Sliding member

Patent metadata

Field	Value
Publication number	US-10955003-B2
Application number	US-201916276749-A
Country	US
Kind code	B2
Filing date	Feb 15, 2019
Priority date	Mar 27, 2018
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

Provided is a sliding member including: a back-metal layer and a sliding layer including a copper alloy. The back-metal layer includes a hypoeutectoid steel including 0.07 to 0.35 mass % of carbon and has a structure including a ferrite phase and pearlite. The back-metal layer has a high ferrite phase portion at a bonding surface between the back-metal layer and the sliding layer. A volume ratio Pc and a volume ratio Ps satisfy Ps/Pc≤0.4, where the volume ratio Pc is a volume ratio of pearlite in the structure at a center portion in a thickness direction of the back-metal layer, and the volume ratio Ps is a volume ratio of pearlite in the high ferrite phase portion.

First claim

The invention claimed is:

1. A sliding member comprising:
a back-metal layer having a back surface and a bonding surface; and
a sliding layer comprising a copper alloy on the bonding surface of the back-metal layer,
wherein the back-metal layer comprises a hypoeutectoid steel including 0.07 to 0.35 mass % of carbon and has a structure comprising a ferrite phase and pearlite,
wherein the back-metal layer comprises a high ferrite phase portion at the bonding surface, and
wherein a volume ratio Pc and a volume ratio Ps satisfy
Ps/Pc≤ 0.4

where the volume ratio Pc is a volume ratio of pearlite in the structure at a center portion in a thickness direction of the back-metal layer, and the volume ratio Ps is a volume ratio of pearlite in the high ferrite phase portion, and
wherein the back-metal layer consists of 0.07 to 0.35 mass % of C, not more than 0.4 mass % of Si, not more than 1 mass % of Mn, not more than 0.04 mass % of P, not more than 0.05 mass % of S, and a balance of Fe and inevitable impurities.

2. The sliding member according to claim 1 , wherein the high ferrite phase portion has a thickness T1 of 1 to 50 μm.

3. The sliding member according to claim 1 , wherein a ratio X1 of a thickness T1 of the high ferrite phase portion in relation to a thickness T of the back-metal layer is not more than 0.07.

4. The sliding member according to claim 1 , wherein the copper alloy comprises 0.5 to 12 mass % of Sn, 0.01 to 0.2 mass % of P, and the balance of Cu and inevitable impurities.

5. The sliding member according to claim 4 , wherein the copper alloy further includes one or more elements selected from 0.1 to 15 mass % of Ni, 0.5 to 10 mass % of Fe, 0.01 to 5 mass % of Al, 0.01 to 5 mass % of Si, 0.1 to 5 mass % of Mn, 0.1 to 30 mass % of Zn, 0.1 to 5 mass % of Sb, 0.1 to 5 mass % of In, 0.1 to 5 mass % of Ag, 0.5 to 25 mass % of Pb, and 0.5 to 20 mass % of Bi.

6. The sliding member according to claim 1 , wherein the sliding layer further includes 0.1 to 10 volume % of hard particles composed of one or more selected from Al 2 O 3 , SiO 2 , AlN, Mo 2 C, WC, Fe 2 P, and Fe 3 P, the hard particles being dispersed in a matrix of the copper alloy.

7. The sliding member according to claim 1 , wherein, the sliding layer further includes 0.1 to 10 volume % of a solid lubricant composed of one or more selected from MoS 2 , WS 2 , graphite, and h-BN, the lubricant being dispersed in a matrix of the copper alloy.

Assignees

• Daido Metal Co

Inventors

• Ikegami Asako
• Kitahara Takaaki

Classifications

• F16C2204/74

  with manganese as the next major constituent · CPC title

• F16C2204/16

  with lead as the next major constituent · CPC title

• F16C33/128

  Porous bearings, e.g. bushes of sintered alloy · CPC title

• F16C2204/18

  with bismuth as the next major constituent · CPC title

• F16C33/127 Primary

  Details of intermediate layers, e.g. nickel dams · CPC title