Part coated with a coating for protection against CMAS

Patent metadata

Field	Value
Publication number	US-10941083-B2
Application number	US-201615741857-A
Country	US
Kind code	B2
Filing date	Jul 8, 2016
Priority date	Jul 8, 2015
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

A part coated in a protective coating forms a thermal barrier and includes a ceramic first layer. The protective coating further includes a second layer present on the first layer and including a majority by weight of a first feldspar mineral having a melting temperature higher than or equal to 1010° C. and presenting a thickness greater than or equal to 10 μm.

First claim

The invention claimed is:

1. A coated part comprising a metallic and/or intermetallic substrate and a protective coating forming a thermal barrier covering said substrate,
wherein the protective coating comprises a ceramic first layer and wherein the protective coating further comprises a second layer present on the first layer, the second layer comprising a majority by weight of a first feldspar mineral having a melting temperature higher than or equal to 1010° C. and presenting a thickness greater than or equal to 10 μm, wherein the second layer presents a degree of crystallinity that is greater than or equal to 5%,
and wherein the coating further comprises a third layer covering the second layer and comprising alumina and/or titanium oxide.

2. A part according to claim 1 , wherein the second layer presents a thickness greater than or equal to 20 μm.

3. A part according to claim 1 , wherein the ceramic first layer comprises zirconia.

4. A part according to claim 3 , wherein the ceramic first layer comprises yttrium-stabilized zirconia.

5. A part according to claim 1 , wherein the second layer comprises a majority by weight of anorthite.

6. A part according to claim 1 , wherein the coating further comprises a fourth layer comprising a majority by weight of a second feldspar mineral having a melting temperature greater than or equal to 1010° C., the fourth layer being situated under the first layer.

7. A part according to claim 1 , wherein the second layer further comprises alumina and/or titanium oxide.

8. A method of fabricating a coated part comprising a metallic and/or intermetallic substrate and a protective coating forming a thermal barrier covering said substrate, the method comprising
forming a ceramic first layer on the metallic and/or intermetallic substrate,
forming a second layer on the ceramic first layer, the second layer comprising a majority by weight of a feldspar mineral having a melting temperature higher than or equal to 1010° C. and presenting a thickness greater than or equal to 10 μm, wherein the second layer presents a degree of crystallinity that is greater than or equal to 5%, and
forming a third layer covering the second layer and comprising alumina and/or titanium oxide.

9. A method of using a coated part according to claim 1 , comprising using the part in an oxidizing environment at a temperature higher than 1000° C. and in the presence of aluminosilicates of calcium and of magnesium.

Assignees

• Safran Aircraft Engines

Inventors

• Bilhe Pascal Fabrice
• MALIE ANDRé HUBERT LOUIS

Classifications

• C23C14/08 Primary

  Oxides (C23C14/10 takes precedence) · CPC title

• C04B35/195

  Alkaline earth aluminosilicates, e.g. cordierite {or anorthite} · CPC title

• F01D5/288

  Protective coatings for blades · 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

• C23C28/042

  including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides · CPC title