Coated tool

Patent metadata

Field	Value
Publication number	US-10837104-B2
Application number	US-201615755589-A
Country	US
Kind code	B2
Filing date	Aug 29, 2016
Priority date	Aug 29, 2015
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A cutting tool in an embodiment includes a base member composed of cemented carbide and a coating layer located on a surface of the base member. The coating layer includes a first layer which is in contact with the base member and contains Ti(CxN1-x) (0≤x≤1). A KAM average value of WC particles in a region extending to a depth of 5 μm from the surface of the base member is 1° or less, which is measured by electron backscatter diffraction (EBSD) method using a scanning electron microscope with an electron backscatter diffraction imaging system.

First claim

What is claimed is:

1. A coated tool, comprising:
a base member composed of cemented carbide; and
a coating layer located on a surface of the base member,
the coating layer comprising a first layer which is in contact with the base member and contains Ti(C x N 1-x ) (0≤x≤1),
wherein
a KAM average value of WC particles in a region extending to a depth of 5 μm from the surface of the base member is 1° or less, which is measured by electron backscatter diffraction (EBSD) method using a scanning electron microscope with an electron backscatter diffraction imaging system.

2. The coated tool according to claim 1 , wherein
the first layer has a thickness of 6-15 μm.

3. The coated tool according to claim 1 , wherein
the first layer comprises a first region in contact with the base member and a second region located on the first region, and
a carbon content of the first region is smaller than a carbon content of the second region.

4. The coated tool according to claim 3 , wherein the first region has a thickness of 0.5-3 μm, and the second region has a thickness of 5.5-14.5 μm.

5. The coated tool according to claim 1 , wherein the coating layer further comprises:
a second layer which is located on the first layer and contains Ti(C x N 1-x-y O y ) (0<x<1, 0<y<1), and
a third layer which is located on the second layer and contains aluminum oxide.

6. The coated tool according to claim 1 , wherein
the first layer comprises a columnar crystal of titanium carbonitride extending in a direction perpendicular to the surface of the base member, and
a width of the columnar crystal in a direction parallel to the surface of the base member is 0.4 μm or less.

7. The coated tool according to claim 1 , wherein
a ratio of a carbon content in a region extending to a depth of 5 μm from the surface of the base member to a carbon content in a region extending to a depth of 200 μm or more from the surface of the base member is from 0.95 to 1.

Assignees

• Kyocera Corp

Inventors

• Kubo Hayato

Classifications

• C23C28/044

  coatings specially adapted for cutting tools or wear applications · CPC title

• C23C28/042

  including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides · CPC title

• C23C16/34

  Nitrides {(C23C16/303 takes precedence)} · CPC title

• B23B2224/32

  Titanium carbide nitride (TiCN) · CPC title

• B23B27/148

  Composition of the cutting inserts · CPC title