| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-coated tool with high wear and chipping resistance. SOLUTION: In this surface-coated tool, the surface of a substrate is covered with a covering layer 1 made of Ti<SB>1-a-b</SB>A1<SB>a</SB>M<SB>b</SB>(C<SB>x</SB>N<SB>1-x</SB>) (M includes one or more elements selected from group 4, 5, 6 elements in the periodic table, rare earth elements, and Si, excluding Ti. Herein, 0.4≤a≤0.65, 0≤b≤0.3, and 0≤x≤1). The covering layer 1 has a structure composed mainly of column crystals 2 vertically extended relative to the surface of the substrate 10. Granular crystals 3 are dispersed inside, and sector crystals 4 with their one end extended in a sector form are grown in the upper side. Resistance to cracks in the covering layer is enhanced. As a result, the chipping resistance is improved. COPYRIGHT: (C)2008,JPO&INPIT
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