Jacketed Core Casting for Complex Internal Passages

The patent applies composite materials by combining a ceramic core with a metallic jacket to create a hybrid core structure. The ceramic portion maintains its ability to define the internal passage geometry, while the metallic jacket provides mechanical strength and damage resistance. This composite approach resolves the contradiction by integrating the advantages of both materials: the ceramic's geometric precision and the metal's structural integrity, making the core both functional and manufacturable.

The patent changes the physical and chemical parameters of the core structure by applying a metallic coating or jacket to the ceramic core. This parameter change transforms the core from a purely ceramic, fragile structure to a composite structure with enhanced mechanical properties. The metallic layer modifies the core's strength, toughness, and handling characteristics while preserving the ceramic's ability to define the internal passage shape.

The patent applies preliminary action by forming the internal passage geometry during the initial casting process itself, rather than requiring subsequent drilling operations. The ceramic core is positioned in the mold cavity before the molten metal is introduced, so the passage is created as the metal solidifies around the core. This eliminates the need for time-consuming post-casting drilling operations, significantly improving productivity and reducing total manufacturing time.

The patent merges the core formation function with the casting process. Instead of separating the passage creation into distinct steps (casting followed by drilling), the method combines these operations by using the ceramic core as a permanent mold feature during casting. The internal passage is formed simultaneously with the component body, integrating multiple manufacturing functions into a single operation and eliminating redundant process steps.