CMC Core Inserts for Complex Internal Cooling Channels

The patent applies preliminary action by embedding core inserts into the CMC preform before densification. These core inserts define the cooling channel geometry in advance, allowing complex 3D structures to be formed during the manufacturing process itself rather than requiring subsequent machining operations. This resolves the contradiction by enabling design flexibility through integrated mold insertion while maintaining cost-effectiveness through process consolidation.

The core inserts serve as an intermediary tool that temporarily occupies the space where cooling channels will eventually exist. Made of fugitive materials, these inserts enable the formation of complex internal geometries during manufacturing and are subsequently removed, leaving behind precisely defined cooling channels. This intermediary approach resolves the contradiction by enabling complex designs without requiring expensive post-processing machining.

The patent merges the cooling channel formation process with the CMC manufacturing process by embedding core inserts into the preform before densification. This allows complex internal structures to be created as an integrated part of the manufacturing process rather than through separate, complex post-processing steps. The merging resolves the contradiction by enabling high cooling efficiency through complex geometries while reducing manufacturing complexity through process integration.

The patent utilizes parameter changes by selecting core insert materials with specific properties (fugitive materials that can be selectively removed) and controlling the densification process parameters to achieve selective material removal. This enables the creation of complex internal structures with optimized cooling efficiency while keeping the manufacturing process relatively simple through material property exploitation rather than complex machining operations.

The patent applies preliminary action by forming cooling channels during the CMC manufacturing process itself, before the component is fully densified. The core inserts are embedded in the preform and define the channel geometry during densification. This preliminary formation of cooling channels eliminates the need for subsequent drilling or machining operations, thereby maintaining structural integrity through the densification process while significantly improving manufacturing efficiency by consolidating operations.

The densification process itself serves the dual function of both densifying the CMC material and forming the cooling channels through the presence of embedded core inserts. The process is self-sufficient, requiring no additional post-processing steps to create the cooling structures. This self-service approach resolves the contradiction by maintaining structural integrity through integrated manufacturing while improving productivity through process consolidation.