Tungsten wire alloyed with molybdenum to improve the heat resistance strength. The incorporation of 25% ~ 30% W, the alloy to improve the working temperature of about 200 ℃. Mo-W alloy can only be produced in the form parts, but can not produce boards and wire. Mo-W alloy is slightly higher than the pure molybdenum recrystallization temperature. It has excellent resistance to molten zinc corrosion resistance, so its main application is in the zinc industry, for example for automatic molding machinery pump member, casting valve, siphon, and nozzles.
Four. Mo-Re alloys
Although rhenium scarce and expensive, but has a unique heating temperature, high plasticity overall performance, so that not only the application in the electronics industry, usually Mo-5Re and Mo-41Re do thermocouple wire and for structural materials in aerospace, Mo-50Re for high temperature structural materials.
Five. MH and KW molybdenum alloy
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, 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 crucible 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.
The strength properties, the doped molybdenum in high temperature conditions show a great deal of advantages. Although below 1000 ℃, TZM and the intensity is higher than pure molybdenum doped molybdenum. This shows that the higher the temperature, the more effective to enhance the bubble.
Because of the above-doped molybdenum superiority to produce some typical applications, such as automotive and motorcycle headlights in plastic supporting wire, tubes and furnace heating elements, sintering and annealing used boat and so on.
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.
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