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The Preparation And Application of Tungsten Carbide Powder

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Tungsten carbide

A compound made of carbon and both tungsten, it has a molecular form of WC. The molecular weight is 195.85. Tungsten carbid is a black hexagonal crystal, with a metallic luster similar to that of diamond. It conducts electricity well. Tungsten carbide can’t be dissolve in water or hydrochloric and sulfuric acids. However, it is easily soluble and can be broken down in hydrofluoric and nitric acids. Tungsten carbide in its pure form is very fragile. However, a tiny amount of titanium or cobalt can reduce the fragility.

Tungsten Carbide

Utilizing metal tungsten or carbon as raw material, tungsten powder of an average particle size between 3 and 5 mm, and carbon black with the same quantity, are dried mixed and press molded. Then it is placed in a graphite resist furnace. Or, you can heat it to 14001700 using an induction electric furnace. Preferably 15501650. W2C is produced in the hydrogen stream. The reaction continues at high temperature to create WC. To make tungsten carbide, first tungstenhexacarbonyl must be thermally broken down in a CO atmosphere between 650 to 1000 degC. W2C is possible at higher temperatures than these.

Hydrogenated tungsten trioxide (WO3) is then reduced to make tungsten dust. The average particle size for tungsten is 35mm. Next, the mixture (containing tungsten powder and carbon) in an equal ratio is dried-blended using a ballmill for approximately 10 hours. Then it’s pressure-formed under 1t/cm2. Place the block of pressurized material in a graphite tray or crucible. Then heat it up to 14001700, or 15501650 if you use a graphite resistance or induction furnace. Carburizing will create tungsten carbide.

Since W2C can be generated from the beginning of the reactions, the reaction begins around the tungsten particle. Because the reaction is incompleto (mainly due to the low reaction temperature), the unreacted and intermediate W2C, as well as WC (tungsten carbide) remain. The reaction must then be heated to the high temperatures mentioned above. The raw tungsten particle size should determine the maximum temperature. A reaction can be initiated at temperatures between 1550-1650°C for large particles that have an average size of 150 mm.

Tungsten Carbide

Tungsten caride is used extensively in high-speed, fast cutting tools, furnace structural material, jet engine components, cermet materials and resistance heating element.

Tungsten carbid is used in the manufacture of cutting tools and wear-resistant parts. It also melts crucibles for various metals, such as cobalt, copper and bismuth.

Tungsten carbide is used for super-hard material as well as wear resistance. This can be combined with other carbides into a stable solution. WC-TiC-Co-cemented carbide tools are well-known. It is also possible to use as a modification of NbC–C or TaC–C Ternary System Carbidides. This will reduce the sintering temp and ensure excellent performance. It is also suitable for aerospace applications.

Tungsten carbide (WC) is made by combining tungsten anhydride, (WO3), and graphite at high temperatures of 1400-1600. You can make dense ceramic products by either hot pressing or hot isostatically pressing sintering.

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