METHODS FOR PRODUCING INTERNAL CAVITY IN CERAMIC MATRIX COMPOSITE MATERIAL AND MANDREL THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a process for producing an internal cavity in a CMC article and mandrels used therewith.SOLUTION: A process includes incorporating a mandrel made of a material that is substantially absorbed during a thermal treatment of a preform to form a CMC article. The mandrel material preferably reacts with one or more constituents of the CMC preform during the thermal treatment. The material is preferably silicon or a silicon alloy.