Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-09-02
2009-10-06
Speer, Timothy M (Department: 1794)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S702000, C428S469000, C428S472000, C416S24100B
Reexamination Certificate
active
07597971
ABSTRACT:
The present invention relates to a thermal barrier coating material having the chemical composition of (1−n)CeO2-nZrO2-0.5R2O3, where n is in the range of 0.9≧n≧0 and R is selected from a group consisting of Nd, Sm, Eu, Gd, Tb and combinations of at least two among them. It possesses a thermal expansion coefficient higher than 12×10−6K−1from ambient temperature up to 1200° C. and superior to those of the presently widely-used thermal barrier coating materials. Even if it is subjected to long time calcinations at 1400° C. or is quenched to room temperature, it can still maintain the stable crystal structure. In addition, its thermal expansion trend matches quite well with that of the bond coating alloy. This is beneficial to the elimination of thermal stress generated between the substrate and the ceramic top coating during the thermal cycle and can significantly improve the thermal shock resistance of the coating. The present invention further relates to a method for producing a thermal barrier coating material and a method for preparing a thermal barrier coating.
REFERENCES:
patent: 4839146 (1989-06-01), Cho et al.
patent: 5789330 (1998-08-01), Kondo et al.
patent: 6231991 (2001-05-01), Maloney
Cao Xueqiang
Dai Hui
Li Jiayan
Meng Jian
Changchun Institute of Applied Chemistry Chinese Academy of Scie
Knobbe Martens Olson & Bear LLP
Speer Timothy M
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