Common crystal phase structures of cemented carbide include carbide phases such as tungsten carbide (WC) and titanium carbide (TiC), and metallic cobalt (Co) phase. Among them, tungsten carbide is the most important hard phase. It has the characteristics of high hardness, high melting point and good wear resistance. It is the main component of cemented carbide. Titanium carbide is a common hard phase with high hardness, high melting point, and good wear resistance and corrosion resistance. The metallic cobalt phase is a binder and alloy agent with high density, high strength and good plasticity.
The properties of cemented carbide mainly include the following aspects:
1. Hardness: The hardness of cemented carbide is affected by the carbide content and particle size. In general, the higher the carbide content, the higher the hardness. Both titanium carbide and tungsten carbide have higher hardness, but titanium carbide is slightly harder than tungsten carbide.
2. Wear resistance: The wear resistance of cemented carbide mainly depends on the type and particle size of carbides, as well as the composition and preparation process of the alloy. Titanium carbide has better wear resistance than tungsten carbide, but tungsten carbide is cheaper and more common.
3. Red hardness: Red hardness refers to the ability of cemented carbide to maintain high hardness at high temperatures. Both tungsten carbide and titanium carbide have good red hardness and can maintain high hardness at higher temperatures.
4. Corrosion resistance: The corrosion resistance of cemented carbide depends on the type and composition of carbides, as well as the preparation process of the alloy. Generally speaking, titanium carbide resists corrosion better than tungsten carbide, but tungsten carbide is cheaper and more common.
5. Brittleness: Carbide is highly brittle and has poor impact resistance, so care must be taken to avoid impact or impact during use.
6. Density and specific gravity: The density of cemented carbide is relatively high, generally between 14 and 16g/cm³, of which the density of tungsten carbide is 14.7g/cm³ and that of metallic cobalt is 8.9g/cm³. Therefore, the specific gravity of cemented carbide is greater than that of ordinary metal materials.
7. Electrical properties: Carbide has high resistivity and good insulation properties. At the same time, the magnetic permeability of cemented carbide is low and it is not ferromagnetic.
8. Thermal properties: The thermal conductivity of cemented carbide is low and it is not easy to transfer heat, so it has good thermal insulation properties. At the same time, cemented carbide has a higher melting point and is not easy to melt at high temperatures.
In general, cemented carbide has the characteristics of high hardness, high wear resistance, good red hardness and corrosion resistance, but it is relatively brittle, so care must be taken to avoid impact or impact during use. In addition, the specific gravity of cemented carbide is greater than that of ordinary metal materials, and it has good insulation and heat insulation properties.
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