Cutting tool

Patent metadata

Field	Value
Publication number	US-10184176-B2
Application number	US-201415107207-A
Country	US
Kind code	B2
Filing date	Dec 25, 2014
Priority date	Dec 26, 2013
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

A cutting tool comprises a base including a hard alloy and a coating layer located on a surface of the base, wherein the coating layer comprises at least one TiCN layer, an Al 2 O 3 layer and an outermost layer which are laminated in order from a side of the base, and a content of Cl at a thickness-center position of the TiCN layer is higher than a content of Cl at a thickness-center position of the outermost layer and the content of Cl at the thickness-center position of the outermost layer is higher than a content of Cl at a thickness-center position of the Al 2 O 3 layer in a glow-discharge emission spectrometry (GDS analysis).

First claim

The invention claimed is:

1. A cutting tool comprising:
a base including a hard alloy; and
a coating layer located on a surface of the base,
wherein the coating layer comprises
at least one TiCN layer formed from Ti(C x1 N y1 O z1 ) (0<x1≤1, 0<y1≤1, 0≤z1≤1, x1+y1+z1=1);
an Al 2 O 3 layer; and
an outermost layer formed from Ti(C x2 N y2 O z2 ) (0≤x2≤1, 0≤y2≤1, 0≤z2≤1, x2+y2+z2=1),
which are laminated in order from a side of the base, and a content of Cl at a thickness-center position of the TiCN layer is higher than a content of Cl at a thickness-center position of the outermost layer and the content of Cl at the thickness-center position of the outermost layer is higher than a content of Cl at a thickness-center position of the Al 2 O 3 layer in a glow-discharge emission spectrometry (GDS analysis).

2. The cutting tool according to claim 1 , wherein, when the ratios of the contents of Cl in the thickness-center positions of the respective layers of the TiCN layer, the Al 2 O 3 layer and the outermost layer to the content of Cl in the base are respectively represented by Cl TiCN , Cl Al and Cl S , the following requirements are met: 10≤Cl TiCN ≤50; 0.3≤Cl Al ≤2; and 2≤Cl S ≤9.5.

3. The cutting tool according to claim 1 , wherein, when the ratios of the contents of W and Co in the respective layers of the TiCN layer, the Al 2 O 3 layer and the outermost layer to the contents of W and Co in the base are respectively represented by W TiCN , W Al , W s , Co TiCN , Co Al and Co s , the following requirements are met: 0.05≤W TiCN ≤0.3; W Al ≤0.01; W S ≤0.01; 0.05≤Co TiCN ≤0.3; Co Al ≤0.01; and Co S ≤0.01.

4. The cutting tool according to claim 1 , wherein a first intermediate layer formed from (Ti,Al)(C x3 N y3 O z3 ) (0≤x3≤1, 0≤y3≤1, 0≤z3≤1, x3+y3+z3=1) is located between the TiCN layer and the Al 2 O 3 layer.

5. The cutting tool according to claim 4 , wherein, when the ratio of the content of Cl in the first intermediate layer to the content of Cl in the base is represented by Cl m , the following requirement is met: 2≤Cl m ≤9.5.

6. The cutting tool according to claim 4 , wherein, when the ratios of the contents of W and Co in the first intermediate layer to the contents of W and Co in the base are respectively represented by W m and Co m , the following requirements are met: W m ≤0.05; and Co m ≤0.05.

7. The cutting tool according to claim 1 , wherein a second intermediate layer formed from (Ti,Al)(C x4 N y4 O z4 )(0≤x4≤1, 0≤y4≤1, 0≤z4≤1, x4+y4+z4=1) and having a high Cl content is located between the Al 2 O 3 layer and the outermost layer.

8. The cutting tool according to claim 7 , wherein, when the ratio of the content of Cl in the second intermediate layer to the content of Cl in the base is represented by Cl n , the following requirement is met: 5≤Cl n ≤25.

9. The cutting tool according to claim 7 , wherein the ratios of the contents of W and Co in the second intermediate layer to the contents of W and Co in the base are respectively represented by W n and Co n , the following requirements are met: W n ≤0.05; and Co n ≤0.05.

Assignees

• Kyocera Corp

Inventors

• Kubo Hayato
• Ri Kou

Classifications

• C23C28/042

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

• C23C16/36 Primary

  Carbonitrides · CPC title

• C23C28/048

  with layers graded in composition or physical properties · CPC title

• C23C8/80

  After-treatment · CPC title

• C23C10/60

  After-treatment · CPC title