Cutting tool and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2019247927-A1
Application number	US-201716070832-A
Country	US
Kind code	A1
Filing date	Dec 14, 2017
Priority date	Apr 25, 2017
Publication date	Aug 15, 2019
Grant date	—

Abstract

A cutting tool includes a base material, and a coating film covering the base material in contact with the base material. The base material is a cubic boron nitride sintered material. The coating film is a ceramic. An amount of oxygen in the coating film is less than or equal to 0.040 mass percent.

First claim

1 . A cutting tool comprising:
a base material; and a coating film covering the base material in contact with the base material, the base material being a cubic boron nitride sintered material, the coating film being a ceramic, an amount of oxygen in the coating film being less than or equal to 0.040 mass percent.

2 . The cutting tool according to claim 1 , wherein the amount of oxygen in the coating film is less than or equal to 0.010 mass percent.

3 . The cutting tool according to claim 1 , wherein
the cubic boron nitride sintered material is composed of more than or equal to 30 volume percent and less than or equal to 90 volume percent of cubic boron nitride, and a remainder including a binder, the binder is composed of at least one selected from a compound and a solid solution thereof, at least one of Al and an Al compound, and inevitable impurities, the compound being composed of at least one element selected from elements in groups 4, 5, and 6 of a periodic table and Si, and at least one selected from N, C, B, and O, the coating film has a thickness of more than or equal to 0.05 μm and less than or equal to 5 μm, and the ceramic includes at least one compound composed of at least one element selected from the elements in groups 4, 5, and 6 of the periodic table, Al, and Si, and at least one selected from C and N.

4 . A method for manufacturing a cutting tool, comprising:
a first step of placing a base material that is a cubic boron nitride sintered material within a chamber, emitting inert gas ions onto a surface of the base material, and thereby cleaning the surface of the base material; and a second step of forming a ceramic coating film on the surface of the base material placed within the chamber using a physical vapor deposition method, after the first step, in the first step and the second step, a total partial pressure of an oxygen partial pressure and a water partial pressure within the chamber being less than or equal to 5×10 −3 Pa.

5 . The method for manufacturing the cutting tool according to claim 4 , wherein, in the first step and the second step, the total partial pressure of the oxygen partial pressure and the water partial pressure within the chamber is less than or equal to 6×10 −4 Pa.

6 . The method for manufacturing the cutting tool according to claim 5 , wherein, in the first step and the second step, the oxygen partial pressure within the chamber is less than or equal to 1×10 −15 Pa.

Assignees

• Sumitomo Electric Industries
• Sumitomo Electric Hardmetal Corp

Inventors

• Okamura Katsumi
• Kukino Satoru
• Setoyama Makoto

Classifications

• C23C14/0641

  Nitrides (C23C14/0617 takes precedence) · CPC title

• C23C14/325

  Electric arc evaporation · CPC title

• C23C14/0021

  Reactive sputtering or evaporation · CPC title

• C22C2026/003

  Cubic boron nitrides only · CPC title

• B22F2005/001

  Cutting tools, earth boring or grinding tool other than table ware · CPC title