Direct bonded environmental barrier coatings for sic/sic composites and methods for preparing the same
AssigneeHoneywell International Inc.
InventorsMehrad Mehr, Bahram Jadidian
Life of this patent
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Abstract
A method of preparing a ceramic matrix composite (CMC) article is disclosed. The method includes depositing a first layer of a coating composition directly onto a surface of a silicon carbide fiber-reinforced silicon carbide matrix (SiC/SiC) composite substrate, with the coating composition comprising a rare earth silicate and a sintering aid. The method also includes heating the first layer to sinter the coating composition to form an environmental barrier coating (EBC) adjacent the SiC/SiC composite and a transition layer integrally bonded to and between the substrate and the EBC. CMC articles prepared according to the method, including coated turbomachine components, are also disclosed.
Claims17
A method of preparing a ceramic matrix composite (CMC) article, the method comprising:
- depositing a first layer of a coating composition directly onto a surface of a silicon carbide fiber-reinforced silicon carbide matrix (SiC/SiC) composite substrate, the coating composition comprising a rare earth silicate and a sintering aid;
- and
- heating the first layer to sinter the coating composition to form an environmental barrier coating (EBC) adjacent the SiC/SiC composite substrate and a transition layer integrally bonded to and between the SiC/SiC composite substrate and the EBC, thereby preparing the CMC article, wherein the transition layer comprises a reaction product of the rare earth silicate of the coating composition and the SiC/SiC composite substrate, wherein the transition layer has a thickness of from 3 to 10 mils, and the EBC has a thickness of from 1.5 to 10 mils.
Dependencies are inferred from the claim text.