Patent ID: 8747990

Claim:
A coated tool comprising a substrate and a coating provided on the surface of the substrate, at least one layer of the coating being an α-type aluminum oxide film, an average film thickness of the α-type aluminum oxide film being about 0.5 to about 10 μm, an average grain size of α-type aluminum oxide grains in the α-type aluminum oxide film being about 0.5 μm to 0.8 μm, and a first texture coefficient TC A (012) of a (012) plane of the α-type aluminum oxide film and a second texture coefficient TC A (104) of a (104) plane of the α-type aluminum oxide film satisfy TC A (104)/TC A (012) 2.0, wherein: TC A ⁡ ( 012 ) = I A ⁡ ( 012 ) I A ⁢ ⁢ 0 ⁡ ( 012 ) 1 8 ⁡ [ I A ⁡ ( 012 ) I A ⁢ ⁢ 0 ⁡ ( 012 ) + I A ⁡ ( 104 ) I A ⁢ ⁢ 0 ⁡ ( 104 ) + I A ⁡ ( 110 ) I A ⁢ ⁢ 0 ⁡ ( 110 ) + I A ⁡ ( 113 ) I A ⁢ ⁢ 0 ⁡ ( 113 ) + ⁢ ⁢ I A ⁡ ( 024 ) I A ⁢ ⁢ 0 ⁡ ( 024 ) + I A ⁡ ( 116 ) I A ⁢ ⁢ 0 ⁡ ( 116 ) + I A ⁡ ( 124 ) I A ⁢ ⁢ 0 ⁡ ( 124 ) + I A ⁡ ( 030 ) I A ⁢ ⁢ 0 ⁡ ( 030 ) ] ; TC A ⁡ ( 104 ) = I A ⁡ ( 104 ) I A ⁢ ⁢ 0 ⁡ ( 104 ) 1 8 ⁡ [ I A ⁡ ( 012 ) I A ⁢ ⁢ 0 ⁡ ( 012 ) + I A ⁡ ( 104 ) I A ⁢ ⁢ 0 ⁡ ( 104 ) + I A ⁡ ( 110 ) I A ⁢ ⁢ 0 ⁡ ( 110 ) + I A ⁡ ( 113 ) I A ⁢ ⁢ 0 ⁡ ( 113 ) + ⁢ ⁢ I A ⁡ ( 024 ) I A ⁢ ⁢ 0 ⁡ ( 024 ) + I A ⁡ ( 116 ) I A ⁢ ⁢ 0 ⁡ ( 116 ) + I A ⁡ ( 124 ) I A ⁢ ⁢ 0 ⁡ ( 124 ) + I A ⁡ ( 030 ) I A ⁢ ⁢ 0 ⁡ ( 030 ) ] ; I A (hkl): X-ray diffraction intensity measured at (hkl) plane of the α-type aluminum oxide film; I A0 (hkl): standard X-ray diffraction intensity of the (hkl) plane of α-type aluminum oxide according to JCPDS card No. 10-173; (hkl) are eight planes of (012), (104), (110), (113), (024), (116), (124) and (030); and the α-type aluminum oxide film is columnar crystal.