Tungsten molybdenum alloy
Tungsten-molybdenum alloy is an alloy containing molybdenum and tungsten, which 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 completely solid solution alloy at all temperatures.
Molybdenum (Mo) tungsten (W) two elements in the same column of the periodic table. They also exhibit the same properties. Two elements in the earth's crust at an average concentration of 1.5 parts per million. Molybdenum is an essential nutrient for plants and animals. At high concentrations, molybdenum can cause poisoning which is sometimes the case from alkaline ash leachate. Tungsten is an important strategic metal and is used in a variety of industrial applications.It is usually mined from scheelite, powder CaWO4, and optical channel wolframite (iron, manganese) WO4. Tungsten is released into the environment, for example through its use in winter tyres and ammunition. The environmental behaviour of tungsten is not well known in general.
In the environment, molybdenum and tungsten, mainly in the form of anions, molybdenum (MoO42-) and tungsten (WO42-), are protonated and polymerized in reduced conditions (e.g., in lake bottom sediments), and other species may form due to reduced molybdenum-tungsten valence states by hot plating.
Molybdenum-tungsten alloys have been known for a long time. Iron and aluminum oxides can be bound to soil and sediment, and this process may determine the decomposition of molybdenum-tungsten alloys, but few studies have made quantification of this process. There are also possible signs of Mo and W binding to organic matter. The aim of this project is to quantify the combination of molybdenum-tungsten alloys with iron (an iron oxide) and organic materials. This will allow better assessment of the mobility of molybdenum and tungsten in the environment.
Tungsten molybdenum alloy application
Tungsten-molybdenum alloys often find important applications in different industries because of the following nine properties.
High melting point
Extremely low vapor pressure (especially important for refractory and vacuum industry applications).
High physical strength at high temperature (for structural parts in high temperature environment)
Creep resistance (high temperature load structure. High dimensional stability. For example: large aeroengine turbine blade forging die.
High elastic modulus
Very low thermal expansion coefficient (very important for applications of metal-ceramic, metal-semiconductor, and metal-graphite structures. For example, in LED field, v-LED which is regarded as the future of high-power LED will use molybdenum or molybdenum copper material as the base material)
Excellent conductivity (metal properties)
Excellent thermal conductivity (metal properties)
Selective resistance to erosion
The application of tungsten
Our most common use of tungsten is probably in the lighting industry. Such as tungsten filament. But besides tungsten wire, many people may not know that tungsten has a wider application in the lighting industry. For example, the electrode of high power gas discharge lamp, the electrode of short arc lamp and so on.
In the semiconductor or electron tube industry, tungsten is used as an electron emitter because it has a similar thermal expansion coefficient with silicon and can improve the electron emission performance. In the medical device industry, tungsten improves high temperature brittleness by mixing small amounts of rhenium oxide (Re), which can be used to make X-ray machines
Ray target. The gamma shielding ability of tungsten or its alloys can also be used to make gamma shielding/focusing systems for radiotherapy equipment.
Tungsten and copper composite materials in military applications (such as missile balance wing) and high voltage/uHV power transmission and transformation industry has a large mold application, high voltage switch arc contact, used to break the short circuit current in 10KV-1000kV high voltage line, requires a strong arc ablation resistance. Tungsten and graphite composite material has a very important application in thermonuclear fusion industry. Data: Application of tungsten and its composite materials in electric power Industry Tungsten can also be used to make heaters and crucible in quartz glass melting and the inner liner of high-temperature sintering furnace because of its high melting point.
The application of molybdenum
Generally speaking, molybdenum and tungsten are similar in nature, but molybdenum is cheaper and easier to process. Molybdenum is also close to tungsten in application. In the lighting industry, for example, reflector bowls are used in filament supports and car headlights. A molybdenum strip made of mixed CeO2 and Y2O3 used for sealing wires in quartz lamps. Make electrodes or structural parts in an electron tube. A Base plate used as a silicon element in a thyristor.
In practice, tungsten and molybdenum materials are far more widely used than what is introduced in this paper, no matter in space shuttle, spacecraft, aircraft, cars, electronic equipment, military weapons, tungsten and molybdenum materials can be used.
