| 摘要 |
PROBLEM TO BE SOLVED: To provide a diamond-coated tool that has little initial stage cutting resistance and exhibits an excellent wear resistance. SOLUTION: The diamond-coated tool is coated with a diamond coating on the surface of a tool base which is composed of a WC-based cemented carbide or TiCN-based cermet. The diamond coating has a film structure in which oriented diamond crystal grains with an average crystal grain diameter of 0.2-1.5μm are dispersedly distributed in the matrix of non-oriented diamond crystal grains at 30-80 area% by mean area ratio. When viewed along the thickness direction of the diamond coating, the crystal grain diameter and the area ratio of the oriented diamond crystal grains gradually become smaller in value toward the front surface side. Furthermore, in at least either one of the (110) plane or (111) plane of the crystal grains of the diamond coating, the highest peak exists in an inclination angle section within the range of 0-10°in an inclination angle frequency distribution graph against a normal of the surface of the tool base and the total of the frequencies present within the range of 0-10°accounts for 30-60% of the overall frequency. COPYRIGHT: (C)2010,JPO&INPIT
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