Cermet and cutting tool

Patent metadata

Field	Value
Publication number	US-9850557-B2
Application number	US-201514897206-A
Country	US
Kind code	B2
Filing date	Jan 8, 2015
Priority date	Apr 10, 2014
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A cermet contains hard phase particles containing Ti and a binding phase containing at least one of Ni and Co. 70% or more of the hard phase particles have a cored structure containing a core and a peripheral portion around the core. The core is composed mainly of at least one of Ti carbide, Ti nitride, and Ti carbonitride. The peripheral portion is composed mainly of a Ti composite compound containing Ti and at least one selected from W, Mo, Ta, Nb, and Cr. The core has an average particle size α, the peripheral portion has an average particle size β, and α and β satisfy 1.1≦β/α≦1.7. The hard phase particles in the cermet have an average particle size of more than 1.0 μm.

First claim

The invention claimed is:

1. A cermet comprising: hard phase particles containing Ti; and a binding phase containing at least one of Ni and Co,
wherein 70% or more of the hard phase particles have a cored structure containing a core and a peripheral portion around the core,
the core is composed mainly of at least one of Ti carbide, Ti nitride, and Ti carbonitride,
the peripheral portion is composed mainly of a Ti composite compound containing Ti and at least one selected from W, Mo, Ta, Nb, and Cr,
the core has an average particle size α, the 70% or more of the hard phase particles have an average particle size β, and α and β satisfy 1.1≦β/α≦1.7, and
the hard phase particles in the cermet have an average particle size of more than 1.0 μm.

2. The cermet according to claim 1 , wherein the hard phase particles in the cermet have an average particle size of 5.0 μm or less.

3. The cermet according to claim 1 , wherein the cermet has
a Ti content in the range of 50% to 70% by mass,
a W, Mo, Ta, Nb, and Cr content in the range of 15% to 30% by mass, and
a Co and Ni content in the range of 15% to 20% by mass.

4. A cutting tool, comprising the cermet according to claim 1 as a substrate.

5. The cutting tool according to claim 4 , wherein at least part of a surface of the substrate is covered with a hard film.

6. The cermet according to claim 1 , wherein the cermet has a thermal conductivity of 20 W/m·K or more.

Assignees

• Sumitomo Electric Industries

Inventors

• Yamanishi Takato
• Tsuda Keiichi

Classifications

• B22F1/17

  Metallic particles coated with metal · CPC title

• B22F2302/15

  Carbonitride · CPC title

• B22F2302/10

  Carbide · CPC title

• B22F2301/20

  Refractory metals · CPC title

• B22F2005/001

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