The advantages of molybdenum boats
Molybdenum boats are different mechanical strength, refractoriness and corrosion resistance. In an aggressive liquid or gaseous media they don’t collapse and have a high elastic modulus and low coefficient of thermal expansion. These advantages allow the use of molybdenum boats in the most critical and complex technological production conditions. Molybdenum boats compared with tungsten easier almost doubled, so molybdenum products have high specific strength (at a temperature of not more than 1370 °C).
|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|
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.
Practically the only disadvantage is the high cost of molybdenum boats as molybdenum 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.
Boats made of molybdenum plates high quality (MCIT, MCH) way bending, riveting or by powder pressing with subsequent machining. This technology ensures high operational reliability and heat resistance. They can be manufactured in various shapes and sizes.
Molybdenum boats are widely used in electrical engineering, in the manufacture of ceramics in installations with high temperatures in vacuum or hydrogen atmosphere for annealing and sintering of powder products from metals and nonmetals, growing single crystals, recovery of oxides of metals, melting glass, etc.
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