Surface-coated cutting tool
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United States of America Patent
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Jan 9, 2018
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app pub date -
Jun 21, 2016
filing date -
Oct 9, 2015
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Abstract
A surface-coated cutting tool includes a base material and a coating formed on the base material. The coating includes an α-Al2O3 layer. The α-Al2O3 layer contains a plurality of α-Al2O3 crystal grains and a plurality of κ-Al2O3 crystal grains, and has a TC(006) of more than 5 in a texture coefficient TC(hkl). A ratio of Cκ to a sum of Cα and Cκ: [Cκ/(Cα+Cκ)×100](%) is 0.05 to 7%, where Cα is a total number of peak counts of the α-Al2O3 crystal grains obtained from measurement data of x-ray diffraction for the coating, and Cκ is a total number of peak counts of the κ-Al2O3 crystal grains obtained from the measurement data of the x-ray diffraction for the coating.
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