| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-coated cutting tool having a hard coating layer exhibiting excellent wear resistance in high speed heavy cutting. SOLUTION: The surface-coated cutting tool is obtained by depositing a Ti compound layer (a) as a lower layer, anαtype Al<SB>2</SB>O<SB>3</SB>layer (b) containing Zr, as an intermediate layer, and anαtype Al<SB>2</SB>O<SB>3</SB>layer (c) as an upper layer, onto a surface of a tool substrate. Each of the (b) and (c) layers has a planar polygonal shaped (inclusive of a flat hexagonal shape) and long shaped crystal grain structure. The interior of each crystal grain having a predetermined area ratio in each layer is divided by crystal lattice interfaces comprising at least one constituent atom covalent lattice point represented byΣ3. COPYRIGHT: (C)2010,JPO&INPIT
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