High temperature components
Due to its high purity, high temperature resistance and low vapor pressure, molybdenum is often used to make heater and structural material of high temperature furnace. In the production process of tungsten, molybdenum and cemented carbide, the reduction furnace and sintering furnace are mostly made by molybdenum wire heating. Some iron products are continuously sintered, and the molybdenum rod heating row is used as the heating body. The molybdenum rod heating row is hung on both sides of the furnace by molybdenum hook. This kind of furnace is generally in reducing atmosphere or non oxidizing atmosphere. In hydrogen and decomposed ammonia, molybdenum wire can be used close to melting point, and in nitrogen, it can be used up to 2000 ℃. When used above 1700 ℃, TZM alloy or MoLa alloy with higher recrystallization temperature and better strength can be used as heat generator. Molybdenum has good ablation resistance in fused quartz. It is used as an electrified melting electrode in glass industry. The loss of molybdenum electrode is only 7.8 g per ton of glass produced, and its service life can be as long as more than one year. In addition to being used as electrode, molybdenum is also used as high temperature structural material for glass melting, such as guide channel, tube, crucible, flow port and stirring rod for rare earth smelting. Using molybdenum instead of platinum in glass fiber drawing furnace has a good effect and greatly reduces the production cost. The newly developed sintering furnace for nuclear fuel is heated by molybdenum mesh. The three-phase mesh heater is woven with 0.8mm molybdenum wire. The working temperature can reach 1800-2000 ℃. In addition, molybdenum and its alloys can also be used as hot isostatic pressing furnace frame, heat shield, sintering and steaming coating material boat, SmCo magnet and uranium dioxide sintering pad, thermocouple and its protective sleeve, etc.
