The Preparation And Application of Tungsten Carbide Powder

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Tungsten carbide It is composed of carbon and tungsten. The molecular formula for this compound is WC, and the molecular weight is 195.85. Tungsten carbide is a hexagonal black crystal that has a metallic luster. Its hardness and durability are similar to those of diamond. It is also a good heat conductor and a good electrical conductor. Tungsten carbide is not soluble with water, hydrochloric, or sulfuric acid. However, it can be dissolved in a mix of nitric and hydrofluoric acids. Pure tungsten carbide is fragile. By adding titanium, cobalt or other metals, this fragility can be reduced.

Tungsten Carbide Preparation

The tungsten is mixed in a ball-mill with carbon black and the tungsten has been pressed into a plate. It can also be heated up to 14001700 degrees in an induction oven. In the hydrogen flow, initially W2C is produced. The reaction continues at high temperature, producing WC. Or, tungsten is first thermally decomposed under a CO atmosphere between 650 and 1000degC, to yield tungsten, which is then heated to 1150degC with carbon monoxide, to yield tungsten carburide. W2C is produced by temperatures above this point.
Tungsten trioxide, WO3, is reduced by hydrogenation and prepared as tungsten (average particle size of 35mm). Press-forming is done by applying pressures of approximately 1t/cm2 to a mixture of tungsten trioxide WO3 and carbon-black in an equimolar proportion (dry-blended for about 10 hours with a Ball Mill). Carburizing tungsten carbide is achieved by placing the pressurized material into a graphite crucible and heating it in a hydrogen stream. (Use pure hydrogen that has a dewpoint below -35 degrees Celsius)

As the reaction is incomplete due to low temperature (and mainly unreacted tungsten), intermediate W2C and unreacted tungsten remain. The tungsten must be heated at the temperature above. The maximum temperature must be determined by the particle size. For coarse particles, with an average particle diameter of approximately 150 mm the reaction takes place at a temperature between 1550 and 1650degC.

Tungsten Carbide Application

Tungsten carbide is used in many applications, including high-speed cutters, furnace structural material, jet engine parts and resistance heating components.

Tungsten carbide is used in the manufacture of cutting tools, wear-resistant components, melting crucibles (for metals like copper, cobalt, or bismuth), and wear-resistant semi-conductor films.

Tungsten carbide is used for super-hard material, and also as wear-resistant material. It is a solid solution that can be formed with many different carbides. WC-TiC-Co bonded carbide tools were widely used. It can also reduce the sintering temp and maintain excellent performance when used as an additive to NbC C and TaC C ternary system carburides. It can also be used for aerospace materials.

Tungsten carbide is produced by combining tungsten anhydride with graphite under a reducing environment at high temperatures of 14001600. By hot pressing sintering, or hot isostatic sintering, dense ceramic products can also be achieved.

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