Yttrium aluminum garnet based thermal barrier coatings

Patent metadata

Field	Value
Publication number	US-10472286-B2
Application number	US-201615040871-A
Country	US
Kind code	B2
Filing date	Feb 10, 2016
Priority date	Feb 10, 2015
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

Embodiments of a microstructure that allows arrest of contaminant infiltration includes an inter layer and at least one highly reactive ceramic layer. The inter layer is not reactive to an infiltrating reactive species. The HRC layer includes materials that react with a reactive contaminant species to slow or arrest infiltration of such contaminant species.

First claim

What is claimed is:

1. A microstructure to arrest contaminant infiltration comprising:
at least one inter layer, wherein the inter layer is not reactive to an infiltrating contaminant species, wherein the inter layer comprises at least two layers of YAG; and
a highly reactive ceramic layer (HRC layer), wherein the HRC layer comprises materials that react with the infiltrating contaminant species to slow or arrest infiltration of the infiltrating contaminant species, wherein the HRC layer comprises:
a layer comprising Y 2 O 3 between the at least two layers of YAG; and
a layer comprising Gd 2 Zr 2 O 7 between the at least two layers of YAG; and

another layer of YAG between the at least two layers of YAG and also between the layers comprising Y 2 O 3 and Gd 2 Zr 2 O 7 .

2. The microstructure of claim 1 , further comprising at least one additional inert layer or at least one additional HRC layer.

3. A microstructure to arrest contaminant infiltration comprising:
at least one inter layer, wherein the inter layer is not reactive to an infiltrating contaminant species, wherein the inter layer comprises layers of YAG; and
a highly reactive ceramic layer (HRC layer), wherein the HRC layer comprises materials that react with the infiltrating contaminant species to slow or arrest infiltration of the infiltrating contaminant species, wherein the HRC layer comprises a first layer of Y 2 O 3 +Gd 2 Zr 2 O 7 between layers of YAG and a second layer of Y 2 O 3 +Gd 2 Zr 2 O 7 between the layers of YAG.

4. The microstructure of claim 3 , further comprising at least one additional inert layer or at least one additional HRC layer.

5. A microstructure to arrest contaminant infiltration, the microstructure comprising:
a plurality of layers of YAG;
a layer comprising Y 2 O 3 between two of the plurality of YAG; and
a layer comprising Gd 2 Zr 2 O 7 between two of the layers of YAG.

6. The microstructure of claim 5 , further comprising an additional layer of YAG between the layers comprising Y 2 O 3 and Gd 2 Zr 2 O 7 .

7. The microstructure of claim 5 , wherein the layer comprising Y 2 O 3 is separate from the layer comprising Gd 2 Zr 2 O 7 .

8. The microstructure of claim 5 , wherein:
the layer comprising Y 2 O 3 further comprises Gd 2 Zr 2 O 7 ; and
the layer comprising Gd 2 Zr 2 O 7 further comprises Y 2 O 3 .

9. The microstructure of claim 5 , wherein the layers comprising Y 2 O 3 and Gd 2 Zr 2 O 7 comprise a plurality of layers of Y 2 O 3 +Gd 2 Zr 2 O 7 between the plurality of layers of YAG.

Assignees

• Univ Connecticut

Inventors

• Jordan Eric H
• Gell Maurice
• Kumar Rishi
• Jiang Chen

Classifications

• C01F17/34

  Aluminates, e.g. YAlO3 or Y3-xGdxAl5O12 · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C04B2237/343

  Alumina or aluminates · CPC title

• C04B2237/34

  Oxidic · CPC title

• C04B2235/3225

  Yttrium oxide or oxide-forming salts thereof · CPC title