Aluminate coating for a silicon containing substrate
AssigneeGeneral Electric Company
InventorsPeter Joel Meschter, David Joseph Mitchell, Krishan Lal Luthra, Jennifer Su Saak
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Abstract
A coating for silicon based materials such as those used in high temperature, aqueous environments. An aspect of the invention is directed to an article including a silicon based substrate, a bond coat comprising silicon, and a barrier coat. The barrier coat includes an aluminate such as an alkaline earth metal aluminate or a rare earth aluminate. The barrier coat may be an intermediate coat between the bond coat and a top coat, or it may be the top coat.
Claims23
An article comprising
- a substrate comprising at least one selected from the group consisting of silicon carbide and silicon nitride;
- a bond coat on the substrate, said bondcoat comprising silicon metal;
- and
- a barrier coat on the bond coat, wherein a majority of the barrier coat comprises an aluminate selected from consisting of a rare earth aluminate, calcium aluminate, magnesium aluminate, and combinations thereof.
An article comprising:
- a substrate comprising at least one selected from the group consisting of silicon carbide and silicon nitride;
- a bond coat on the substrate, said bondcoat comprising silicon metal;
- at least one intermediate coat on the bond coat;
- and
- a top coat on the at least one intermediate coat, wherein a majority of the to coat comprises an aluminate selected from the group consisting of a rare earth aluminate, calcium aluminate, magnesium aluminate, and combinations thereof.
A method for providing an article, the method comprising applying a bond coat comprising silicon metal on a substrate comprising at least one selected from the group consisting of silicon carbide and silicon nitride;
- and
- applying a barrier coat on the bond coat, wherein a majority of the barrier coat comprises an aluminate selected from the group consisting of a rare earth aluminate, calcium aluminate, magnesium aluminate, and combinations thereof.
Dependencies are inferred from the claim text.