Tungsten Crucible Chemical Properties
Tungsten crucible is one of the metal tungsten products. They are mainly divided into sintering molding(techniques of powder metallurgy technique) , stamping molding, spinning type. They are made of Wu Rod turning processing molding and welding forming.
Wu Crucible can be used in below 2400℃ and vacuum of inert gas. Wu has high melting point, good high temperature strength, good abrasion resistance to corrosion, and high thermal conductivity, low thermal expansion coefficient, and good hardenability. Tungsten crucible is widely used in rare earth smelting, quartz glass, electronic spray, crystal growth, etc.
Tungsten crucible chemical properties
Tungsten is a rare high melting point metal, and can improve the high temperature hardness of steel, belongs to the periodic table 6 cycles Ⅵ group B (2) for a long period of time.Tungsten is a silvery white metal, and the shape of steel.Tungsten high melting point, low vapor pressure, evaporation rate is lesser also.Chemical properties of tungsten is stable, with air and water at room temperature without reaction, when heated, not any concentration of hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid and aqua regia to tungsten doesn't work, when the temperature rose to 80 °, 100 ° C, the various kinds of acid, except hydrofluoric acid, and other weak acid in tungsten.Under normal temperature, tungsten can be quickly dissolved in hydrofluoric acid and nitric acid in mixed acid, but in alkali solution doesn't work.With the presence of air, molten alkali can tungsten oxide into tungstate, with oxidant (NaNO3, NaNO2, KClO3, PbO2) under the condition of existence, generate tungstate more violent reaction.Under high temperature to chlorine, bromine, iodine, carbon, nitrogen, sulfur and other chemical combination, but not with hydrogen.
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