US Patent 11103930 Cutting tool
Patent 11103930 was granted and assigned to Sumitomo Electric Hardmetal Corp. on August, 2021 by the United States Patent and Trademark Office.
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A cutting tool includes: a substrate including a rake face; and a coating film that coats the rake face, wherein the coating film includes an α-Al2O3 layer disposed on the substrate, the α-Al2O3 layer includes crystal grains of α-Al2O3, an area ratio of crystal grains oriented in (001) among the crystal grains is 50% to 90% in the α-Al2O3 layer at the rake face, a film residual stress AA determined based on a crystal plane interval of a (001) plane of the α-Al2O3 layer at the rake face is more than or equal to −1000 MPa and less than 0 MPa, and a film residual stress BA determined based on a crystal plane interval of a (110) plane of the α-Al2O3 layer at the rake face is more than or equal to −1000 MPa and less than 0 MPa, and a relational expression of |AA|≤|BA| is satisfied.
US Patent 11103930 Cutting tool
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