Cutting tools

Patent metadata

Field	Value
Publication number	US-2024189921-A1
Application number	US-202218284866-A
Country	US
Kind code	A1
Filing date	Feb 7, 2022
Priority date	Feb 7, 2022
Publication date	Jun 13, 2024
Grant date	—

Abstract

A cutting tool comprising a base material and a coating; wherein: the coating comprises a titanium compound layer and an a-Al 2 O 3 layer; the a-Al 2 O 3 layer comprises a region A 1 and a region A 2 ; the titanium compound layer comprises a region B 1 and a region B 2 ; an average particle diameter a1 of the a-Al 2 O 3 particles in the region A 1 , an average particle diameter a2 of the a-Al 2 O 3 particles in the region A 2 , an average particle diameter b1 of the titanium compound particles in the region B 1 , and an average particle diameter b2 of the titanium compound particles in the region B 2 satisfy relationships represented by respective expressions 1 to 3:
0.80≤ a 2/ b 2≤1.27  Expression 1

1.50≤ a 1/ a 2≤10  Expression 2

1.45≤ b 1/ b 2≤5  Expression 3

: and
the average particle diameter b1 is 0.10 μm or more and 0.50 μm or less.

First claim

1 . A cutting tool comprising a base material and a coating arranged on the base material; wherein:
the coating comprises a titanium compound layer arranged on the base material and an a-Al 2 O 3 layer arranged directly on the titanium compound layer; the a-Al 2 O 3 layer is composed of a plurality of a-Al 2 O 3 particles; the a-Al 2 O 3 layer comprises a region A 1 and a region A 2 ; the region A 1 is a region sandwiched between an imaginary plane SA 2 , which is located at a distance of 0.5 μm from an interface P 1 between the titanium compound layer and the a-Al 2 O 3 layer toward the surface side of the coating, and an imaginary plane SA 3 , which is located at a distance of 1.0 μm from the interface P 1 toward the surface side of the coating; the region A 2 is a region sandwiched between the interface P 1 and an imaginary plane SA 1 that is located at a distance of 0.3 μm from the interface P 1 toward the surface side of the coating; the titanium compound layer is composed of a plurality of titanium compound particles; the titanium compound particles are one selected from the group consisting of TiCN particles, TiCNO particles, TiAlCN particles and TiAlCNO particles: the titanium compound layer comprises a region B 1 and a region B 2 ; the region B 1 is a region sandwiched between an imaginary plane SB 2 , which is located at a distance of 0.5 μm from the interface P 1 toward the base material side, and an imaginary plane SB 3 , which is located at a distance of 1.0 μm from the interface P 1 toward the base material side; the region B 2 is a region sandwiched between the interface P 1 and an imaginary plane SB 1 that is located at a distance of 0.3 μm from the interface P 1 toward the base material side; an average particle diameter a1 of the a-Al 2 O 3 particles in the region A 1 , an average particle diameter a2 of the a-Al 2 O 3 particles in the region A 2 , an average particle diameter b1 of the titanium compound particles in the region B 1 , and an average particle diameter b2 of the titanium compound particles in the region B 2 satisfy relationships represented by respective expressions 1 to 3:
0.80≤ a 2/ b 2≤1.27  Expression 1

1.50≤ a 1/ a 2≤10  Expression 2

1.45≤ b 1/ b 2≤5  Expression 3

and
the average particle diameter b1 is 0.10 μm or more and 0.50 μm or less.

2 . The cutting tool according to claim 1 , wherein:
a ratio R 1 /R 2 between a ratio R 1 of the number of carbon atoms relative to the total number of carbon, nitrogen and oxygen atoms in the region B 1 and a ratio R 2 of the number of carbon atoms relative to the total number of carbon, nitrogen and oxygen atoms in the region B 2 is 0.9 or more and 1.1 or less; a ratio R 3 of the total number of carbon and nitrogen atoms relative to the total number of carbon, nitrogen and oxygen atoms in the region B 1 is 0.8 or more and 1.0 or less; and a ratio R 4 of the total number of carbon and nitrogen atoms relative to the total number of carbon, nitrogen and oxygen atoms in the region B 2 is 0.8 or more and 1.0 or less.

3 . The cutting tool according to claim 1 ,
wherein: a ratio a1/b1 of the average particle diameter a1 to the average particle diameter b1 is 1.50 or more and 5 or less; and the average particle diameter a1 is 0.40 μm or more and 1.00 μm or less.

4 . The cutting tool according to claim 1 , wherein:
an average thickness of the titanium compound layer is 1.0 μm or more and 15 μm or less; and an average thickness of the a-Al 2 O 3 layer is 1.0 μm or more and 15 μm or less.

5 . The cutting tool according to claim 1 , wherein the a-Al 2 O 3 layer has a TC (0 0 12) of 3 or more in an orientation index TC (hkl).

6 . The cutting tool according to claim 1 , wherein the coating comprises a TiN layer arranged between the base material and the titanium compound layer.

7 . The cutting tool according to claim 1 , wherein the ratio a2/b2 of the average particle diameter a2 to the average particle diameter b2 is 1.00 or more and 1.10 or less.

8 . The cutting tool according to claim 1 , wherein the ratio a1/a2 of the average particle diameter a1 to the average particle diameter a2 is 2.00 or more and 10 or less.

9 . The cutting tool according to claim 1 , wherein the ratio b1/b2 of the average particle diameter b1 to the average particle diameter b2 is 1.50 or more and 5 or less.

10 . The cutting tool according to claim 1 , wherein a ratio a1/b1 of the average particle diameter a1 to the average particle diameter b1 is 2.00 or more and 4.50 or less.

11 . The cutting tool according to claim 1 , wherein the average particle diameter b1 is 0.15 μm or more and 0.50 μm or less.

12 . The cutting tool according to claim 5 , wherein the TC (0 0 12) is 4 or more.

13 . The cutting tool according to claim 1 , wherein the average particle diameter a1 is 0.30 μm or more and 1.20 μm or less.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Hikiji Masahito
• Okuno Susumu
• Yamanishi Takato

Classifications

• B23B2228/44

  Materials having grain size less than 1 micrometre, e.g. nanocrystalline · CPC title

• B23B2228/36

  Multi-layered · CPC title

• B23B2228/105

  with specified thickness · CPC title

• B23B2224/32

  Titanium carbide nitride (TiCN) · CPC title

• B23B2224/04

  Aluminium oxide · CPC title