Compositions: ceramic – Ceramic compositions – Refractory
Reexamination Certificate
2005-08-16
2005-08-16
Marcantoni, Paul (Department: 1755)
Compositions: ceramic
Ceramic compositions
Refractory
C501S134000, C501S152000, C252S062000
Reexamination Certificate
active
06930066
ABSTRACT:
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.
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Kazuo Shinozaki, Hongrong Sun, Keizo Uematsu, Nobuyasu Mizutani, and Masanori Kato. Sintering Sm2O3—ZrO2Solid Solution.The Chemical Society of Japan, 1981,(9), pp. 1454-1461.
Marcantoni Paul
Siemens Westinghouse Power Corporation
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