, the deformation resistance is still very high. Therefore, the forging equipment is required to have large capacity and high strength, and the working temperature of the heating equipment is required to be high.
In the development of filament materials, rhenium or cobalt can further improve the properties of W-Al alloy. When 3% Re is added, the elongation of WAl2 filament annealed at 2750 ℃ for 3 minutes can reach 25.7%. Even when the RE content is as low as 0.25%, the elongation can reach 6%;
Read More »Decomposition method of tungsten concentrate: fire method and wet method.
① sodium carbonate sintering is commonly used for pyrolysis. In this method, wolframite concentrate and sodium carbonate are placed together in a rotary kiln and sintered at 800-900 ℃.
Molybdenum, like other elements such as copper, iron and zinc, is a trace element closely related to life. Molybdenum exists in human body, animals and plants. So, do you know the relationship between molybdenum and human health, molybdenum and animal health, molybdenum and plant health?
Read More »TIG welding (abbreviated as tungsten insert gas welding) has been widely used since Hobart and Devers invented the tungsten inert gas welding in 1920s. As the name suggests, TIG welding is a welding method that uses the arc heat generated between the tungsten electrode and the weldment to melt the weldment and filler wire under the protection of inert gas. Its characteristics are as follows:
Read More »TIG welding (abbreviated as tungsten insert gas welding) has been widely used since Hobart and Devers invented the tungsten inert gas welding in 1920s. As the name suggests, TIG welding is a welding method that uses the arc heat generated between the tungsten electrode and the weldment to melt the weldment and filler wire under the protection of inert gas. Its characteristics are as follows:
Read More »Tungsten and its alloy have high hardness and high work hardening speed, so heat treatment must be carried out. For example, for 0.3x200mm thin tungsten plate, the stress shall be eliminated immediately after warm processing, otherwise it may crack by itself, and the cracking is more serious if the processing amount between two annealing is too large (such as 80-90%).
Read More »When it comes to molybdenum fertilizer, we always start with such a story. This is a strange thing happened in New Zealand pastures several decades ago (at that time): due to the bad weather, the pastures planted by farmers in the pastures are almost short and small, and even yellow and withered. It looks like a yellow ocean in the past. But there is a small plot of grass that grows well, like a small green island. What's the matter?
Read More »In the periodic table, tungsten and molybdenum have silver gray luster on the surface of VIB group elements, and the powder is dark gray. Their commonness it is characterized by high melting point, strength and modulus of elasticity, small expansion coefficient, low vapor pressure, good conductivity and thermal conductivity, and superior corrosion resistance. Its disadvantages are low temperature embrittlement and high temperature oxidation.
Read More »In the periodic table, tungsten and molybdenum have silver gray luster on the surface of VIB group elements, and the powder is dark gray. Their commonness it is characterized by high melting point, strength and modulus of elasticity, small expansion coefficient, low vapor pressure, good conductivity and thermal conductivity, and superior corrosion resistance. Its disadvantages are low temperature embrittlement and high temperature oxidation.
Read More »First of all, it should be understood that the working environment of turbine blade in aeroengine is high temperature (above 1000 ℃), high pressure (above 100MPa), and strong centrifugal force. In addition, the blade should work stably in this environment, and it should not creep or damage. This requires high temperature resistance and creep resistance of the materials used for blades.
Read More »Influenced by the trade friction between China and the United States, China's export of tungsten products is limited to some extent, while the real consumption demand for tungsten products in the international market is also gradually weakened.
Read More »The technical difficulty of tungsten industry mainly lies in the deep processing. China's cemented carbide is gradually upgrading to high-precision and high-grade products.From the perspective of industrial chain, tungsten ore is processed by coarse crushing, gravity beneficiation and concentration to obtain tungsten concentrate; then ammonium Paratungstate Crystal with high purity and complete crystal varieties can be obtained through alkali pressure boiling, ion exchange, evaporation crystallization and other technologies;
Read More »The dominant production of tungsten resources in China is mainly concentrated in South China.China's tungsten resource reserves are 1.9 million tons, accounting for 57.58% of the world's largest: the world's tungsten resources are mainly concentrated in the Alps Himalayas, the Pacific Rim geological belt and the Mediterranean and Europe's coastal Atlantic region.
Read More »Tungsten industry giant's strong production reduction and constant consumption of inventory in price protection industry
On May 17, 2019, China Tungsten Industry Association, together with ten presidium members, spontaneously held an industry Symposium. The output of tungsten concentrate of the participating enterprises reached 86% of the national annual output. It was decided that this year's combined production reduction of tungsten concentrate should not be less than 10%.
Tungsten: steel gray or silver white, high hardness, strong ductility, melting point up to 3410 ℃, free from air erosion at room temperature, good conductivity and thermal conductivity, usually used as steel, alloy, lighting or chemical production materials.
Read More »Scheelite is an intermediate member of the complete homogeneous series of tungsten iron ore (FeWO4)-tungsten manganese ore (MnWO4). Theoretical Composition (ωB/%): tungsten iron FeO 23.65,WO376.35; tungsten manganese MnO 23.42,WO3 76.58.
