Polycrystalline Diamond Material PCD:
Polycrystalline diamond is one of the many allotropes of carbon and the hardest material found in nature. According to the source of diamond, it can be divided into natural and synthetic diamonds, among which most natural diamonds are single crystal diamonds. Synthetic diamonds can be divided into single crystal, polycrystalline and CVD diamonds. Diamond as a tool material has the following characteristics: 1. Diamond has extremely high hardness and wear resistance, with a microhardness of up to 10000HV, so it has good cutting performance and long service life; 2. Diamond has a low friction coefficient, which is lower than other tool materials when rubbing against metals, generally between 0.1~0.3! The cutting edge is smooth, chips are easy to flow out during cutting, and built-up edge is not easy to generate, so the machined surface quality is high:
3. Diamond has a low thermal expansion coefficient, which is several times less than that of cemented carbide and about 1/10 of that of high-speed steel. The thermal deformation generated during cutting is small, so it is very suitable for precision machining;
4. Diamond has high thermal conductivity, whose thermal conductivity is about 1.5~9 times that of cemented carbide. The cutting heat of the tool is easy to dissipate, which reduces the cutting temperature and improves the service life of the tool.