Surface-coated cutting tool

Patent metadata

Field	Value
Publication number	US-9863064-B2
Application number	US-201615320914-A
Country	US
Kind code	B2
Filing date	Jun 21, 2016
Priority date	Oct 9, 2015
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A surface-coated cutting tool includes a base material and a coating formed on the base material. The coating includes an α-Al 2 O 3 layer. The α-Al 2 O 3 layer contains a plurality of α-Al 2 O 3 crystal grains and a plurality of κ-Al 2 O 3 crystal grains, and has a TC(006) of more than 5 in a texture coefficient TC(hkl). A ratio of C κ to a sum of C α and C κ : [C κ /(C α +C κ )×100](%) is 0.05 to 7%, where C α is a total number of peak counts of the α-Al 2 O 3 crystal grains obtained from measurement data of x-ray diffraction for the coating, and C κ is a total number of peak counts of the κ-Al 2 O 3 crystal grains obtained from the measurement data of the x-ray diffraction for the coating.

First claim

The invention claimed is:

1. A surface-coated cutting tool comprising a base material and a coating formed on the base material,
the coating including an α-Al 2 O 3 layer,
the α-Al 2 O 3 layer containing a plurality of α-Al 2 O 3 crystal grains and a plurality of κ-Al 2 O 3 crystal grains, and having a TC(006) of more than 5 in a texture coefficient TC(hkl),
a ratio of C κ to a sum of C α and C κ : [C κ /(C α +C κ )×100](%) being 0.05 to 7%, where C α is a total number of peak counts of the α-Al 2 O 3 crystal grains obtained from measurement data of x-ray diffraction for the coating, and C κ is a total number of peak counts of the κ-Al 2 O 3 crystal grains obtained from the measurement data of the x-ray diffraction for the coating,
in the α-Al 2 O 3 layer, an area ratio X of the κ-Al 2 O 3 crystal grains to all Al 2 O 3 crystal grains in a measurement field of view being 0.1 to 20%, the measurement field of view being derived from an analysis with an electron backscatter diffraction apparatus for a region from a front surface of the α-Al 2 O 3 layer inward to a depth of 1 μm, and
in the α-Al 2 O 3 layer, an area ratio Y of the κ-Al 2 O 3 crystal grains to all Al 2 O 3 crystal grains in a measurement field of view being smaller than the area ratio X, the measurement field of view being derived from an analysis with the electron backscatter diffraction apparatus for a region beyond the region from the front surface of the α-Al 2 O 3 layer inward to the depth of 1 μm.

2. The surface-coated cutting tool according to claim 1 , wherein
the α-Al 2 O 3 layer has an average layer thickness of 2 to 15 μm.

3. The surface-coated cutting tool according to claim 1 , wherein in a surface of the coating, an outermost surface layer in which any one of Ti carbide, Ti nitride, and Ti boride is a main component is disposed.

4. The surface-coated cutting tool according to claim 1 , wherein
the coating has an intermediate layer between the α-Al 2 O 3 layer and the base material,
the intermediate layer contains acicular TiCNO or acicular TiBN and has an average layer thickness of 0.3 to 1 μm, and
a difference between a maximum thickness and a minimum thickness of the intermediate layer is 0.3 μm or more.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Kanaoka Hideaki
• Imamura Shinya
• Paseuth Anongsack
• Detani Takanori

Classifications

• B23B2224/04

  Aluminium oxide · CPC title

• B23B2224/28

  Titanium carbide · CPC title

• C30B28/14

  by chemical reaction of reactive gases · CPC title

• C23C16/36

  Carbonitrides · CPC title

• B23B2228/105

  with specified thickness · CPC title