Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2004-04-27
2008-03-11
Zimmerman, John J. (Department: 1775)
Stock material or miscellaneous articles
Composite
Of inorganic material
C416S24100B, C416S24100B, C428S446000
Reexamination Certificate
active
07341797
ABSTRACT:
A protective coating for use on a silicon-containing substrate, and deposition methods therefor. The coating has a barium-strontium-aluminosilicate (BSAS) composition that is less susceptible to degradation by volatilization and in corrosive environments as a result of having at least an outer surface region that consists essentially of one or more stoichiometric crystalline phases of BSAS and is substantially free of a nonstoichiometric second crystalline phase of BSAS that contains a substoichiometric amount of silica. The coating can be produced by carrying out deposition and heat treatment steps that result in the entire coating or just the outer surface region of the coating consisting essentially of the stoichiometric celsian phase.
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patent: 6352790 (2002-03-01), Eaton et al.
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Govern Christine
Hazel Brian Thomas
Spitsberg Irene
Austin Aaron
General Electric Company
Hartman Domenica N. S.
Hartman Gary M.
ScottAndes William
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