Method for bonding cmc facesheets to ceramic cores

A method for forming a ceramic matrix composite (“CMC”) component, the method comprising:

• applying a reaction layer on a ceramic core, the reaction layer comprising silicon in the form of elemental silicon, a silicon-containing compound, or an intermetallic silicide;
• applying a CMC fiber preform on the reaction layer, the CMC fiber preform comprising a plurality of CMC fiber tows;
• forming an interface coating on at least a portion of the CMC fiber tows either prior to applying the CMC fiber preform on the reaction layer, or after applying the CMC fiber preform on the reaction layer;
• forming a ceramic matrix on the CMC fiber preform after the CMC fiber preform is applied to the reaction layer, wherein the CMC fiber preform and the ceramic matrix form a CMC facesheet;
• and
• thermally processing the CMC facesheet and the ceramic core to react the interface coating with the silicon in the reaction layer to form a silicon carbide (SiC) bonding layer between the CMC facesheet and the ceramic core.

A method for forming a ceramic matrix composite (“CMC”) component, the method comprising:

• applying a CMC fiber preform to a ceramic core, the CMC fiber preform comprising a plurality of CMC fiber tows, and the ceramic core comprising an excess of silicon;
• forming an interface coating on at least a portion of the CMC fiber tows either prior to applying the CMC fiber preform to the ceramic core, or after applying the CMC fiber preform to the ceramic core;
• forming a ceramic matrix on the CMC fiber preform after the CMC fiber preform is applied to the ceramic core, wherein the CMC fiber preform and the ceramic matrix form a CMC facesheet;
• and
• thermally processing the CMC facesheet and the ceramic core to react the interface coating with the excess silicon to form a silicon carbide (SiC) bonding layer at the interface.