Sliding member

Patent metadata

Field	Value
Publication number	US-9360048-B2
Application number	US-201514663566-A
Country	US
Kind code	B2
Filing date	Mar 20, 2015
Priority date	Mar 24, 2014
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

Provided is a sliding member including a steel back metal layer and a sliding layer with a porous sintered layer and a resin composition. The porous sintered layer includes granular Fe or Fe alloy phase and Ni—P alloy phase for binding the Fe or Fe alloy phase grains with one another. The steel back metal layer is made of a carbon steel including 0.05-0.3 mass % of carbon and having a structure composed of ferrite phase and pearlite phase, and includes a low pearlite phase part in a surface thereof on a side of the sliding layer. The low pearlite phase part has a ratio of the pearlite phase is lowered by 50% or more compared with the pearlite phase at a central part in a thickness direction of the steel back metal layer. The Ni—P alloy phase may cover the entire surface of the steel back metal layer.

First claim

The invention claimed is:

1. A sliding member comprising a steel back metal layer and a sliding layer, the sliding layer including a porous sintered layer and a resin composition,
wherein the porous sintered layer includes granular Fe or Fe alloy phase and Ni—P alloy phase functioning as a binder for binding the Fe or Fe alloy phase grains with one another,
wherein the steel back metal layer is made of a carbon steel including 0.05-0.3 mass % of carbon and having a structure composed of ferrite phase and pearlite phase, and
wherein the steel back metal layer includes a low pearlite phase part in a surface thereof on a side of the sliding layer, the low pearlite phase part having a ratio of the pearlite phase lowered by 50% or more compared with the pearlite phase at a central part in a thickness direction of the steel back metal layer.

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

3. The sliding member according to claim 1 , wherein the low pearlite phase part has a thickness of 1-50 μm.

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

5. The sliding member according to claim 1 , wherein the Ni—P alloy phase comprises 9-13 mass % of P and the balance being Ni and inevitable impurities.

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

7. The sliding member according to claim 1 , wherein the Ni—P alloy phase covers the entire surface of the steel back metal layer on a side of the sliding layer as well as binds the Fe or Fe alloy phase grains with one another.

8. The sliding member according to claim 7 , wherein nickel is diffused into the low pearlite phase part from the Ni—P alloy phase.

9. The sliding member according to claim 7 , wherein the low pearlite phase part has a thickness of 1-50 μm.

10. The sliding member according to claim 7 , wherein an area ratio of pearlite phase on a surface of the low pearlite phase part is 0-10%.

11. The sliding member according to claim 7 , wherein the Ni—P alloy phase comprises 9-13 mass % of P and the balance being Ni and inevitable impurities.

12. The sliding member according to claim 7 , wherein the porous sintered layer has a ratio of the Ni—P alloy phase such that the Ni—P alloy phase has 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

• C22C19/03 Primary

  based on nickel · CPC title

• Y10T428/12965

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

• Y10T428/12944

  Ni-base component · CPC title

• F16C33/22

  Sliding surface consisting mainly of rubber or synthetic rubber (F16C33/24 - F16C33/28 take precedence) · CPC title

• Y10T428/12979

  Containing more than 10% nonferrous elements [e.g., high alloy, stainless] · CPC title