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AssigneeGeneral Electric Company
InventorsHongyu Wang, Yuk-Chiu Lau, Irene Spitsberg, Arnold T. Henry
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A process of depositing a coating system suitable for use as an environmental barrier coating on various substrate materials, particularly those containing silicon and intended for high temperature applications such as the hostile thermal environment of a gas turbine engine. The process comprises depositing a first coating layer containing mullite, and preferably a second coating layer of an alkaline earth aluminosilicate, such as barium-strontium-aluminosilicate (BSAS), by thermal spraying while maintaining the substrate at a temperature of 800° C. or less, preferably 500° C. or less, by which a substantially crack-free coating system is produced with desirable mechanical integrity.
A method of depositing a coating system on a substrate, the coating system comprising a first coating layer and a second coating layer on the first coating layer so as to be adhered to the substrate with the first coating layer, the first coating layer having a composition containing mullite, the second coating layer consisting essentially of an alkaline earth aluminosilicate, the method comprising the steps of depositing the first coating layer and then depositing the second coating layer by thermal spraying while maintaining the substrate at a temperature of less than 800° C. during the deposition of at least one of the first and second coating layers, wherein the first coating layer contains crystalline mullite immediately following the deposition thereof.
A method of forming an environmental barrier coating system on a gas turbine engine component having a substrate region formed of a silicon-containing material, the method comprising the steps of:
Dependencies are inferred from the claim text.