Sprayed coating and sprayed-coating manufacturing method

Patent metadata

Field	Value
Publication number	US-2023265551-A1
Application number	US-202018041956-A
Country	US
Kind code	A1
Filing date	Sep 2, 2020
Priority date	Sep 2, 2020
Publication date	Aug 24, 2023
Grant date	—

Abstract

The present invention provides a thermally sprayed coating that is a thermally sprayed iron-based coating formed on an inner circumferential surface of a cylinder bore of an aluminum or aluminum alloy cylinder block. The thermally sprayed coating has a plastic deformation part on its surface. Thus, pores on the surface of the thermally sprayed coating are reduced, resulting in a reduction in the amount of oil consumption.

First claim

1 - 6 . (canceled)

7 . A thermally sprayed coating being a thermally sprayed iron-based coating that is formed on an inner circumferential surface of a cylinder bore of an aluminum or aluminum alloy cylinder block, the thermally sprayed coating having a plastic deformation part on its surface, wherein an area ratio of the plastic deformation part is 4.6% or greater, and a surface roughness (Ra) of the thermally sprayed coating is 0.1 µm or less.

8 . The thermally sprayed coating according to claim 7 , having a hardness of 3.9 GPa to 9.1 GPa.

9 . A method for manufacturing a thermally sprayed coating by forming a thermally sprayed iron-based coating on an inner circumferential surface of an aluminum or aluminum alloy cylinder block, the method comprising:
a thermal spraying step comprising forming a thermally sprayed coating; a mirror polishing step comprising mirror polishing a surface of the thermally sprayed coating; and a finishing step comprising causing plastic flow on the surface of the thermally sprayed coating to form a plastic deformation part, wherein the finishing step is performed such that an area ratio of the plastic deformation part is 4.6% or greater, and a surface roughness (Ra) of the thermally sprayed coating is caused to be 0.1 µm or less by using a whetstone that is a honing stone on which diamond abrasive grains are bonded with Cu-Sn alloy having a hardness of 380 to 480 HV.

10 . The method for manufacturing the thermally sprayed coating according to claim 9 , wherein the finishing step is performed so that an area ratio of the plastic deformation part does not exceed 11.4%.

Assignees

• Nissan Motor

Inventors

• Hirayama Hayato
• Higuchi Tsuyoshi
• Utsumi Yoshito

Classifications

• C23C4/14 Primary

  for coating elongate material · CPC title

• C23C4/08

  containing only metal elements (C23C4/073 takes precedence) · CPC title

• F02F1/18 Primary

  Other cylinders · CPC title

• F02F1/00

  Cylinders; Cylinder heads · CPC title

• F16J10/04

  Running faces; Liners · CPC title