Substrate Edge Configurations for Ceramic Coatings

Patent metadata

Field	Value
Publication number	US-2021355838-A1
Application number	US-202117385003-A
Country	US
Kind code	A1
Filing date	Jul 26, 2021
Priority date	Nov 8, 2018
Publication date	Nov 18, 2021
Grant date	—

Abstract

In a method for manufacturing an article, the article has a body having: a first face; and a first bevel surface extending from the first face. A plurality of first channels along the first bevel surface extending from the first face. A ceramic coating is along the inner diameter surface and the first bevel surface. Each of the first channels are machined in the body by plunging a rotating bit into the first surface and drawing the rotating bit down the bevel surface. The coating is thereafter applied.

First claim

What is claimed is:

1 . A method for manufacturing an article, the article comprising:
a body having:
a first face; and
a first bevel surface extending from the first face; and
a plurality of first channels along the first bevel surface extending from the first face; and
a ceramic coating along the first face and the first bevel surface, the method comprising: machining each of the first channels in the body by:
plunging a rotating bit into the first surface; and
drawing the rotating bit down the bevel surface; and
applying the coating.

2 . The method of claim 1 wherein the article is a gas turbine engine component.

3 . The method of claim 1 wherein:
the ceramic coating comprises a stabilized zirconia.

4 . The method of claim 1 wherein:
the body is metallic.

5 . The method of claim 4 wherein:
the body comprises a metallic substrate and a metallic bondcoat.

6 . The method of claim 5 wherein:
the metallic substrate is a nickel-based superalloy; and
the ceramic coating comprises a stabilized zirconia.

7 . The method of claim 1 wherein:
the body has:
a plurality of first recesses in a pattern along the first face;

the first channels comprise a first group of channels and a second group of channels:
the channels of the first group being of different size than the channels of the second group; and
the channels of the first group being of different registry with the pattern than are the channels of the second group.

8 . The method of claim 7 wherein:
the pattern is a hexagonal array; and
the hexagonal array has a first row along the first bevel surface;
the channels of the first group are longer than the channels of the second group;
the channels of the first group are in-phase with the recesses of the first row; and
the channels of the second group are out-of-phase with the recesses of the first row.

9 . The method of claim 7 comprising:
plunge end milling to form the plurality of first recesses.

10 . The method of claim 1 wherein the article is a blade outer airseal wherein:
the first face is a transversely concave inner diameter surface;
the body comprises:
a first circumferential end;
a second circumferential end; a first axial end;
a second axial end;
said first bevel between the first circumferential end and the inner diameter surface;
a second bevel between the second circumferential end and the inner diameter surface;
said plurality of first channels along the first bevel extending from the inner diameter surface to the first circumferential end; and
a plurality of second channels along the second bevel extending from the inner diameter surface to the second circumferential end; and

said ceramic coating along the inner diameter surface, the first bevel surface, and the second bevel surface.

11 . The method outer airseal of claim 10 wherein:
the body has:
a plurality of first recesses along the inner diameter surface.

12 . The method outer airseal of claim 10 wherein:
the ceramic has a by weight majority of at least one of YSZ and GSZ.

13 . The method of claim 1 wherein:
the first bevel is at first circumferential end of the body; and
the body has a second circumferential end and a second bevel extending from the first face to the second circumferential end.

14 . The method of claim 1 further comprising:
grinding the coating to remove artifacts of the first channels.

15 . The method of claim 1 wherein the machining each of the first channels further comprises:
between the plunging and the drawing, turning the bit transverse to its rotation.

Assignees

• Raytheon Tech Corp

Inventors

• Strock Christopher W

Classifications

• F23R2900/03044

  Impingement cooled combustion chamber walls or subassemblies · CPC title

• B23P15/04

  turbine or like blades from several pieces · CPC title

• F05D2230/14

  Micromachining · CPC title

• F05D2250/191

  perforated · CPC title

• F05D2250/192

  bevelled · CPC title