Read More »Tungsten is a widely distributed element, almost all over the rocks, but the content is low. The ore deposit can be formed as commercial ore mining through the enrichment of relevant geological action.
Read More »The Hubei Geological Survey found a new small tungsten deposit in Wangjiatai area of Suixian. Six gold, silver and tungsten polymetallic ore bodies were preliminarily delineated in the mining area. The total WO334 resources verified by engineering are estimated to be 5752 t, which further broadens the prospecting direction of altered rock type and quartz vein type gold, silver and tungsten polymetallic ore in Suibei area.
Read More »I. Seedling stage, mainly supplemented with molybdenum and boron
Peanut molybdenum and boron need to be sufficient, boron deficiency will appear fruit and no kernel phenomenon, gravure fruit and empty shell fruit increase, grain deformity becomes smaller, less flowering results, empty fruit seedless, boron deficiency is generally difficult to find, once the symptoms have been late.
The gap in molybdenum supply is expected to be 1.33,2.16 and 30300 tons in 2019-2021, and molybdenum prices are expected to continue to rise. By combing the production capacity and business plans of the world's major molybdenum producers, we expect a small increase in global molybdenum production, with the annual compound growth rate of about 1% in the next three years, while the global molybdenum consumption growth rate is expected to remain around 4% in the……
Read More »China's crude steel production climbed to 49% in the decade from 2007 to 2017. With China's crude steel production growth and structural optimization, China's molybdenum consumption growth is expected to continue to be higher than the global consumption growth rate.
Read More »In 2018, the production of alloy steel in the national key Youte steel enterprises was 31.57 million tons, an increase of 11% over the same period last year, and the compound growth rate from 2015 to 2018 was as high as 16.5%. Alloy steel is widely used in construction engineering, machinery manufacturing, automobile, ship, nuclear industry, military weapons and equipment industries.
Read More »Global molybdenum consumption growth is expected to remain around 4% in 2019-2021. According to the International Molybdenum Industry Association (IMOA), the global molybdenum consumption in 2018 was 264400 tons, an increase of about 4.4 percent over the same period last year, and the global molybdenum consumption in 2017 was 253100 tons, an increase of 8.9 percent over the same period last year, and the annual compound growth rate of global molybdenum consumption in the past decade was 2.2 percent.
Read More »Molybdenum - Important Adding Element in Steel Industry molybdenum Mo, atomic number 42, with an average content of 0.00011% in the crust, is a silver-white rare metal. Molybdenum is mainly used in iron and steel industry, which can improve the strength, elastic limit, wear resistance and corrosion resistance of steel, accounting for about 80% of the total consumption of molybdenum.
Read More »Application of molybdenum The application of molybdenum in iron and steel industry occupies the leading position, accounting for about 80% of total consumption of molybdenum, followed by chemical industry, accounting for about 10%.
Read More »Molybdenum and tungsten are homogeneous chemical elements. Tungsten is heavier than molybdenum and has more stable chemical properties. What about their sulfide properties?
Read More »"China's molybdenum capital ", has proven molybdenum reserves first in Asia, scheelite reserves second in the country, molybdenum tungsten mining industry has long been a pillar industry.
Read More »The common causes of failure of TIG arc welding machine and its maintenance methods are as follows:
Read More »Adults generally need 0.15~0.3 mg of molybdenum per day. due to the relatively widespread presence of molybdenum in food, such as chrysanthemum, wheat, beans, milk.
Read More »Pure molybdenum wire is used in high temperature electric furnace; molybdenum sheet is used to make radio equipment and X ray equipment; adding molybdenum to alloy steel can improve elastic limit, corrosion resistance and maintain permanent magnetism. Molybdenum is one of the seven micronutrients needed for plant growth and development, without which plants can not survive. Animals and fish, like plants, also need molybdenum.
Read More »In the late 1950s, something strange happened on a New Zealand ranch. At that time, the scenery was not good, grass withered yellow low, some are dying. But a very lush green pasture belt miraculously grew across the pasture.
Read More »Tungsten is a widely distributed element, which is almost common in all kinds of rocks but low in content.
Read More »It is not effective to improve the high temperature strength of tungsten simply by solid solution strengthening. However, on the basis of solid solution strengthening, dispersion (or precipitation) strengthening can greatly improve the high temperature strength, ThO2 and precipitation of HfC dispersion particles have the best strengthening effect. Both the w-hf-c and w-tho2 alloys……
Read More »Sintering process The sintering molding of tungsten steel is to press the powder into the blank, then heat it into the sintering furnace to a certain temperature (sintering temperature), and maintain a certain time (holding time), and then cool down, so as to obtain the required properties of tungsten steel material.
Read More »Tungsten steel, also known as cemented carbide, refers to sintered composites containing at least one metal carbide composition. Tungsten carbide, cobalt carbide, niobium carbide, titanium carbide and tantalum carbide are common components of tungsten steel.
Read More »Filament industry tungsten was first used to make incandescent filament. Colegi (W.D.Coolidge) of the United States in 1909 using tungsten powder pressing, remelting, rotary forging, wire drawing process to make tungsten wire, since then tungsten wire production has been rapid development.
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