Coated cutting tool

Patent metadata

Field	Value
Publication number	US-2020070253-A1
Application number	US-201916554067-A
Country	US
Kind code	A1
Filing date	Aug 28, 2019
Priority date	Sep 4, 2018
Publication date	Mar 5, 2020
Grant date	—

Abstract

A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein: the coating layer comprises a lower layer, an intermediate layer and an upper layer, the lower layer, the intermediate layer and the upper layer being laminated in order from the substrate side toward a surface side of the coating layer; the lower layer comprises a Ti compound layer; the intermediate layer contains α-Al2O3; the upper layer contains TiCN; an average thickness of each of the lower layer, the intermediate layer, and the upper layer is within a specific range; a ratio of a length of Σ3 grain boundaries to a total 100% length of all grain boundaries in a specific region of the upper layer is from 20% or more to 60% or less; and a ratio of (111)-oriented grains in the upper layer is 30 area % or more.

First claim

What is claimed is:

1 . A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein:
the coating layer comprises a lower layer, an intermediate layer and an upper layer, the lower layer, the intermediate layer and the upper layer being laminated in order from the substrate side toward a surface side of the coating layer; the lower layer comprises one Ti compound layer or two or more Ti compound layers containing a Ti compound of Ti and an element of at least one kind selected from the group consisting of C, N, O and B; the intermediate layer contains α-Al 2 O 3 ; the upper layer contains TiCN; an average thickness of the lower layer is from 4.0 μm or more to 10.0 μm or less; an average thickness of the intermediate layer is from 3.0 μm or more to 10.0 pm or less; an average thickness of the upper layer is from 1.5 μm or more to 6.5 μm or less; a ratio of a length of Σ3 grain boundaries to a total 100% length of all grain boundaries in a specific region of the upper layer is from 20% or more to 60% or less; and a ratio of (111)-oriented grains in the upper layer is 30 area % or more.

2 . The coated cutting tool according to claim 1 , wherein the ratio of (111)-oriented grains in the upper layer is 55 area % or less.

3 . The coated cutting tool according to claim 1 , wherein a content of chlorine (Cl) in the upper layer is 0.1 atom % or less.

4 . The coated cutting tool according to claim 1 , wherein an average thickness of the coating layer is from 10.0 μm or more to 25.0 μm or less.

5 . The coated cutting tool according to claim 1 , wherein the Ti compound layer is at least one kind selected from the group consisting of TiN, TiC, TiCN, TiCNO, TiON and TiB 2 .

6 . The coated cutting tool according to claim 1 , wherein the substrate is a cemented carbide, cermet, ceramic or a cubic boron nitride sintered body.

7 . The coated cutting tool according to claim 2 , wherein a content of chlorine (Cl) in the upper layer is 0.1 atom % or less.

8 . The coated cutting tool according to claim 2 , wherein an average thickness of the coating layer is from 10.0 μm or more to 25.0 μm or less.

9 . The coated cutting tool according to claim 3 , wherein an average thickness of the coating layer is from 10.0 μm or more to 25.0 μm or less.

10 . The coated cutting tool according to claim 7 , wherein an average thickness of the coating layer is from 10.0 μm or more to 25.0 μm or less.

11 . The coated cutting tool according to claim 2 , wherein the Ti compound layer is at least one kind selected from the group consisting of TiN, TiC, TiCN, TiCNO, TiON and TiB 2 .

12 . The coated cutting tool according to claim 3 , wherein the Ti compound layer is at least one kind selected from the group consisting of TiN, TiC, TiCN, TiCNO, TiON and TiB 2 .

13 . The coated cutting tool according to claim 4 , wherein the Ti compound layer is at least one kind selected from the group consisting of TiN, TiC, TiCN, TiCNO, TiON and TiB 2 .

14 . The coated cutting tool according to claim 7 , wherein the Ti compound layer is at least one kind selected from the group consisting of TiN, TiC, TiCN, TiCNO, TiON and TiB 2 .

15 . The coated cutting tool according to claim 8 , wherein the Ti compound layer is at least one kind selected from the group consisting of TiN, TiC, TiCN, TiCNO, TiON and TiB 2 .

16 . The coated cutting tool according to claim 9 , wherein the Ti compound layer is at least one kind selected from the group consisting of TiN, TiC, TiCN, TiCNO, TiON and TiB 2 .

17 . The coated cutting tool according to claim 10 , wherein the Ti compound layer is at least one kind selected from the group consisting of TiN, TiC, TiCN, TiCNO, TiON and TiB 2 .

18 . The coated cutting tool according to claim 2 , wherein the substrate is a cemented carbide, cermet, ceramic or a cubic boron nitride sintered body.

19 . The coated cutting tool according to claim 3 , wherein the substrate is a cemented carbide, cermet, ceramic or a cubic boron nitride sintered body.

20 . The coated cutting tool according to claim 4 , wherein the substrate is a cemented carbide, cermet, ceramic or a cubic boron nitride sintered body.

Assignees

• Tungaloy Corp

Inventors

• Fukushima Naoyuki

Classifications

• C23C16/0272

  Deposition of sub-layers, e.g. to promote the adhesion of the main coating · CPC title

• C23C30/005 Primary

  on hard metal substrates · CPC title

• C23C16/36

  Carbonitrides · CPC title

• C23C16/403

  of aluminium, magnesium or beryllium · CPC title

• C23C16/0254

  Physical treatment to alter the texture of the surface, e.g. scratching or polishing · CPC title