Ceramic tool materials with the composition of the structure and the continuous improvement process, in particular the progress of nano-technology, making the ceramic tool toughening possible, in the near future, ceramics may follow the high-speed steel, carbide after cutting The third revolution. Ceramic tool has the advantages of high hardness (HRA91 ~ 95), high strength (flexural strength of 750 ~ 1000MPa), good abrasion resistance, good chemical stability, good anti-adhesion performance, low friction coefficient and low price. Not only that, ceramic tool also has a high temperature hardness, 1200 ° C hardness reached HRA80. In normal cutting, the durability of ceramic cutting tools is extremely high, the cutting speed can be increased by 2 to 5 times than that of cemented carbide, especially suitable for high hardness material processing, finishing and high speed machining. The cutting hardness is up to HRC65 and hardened cast iron Wait. Commonly used are: alumina-based ceramics, silicon nitride-based ceramics, metal ceramics and whisker toughening ceramics.