Advantages of molybdenum boats
Molybdenum boat differs in mechanical strength, тугоплавкостью, corrosion resistance in aggressive liquid and gaseous media. Molybdenum boat has a high modulus of elasticity and low coefficient of thermal expansion. Such advantages can molybdenum boats in the most demanding and complex technological production conditions. Molybdenum boats almost doubled compared to tungsten, so that the products made of molybdenum have a greater specific strength (up to a temperature of +1370 ° C).
Molybdenum boat reacts with hydrochloric acid, with sulfuric acid only at a temperature of 80-100 ° C nitric acid, aqua regia dissolves molybdenum only at a temperature of 100 ° C. In cold alkaline solutions of molybdenum boot is stable, but in hot alkaline solutions molybdenum is slowly destroyed. Impurities of carbon, oxygen, silicon, aluminum, nitrogen, iron, sulfur and calcium, phosphorus, which in the technical molebene in hundredths or thousandths of a fraction of a percent, significantly affect the properties of molybdenum. Most of these impurities make molybdenum more fragile. The most harmful of all contaminants is oxygen. If it contains 0.0008-0.004% by volume, low-melting oxides lead to a drastic increase in its fragility and a reduction in its plastic deformation properties, especially in the presence of carbon and nitrogen. With an increasing percentage of oxygen of more than 0.015% molybdenum, pressure is not processed and becomes brittle.
Almost the only downside is the high cost of molybdenum boats, since molybdenum is a metal, is related to the elements, rare earth metals and it in its pure form is quite heavy. In addition, it is тугоплавок and difficult to treat.
Molybdenum boat is made of high quality molybdenum plates (МЧВП, MCH) way of arch, rivets or powder by pressing with subsequent mechanical processing. This technology ensures high operational reliability and heat resistance. They can be made in different shapes and sizes.
Molybdenum boat is widely used in electrical engineering, in the production of ceramics in high-temperature plants with a vacuum or hydrogen atmosphere for the annealing and sintering of powdered products from non-metals and metals, the growth of single crystals, the restoration of oxides of metals, and melting of glass, etc.