Thermal barrier material exhibiting manufacturability, high toughness and low thermal conductivity
OwnerMolly Maureen O’Connor, Andreis Peter Castronova +3inventors
InventorsMolly Maureen O’Connor, Andreis Peter Castronova, Richard Eugene Cook, Andrew James Heidloff, William John Jarosinski
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Abstract
A modified ternary Zr—Ta—Y oxide system is provided having a larger non-transformable, tetragonal phase that enables thermal barrier materials with improved properties of low thermal conductivity, higher sinter resistance, higher phase stability, and higher toughness to be created.
Claims17
A modified improved thermal barrier composition, comprising
- a primary oxide comprising zirconium oxide and cerium oxide;
- a secondary oxide comprising one or more secondary oxide cations of the elements tantalum, niobium or a combination thereof;
- and
- a tertiary oxide selected from the group consisting of oxides of the rare earth elements, yttrium, scandium and any combination thereof.
A modified thermal barrier material, said material characterized as a substantially single phase of the non-transformable, tetragonal phase exhibiting phase stability for at least 100 hrs at elevated temperatures of at least 1500 deg C, a low thermal conductivity of less than about 2 W/m/K, a toughness equal to or greater than about 20 J/m2 and a sintering resistance at a temperature of at least 1500 deg C, that incurs less microstructural degradation than a commercially available 7 weight percent yttria stabilized zirconia material.
A modified improved thermal barrier composition, comprising
- a primary oxide comprising zirconium oxide, hafnium oxide, or a combination therein and cerium oxide;
- a secondary oxide comprising one or more secondary oxide cations of the elements tantalum, niobium or a combination thereof;
- and
- a tertiary oxide selected from the group consisting of oxides of the rare earth elements, yttrium, scandium and any combination thereof.
Dependencies are inferred from the claim text.