Thermal sprayed coating for sliding member, and sliding device provided with thermal sprayed coating for sliding member

Patent metadata

Field	Value
Publication number	US-11746405-B2
Application number	US-201817289869-A
Country	US
Kind code	B2
Filing date	Nov 2, 2018
Priority date	Nov 2, 2018
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

A sprayed coating for a sliding member of the present invention includes a ferrous alloy containing iron (Fe) as a major ingredient.
The sprayed coating for the sliding member containing 10 mass % or more and 20 mass % or less of chromium (Cr), and 0.1 mass % or more and 0.5 mass % or less of silicon (Si) and having the content rate of an oxide in the sprayed coating of 1 area % or less has corrosion resistance with improved seizure resistance.

First claim

The invention claimed is:

1. A thermal sprayed coating for a sliding member, the thermal sprayed coating comprising:
an iron-based alloy containing chromium (Cr) and silicon (Si), wherein:
a content of iron (Fe) is 59.76 mass % or more,
a content of chromium (Cr) is 10 mass % or more and 20 mass % or less,
a content of silicon (Si) is 0.1 mass % or more and less than 0.5 mass %, and
a ratio of an oxide in a cross section of the thermal sprayed coating is 1 area % or less.

2. A thermal sprayed coating for a sliding member, the thermal sprayed coating comprising:
an iron-based alloy containing chromium (Cr) and silicon (Si), wherein:
a content of iron (Fe) is 59.76 mass % or more,
a content of chromium (Cr) is 10 mass % or more and 20 mass % or less,
a content of silicon (Si) is 0.1 mass % or more and 0.5 mass % or less,
a content of carbon (C) is less than 0.1 mass %, and
a ratio of an oxide in a cross section of the thermal sprayed coating is 1 area % or less.

3. The thermal sprayed coating for a sliding member according to claim 1 , containing manganese (Mn) at a ratio of 0.6 mass % or less.

4. The thermal sprayed coating for a sliding member according to claim 1 , containing manganese (Mn) at a ratio of 3 mass % or more.

5. A sliding device comprising:
a sliding member; and
a mating member, wherein:
each of the sliding member and the mating member comprises a base material, and a coating on the base material,
the coating of the mating member is a hard carbon film, and
the coating of the sliding member is the thermal sprayed coating for a sliding member according to claim 1 .

6. The sliding device according to claim 5 , wherein the hard carbon film contains 95 mass % or more of carbon (C).

7. The sliding device according to claim 5 , wherein the base material of the sliding member and/or the mating member is aluminum or aluminum alloy.

8. The sliding device according to claim 5 , wherein the sliding member is a piston, and the mating member is a cylinder block.

9. The thermal sprayed coating for a sliding member according to claim 2 , containing manganese (Mn) at a ratio of 0.6 mass % or less.

10. The thermal sprayed coating for a sliding member according to claim 2 , containing manganese (Mn) at a ratio of 3 mass % or more.

11. A sliding device comprising:
a sliding member; and
a mating member, wherein:
each of the sliding member and the mating member comprises a base material, and a coating on the base material,
the coating of the mating member is a hard carbon film, and
the coating of the sliding member is the thermal sprayed coating for a sliding member according to claim 9 .

12. The sliding device according to claim 11 , wherein the hard carbon film contains 95 mass % or more of carbon (C).

13. The sliding device according to claim 11 , wherein the base material of the sliding member and/or the mating member is aluminum or aluminum alloy.

14. The sliding device according to claim 11 , wherein the sliding member is a piston, and the mating member is a cylinder block.

15. The thermal sprayed coating for a sliding member according to claim 1 , wherein the iron-based alloy is an alloy containing iron as a main component.

Assignees

• Nissan Motor

Inventors

• Higuchi Tsuyoshi
• Hirayama Hayato
• Itou Akinobu

Classifications

• C23C4/073 Primary

  containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-metal elements · CPC title

• C23C4/16

  Wires; Tubes · CPC title

• F02F1/00

  Cylinders; Cylinder heads · CPC title

• F02F3/0084

  the pistons being constructed from specific materials · CPC title

• F02F3/10

  having surface coverings (F02F3/02 takes precedence) · CPC title