Tungsten Diboride WB2

product information:
Name: Tungsten Diboride
Purity: ≥99.5 single phase
Particle size: D50: 5~10 microns
Melting point: 2900°C
Density: 10.77g/cm3
Properties: dark gray powder

Uses: BW2 has high melting point, high hardness, high conductivity, and high corrosion resistance and oxidation resistance to different types of media. These excellent properties make WB compounds can be widely used in wear-resistant coatings in harsh environments Layers and semiconductor films, high-temperature corrosion-resistant electrode materials, casting molds, crucibles, etc.

Tungsten Boride
Silver-white octagonal crystals.
The relative density is 10.77 and the melting point is about 2900°C.
Insoluble in water, soluble in aqua regia.
It is prepared by heating boron and tungsten powder to a high temperature.
Tungsten boride has comprehensive properties such as high melting point, high hardness and chemical stability. It is not only an emerging superhard material, but also has high toughness and is an important bulletproof material in the military. Tungsten boride has a rich phase diagram, and the structure of different phases is also ever-changing. For more than 50 years, it is believed that the highest boride of tungsten is WB4, which has a three-dimensional grid structure of boron atoms. We combined first-principles calculations with thermodynamic stability, and systematically studied the thermodynamic stability and mechanical properties of possible structural phases of tungsten carbide system:
The highest boride to identify tungsten should be WB3 composed of two-dimensional plane boron atoms, not WB4 composed of three-dimensional boron atom grids. It is found that the shear modulus in the boride system of tungsten increases with the decrease of its formation energy, revealing that the mechanical properties are closely related to their thermodynamic stability.
Because of its unique mechanical, electrical and magnetic properties, tungsten diboride has attracted great attention in the field of basic research and application technology of materials science. Due to the low free diffusion coefficient of WB2, at present, the synthesis of dense tungsten diboride is mostly achieved by sintering technology under high temperature and high pressure conditions. In this way, the cost is too high; on the other hand, because B is at high temperature Will volatilize.
Therefore, it is difficult to grasp the content of boron to prepare WB2 bulk materials directly from tungsten powder and boron powder.
It may also generate low borides (such as W2B) during the sintering process, and a dense bulk material with WB2 as the main phase cannot be obtained.
Application areas:
Wear-resistant coating and semiconductor film for wear-resistant parts