The Preparation And Application of Tungsten Carbide Powder

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 crystal that has a metallic luster. Its hardness and durability are similar to those of diamond. It is also a good heat conductor and conductor for electricity. 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, it can be made less brittle.

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 hydrogenated and then reduced to form tungsten (average particle size of 35mm). Press-forming is done by applying pressures of approximately 1t/cm2 to a mixture of carbon black and tungsten trioxide in an equimolar proportion (dry-blended for 10 hours with a mill). Pressurized material blocks can be placed into a crucible or graphite block and heated in a hydrogen stream using pure hydrogen (with a dewpoint of -35), or induction electric heaters. This will result in the production of tungsten carburide.

As the reaction is incomplete due to low temperature (mostly), the unreacted W (tungsten) and intermediate W2C (tungsten carbide) 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 materials for jet engines, cermet material, resistance heating components, etc.

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 able to form solid solutions with a wide range of carbides. WC-TiC-Co cement carbide tools were widely used. It can also reduce the sintering temp and maintain good 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 atmospheric at temperatures between 14001600. By hot pressing sintering, or hot isostatic sintering, dense ceramic products can also be achieved.

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