Coated high-speed steel tools, coated carbide tools, and coated tools on ceramic and superhard materials (diamond or cubic boron nitride) blades. But the former two kinds of coated tools are the most used. The coating on the ceramic and superhard material blades is a material with a lower hardness than the substrate. The purpose is to improve the fracture toughness of the blade surface (which can be increased by more than 10%), which can reduce the chipping and breakage of the blade and expand the scope of application.

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