Substrate edge configurations for ceramic coatings
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.
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 face; and
drawing the rotating bit down the first 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 along the first face 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 further comprising:
plunge end milling to form the plurality of first recesses in the pattern along the first face.
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 surface between the first circumferential end and the inner diameter surface;
a second bevel surface between the second circumferential end and the inner diameter surface;
said plurality of first channels along the first bevel surface extending from the inner diameter surface to the first circumferential end; and
a plurality of second channels along the second bevel surface 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 surface is at first circumferential end of the body; and
the body has a second circumferential end and a second bevel surface 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.
16. The method of claim 9 wherein:
the plunge end milling is with a first said rotating bit used for said machining of each of the first group of first channels; and
said machining of the second group of first channels is with a second said rotating bit smaller than the first said rotating bit.
17. The method of claim 16 wherein the machining each of the first channels further comprises:
between the plunging and the drawing, turning the bit transverse to its rotation.
18. The method of claim 17 wherein:
the ceramic coating comprises a stabilized zirconia and is applied by air plasma spray.