There is a close relationship between the crystal structure and properties of cemented carbide. Different crystal phase structures have different effects on the properties of cemented carbide.
First of all, the crystal phase structure of cemented carbide is mainly composed of tungsten carbide (WC) and metallic cobalt (Co). Among them, tungsten carbide is the main component of cemented carbide. It has high hardness, high melting point, and excellent wear resistance and corrosion resistance. Metal cobalt is used as a binder and alloying agent, which can promote the sintering and bonding of tungsten carbide and improve the hardness and strength of cemented carbide.
Secondly, the relationship between the crystal structure and properties of cemented carbide is also reflected in the following aspects:
- Lattice constant: The lattice constant of tungsten carbide is related to the cobalt content. As the cobalt content increases, the lattice constant of tungsten carbide increases. This is because the atomic radius of cobalt is larger than that of carbon, and adding cobalt will cause the lattice constant of tungsten carbide to increase.
- Density and hardness: There is a certain relationship between the density and hardness of cemented carbide. Generally speaking, the higher the density of the alloy, the higher its hardness. This is because an increase in density causes an increase in the lattice constant, thereby increasing the hardness of the cemented carbide.
- Thermal stability: When cemented carbide is used at high temperatures, it needs to have good thermal stability. Research has found that metallic cobalt can improve the thermal stability of cemented carbide, while tungsten carbide can reduce the thermal stability of cemented carbide.
- Corrosion resistance: The corrosion resistance of cemented carbide is also related to the crystal structure. Research has found that metallic cobalt can improve the corrosion resistance of cemented carbide, while tungsten carbide can reduce the corrosion resistance of cemented carbide.
- Wear resistance: The wear resistance of cemented carbide depends on factors such as the type, particle size and distribution of carbides. Generally speaking, the higher the carbide content, the finer the particle size, and the more uniform the distribution, the better the wear resistance of the cemented carbide.
In summary, there is a close relationship between the crystalline phase structure and properties of cemented carbide. Different crystal phase structures have different effects on the properties of cemented carbide. Therefore, when preparing cemented carbide, it is necessary to select the appropriate crystal phase structure according to the usage requirements to obtain the best performance.
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