Ceramic material, powder, and layer system comprising the ceramic material

Patent metadata

Field	Value
Publication number	US-12187652-B2
Application number	US-202017770821-A
Country	US
Kind code	B2
Filing date	Mar 18, 2020
Priority date	Nov 12, 2019
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

An improved ceramic material for heat insulation with selection of specific stabilizers and adapted proportions, includes zirconium oxide with 0.2 wt. % to 8.0 wt. % of the base stabilizers: yttrium oxide (Y 2 O 3 ), hafnium oxide (HfO 2 ), cerium oxide (CeO 2 ), calcium oxide (CaO), and/or magnesium oxide (MgO), wherein at least yttrium oxide (Y 2 O 3 ) is used, and optionally at least one of the additional stabilizers: 0.2 wt. % to 20 wt. % of erbium oxide (Er 2 O 3 ) and/or ytterbium oxide (Yb 2 O 3 ).

First claim

The invention claimed is:

1. A ceramic material
based on zirconium oxide (ZrO 2 ) and comprising:
3.2 wt % to 8.0 wt % of base stabilizers, the base stabilizers comprising: 3.0 wt % to 5.0 wt % yttrium oxide (Y 2 O 3 ), 0.2 wt % to 2.0 wt % hafnium oxide (HfO 2 ), and a remainder, the remainder comprising: cerium oxide (CeO 2 ), calcium oxide (CaO) and/or magnesium oxide (MgO), and
at least one additional stabilizer, the at least one additional stabilizer comprising 6.0 wt % to 8.0 wt % of ytterbium oxide (Yb 2 O 3 ).

2. The ceramic material as claimed in claim 1 , comprising:
3.5 wt % to 4.0 wt % of yttrium oxide (Y 2 O 3 ).

3. The ceramic material as claimed in claim 1 , comprising:
6.5 wt % to 7.5 wt % of ytterbium oxide (Yb 2 O 3 ).

4. A ceramic powder comprising,
a composition of the ceramic material as claimed in claim 1 .

5. A layer system at least comprising:
a metallic substrate,
optionally a metallic adhesion promoter layer, and
at least one ceramic layer based on the ceramic material as claimed in claim 1 .

6. The layer system as claimed in claim 5 , comprising:
the metallic adhesion promoter layer between the at least one ceramic layer and directly on the metallic substrate,
wherein the metallic adhesion promoter layer comprises an alloy of the type NiCoCrAlY—X, where X is optional and can be Ta, Re and/or Si.

7. The layer system as claimed in claim 5 ,
wherein a ceramic sublayer is present below the at least one ceramic layer,
which more particularly is at least 20% thinner than the at least one ceramic layer and comprises yttrium-stabilized zirconium oxide (YSZ).

8. The layer system as claimed in claim 7 , which comprises a segmentation comprising,
vertical cracks in the ceramic sublayer.

9. The layer system as claimed in claim 8 ,
in which the segmentation is present by means of vertical cracks only in an outermost ceramic layer of the at least one ceramic layer.

10. The layer system as claimed in claim 8 ,
in which the segmentation runs by means of vertical cracks through the ceramic sublayer and one ceramic layer of the at least one ceramic layer.

11. The layer system as claimed in claim 10 ,
in which a number of vertical cracks extend from a surface of the at least one ceramic layer up to the metallic adhesion promoter layer.

12. The layer system as claimed in claim 8 ,
in which numerous vertical cracks extend up to the metallic adhesion promoter layer.

13. A ceramic material
based on zirconium oxide (ZrO 2 ) and comprising:
2.0 wt % to 5.0 wt % yttrium oxide (Y 2 O 3 );
0.2 wt % to 2.0 wt % hafnium oxide (HfO 2 ); and
6.0 wt % to 8.0 wt % of ytterbium oxide (Yb 2 O 3 ).

Assignees

• Siemens Energy Global Gmbh & Co Kg
• Siemens Energy Global Gmbh &Co Kg

Inventors

• Flores Renteria Arturo
• Zois Dimitrios

Classifications

• C04B2237/64

  Forming laminates or joined articles comprising grooves or cuts · CPC title

• C04B2237/40

  Metallic · CPC title

• C04B2237/348

  Zirconia, hafnia, zirconates or hafnates · CPC title

• C04B2237/123

  based on iron group metals, e.g. steel · CPC title

• C04B2237/122

  based on refractory metals · CPC title