Exfoliated boron nitride for interface coating for ceramic matrix composites
AssigneeRtx Corporation
InventorsMary Colby, Kenneth Petroski, Andrew Joseph Lazur
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Abstract
A coated fiber structure for use in a ceramic matrix composite comprises a fiber and a fiber coating arrangement applied to and at least partially circumscribing the fiber. The fiber coating arrangement comprises a first boron nitride layer comprising exfoliated hexagonal boron nitride, a silicon carbide layer extending at least partially coaxially with and in direct contact with the first boron nitride layer, and a second boron nitride layer radially opposite the silicon carbide layer, with respect to the first boron nitride layer.
Claims20
A coated fiber structure for use in a ceramic matrix composite, the coated fiber structure comprising:
- a fiber;
- and
- a fiber coating arrangement applied to and at least partially circumscribing the fiber, the fiber coating arrangement comprising:
- a first boron nitride layer comprising exfoliated hexagonal boron nitride sheets;
- a silicon carbide layer extending at least partially coaxially with and in direct contact with the first boron nitride layer;
- and
- a second boron nitride layer radially opposite the silicon carbide layer, with respect to the first boron nitride layer.
A method of forming a ceramic matrix composite, the method comprising:
- applying a mixture of exfoliated hexagonal boron nitride sheets to a plurality of ceramic fibers, the exfoliated hexagonal boron nitride sheets at least partially forming a first boron nitride layer;
- depositing a silicon carbide layer on the first boron nitride layer, the silicon carbide layer extending at least partially coaxially with and in direct contact with the first boron nitride layer;
- depositing a second boron nitride layer radially opposite the silicon carbide layer with respect to the first boron nitride layer;
- wherein the first boron nitride layer, the silicon carbide layer, and the second boron nitride layer form a fiber coating arrangement at least partially circumscribing the plurality of ceramic fibers;
- and
- depositing a silicon carbide matrix on the plurality of ceramic fibers.
Dependencies are inferred from the claim text.