| 摘要 |
A new and improved coated cemented carbide includes a cemented carbide substrate, an interlayer disposed on the substrate, and a coating of hafnium carbonitride and/or zirconium carbonitride which is firmly and adherently bonded to the substrate and interlayer, the coating having a specific carbon-to-nitrogen ration. Where the coating is hafnium carbonitride the interlayer is be selected from the group consisting of hafnium nitride, titanium nitride, zirconium nitride and a titanium nitride - titanium carbide combination, the titanium nitride - titanium carbide combination consisting of a first layer of titanium nitride and a second layer of titanium carbide overlying the layer of titanium nitride. Where the coating is zirconium carbonitride the interlayer is selected from the group of zirconium nitride, titanium carbide and hafnium carbide.
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