公开(公告)号：US20170304898A1

公开(公告)日：2017-10-26

申请号：US15517207

申请日：2015-10-02

Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY

Inventor： Koji SHIMOJIMA ,  Ryouichi FURUSHIMA ,  Hiroyuki HOSOKAWA ,  Kiyotaka KATOU ,  Akihiro MATSUMOTO

IPC: B22F3/14 ,  C22C29/04 ,  B22F1/00

CPC classification number: B22F3/14 ,  B22F1/0059 ,  B22F2005/001 ,  B22F2201/02 ,  B22F2201/11 ,  B22F2201/20 ,  B22F2302/10 ,  B22F2302/15 ,  B22F2998/10 ,  C22C29/02 ,  C22C29/04 ,  C22C29/08 ,  C22C29/14 ,  C22C29/16 ,  B22F9/04

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 FeAl2, Fe2Al5 and FeAl3 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.