Surface-coated cutting tool
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United States of America Patent
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Jan 30, 2018
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app pub date -
Jul 13, 2015
filing date -
Jul 13, 2015
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Abstract
A surface-coated cutting tool according to the present invention includes a coating. The coating includes an α-Al2O3 layer. Each of the α-Al2O3 layers on a side of a rake face and a side of a flank face shows (001) orientation. In the α-Al2O3 layer on the rake face side, a length LR3 of a Σ3 crystal grain boundary exceeds 80% of a length LR3-29 of a Σ3-29 crystal grain boundary and is not lower than 10% and not higher than 50% of a total length LR of all grain boundaries. In the α-Al2O3 layer on the flank face side, a length LF3 of a Σ3 crystal grain boundary exceeds 80% of a length LF3-29 of a Σ3-29 crystal grain boundary and is not lower than 10% and not higher than 50% of a total length LF of all grain boundaries. A ratio LR3/LR3-29 is higher than a ratio LF3/LF3-29.
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