Sliding member

Patent metadata

Field	Value
Publication number	US-9677021-B2
Application number	US-201514711093-A
Country	US
Kind code	B2
Filing date	May 13, 2015
Priority date	May 14, 2014
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

Provided is a sliding member having: a back metal layer; and a sliding layer on the back metal layer. The sliding layer includes a porous sintered layer and a resin composition. The sintered layer includes Ni—P alloy phase and granular steel phase made of a carbon steel including 0.3-1.3 mass % of carbon and having a structure of: ferrite phase; and perlite phase, or perlite phase and cementite phase. The Ni—P alloy phase binds the steel phases with one another and/or binds the steel phases with the back metal layer. The steel phase includes a low perlite phase part in a surface. The low perlite phase part has an area ratio of the perlite phase lowered by 50% or more compared with a total area ratio of the perlite phase and the cementite phase at a central part of the steel phase when observed in a cross-section.

First claim

The invention claimed is:

1. A sliding member comprising: a back metal layer;
and a sliding layer on the back metal layer, the sliding layer including a porous sintered layer and a resin composition,
wherein the porous sintered layer includes Ni—P alloy phase and granular steel phase, the granular steel phase being made of a carbon steel including 0.3-1.3 mass % of carbon and having a structure consisting essentially of:
ferrite phase; and
perlite phase and optionally cementite phase,
wherein the Ni—P alloy phase functions as a binder for binding the granular steel phases with one another and/or for binding the granular steel phases with the back metal layer,
wherein the granular steel phase includes a low perlite phase part in a surface of a steel phase granule, the low perlite phase part having an area ratio of the perlite phase being not more than 50% of a total area ratio of the perlite phase and, if present, the cementite phase in the structure at a central part of the steel phase granule when observed in a cross-section.

2. The sliding member according to claim 1 , wherein the granular steel phase has an average grain size of 45-180 μm.

3. The sliding member according to claim 1 , wherein nickel from the Ni—P alloy phase is diffused into the low perlite phase part.

4. The sliding member according to claim 1 , wherein the low perlite phase part has a thickness of 1-30 μm.

5. The sliding member according to claim 1 , wherein an area ratio of the perlite phase on a surface of the low perlite phase part is 0-10%.

6. The sliding member according to claim 1 , wherein the Ni—P alloy phase has a composition consisting of
9-13 mass % of P,
optionally one or more selected from 1-4 mass % of B, 1-12 mass % of Si, 1-12 mass % of Cr, 1-3 mass % of Fe, 0.5-5 mass % of Sn, and 0.5-5 mass % of Cu, and
the balance of Ni and inevitable impurities.

7. The sliding member according to claim 1 , wherein a ratio of the Ni—P alloy phase in the porous sintered layer is 5-40 part by mass in relation to 100 part by mass of the porous sintered layer.

Assignees

• Daido Metal Co

Inventors

• Iwata Hideki
• Saito Yasushi

Classifications

• F16C2202/52

  Graphite · CPC title

• F16C33/145

  of sintered porous bearings · CPC title

• C10M103/04 Primary

  Metals; Alloys · CPC title

• Y10T428/12958

  Next to Fe-base component · CPC title

• Y10T428/12972

  Containing 0.01-1.7% carbon [i.e., steel] · CPC title