Molybdenum alloys is nonferrous alloys with other elements added to the Molybdenum substrate. The main strengthening approaches of Molybdenum alloys are solution strengthening, precipitation strengthening, dispersion strengthening and compound strengthening. The main alloys elements are Titanium, Zirconium, Hafnium, Tungsten and rare earth elements. Molybdenum alloys has good thermal and electrical conductivity and low coefficient of expansion. They have high strength at high temperature (1100 ~ 1650℃) and are easier to process than Tungsten. It can be used as grid and anodes for electron tubes, support materials for electric light sources, and parts for die-casting and extrusion molds, spacecraft, etc.
The Molybdenum alloys produced in industry are Molybdenum Titanium Zirconium, Molybdenum Tungsten and Molybdenum rare earth alloys.
TZM alloys is an excellent material for high temperature Molybdenum alloys at present. The temperature of recrystallization is about 1400℃, much higher than that of Molybdenum.
TZM alloy has been widely used in aerospace and aviation fields because of its excellent high temperature strength, high recrystallization temperature and good thermal conductivity. It can be used as nozzle material, nozzle material, valve body, gas pipe material, grid material in electron tube, and also can be used as X-ray rotating anode parts, die-casting mold and extrusion mold, heating element and heat insulation screen in high temperature furnace, etc.
MHC is a particle - reinforced Molybdenum alloys containing hafnium and carbon. Due to the uniform distribution of ultrafine carbides, the material still exhibits good heat resistance and creep resistance at the temperature of 1550℃, and the recommended maximum service temperature is 150℃ higher than that of TZM.
Molybdenum zirconium alloys, pure Molybdenum doped with a small amount of zirconia (ZrO2), can enhance the corrosion resistance and creep resistance of Molybdenum.
Molybdenum-lanthanum alloys, The addition of rare earth elements can not only increase the recrystallization temperature and creep resistance of Molybdenum at high temperature, but also significantly reduce the plastic-brittle transition temperature of Molybdenum, increase the ductility, improve the room temperature brittleness of Molybdenum and the anti-sagging ability at high temperature.
