Tungsten Boride Synthesis at High Temperature and High Pressure

Tungsten boride compounds play a very important role in modern industry. They have high melting point, high hardness, wear resistance, high temperature resistance, corrosion resistance and excellent electrical conductivity. They are widely used in high temperature structural materials, refractories, electrode materials, structural materials, wear resistant materials and other fields. With the progress of science and technology, the application fields of B-W series compounds are still in progress. It will be further expanded to show more uses.

Tungsten boride can be synthesized under high temperature and high pressure, which can greatly shorten the synthesis process, achieve the goal of high efficiency and energy saving. The synthesized tungsten boride powder has uniform particle size, complete crystallization and stronger market competitiveness. Its main processes include:

The first step is to put boron powder and tungsten powder with B/W molar ratio of N in mixing tank and take them out after fully mixing for 2-24 hours. The molar ratio of boron powder is 0.5 < n < 4, and the molar ratio of tungsten powder is 0.5 < n < 4.

The second step is to place the boron powder and tungsten powder in the graphite crucible coated with BN powder on the inner wall. Then the crucible and the powder are put together in the high temperature and pressure vessel. The pressure is set to 0.5-20 GPa. Then the temperature rises to 800-2000 ℃ at the rate of 0.5-30 ℃/min, and the temperature is kept for 0.5-8 H.

The third step following up, the synthesized powder was crushed and screened to obtain tungsten boride powder with B/W molar ratio of n.

Compared with other methods, tungsten boride produced by high temperature and high pressure synthesis method has more extensive uses and stronger market competitiveness. Its main characteristics are high purity, low cost and uniform particle size. It can be used in wear-resistant steel, coating materials, cemented carbide, target materials, crucibles and functional materials.

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