Crucible made of molybdenum
Molybdenum crucible has significant mechanical strength, heat resistance, corrosion resistance in industrial aggressive environment. It possesses low coefficient of thermal expansion and high module of elasticity. These properties allow using it for essential parts of devices. Molybdenum is more lightweight than tungsten almost twice. That is why molybdenum products have a higher strength-to-density ratio (at a temperature of not ore than 1370°С).
Molybdenum reacts with salt, sulfuric acids only at a temperature of 80−100°C. Nitric, chloronitric acids dissolve molybdenum only at a temperature of 100 °C. It is resistant in cold alkali solutions, but it slowly fractures in hot alkali solutions. Additives of carbon, oxygen, silicon, aluminium, nitrogen, iron, sulfur, calcium and phosphorus that are included in commercial molybdenum significantly increase molybdenum properties. The main part of these additives makes molybdenum more brittle. The most detrimental additive is oxygen. If it constitutes 0.0008−0.004%, easy-melting oxides can lead to sharp increase of material brittleness and decrease of metal flow qualities (especially if there are present carbon and nitric). With increasing of oxygen percentage (more than 0.015%), molybdenum becomes brittle and cannot be pressure treated.
Physical properties of molybdenum
|Temperature of characteristic receiving in °С||20°С|
|Coefficient of linear thermal expansion α [1/°С]||4.9x10-6|
Specific heat at 20 °C [J/(kg/deg)]
|Heat conductivity K [V/m*K]||142|
|Specific electric resistance R Оhm-mm2/m||0.054|
Virtually the only one demerit is high self-cost of molybdenum crucible, as long as molybdenum relates to rare-earth elements and it is hardly isolated in a pure state. Besides, it is refractory and hardly processed metal.
Molybdenum crucible is made out of mechanical hot-rolled high-quality plates MCH, MCHWP by method of mechanical processing and pressing.
Molybdenum crucibles are used in melting of rare-earth metals in the capacity of heat-resistant container for needs of metallurgy and mechanical engineering. It is also used for annealing and baking of powder basic material in reducing atmosphere.
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