Sliding member

Patent metadata

Field	Value
Publication number	US-10288118-B2
Application number	US-201815915150-A
Country	US
Kind code	B2
Filing date	Mar 8, 2018
Priority date	Mar 8, 2017
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

Provided is a sliding material including a substrate; and a copper alloy layer bonded to the substrate. The copper alloy includes 2.0 to 15.0% by mass of tin. The copper alloy layer includes a sliding body part including a sliding surface, and a gradient region including a bond surface with the substrate. A tin concentration in the gradient region reduces from the sliding body part toward the bond surface. A method for producing the siding material is also provided. The method includes preparing the substrate having a first surface and a second surface opposite to the first surface; melting the copper alloy; casting the molten copper alloy on the first surface of the substrate; and solidifying the copper alloy unidirectionally by cooling the substrate from the second surface by a coolant.

First claim

The invention claimed is:

1. A sliding material comprising:
a substrate; and
a copper alloy layer bonded to the substrate, the copper alloy comprising 2.0 to 15.0% by mass of tin,
wherein the copper alloy layer comprises
a gradient region including a bond surface with the substrate, and
a sliding body part including a surface opposite to the bond surface,

wherein a tin concentration in the gradient region reduces from the sliding body part toward the bond surface, and
wherein a ratio of tin concentration in the gradient region is 0.1 to 0.8 by mass percentage.

2. The sliding material according to claim 1 , wherein the ratio is 0.2 to 0.6.

3. The sliding material according to claim 1 , wherein the copper alloy comprises, by mass,
2.0 to 15.0% of tin,
0 to 30.0% of Bi,
not more than 5.0% in total of one or more elements selected from a group consisting of Al, Zn, Mn, Si, Ni, Fe, P, Zr, Ti and Mg, and
the balance of copper and inevitable impurities.

4. The sliding material according to claim 1 , wherein the copper alloy includes at least one of MoS 2 or graphite, and either or both of the MoS 2 and the graphite is equal to or less than 10.0% by volume.

5. The sliding material according to claim 1 , further comprising an overlay on the copper alloy layer.

6. The sliding material according to claim 1 , wherein the substrate has a thickness of 1.0 to 25.0 mm and the copper alloy layer has a thickness of 0.1 to 3.0 mm.

7. The sliding material according to claim 1 , wherein the gradient region has a thickness of 10 to 50 μm.

8. A sliding member comprising the sliding material according to claim 1 .

9. A bearing device comprising the sliding member according to claim 8 and a shaft.

10. A method for producing the siding material according to claim 1 , comprising:
preparing the substrate having a first surface and a second surface;
melting the copper alloy;
casting the molten copper alloy on the first surface of the substrate; and
solidifying the copper alloy unidirectionally by cooling the substrate from the second surface by a coolant.

11. The method according to claim 10 , wherein further comprising a step of reducing a feeding amount of the coolant after a predetermined time period from the casting.

12. The method according to claim 10 , wherein the coolant is water or oil.

13. The method according to claim 10 ,
wherein the step of preparing the substrate comprises forming a cylindrical body from one or more substrate materials, and
the step of casting comprises casting the molten copper alloy in an inner surface of the cylinder body while rotating the cylindrical body on a central axis of the cylinder.

Assignees

• Daido Metal Co

Inventors

• Toda Kazuaki

Classifications

• Y10T428/1291

  Next to Co-, Cu-, or Ni-base component · CPC title

• C23C30/00

  Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) · CPC title

• Y10T428/264

  Up to 3 mils · CPC title

• F16C2223/44

  by casting molten material on the substrate · CPC title

• C22C9/00 Primary

  Alloys based on copper · CPC title