Description of Tungsten carbide
Tungsten carbide has comprehensive properties such as high melting point, high hardness and chemical stability. It is not only an emerging super-hard material but also has high toughness. It is an important bulletproof material in the military. Tungsten boride has a rich phase diagram, and the structures of different phases are also ever-changing. For more than 50 years, it has been believed that the highest tungsten boride is WB4, which has a three-dimensional boron atomic grid structure. We combined first-principles calculations with thermodynamic stability to systematically study the thermodynamic stability and mechanical properties of possible structural phases of the tungsten carbide system:
The highest boride to identify tungsten is supposed to be WB3, which is composed of two-dimensional planar boron atoms, not WB4, which is composed of a three-dimensional three-dimensional boron atom grid.
It was found that the shear modulus in tungsten boride systems increases as its formation energy decreases, revealing that the mechanical properties are closely related to their thermodynamic stability.
Instances of tungsten boride applications are as complies with:
1) Prepare a workpiece with a boron-rich tungsten finish, including a work surface substratum, and a tungsten layer, a tungsten boride slope layer and a boron-rich tungsten finish sequentially organized on the workpiece substrate; along the workpiece substratum The boron web content in the tungsten boride gradient layer progressively enhances toward the density instructions of the tungsten layer; the crystal grains in the boron-rich tungsten boride finishing are WBy, where y is a worth of 2.5-4. The special covering structure of the here and now development can make the bonding strength in between each layer high, and the elastic modulus and thermal development coefficient in between each layer change in a gradient from the base to the top movie, minimizing the tension of the whole covering to zero., boost the toughness and bonding strength of boron-rich tungsten covering. The development likewise provides an approach for preparing the work surface with the boron-rich tungsten finishing.
2) Prepare a tungsten diboride difficult material. This method initially utilizes a mechanochemical approach to manufacture tungsten diboride powder at space temperature utilizing high-purity tungsten (W) powder and boron (B) powder as resources, and after that synthesizes it under argon Under a gas safety atmosphere, high-temperature sintering is made use of to densify the synthesized powder to produce tungsten diboride bulk material. This method can obtain thick tungsten diboride bulk product through sintering under typical temperature and pressure conditions. The tungsten diboride mass material prepared by the creation has a collection of exceptional homes such as certain hardness, great stability and great neutron absorption impact. The tungsten diboride product prepared by the innovation is widely used in fields such as corrosion-resistant materials, reducing devices, and new securing materials.
- Prepare a work surface with a tungsten boride-rich coating, consisting of a work surface substrate, and a tungsten layer, a tungsten boride gradient layer and a boron-rich tungsten layer sequentially prepared on the workpiece substrate; along the work surface substrate The boron web content in the tungsten boride slope layer gradually boosts towards the thickness instructions of the tungsten layer; the crystal grains in the boron-rich tungsten boride finishing are WBy, where y is a value of 2.5-4. The distinct finishing structure in this utility model can make the bonding stamina in between each layer high, and the elastic modulus and thermal expansion coefficient between each layer adjustment in a gradient from the base body to the leading film, minimizing the anxiety of the general finishing to a fad. To absolutely no, enhance the durability and bonding stamina of boron-rich tungsten finishing.
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