| 摘要 |
A cutting tool whose surface is coated with a composite hard layer formed by chemical vapor deposition and having excellent wear resistance and chipping resistance. The cutting tool contains a substrate whose surface is coated with a composite hard layer containing an inner layer including one or more layers of titanium carbide, titanium nitride, titanium carbonitride, titanium carboxide, and titanium oxicarbonitride, and an outer layer including at least one alumina layer. The alumina layer contains K-type alumina such that an X-ray intensity ratio IA/IB of two specific crystal faces A and B in X-ray diffraction is not smaller than 2, where the A-face and B-face denote faces of K-type alumina defined as those whose interfacial distances are 2.79 ANGSTROM and 2.57 ANGSTROM in ASTM4-0878, and IA and IB denote X-ray intensity of the faces A and B in X-ray diffraction.
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