Multilayer environmental barrier coating
AssigneeRtx Corporation
InventorsZachary KENNEDY, James T. BEALS, Richard Wesley JACKSON, III, Xia TANG
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Abstract
Environmental barrier coatings (EBCs) comprising a bond coat and a top coat are disclosed. An EBC bond coat, an EBC top coat, or both coats may comprise (i) one or more transition metal silicate having an initial particle size that is coarse (“coarse TM silicate”) and (ii) one or more transition metal silicate having an initial particle size that is fine (“fine TM silicate”). Fine TM silicate may partially or completely plate one or more coarse TM silicate particles. Methods of producing such EBCs are disclosed.
Claims21
A multilayer environmental barrier coating, comprising:
- a bond coat and a top coat;
- wherein
- (i) at least one portion of the bond coat, (ii) at least one portion of the top coat, or (iii) at least one portion of each of the bond coat and the top coat comprises one or more fine transition metal silicate and one or more coarse transition metal silicate;
- and
- in at least one portion wherein both fine transition metal silicate and coarse transition metal silicate are present, the fine transition metal silicate forms a partial or complete plate on at least one particle of the coarse transition metal silicate.
A method for making a multilayer environmental barrier coating system, the method comprising:
- providing a substrate;
- providing a bond coat and a top coat, wherein (i) at least one portion of the bond coat, (ii) at least one portion of the top coat, or (iii) at least one portion of each of the bond coat and the top coat comprises one or more fine transition metal silicate and one or more coarse transition metal silicate;
- depositing the bond coat on the substrate;
- depositing the top coat on the bond coat;
- and
- sintering the substrate, the bond coat, and the top coat;
- wherein the sintering causes one or more particles of the fine transition metal silicate to partially or completely plate at least one particle of the coarse transition metal silicate.
A multilayer environmental barrier coating system comprising:
- a ceramic matrix composite component coated by a bond coat and the bond coat coated by a top coat;
- wherein (i) at least one portion of the bond coat, (ii) at least one portion of the top coat, or (iii) at least one portion of each of the bond coat and the top coat comprises one or more fine transition metal silicate and one or more coarse transition metal silicate;
- and in at least one portion wherein both the fine transition metal silicate and the coarse transition metal silicate are present, the fine transition metal silicate forms a partial or complete plate on at least one particle of the coarse transition metal silicate;
- wherein
- the multilayer environmental barrier coating system is produced by a process comprising:
- providing a ceramic matrix composite component;
- depositing a bond coat on the component;
- depositing a top coat on the bond coat;
- and
- sintering the component, the bond coat, and the top coat, at a temperature and for a time, wherein the temperature and the time are together sufficient to cause the fine transition metal silicate to partially or completely plate at least one particle of the coarse transition metal silicate.
Dependencies are inferred from the claim text.