High temperature oxidation resistant rare metal-free hard sintered body and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10493529-B2
Application number	US-201515517207-A
Country	US
Kind code	B2
Filing date	Oct 2, 2015
Priority date	Oct 10, 2014
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

Provided is a hard sintered body which exhibits excellent high temperature oxidation resistance and has a high hardness at a high temperature. In the hard sintered body, a binder phase is contained at from 8.8 to 34.4 mol % and the balance is composed of a hard phase and inevitable impurities. The binder phase contains iron aluminide containing FeAl as a main component and alumina that is dispersed in iron aluminide and has a particle size of 1 μm or less. The hard phase is composed of at least one kind selected from carbides, nitrides, carbonitrides and borides of Group 4 metals, Group 5 metals and Group 6 metals in the periodic table, and solid solutions of these. This hard sintered body is obtained by mixing and pulverizing a binding particle powder containing an iron aluminide powder composed of at least one kind selected from FeAl 2 , Fe 2 Al 5 and FeAl 3 and a hard particle powder composed of at least one kind selected from carbides, nitrides, carbonitrides and borides of Group 4 metals, Group 5 metals and Group 6 metals in the periodic table and then sintering a mixed powder thus obtained.

First claim

The invention claimed is:

1. A hard sintered body consisting of a binder phase at from 8.8 to 34.4 mol % and the balance being a hard phase and unavoidable impurities, wherein
the binder phase contains iron aluminide containing FeAl as a main component and alumina that is dispersed in the iron aluminide and has a particle size of 1 μm or less, and optionally contains at least one selected from the group consisting of boron, silicon, chromium, niobium and molybdenum, and
the hard phase includes at least one selected from the group consisting of carbide of Ti, nitride of Ti, carbonitride of Ti, boride of Ti, and solid solutions thereof, and optionally includes at least one selected from the group consisting of tungsten carbide and a solid solution of tungsten carbide.

2. The hard sintered body according to claim 1 , wherein the hard phase includes the at least one selected from the group consisting of tungsten carbide and a solid solution of tungsten carbide.

3. The hard sintered body according to claim 1 , wherein the binder phase contains the at least one selected from the group consisting of boron, silicon, chromium, niobium and molybdenum.

4. The hard sintered body according to claim 1 , wherein a content of the alumina in the binder phase is from 24.2 to 50.0 mol %.

5. The hard sintered body according to claim 1 , wherein a content of aluminum in iron aluminide in the binder phase is from 24.6 to 57.7 mol %.

6. A cutting or wear-resistant tool comprising the hard sintered body according to claim 1 as a raw material.

7. A hard sintered body consisting of a binder phase at from 8.8 to 34.4 mol % and the balance being a hard phase and unavoidable impurities, wherein
the binder phase contains iron aluminide containing FeA1 as a main component and alumina that is dispersed in the iron aluminide and has a particle size of 1 μm or less,
the binder phase further contains at least one selected from the group consisting of boron, silicon, chromium, niobium and molybdenum, and
the hard phase includes at least one selected from the group consisting of carbides, nitrides, carbonitrides, borides of Group 4 metals, Group 5 metals or Group 6 metals in the periodic table, and solid solutions thereof.

8. The hard sintered body according to claim 7 , wherein a content of the alumina in the binder phase is from 24.2 to 50.0 mol %.

9. The hard sintered body according to claim 7 , wherein a content of aluminum in iron aluminide in the binder phase is from 24.6 to 57.7 mol %.

10. A cutting or wear-resistant tool comprising the hard sintered body according to claim 7 as a raw material.

Assignees

• Aist

Inventors

• Shimojima Koji
• FURUSHIMA Ryouichi
• Hosokawa Hiroyuki
• Katou Kiyotaka
• Matsumoto Akihiro

Classifications

• B22F1/10

  Metallic powder containing lubricating or binding agents; Metallic powder containing organic material · CPC title

• B22F2201/11

  Argon · CPC title

• C22C29/08

  based on tungsten carbide · CPC title

• B22F2005/001

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

• C22C29/04

  based on carbonitrides · CPC title