Patent ID: 11919820
Assignee: RTX CORPORATION
Field: nan (nan)
Classification: CPC nan | IPC C  D

Claim 12:
13. A method for forming a multi-layer interface coating onto a ceramic fiber comprising:
depositing a first silicon carbide coating layer onto the fiber,
oxidizing a portion of the first silicon carbide coating layer to form an amorphous silicon dioxide coating layer, wherein the first silicon carbide coating layer is heat treated in the presence of oxygen to oxidize a portion of the first silicon carbide coating layer to form the amorphous silicon dioxide coating layer,
depositing an additional coating layer on the silicon dioxide coating layer, wherein the additional coating layer on the silicon dioxide coating layer is opposedly disposed on a surface of the silicon dioxide from the surface that contacts the first silicon carbide coating; and
crystallizing the amorphous silicon dioxide layer to beta cristobalite, wherein the crystallizing the amorphous silicon dioxide layer to beta cristobalite includes a heat treatment at 1200° C. to 1650°;
wherein the beta cristobalite forms micro cracks in the silicon dioxide coating layer after transforming to a cristobalite form; and
wherein the additional coating layer includes silicon carbide.