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US 7,108,925 B2Granted
High temperature insulation utilizing zirconia-hafnia
AssigneeSiemens Power Generation, Inc.
InventorChristian X. Campbell
Life of this patent
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Abstract
A ceramic insulating composition including monoclinic zirconia-hafnia. The zirconia-hafnia may be used as a filler powder (14) in a ceramic composition (10), or it may be used as a protective overlayer (50). The zirconia-hafnia (24) may be combined with alumina (22) to achieve a desired elastic modulus. The portion of hafnia contained in the zirconia-hafnia is selected to provide a predetermined phase transition temperature to minimize undesired phase changes during high temperature use of the material.
Claims10
A ceramic composition comprising:
- a plurality of oxide shapes;
- a filler powder comprising particles of zirconia-hafnia;
- and
- a binder material partially filling gaps between the oxide shapes and the filler powder;
- wherein the filler powder particles comprise an average size of at least 30 microns and exhibit micro-cracks contained within the particles and not propagated into the binder material.
2 more elements
Dependencies are inferred from the claim text.