The molybdenum crucible
Molybdenum crucibles have significant mechanical strength and heat resistance, corrosion resistance in the most aggressive environments. Qualities, molybdenum remarkable small coefficient of thermal expansion and high modulus of elasticity, which gives the opportunity to use them for very critical products. Molybdenum in comparison to tungsten easier almost doubled, so molybdenum products have high specific strength (at a temperature of not more than 1370 °C).
Molybdenum reacts with hydrochloric, sulfuric acids only at the temperature. 80−100°C. Nitric acid, Aqua Regia dissolved molybdenum only when температуре100°C. In cold alkaline solutions it is stable, but in hot alkaline solutions the molybdenum slowly being destroyed. Impurities of carbon, oxygen, silicon, aluminum, nitrogen, iron, sulfur and calcium, phosphorus, contained in the technical molybdenum in hundredths or thousandth fractions of a percent, significantly affect the properties of molybdenum. The bulk of these impurities makes molybdenum more fragile. Most harmful of all impurities is oxygen. If it is contained in a volume 0,0008−0,004%, the low-melting oxides can lead to a sharp increase in its brittleness and a decrease in properties to plastic deformation, especially in the simultaneous presence of carbon with nitrogen. With increasing percentage of oxygen than 0.015% molybdenum is not handled the pressure and becomes brittle.
|The temperature at which the obtained data the features of t°C||20°C|
|The linear thermal expansion coefficient α [1/°C]||Of 4.9x10-6|
|The melting temperature t°C||2620°C|
|Specific heat at 20 °C [kJ/(kg·deg)]||0,256|
|The thermal conductivity K [W/(m·K)]||142|
|Electrical resistivity R, Mhmm2/m||0,054|
Practically the only disadvantage is the high cost of molybdenum crucibles, since Mo is a metal belonging to rare earth elements and in its pure form is quite difficult to identify. Besides, he is refractory and hard to work.
Molybdenum crucible is made from molybdenum high-quality steel hot-rolled plates MCH, MCIT by machining and pressing.
Molybdenum crucible is used for smelting of rare earth metals as a heat-resistant container for the needs of metallurgy and engineering, as well as for annealing and sintering powdered raw materials (metals and nonmetals) in the reducing atmosphere.
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