SPS diffusion welding method of molybdenum alloy and tungsten alloy
Molybdenum alloy is an alloy formed by adding various alloying elements (such as Ti, Zr, Hf, W and rare earth elements, etc.) as molybdenum matrix. It has high recrystallization temperature, excellent high temperature mechanical properties and good corrosion resistance. It has been widely used in aviation, aerospace, nuclear energy and other fields, such as: With its excellent high temperature mechanical properties, it can be used in the heat dissipation panel of spacecraft, the nozzle of rocket engine, and the valve body of torpedo engine to withstand high temperature. Using its good corrosion resistance to liquid metal, it can be used to make stirring spindles in glass furnaces. It can also be used for X-ray rotating anode parts, die casting molds, isothermal forging molds for advanced deformable materials, heating bodies in high temperature furnaces and insulation layers.
Tungsten alloy is a tungsten matrix (W content 85 ~ 99wt %) with Re, Ti, Cr and other elements of the alloy system, with high melting point, high density, high hardness, low thermal expansion coefficient, good corrosion resistance and oxidation resistance, excellent electrical and thermal conductivity and ray absorption ability and other excellent properties. It has become a key material in the fields of defense industry such as weapons and equipment, aerospace, atomic energy and microelectronics information, electrical engineering, machining and other cutting-edge technologies. For example, in the field of weapons, it can be used for ultra-high speed kinetic energy armor-piercing shells; In the field of nuclear fusion, plasma-oriented materials can be used in fusion reactor Tokamak devices.
The effective connection of molybdenum alloy and tungsten alloy is the key to expand the application of refractory alloys in aerospace, nuclear energy and other fields. However, due to the large differences in the physical and chemical properties of the two materials (such as large differences in melting points), the connection between the two is very difficult. At present, fusion welding, brazing, solid phase diffusion connection and instantaneous liquid phase connection are mainly used to realize the connection of superalloys.
