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cubic boron nitride (Cubic Boron Nitride， abbreviation CBN)it's boron nitride (BN)one of the allotropes of diamond, its crystal structure is similar to diamond, and its hardness is slightly lower than diamond, but much higher than other tool materials. it and diamond are collectively called superhard tool materials and are often used as abrasives and tool materials.

so far, cubic boron nitride is mainly obtained through artificial synthesis, with single crystals (CBN)with polycrystalline (that is polycrystalline cubic boron nitride, referred to as PCBN)divided.

single crystal cubic boron nitride is made of cubic boron nitride as raw material, and a catalyst is added at 4 ~8GPa high pressure, 1400 ~1800℃converted under high temperature conditions. due to CBN due to the limitations of manufacturing technology, it is still difficult to manufacture large-grain single crystals directly used in cutting tools, and the cost is very high. in addition, single crystals CBN there are "cleavage surfaces" that are easy to split and cannot be directly used to make cutting tools, so CBN single crystal is mainly used to make abrasives and grinding tools. at present, the cubic boron nitride material that can be used in cutting tools in industry is mainly polycrystalline cubic boron nitride. (PCBN)knives.

polycrystalline cubic boron nitride (PCBN)under high temperature and high pressure conditions, fine particles CBN material through binder (Al、Ti、TiC、TiN wait )a polycrystalline material formed by sintering. PCBN overcame CBN single crystals have shortcomings such as their ease of understanding and anisotropy, making them ideal for making tools such as knives.

although the hardness of cubic boron nitride is slightly lower than diamond, it is much higher than other high-hardness materials. the following table shows the performance comparison between cubic boron nitride and diamond. the outstanding advantage of cubic boron nitride is that its thermal stability is much higher than that of diamond, up to 1200 ℃above (diamond is 700 ~800℃)，another outstanding advantage is that it is chemically inert, and with iron at 1200 ~1300℃there is no chemical reaction.