Molybdenum carbide has a high melting point and hardness, good thermal stability and mechanical stability, and excellent corrosion resistance and other characteristics. Molybdenum is a silvery white refractory metal, a melting point of 2615 ℃, density of 10.2 g / cm 3, the expansion coefficient is small, a special tube is almost the same coefficient of expansion of the glass. Molybdenum stable at room temperature is higher than 600 ℃, rapidly oxidized.
2013年8月25日星期日
it is also used in high-power ceramic tube gate fine materials
Molybdenum, titanium-zirconium alloys commonly used in a temperature above 1100 ℃. As TZM alloy has excellent creep resistance, and therefore the best high temperature thermal processing using high-strength mold (such as casting, extrusion, isothermal forging die and punch with head) materials; also be used as a high-temperature high-pressure equipment (thermal isostatic presses and high temperature furnace) structural materials, such as heat shields, struts, etc.; it is also used in high-power ceramic tube gate fine materials; addition, you can also be used to make production of powder metallurgy products, refractories and two uranium oxide grain with burning boat. Because of its better welding performance and recrystallization at high temperature, the alloy has started the trial at the hot gas valve and a high-temperature gas sealing system.Mo in order to solve the problem of sagging generated under high temperatures, typically doped molybdenum K, Si, Al to improve its recrystallization temperature. Since processing of doping and produce intense overlapping unidirectional fibrous structure of the recrystallization temperature of pure Molybdenum plate, up to about 1400 ℃ 1800 ℃. Even when using the recrystallization temperature ductility remained doped molybdenum creep rate at 1800 ℃ lower than that of pure molybdenum, about 1000 times, not only better than pure molybdenum TZM and processing but also rare earth elements, oxides of molybdenum alloys, so use it to produce parts even at high temperatures remain dimensionally stable.
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