Method of producing an internal cavity in a ceramic matrix composite and mandrel therefor

摘要

A process for producing an internal cavity in a CMC article (100) and mandrels (40) used therewith. The process entails incorporating a mandrel (40) made of a material that is substantially absorbed during thermal treatment of a preform (10) to form the CMC article (100). The mandrel material is preferably reactive with one or more constituents of the CMC preform (10) during the thermal treatment. The material is preferably silicon or a silicon alloy.