Surface-coated cutting tool
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United States of America Patent
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Jan 30, 2018
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N/A
app pub date -
Jul 13, 2015
filing date -
Jul 13, 2015
priority date (Note) -
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Abstract
A surface-coated cutting tool according to the present invention is provided with a base material and a coating formed on the base material, the coating includes an α-Al2O3 layer, the α-Al2O3 layer includes a plurality of crystal grains of α-Al2O3 and shows (001) orientation, a grain boundary of the crystal grains contains a CSL grain boundary and a general grain boundary, and a length of a Σ3 crystal grain boundary out of the CSL grain boundary exceeds 80% of a length of a Σ3-29 crystal grain boundary and is equal to or more than 10% and equal to or less than 50% of the total length of all grain boundaries which is the sum of the length of the Σ3-29 crystal grain boundary and a length of the general grain boundary.
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