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Ti(C,N)-based cermets have been used as cutting tools due to their excellent hardness, phase stability, and wear resistance. These properties make the cermets possible for high-temperature machining. 1 In addition, Ti(C,N)-based cermets show higher hardness, lower friction coefficient compared with the cemented carbide, superior toughness than the ceramics, and more cost-effective than the PCBN. Ti(C,N)-cermet cutting tools are now mainly used for semifinishing and finishing and high-speed cutting of stainless steels or carbon steels.Currently, many efforts have been made to improve the properties of materials by means of deposition of coatings. 2 Deposition of a hard and wear-resistant film on the surface of the cutting tools has been proven to be an effective way to enhance the cutting performance. Today, physical vapor deposition (PVD) and chemical vapor deposition (CVD)

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