Layer system comprising gadolinium solid solution pyrochlore phase

Patent metadata

Field	Value
Publication number	US-9611551-B2
Application number	US-8539906-A
Country	US
Kind code	B2
Filing date	Oct 17, 2006
Priority date	Nov 24, 2005
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

Heat insulating layered systems should have a long service life in addition to excellent heat-insulating properties. Disclosed in an inventive layered system consisting of an external ceramic layer that has a mixed crystal consisting of gadolinium zirconate and gadolinium hafnate.

First claim

The invention claimed is:

1. A layer system, comprising:
a substrate;
an outer ceramic layer arranged on the substrate where the ceramic layer comprises a pyrochlore structure Gd v (Zr x Hf y )O z , where x+y=2;
an inner ceramic layer that comprises a 6 wt %-8 wt % yttrium stabilized oxide layer arranged between the outer ceramic layer and the substrate; and
wherein the inner ceramic layer has a layer thickness of between 10% and 50% of the total layer thickness of the inner ceramic layer and the outer ceramic layer, and the total layer thickness of the inner ceramic layer and the outer ceramic layer is about 300 μm to about 800 μm.

2. The layer system as claimed in claim 1 , wherein the outer ceramic layer comprises Gd 2 (Zr x Hf y )O z .

3. The layer system as claimed in claim 2 , wherein the outer ceramic layer comprises Gd V (Zr x Hf y )O 7 .

4. The layer system as claimed in claim 3 , wherein the outer ceramic layer consists of Gd V (Zr x Hf y )O z .

5. The layer system as claimed in claim 4 , wherein the outer ceramic layer consists of Gd 2 (Zr x Hf y )O 7 where x+y=2.

6. The layer system as claimed in claim 5 , wherein the mixing ratio of hafnium and zirconium is selected from the group consisting of: 10:90, 20:80, 30:70, 40:60, 50:50, 60:40, 70:30, 80:20, and 90:10.

7. The layer system as claimed in claim 5 , wherein y>x.

8. The layer system as claimed in claim 5 , wherein y<x.

9. The layer system as claimed in claim 1 , wherein the combined layer thickness of the inner ceramic layer and the outer ceramic layer is 300 μm.

10. The layer system as claimed in claim 1 , wherein the combined layer thickness of the inner layer and the outer layer is 400 μm.

11. The layer system as claimed in claim 1 , further comprising a metallic NiCoCrAlX alloy bonding layer arranged on the substrate and beneath the inner ceramic layer or beneath the outer ceramic layer.

12. The layer system as claimed in claim 11 , wherein the metallic bonding layer has the composition (in wt %):
11%-13% cobalt,
20%-22% chromium,
10.5%-11.5% aluminum,
0.3%-0.5% yttrium,
1.5%-2.5% rhenium, and
remainder nickel.

13. The layer system as claimed in claim 11 , wherein the metallic bonding layer has the composition (in wt %):
24%-26% cobalt,
16%-18% chromium,
9.5%-10.5% aluminum,
0.3%-0.5% yttrium,
1%-2.0% rhenium, and
remainder nickel.

14. The layer system as claimed in claim 11 , wherein the metallic bonding layer has the composition (in wt %) consisting of:
29%-31% nickel,
27%-29% chromium,
7%-9% aluminum,
0.5%-0.7% yttrium,
0.6%-0.8% silicon, and
remainder cobalt.

15. The layer system as claimed in claim 11 , wherein the metallic bonding layer (7) has the composition (in wt %) consisting of:
27%-29% nickel,
23%-25% chromium,
9%-11% aluminum,
0.3%-0.7% yttrium, and
remainder cobalt.

Assignees

• Kaiser Axel
• Schumann Eckart
• Subramanian Ramesh
• Siemens Ag

Inventors

• Kaiser Axel
• Schumann Eckart
• Subramanian Ramesh

Classifications

• C23C28/3455

  with a refractory ceramic layer, e.g. refractory metal oxide, ZrO2, rare earth oxides or a thermal barrier system comprising at least one refractory oxide layer · CPC title

• C23C30/00 Primary

  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

• C23C14/08

  Oxides (C23C14/10 takes precedence) · CPC title

• C23C28/321

  with at least one metal alloy layer · CPC title

• C23C28/3215

  at least one MCrAlX layer · CPC title