By TRUNNANO | 15 January 2021 | 0 Comments
The Main Use Of Tungsten Boride
Tungsten borides are compounds of tungsten and boron. Their most remarkable property is high hardness. The Vickers hardness of WB or WB2 crystals is ~20 GPa and that of WB4 is ~30 GPa for loads exceeding 3 N.
The polycrystalline phase of the intermetallic compound tungsten boride and its phase change electrocatalytic performance for hydrogen evolution
Four stoichiometric W-B intermetallic phases W2B, WB, WB2 and WB3 were synthesized, and their hydrogen evolution electrocatalytic properties and electronic structure were compared. It was found that the electrocatalytic activity for the hydrogen evolution reaction first increased from W2B to WB2, and then decreased; then, it increased from W2B to WB2. And this activity trend can be rationalized according to the different degree of hybridization between the d orbital of W and the sp orbital of B.
The binary tungsten boride, WB, has potential industrial applications as it not only has a high melting point but is generally harder and less compressible than the pure metals. Here, the physical and mechanical properties (phase stability, bulk modulus and compressibility) of WB were investigated by in situ high-pressure x-ray diffraction and theoretical calculations. Its crystal structure still remains stable even at the highest pressure of 63.7 GPa and room temperature for the diamond-anvil cell experiments. The pressure-volume (P-V) data were fitted using the Birch-Murnaghan EOS and the Vinet EOS to obtain the isothermal bulk modulus, K0 = 452 (4) GPa and 451(3) GPa and its pressure derivative, K0′ = 4 (fixed) in the two sets of experiments with two different pressure transmitting mediums (PTMs), respectively. The excellent bulk modulus (K0) is attributed to the high valence electron density of W atom, the layered and chain-like crystal structure of WB and the strong chemical bonds formed by W and B atoms. Besides, anisotropic compression behavior of the unit-cell axes (a- and c-axes) of WB is manifested by experimental observations and theoretical calculations. This remarkably elastic pTungsten borides are compounds of tungsten and boron. Their most remarkable property is high hardness. The Vickers hardness of WB or WB2 crystals is ~20 GPa and that of WB4 is ~30 GPa for loads exceeding 3 N.
roperty is closely related to the strongly directional bonding between W and B atoms.
Resolve resolution
1. Take metal tungsten and boron as raw materials, mix and grind them thoroughly, and heat and react at 1400°C to obtain WB. Continue the reaction to generate W2B, which is cooled and crushed to obtain the product.
2. Sinter 1 mol tungsten and 1 mol boron powder at 1200～1300℃ in a real or argon atmosphere to obtain WB.
3. Use the solid phase method. Tungsten boride is prepared from metal tungsten and boron. The reaction formula is as follows.
The stoichiometric metal tungsten powder and elemental boron are fully mixed, ground, and molded, and heated at above 1400°C to react to obtain WB.
The main purpose
For wear-resistant coatings and semiconductor films of wear-resistant parts.
Nature and stability
There are two types of tungsten boride, WB and W2B. WB is black or gray hexagonal crystalline powder, relative density 15.2, lattice constant a=3115nm, c=1.693nm, melting point 2660℃, microhardness 3700kg/mm2. With metal conductivity.
The polycrystalline phase of the intermetallic compound tungsten boride and its phase change electrocatalytic performance for hydrogen evolution
Four stoichiometric W-B intermetallic phases W2B, WB, WB2 and WB3 were synthesized, and their hydrogen evolution electrocatalytic properties and electronic structure were compared. It was found that the electrocatalytic activity for the hydrogen evolution reaction first increased from W2B to WB2, and then decreased; then, it increased from W2B to WB2. And this activity trend can be rationalized according to the different degree of hybridization between the d orbital of W and the sp orbital of B.
The binary tungsten boride, WB, has potential industrial applications as it not only has a high melting point but is generally harder and less compressible than the pure metals. Here, the physical and mechanical properties (phase stability, bulk modulus and compressibility) of WB were investigated by in situ high-pressure x-ray diffraction and theoretical calculations. Its crystal structure still remains stable even at the highest pressure of 63.7 GPa and room temperature for the diamond-anvil cell experiments. The pressure-volume (P-V) data were fitted using the Birch-Murnaghan EOS and the Vinet EOS to obtain the isothermal bulk modulus, K0 = 452 (4) GPa and 451(3) GPa and its pressure derivative, K0′ = 4 (fixed) in the two sets of experiments with two different pressure transmitting mediums (PTMs), respectively. The excellent bulk modulus (K0) is attributed to the high valence electron density of W atom, the layered and chain-like crystal structure of WB and the strong chemical bonds formed by W and B atoms. Besides, anisotropic compression behavior of the unit-cell axes (a- and c-axes) of WB is manifested by experimental observations and theoretical calculations. This remarkably elastic pTungsten borides are compounds of tungsten and boron. Their most remarkable property is high hardness. The Vickers hardness of WB or WB2 crystals is ~20 GPa and that of WB4 is ~30 GPa for loads exceeding 3 N.
roperty is closely related to the strongly directional bonding between W and B atoms.
Resolve resolution
1. Take metal tungsten and boron as raw materials, mix and grind them thoroughly, and heat and react at 1400°C to obtain WB. Continue the reaction to generate W2B, which is cooled and crushed to obtain the product.
2. Sinter 1 mol tungsten and 1 mol boron powder at 1200～1300℃ in a real or argon atmosphere to obtain WB.
3. Use the solid phase method. Tungsten boride is prepared from metal tungsten and boron. The reaction formula is as follows.
The stoichiometric metal tungsten powder and elemental boron are fully mixed, ground, and molded, and heated at above 1400°C to react to obtain WB.
The main purpose
For wear-resistant coatings and semiconductor films of wear-resistant parts.
Nature and stability
There are two types of tungsten boride, WB and W2B. WB is black or gray hexagonal crystalline powder, relative density 15.2, lattice constant a=3115nm, c=1.693nm, melting point 2660℃, microhardness 3700kg/mm2. With metal conductivity.
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