Method for applying a coating to a substrate

Patent metadata

Field	Value
Publication number	US-2016138168-A1
Application number	US-201615006628-A
Country	US
Kind code	A1
Filing date	Jan 26, 2016
Priority date	Jan 31, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

A method for applying a coating to a substrate surface is provided. The method involves cold spraying a coating material against the surface of the substrate at a first velocity. The first velocity is lower in magnitude than a critical velocity. The method also involves cold spraying the coating material against the surface of the substrate at a second velocity. The second velocity is greater in magnitude than the critical velocity. The critical velocity is a threshold velocity below which the coating material is substantially deflected by the surface of the substrate and above which the coating material substantially adheres to the surface of the substrate.

First claim

1 . A method for applying a coating to a substrate surface, the method comprising cold spraying a coating material against the substrate surface at a first velocity below a critical velocity to modify the adhesion properties of the surface, the critical velocity being a minimum velocity which results in adherence of the coating material to the surface, and then cold spraying the coating material against the surface at a second velocity above the critical velocity to coat the surface with the material.

2 . A method as defined in claim 1 , wherein cold spraying the coating material at the second velocity comprises cold spraying the coating material after a time delay, the time delay being a maximum of about twenty-five minutes.

3 . A method as defined in claim 1 , wherein cold spraying the coating material comprises cold spraying the coating material at an angle of about 90° to the substrate surface.

4 . A method as defined in claim 1 , wherein cold spraying the coating material comprises cold spraying a powder coating material, the powder coating material having an average particle size, the average particle size of the powder coating material being substantially the same at the first and second velocity.

5 . A method as defined in claim 1 , wherein cold spraying the coating material comprises cold spraying substantially pure nickel powder at the first and second velocity.

6 . A method as defined in claim 1 , further comprising determining the critical velocity, wherein determining the critical velocity comprises cold spraying the coating material against multiple samples of the surface, each sample being cold sprayed at a different velocity.

7 . A method as defined in claim 6 , wherein determining the critical velocity further comprises analyzing each sample of the surface to determine a percentage of particles of the coating material having adhered to said sample, and comparing the percentage of particles to a threshold percentage value.

8 . A method as defined in claim 1 , further comprising shot-peening the substrate surface prior to cold spraying the coating material at the first velocity.

Assignees

• Pratt & Whitney Canada
• Nat Res Council Canada

Inventors

• Verrier Pierre
• Irissou Eric
• Belval Frederic
• Legoux Jean-Gabriel

Classifications

• C23C24/04 Primary

  Impact or kinetic deposition of particles · CPC title

• G01N13/00

  Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects (scanning-probe techniques or apparatus G01Q) · CPC title