Iron based sintered sliding member and method for producing same

Patent metadata

Field	Value
Publication number	US-10131972-B2
Application number	US-201414201209-A
Country	US
Kind code	B2
Filing date	Mar 7, 2014
Priority date	Mar 13, 2013
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

An iron-based sintered sliding member is provided in which solid lubricating agent is dispersed uniformly inside of powder particles in addition to inside of pores and particle interfaces of the powder, the agent is strongly fixed, and sliding properties and mechanical strength are superior. The iron-based sintered sliding member contains S: 0.2 to 3.24 mass %, Cu: 3 to 10 mass %, remainder: Fe and inevitable impurities, as an overall composition; the metallic structure includes a base in which sulfide particles are dispersed, and pores; the base is a ferrite phase or a ferrite phase in which copper phase is dispersed; and the sulfide particles are dispersed at a ratio of 0.8 to 15.0 vol % versus the base.

First claim

What is claimed is:

1. An iron-based sintered sliding member consisting of:
S: 0.2 to 3.42 mass %,
Cu: 3 to 10 mass %, and
remainder: Fe and inevitable impurities, as an overall composition,
wherein a metallic structure comprises a base in which sulfide particles including iron sulfide as a main component are segregated in the base and dispersed within grains and grain boundaries, and pores, and
wherein the base is a ferrite phase or a ferrite phase in which a copper phase is dispersed.

2. The iron-based sintered sliding member according to claim 1 , wherein the impurities contain Mn: 0.02 to 1.2 mass %.

3. The iron-based sintered sliding member according to claim 1 , wherein a total area of the sulfide particles having 10 μm or more of particle diameter in a circle-equivalent diameter accounts for 30% or more of a total area of the entirety of the sulfide particles.

4. The iron-based sintered sliding member according to claim 1 , wherein the sliding member has a friction coefficient of 0.7 or less and a radial crushing strength of 350 MPa or more.

5. An iron-based sintered sliding member consisting of:
S: 0.2 to 3.42 mass %,
Cu: 3 to 10 mass %,
at least one of Ni and Mo, at more than 0 mass % and 10 mass % or less, each, and
remainder: Fe and inevitable impurities, as an overall composition,
wherein a metallic structure comprises a base in which sulfide particles including iron sulfide as a main component are segregated in the base and dispersed within grains and grain boundaries, and pores, and
wherein the base is a ferrite phase or a ferrite phase in which a copper phase is dispersed.

Assignees

• Hitachi Chemical Co Ltd

Inventors

• Fukae Daisuke
• Kawata Hideaki

Classifications

• B22F1/105

  containing inorganic lubricating or binding agents, e.g. metal salts · CPC title

• B22F3/12

  Both compacting and sintering (by forging B22F3/17) · CPC title

• C22C33/0257 Primary

  characterised by the range of the alloying elements · CPC title

• B22F1/007

  Operations & Transport · mapped topic