Sliding member

Patent metadata

Field	Value
Publication number	US-2021293158-A1
Application number	US-201817260308-A
Country	US
Kind code	A1
Filing date	Jul 19, 2018
Priority date	Jul 19, 2018
Publication date	Sep 23, 2021
Grant date	—

Abstract

A sliding member of the present invention includes a coating on a base material. The coating contains hard metal particles and corrosion-resistant metal particles that have hardness lower than that of the hard metal particles. The hard metal particles contain particles that have at least Vickers hardness of 600 Hv or higher. The corrosion-resistant metal particles are made of at least one kind of metal selected from the group consisting of copper (Cu), cobalt (Co), chromium (Cr), and nickel (Ni), or are made of an alloy containing said metal. The coating has a cross section in which the hard metal particles are dispersed in an island manner in a particle aggregate of the corrosion-resistant metal particles and in which an area ratio of the corrosion-resistant metal particles is 30% or larger. Thus, corrosion of the hard metal particles in the coating is prevented, whereby the sliding member maintains wear resistance for a long time.

First claim

1 . A sliding member comprising a coating on a base material,
the coating containing hard metal particles and corrosion-resistant metal particles that have hardness lower than hardness of the hard metal particles, the hard metal particles containing particles that have at least Vickers hardness of 600 Hv or higher, the corrosion-resistant metal particles being made of at least one kind of metal selected from a group consisting of copper (Cu), cobalt (Co), chromium (Cr), and nickel (Ni), or being made of an alloy containing said metal, the coating having a cross section in which the hard metal particles are dispersed in an island manner in a particle aggregate of the corrosion-resistant metal particles and in which an area ratio of the corrosion-resistant metal particles is 30% or larger.

2 . The sliding member according to claim 1 , wherein the hard metal particles are made of at least one kind of metal selected from a group consisting of cobalt (Co), chromium (Cr), and nickel (Ni), or are made of an alloy containing said metal, and
the Vickers hardness of the hard metal particles is 700 Hv or higher.

3 . The sliding member according to claim 1 , wherein the area ratio of the corrosion-resistant metal particles is 50% or larger.

4 . The sliding member according to claim 1 , wherein the area ratio of the corrosion-resistant metal particles is 80% or larger.

5 . The sliding member according to claim 1 , wherein an area ratio of the hard metal particles is 5% or larger and 50% or smaller.

6 . The sliding member according to claim 1 , including an amorphous substance at least at a part of an interface between the corrosion-resistant metal particles and an interface between the corrosion-resistant metal particle and the hard metal particle.

7 . The sliding member according to claim 1 , wherein a void content is 10 area % or smaller.

8 . The sliding member according to claim 1 , wherein the void content is 5 area % or smaller.

9 . The sliding member according to claim 1 , wherein a void is an independent void.

10 . The sliding member according to claim 1 , wherein the coating has a natural potential of −600 mV or higher.

11 . The sliding member according to claim 1 , wherein the coating has a natural potential of 0 mV or higher.

12 . The sliding member according to claim 1 , wherein a relative difference in natural potential between the coating and the base material is 1100 mV or smaller.

13 . The sliding member according to claim 1 , wherein the base material is made of an aluminum alloy.

Assignees

• Nissan Motor

Inventors

• Izawa Yoshinori
• Mabuchi Yutaka
• Itou Akinobu
• Arai Junichi
• Mogami Misao
• Harada Masanao
• Nogami Moriyuki

Classifications

• B22F2007/042

  characterised by the layer forming method · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B22F7/08

  with one or more parts not made from powder {(B22F7/062 takes precedence)} · CPC title

• C22C33/02

  by powder metallurgy · CPC title

• F01L3/02

  Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials · CPC title