Tungsten carbide powder (WC) is the main raw material for the production of cemented carbide, chemical formula WC. The full name is Wolfram Carbide. Tungsten carbide powder is a black hexagonal crystal with metallic luster, hardness similar to diamond, and a good conductor of electricity and heat. The melting point is 2870 ° C, the boiling point is 6000 ° C, and the relative density is 15.63 (18 ° C). Tungsten carbide is insoluble in water, hydrochloric acid and sulfuric acid, and easily soluble in a mixed acid of nitric acid and hydrofluoric acid. Pure tungsten carbide is fragile. If it is mixed with a small amount of titanium, cobalt and other metals, it can reduce brittleness. Tungsten carbide, which is used as a cutting tool for steel, is often added with titanium carbide, tantalum carbide, or a mixture thereof to improve the explosion resistance. Tungsten carbide is chemically stable.

Properties of tungsten carbide powder

Tungsten carbide powder is a dark gray powder, which can be dissolved in a variety of carbides, especially in titanium carbide, which has a high solubility, forming a TiC-WC solid solution. Another compound of tungsten and carbon is tungsten carbide, chemical formula is W2C, melting point is 2860 ℃, boiling point is 6000 ℃, relative density is 17.15. Its properties, manufacturing methods and uses are the same as tungsten carbide powder.
Use of tungsten carbide powder

Tungsten carbide powder is mainly used in the production of cemented carbide. In tungsten carbide powder, carbon atoms are embedded in the interstitial spaces of the tungsten metal lattice, without damaging the original metal's lattice, forming interstitial solid solutions, so they are also called interstitial (or intercalation) compounds. Tungsten carbide can be made from a mixture of tungsten and carbon

Tungsten carbide powder production method

Tungsten carbide can be prepared by heating a mixture of tungsten and carbon at high temperature. The presence of hydrogen or hydrocarbon can accelerate the reaction. If tungsten is used for the preparation of oxygen-containing compounds, the product must finally be vacuum-treated at 1500 ° C to remove the carbon oxides.

Tungsten powder carbonization method hydrogenates tungsten trioxide to obtain tungsten powder (average particle size: 3 to 5 μm). Then the tungsten powder and carbon black are mixed in an equimolar ratio (dry-mixed with a ball mill for about 10 hours), and pressure-molded under a pressure of about 101.325 Mpa. The pressure-molded powder is put into a graphite plate or crucible, and heated to 1550-1650 ° C in a hydrogen flow (using pure hydrogen with a dew point of -35 ° C) in a graphite resistance furnace or an induction electric furnace to carburize it to produce Finished tungsten carbide.

W powder is one of the main raw materials for producing WC powder. The reduction of WO3 powder by H2 to make W powder is a common production method in industry. Due to the genetic relationship of powder properties, the properties of W powder are closely related to the properties of WO3 powder and its reduction process.

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