Shroud and method for implementing abradable coating

Patent metadata

Field	Value
Publication number	US-10465548-B2
Application number	US-201715781996-A
Country	US
Kind code	B2
Filing date	Jan 5, 2017
Priority date	Feb 4, 2016
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A method for implementing an abradable coating comprising: a pattern-forming step in which, using a slurry containing ceramic particles and solvent, a slurry pattern is formed on the surface of a thermal barrier coating layer; and a firing step in which the slurry pattern formed on the surface of the thermal barrier coating layer is fired to form an abradable coating layer. A ceramic material included in the thermal barrier coating layer and ceramic particles included in the abradable coating layer are of the same type.

First claim

The invention claimed is:

1. A method for implementing an abradable coating, the method comprising:
a pattern-forming step of forming a slurry pattern on a surface of a base material by using slurry that contains ceramic particles and a solvent; and
a firing step of forming an abradable coating layer by sintering the slurry pattern that is formed on the surface of the base material,
wherein the base material is a shroud in which a cooling flow passage is formed, and
in the firing step, only a portion of the base material on which the slurry pattern is formed is heated and a cooling medium is made to circulate in the cooling flow passage.

2. The method for implementing an abradable coating according to claim 1 ,
wherein a porous ceramic layer is formed on the surface of the base material, and
in the pattern-forming step, the slurry pattern is formed on the ceramic layer by using the slurry.

3. The method for implementing an abradable coating according to claim 2 ,
wherein a ceramic material contained in the ceramic layer and ceramic particles contained in the abradable coating layer are of the same type.

4. The method for implementing an abradable coating according to claim 1 ,
wherein in the pattern-forming step, while the slurry is discharged to the base material from a nozzle for discharging the slurry, the nozzle is moved by a multi-axis robot to form the slurry pattern.

5. The method for implementing an abradable coating according to claim 1 ,
wherein in the pattern-forming step, the slurry is applied to the surface of the base material and a die member is pressed against the applied slurry to form the slurry pattern.

6. The method for implementing an abradable coating according to claim 1 ,
wherein the ceramic particles include coarse particles having a large particle size and fine particles having a particle size smaller than the particle size of the coarse particle, and
a ratio of the volume of the coarse particles to the volume of the fine particles satisfies a range of “50/50≤V1/V2≤90/10” in a case in which the volume of the coarse particles is denoted by V1 and the volume of the fine particles is denoted by V2.

7. The method for implementing an abradable coating according to claim 6 ,
wherein an average particle size of the coarse particles is in the range of 1 μm to 10 μm, and
an average particle size of the fine particles is in the range of 0.01 μm to 1 μm.

8. The method for implementing an abradable coating according to claim 1 ,
wherein the solvent is water.

Assignees

• Mitsubishi Heavy Ind Aero Engines Ltd

Inventors

• Kurimura Takayuki
• Matsumoto Mineaki
• Hanada Tadayuki
• Tamugi Azusa

Classifications

• C23C24/082

  without intermediate formation of a liquid in the layer · CPC title

• B05D3/02

  by baking {(B05D3/04 takes precedence)} · CPC title

• C23C4/01

  Selective coating, e.g. pattern coating, without pre-treatment of the material to be coated · CPC title

• C23C24/08

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

• B05D7/24

  for applying particular liquids or other fluent materials · CPC title