1 pure silicon nitride ceramic cutter, its hardness HRA91～92, bending strength 700～900Mpa, fracture toughness 4.2～5.2MpaVm, heat resistance up to 1300～1400°C, its thermal expansion coefficient is 3.0×10-6/°C, Has good antioxidant properties. 2 silicon nitride composite ceramic cutter; it is a ceramic tool made by adding a composition of Al2O3, Y2O3, TiC, TiN and MgO to a silicon nitride matrix, and using a composite strengthening effect and cold pressing sintering, the performance of which is superior to that of hot pressing. Pure silicon nitride ceramic tool. For example, the addition of Al2O3 sintered ceramic tools to silicon nitride, combined with the characteristics of Al2O3 and SiN4, is higher than that of hard alloy tools and alumina ceramic tools, and the cutting edge temperature is higher than 1000 °C. Its biggest advantage is to increase the cutting speed, increase the feed rate, increase the metal removal rate and extend the tool life. Silicon nitride ceramic tools are particularly suitable for cutting various cast irons and superalloys, but they cannot process steels that produce long chips.

In short, with the deepening of the research and development of special ceramic materials in the world, the proportion of ceramic tools in the metal cutting and processing industry has been expanding. In recent years, due to the development requirements of the world aviation and aerospace industries, it is necessary to meet the requirements for improving the cutting efficiency of workpiece materials such as Ti alloys and Ni-based superalloys, so that new special ceramic tool materials will make greater contributions.

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