Polycrystalline diamond is a kind of polycrystalline material sintered by cobalt and other metal binders under high temperature and pressure. Although the hardness of polycrystalline diamond is slightly lower than that of single crystal diamond, its grains are disorderly arranged, and show the isotropic and cleavage-free surface.
The reason for the high hardness of diamond is that it has a "diamond structure". The so-called "diamond structure" means that in diamond crystals, four valence electrons of carbon atoms are bonded in a tetrahedral structure, and each carbon atom forms a covalent bond with four adjacent atoms. This structure has strong directivity and cohesion. Polycrystalline diamonds are sintered from fine diamonds with different orientations and adhesives. Because of this, polycrystalline diamond is polytropic. Although its wear resistance and hardness are not as good as single crystal diamond, it is more difficult for polycrystalline diamond to crack along a single cleavage plane than single crystal diamond. At the same time, polycrystalline diamond has hardness and wear resistance second only to single crystal diamond. Polycrystalline diamond suppliers are also seizing its characteristics of high quality and making it widely into polycrystalline diamond tools.
Polycrystalline diamond cutter has low friction coefficient, excellent thermal conductivity and low expansion coefficient. Its hardness is 2-4 times that of cemented carbide, and its tool life is more than 10 times that of cemented carbide. And the price of raw materials used in polycrystalline diamond is dozens of times lower than that of natural diamond, which is undoubtedly a compliment to polycrystalline diamond suppliers. Polycrystalline diamond composite tool is based on cemented carbide, which has good weldability, compatibility with polycrystalline diamond, good toughness and hardness. Therefore, polycrystalline diamond has not only the hardness of diamond, but also the toughness and weldability of cemented carbide.
Eagle is an absolutely reliable polycrystalline diamond supplier. Welcome to choose and buy it!