1. The basic characteristics of tungsten carbide powder:
Tungsten carbide powder (WC) is the main raw material for the production of cemented carbide. Tungsten carbide is black hexagonal crystal. It has metallic luster and hardness is close to that of diamond. It is a good conductor of electricity and heat.
Tungsten carbide insoluble in water, hydrochloric acid and sulfuric acid, soluble in nitric acid - hydrofluoric acid mixed acid.
Pure tungsten carbide is fragile, if mixed with a small amount of titanium, cobalt and other metals, can reduce brittleness. Tungsten carbide, used as a steel cutting tool, is often added with titanium carbide, tantalum carbide, or a mixture of these to improve blast resistance.
Tungsten carbide has chemical stability. In tungsten carbide, the insertion of carbon atoms into the interstices of the tungsten metal lattice does not destroy the lattice of the original metal, forming a interstitial solid solution and therefore also referred to as interstitial (or intercalation) compounds. Tungsten carbide can be obtained by heating a mixture of tungsten and carbon at high temperatures, and the presence of hydrogen or hydrocarbons can speed up the reaction. If tungsten oxygenates are used, the product must eventually be vacuum treated at 1500 ° C to remove the carbon oxides. Tungsten carbide suitable for machining at high temperatures, can be made cutting tools, furnace structural materials, jet engines, gas turbines, nozzles and so on.
Tungsten carbide can dissolve in a variety of carbides, especially in the solubility of titanium carbide is very large, the formation of TiC-WC solid solution.
Tungsten carbide begins to oxidize above 500 ℃ in the air, weak in antioxidation. Tungsten Carbide (WC) powder was synthesized from tungsten oxide (WO3) and graphite at a high temperature of 1400-1600 ℃ in a reducing atmosphere. Then by hot pressing or hot isostatic pressing sintering can be made of dense ceramic products.
2. The main purpose of tungsten carbide powder:
A large number of tungsten carbide used as a high-speed cutting tool, furnace structure materials, jet engine parts, metal ceramic materials, resistance heating element.
Tungsten carbide can be used in the manufacturing of cutting tools, wear parts, copper, cobalt, bismuth and other metals melting crucible, wear-resistant semiconductor film.
Tungsten carbide can be used as super hard tool material, wear-resistant material. It forms solid solution with many carbides. WC-TiC-Co cemented carbide tools have been widely used.
As a modified additive of NbC-C and TaC-C ternary carbides, tungsten carbide can not only reduce the sintering temperature but also maintain the excellent performance, which can be used as the aerospace material.
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