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Highly defective oxides as sinter resistant thermal barrier coating

United States Patent

August 16, 2005
View the Complete Patent at the US Patent & Trademark Office
A thermal barrier coating material formed of a highly defective cubic matrix structure having a concentration of a stabilizer sufficiently high that the oxygen vacancies created by the stabilizer interact within the matrix to form multi-vacancies, thereby improving the sintering resistance of the material. The concentration of stabilizer within the cubic matrix structure is greater than that concentration of stabilizer necessary to give the matrix a peak ionic conductivity value. The concentration of stabilizer may be at least 30 wt. %. Embodiments include a cubic matrix of zirconia stabilized by at least 30-50 wt. % yttria, and a cubic matrix of hafnia stabilized by at least 30-50 wt. % gadolinia.
Subramanian; Ramesh (Oviedo, FL)
Siemens Westinghouse Power Corporation (Orlando, FL)
10/ 010,676
December 6, 2001
This invention was made with United States Government support under contract number DE-FC21-95MC32267 awarded by the Department of Energy. The Government has certain rights in this invention.