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US 12,703,665 B2Granted
Ceramic material, powder and layer system
AssigneeSiemens Energy Global GmbH & Co. KG
InventorArturo Flores Renteria
Life of this patent
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Abstract
An improved ceramic material for heat insulation is achieved by the following selection of specific stabilizers and the adapted proportions: Base of zirconium dioxide (ZrO2) with: 1.0 wt. % to 9.0 wt. % of base stabilizers: yttrium oxide (Y2O3), hafnium oxide (HfO2), wherein at least yttrium oxide (Y2O3) is used, and at least one of the additional stabilizers: erbium oxide (Er2O3) and/or ytterbium oxide (Yb2O3) with a proportion of 0.2 wt. % to 20 wt. %.
Claims20
A ceramic material based on zirconium oxide (ZrO2), comprising (in wt %):
- up to 8.0 wt % of base stabilizers, the base stabilizers comprising:
- at least 2.5 wt % yttrium oxide (Y2O3), and optionally hafnium oxide (HfO2),
- additional stabilizers comprising:
- erbium oxide (Er2O3) and/or ytterbium oxide (Yb2O3)
- with a fraction of 0.2 wt % to 20.0 wt %,
- further comprising:
- aluminum oxide (Al2O3) 0.1%-3.0 wt %
- and further comprising allowed impurity levels:
- calcium oxide (CaO)
- up to 0.2 wt%,
- iron oxide (Fe2O3)
- up to 0.2 wt%,
- magnesium oxide (MgO)
- up to 0.2 wt%,
- silicon oxide (SiO2)
- up to 0.3 wt%,
- titanium oxide (TiO2)
- up to 0.2 wt%.
15 more elements
Dependencies are inferred from the claim text.