Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-06-13
2008-08-05
Speer, Timothy M (Department: 1794)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S469000, C428S699000, C428S702000, C416S24100B
Reexamination Certificate
active
07407718
ABSTRACT:
A coating system for Si-containing materials, particularly Si-based composites used to produce articles exposed to high temperatures. The coating system is a compositionally-graded thermal/environmental barrier coating (T/EBC) system that includes an intermediate layer containing yttria-stabilized hafnia (YSHf) and mullite, alumina and/or an aluminosilicate, which is used in combination with an inner layer between a Si-containing substrate and the intermediate layer and a thermal-insulating top coat overlying the intermediate layer. The intermediate layer provides environmental protection to the silicon-containing substrate, and has a coefficient of thermal expansion between that of the top coat and that of the inner layer so as to serve as a transition layer therebetween. The intermediate layer is particular well suited for use in combination with an inner layer of an alkaline earth metal aluminosilicate (such as BSAS) and a top coat formed of YSZ or YSHf.
REFERENCES:
patent: 6733908 (2004-05-01), Lee et al.
patent: 6759151 (2004-07-01), Lee
patent: 7115326 (2006-10-01), Spitsberg et al.
patent: 2005/0013994 (2005-01-01), Strangman
Govern Christine
Hazel Brian Thomas
Nagaraj Bangalore Aswatha
Spitsberg Irene
Andes William Scott
General Electric Company
Hartman Domenica N. S.
Hartman Gary M.
Speer Timothy M
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