Slide member

Patent metadata

Field	Value
Publication number	US-2023228296-A1
Application number	US-202318153393-A
Country	US
Kind code	A1
Filing date	Jan 12, 2023
Priority date	Jan 17, 2022
Publication date	Jul 20, 2023
Grant date	—

Abstract

A sliding member includes a bearing alloy layer and an overlay. The overlay includes a diffusion prevention layer on the bearing alloy layer, and a corrosion prevention layer on the diffusion prevention layer. A surface of the corrosion prevention layer is a sliding surface. The corrosion prevention layer constitutes 50% to 90% of an entire volume of the overlay. The corrosion prevention layer and the diffusion prevention layer each include a corrosion inhibitor and the balance of Bi and inevitable impurities. The corrosion inhibitor is defined as one or more elements that have a higher oxygen affinity than Bi and that form an alloy, a solid solution or an intermetallic compound with Bi. An average concentration of the corrosion inhibitor included in the diffusion prevention layer is lower than an average concentration of the corrosion inhibitor included in the corrosion prevention layer.

First claim

1 . A sliding member comprising
a bearing alloy layer, and an overlay on the bearing alloy layer, wherein the overlay comprises a diffusion prevention layer on the bearing alloy layer, and a corrosion prevention layer on the diffusion prevention layer, the corrosion prevention layer having a sliding surface, wherein the corrosion prevention layer constitutes 50% to 90% of an entire volume of the overlay, wherein the corrosion prevention layer and the diffusion prevention layer each comprise: a corrosion inhibitor; and the balance of Bi and inevitable impurities, the corrosion inhibitor being one or more elements that have a higher oxygen affinity than Bi and that form an alloy, a solid solution or an intermetallic compound with Bi, and wherein an average concentration of the corrosion inhibitor in the diffusion prevention layer is lower than an average concentration of the corrosion inhibitor in the corrosion prevention layer.

2 . The sliding member according to claim 1 , wherein a difference between the average concentration of the corrosion inhibitor in the diffusion prevention layer and the average concentration of the corrosion inhibitor in the corrosion prevention layer is not less than 1.0 mass %.

3 . The sliding member according to claim 1 , wherein the average concentration of the corrosion inhibitor in the corrosion prevention layer is 3.0 mass % to 20.0 mass %.

4 . The sliding member according to claim 1 , wherein the average concentration of the corrosion inhibitor in the diffusion prevention layer is 1.0 mass % to 8.0 mass %.

5 . The sliding member according to claim 1 , wherein the corrosion inhibitor is at least one element selected from Sn, Cu, Zn, In, Sb and Ag.

6 . The sliding member according to claim 5 , wherein the corrosion inhibitor is a combination of Sb and at least one selected from Sn, Cu, Zn, In and Ag.

7 . The sliding member according to claim 5 , wherein the corrosion inhibitor is Sb.

8 . The sliding member according to claim 1 , wherein the overlay further comprises hard particles.

9 . The sliding member according to claim 1 , wherein the overlay further comprises a lubricant.

10 . The sliding member according to claim 1 , further comprising a back-metal layer,
wherein the bearing alloy layer is located on the back-metal layer.

11 . The sliding member according to claim 1 , wherein the sliding member is a sliding bearing.

12 . A bearing device comprising the sliding member according to claim 1 .

13 . An internal combustion engine comprising the bearing device according to claim 12 .

Assignees

• Daido Metal Co

Inventors

• Shiroya Tomoyasu
• Ando Akira

Classifications

• F16C17/02 Primary

  for radial load only · CPC title

• F16C2360/22

  Internal combustion engines · CPC title

• F16C33/121

  Use of special materials · CPC title

• F16C17/04

  for axial load only · CPC title

• F16C17/10

  for both radial and axial load · CPC title