Coated cutting tool

A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein:

• the coating layer comprises at least one α-type aluminum oxide layer;
• and
• in the α-type aluminum oxide layer, a texture coefficient TC (0,0,12) of a (0,0,12) plane represented by formula (1) below is from 4.0 or more to 8.4 or less, and a texture coefficient TC (1,2,11) of a (1,2,11) plane represented by formula (2) below is from 0.5 or more to 3.0 or less;
• TC
• ⁡
• (
• 0
• ,
• 0
• ,
• 12
• )
• =
• I
• ⁡
• (
• 0
• ,
• 0
• ,
• 12
• )
• I
• 0
• ⁡
• (
• 0
• ,
• 0
• ,
• 12
• )
• ⁢
• {
• 1
• 9
• ⁢
• ∑
• I
• ⁡
• (
• h
• ,
• k
• ,
• l
• )
• I
• 0
• ⁡
• (
• h
• ,
• k
• ,
• l
• )
• }
• -
• 1
• (
• 1
• )
• TC
• ⁡
• (
• 1
• ,
• 2
• ,
• 11
• )
• =
• I
• ⁡
• (
• 1
• ,
• 2
• ,
• 11
• )
• I
• 0
• ⁡
• (
• 1
• ,
• 2
• ,
• 11
• )
• ⁢
• {
• 1
• 9
• ⁢
• ∑
• I
• ⁡
• (
• h
• ,
• k
• ,
• l
• )
• I
• 0
• ⁡
• (
• h
• ,
• k
• ,
• l
• )
• }
• -
• 1
• (
• 2
• )
• (In formulae (1) and (2), I (h,k,l) denotes a peak intensity for an (h,k,l) plane in X-ray diffraction of the α-type aluminum oxide layer, I0 (h,k,l) denotes a standard diffraction intensity for an (h,k,l) plane which is indicated on JCPDS Card Number 10-0173 for α-type aluminum oxide, and (h,k,l) refers to the nine crystal planes of (0,1,2), (1,0,4), (1,1,0), (1,1,3), (1,1,6), (2,1,4), (3,0,0), (0,0,12) and (1,2,11).