Coated tool
A coated tool is, for example, a cutting tool which is provided with a base material and a coating layer located on the base material, wherein a cutting edge and a flank surface are located on the coating layer, the coating layer has a portion in which at least a titanium carbonitride layer and an aluminum oxide layer having an α-type crystal structure are laminated in this order, and, with regard to a texture coefficient (Tc) (hkl) which is calculated on a basis of a peak of the aluminum oxide layer analyzed by an X-ray diffraction analysis, a texture coefficient (Tc1) (146) as measured from a surface side of the aluminum oxide layer in the flank surface is 1 or more.
1. A coated tool comprising,
a base material comprising a first surface and a second surface; and
coating layers located over the base material and comprising,
a first layer including titanium carbonitride and located over the base material, and
a second layer including aluminum oxide having an alpha-type crystal structure and located over the first layer; wherein
the second layer comprises a first portion located over the first surface and a second portion located over the second surface, and
a texture coefficient Tc1 (146) as measured on an outermost surface of the first portion is 1 or more, wherein the texture coefficient Tc (hkl) is a value expressed by the formula shown below on the basis of a peak of the second layer analyzed by an X-ray diffraction analysis:
a texture coefficient Tc ( hkl )={ I ( hkl )/ I 0 ( hkl )}/[(⅛)×Σ{ I ( HKL )/ I 0 ( HKL )}]
wherein (HKL) represents a crystal face (012), (104), (110), (113), (024), (116), (214) or (146);
each of I(HKL) and I(hkl) represents a peak intensity of a peak which is attributed to each crystal face and is detected by an X-ray diffraction analysis of the second layer; and
each of I 0 (HKL) and I 0 (hkl) represents a reference diffraction intensity of each crystal face contained in a JCPDS card No. 00-010-0173.
2. The coated tool according to claim 1 , wherein a texture coefficient Tc2 (146) is smaller than the Tc1 (146), wherein the texture coefficient Tc2 (146) is measured on a surface of the first portion in which 10-40 percent of a thickness of the first portion is removed by polishing.
3. The coated tool according to claim 1 , wherein one of I(116) and I(104) is the first most-intense peak and another one of I(104) and I(116) is the second most-intense peak among surface side peaks detected in measurement on the outermost surface of the first portion.
4. The coated tool according to claim 1 , wherein a texture coefficient Tc3 (104) which is measured from above a top surface of the second portion is smaller than a texture coefficient Tc1 (104) which is measured on the outermost surface of the first portion.
5. The coated tool according to claim 1 , wherein the top surface of the first portion comprises a flank surface.
6. The coated tool according to claim 1 , wherein a top surface of the second portion comprises a rake surface.
7. The coated tool according to claim 1 , wherein the texture coefficient Tc1 (146) is in a range of 1 to 5.