Heat-resistant member provided with heat-shielding coating, and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2017284333-A1
Application number	US-201515510986-A
Country	US
Kind code	A1
Filing date	Nov 11, 2015
Priority date	Nov 14, 2014
Publication date	Oct 5, 2017
Grant date	—

Abstract

Provided are a heat-resistant member provided with a heat-shielding coating suitable for stable manufacturing and excellent in heat-insulating, thermoresponsive and distortion accommodating properties, and a method for manufacturing the same. The heat-shielding coating includes a metallic portion formed of agglomerates of a plurality of metal particles, and inorganic compound particles dispersed in the metallic portion. The metal particles are diffusion-bonded each other, and the metallic portion and a base material of the heat-resistant member are diffusion-bonded each other. The manufacturing method includes the steps of depositing mixed particles of the metal particles and the inorganic compound particles on a surface of the base material in a film shape; resistance-heating the mixed particles by current-passing while pressurized in a thickness direction; diffusion-bonding the metal particles each other; and the metallic portion and the base material each other.

First claim

1 . A heat-resistant member provided with a heat-shielding coating, the heat-shielding coating comprising;
a metallic portion formed of agglomerates of a plurality of metal particles; and inorganic compound particles dispersed in the metallic portion, wherein the metal particles are bonded each other via diffusion-bonding, and the metallic portion and a base material of the heat-resistant member are bonded each other via diffusion bonding.

2 . The heat-resistant member according to claim 1 , wherein the plurality of metal particles are bonded each other leaving pores in the metallic portion.

3 . The heat-resistant member according to claim 1 , wherein the inorganic compound particles are comprised of hollow inorganic compound particles each having a hollow structure, or a combination of hollow inorganic compound particles and solid inorganic compound particles each having a solid structure.

4 . The heat-resistant member according to claim 1 , wherein
the heat-shielding coating further comprises an intermediate layer formed of an intermetallic compound between the metallic portion and the base material, and the metallic portion and the base material are bonded across the intermediate layer.

5 . The heat-resistant member according to claim 1 , wherein the metal particles have a mean particle diameter which is at most one-third time as large as a mean particle diameter of the inorganic compound particles.

6 . The heat-resistant member according to claim 1 , wherein the metal particles have a mean particle diameter which is at most one-tenth time as large as a mean particle diameter of the inorganic compound particles.

7 . The heat-resistant member according to claim 1 , wherein the inorganic compound particles have a volume fraction ranging from 10% to 65% in the metallic portion.

8 . The heat-resistant member according to claim 1 , wherein the inorganic compound particles have a volume fraction gradiently changed in a thickness direction of the heat-shielding coating.

9 . The heat-resistant member according to claim 1 , wherein the heat-shielding coating further comprises a coating layer placed on a surface of the metallic portion opposite to the base material.

10 . The heat-resistant member according to claim 1 , wherein the heat-shielding coating has a thickness ranging from 0.1 mm to 5 mm.

11 . A piston of an internal combustion engine, wherein in the heat-resistant member according to claim 1 , the base material is the piston, and the heat-shielding coating is formed on a piston head.

12 . The piston of the internal combustion engine according to claim 11 , wherein
the base material is the piston made of aluminum or an aluminum alloy, the plurality of metal particles included in the heat-shielding coating are made of one selected from aluminum, an aluminum alloy, nickel and a nickel alloy.

13 . A method for manufacturing a heat-resistant member, comprising the steps of:
depositing mixed particles comprised of a plurality of metal particles and inorganic compound particles in a film shape onto a surface of a base material; resistance-heating the mixed particles thus deposited in the film shape via subjected to current-passing with pressurized in a thickness direction; and diffusion-bonding the metal particles each other, and the base material and a metallic portion formed of agglomerates of the plurality of metal particles each other.

Assignees

• Hitachi Ltd

Inventors

• Kawanaka Hirotsugu
• SUGIMOTO Ittou

Classifications

• C23C24/08

  by application of heat or pressure and heat (C23C24/04 takes precedence) · CPC title

• F02B77/02

  Surface coverings of combustion-gas-swept parts (of pistons F02F3/10; of cylinders and cylinder heads F02F1/00) · CPC title

• F02F3/14

  within combustion chambers · 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

• B22F5/008

  of engine cylinder parts or of piston parts other than piston rings (of piston rings B22F5/02) · CPC title