Pin-Mounted CMC Heat Shields With Targeted Impingement Cooling

The patent applies local quality by implementing impingement cooling at specific preselected areas on the attachment flange rather than uniform cooling across the entire component. Cooling air is directed precisely at the regions between the shroud wall and pins, creating localized cooling zones that address thermal gradients where they most affect pin reliability while preserving the high-temperature resistance of the CMC material in other areas.

The patent uses cooling air as an intermediary substance to transfer heat away from critical areas. The cooling air flows through passages in the metallic support structure and impinges on preselected areas of the attachment flange, acting as a thermal mediator that absorbs heat before it reaches the pins, thereby protecting them from thermal damage while allowing the shroud to operate at high temperatures.

The patent applies segmentation by dividing the cooling function into discrete passages within the metallic support structure. Rather than a single complex cooling system, multiple cooling passages are distributed throughout the structure, each directing cooling air to specific preselected areas on the attachment flange. This segmented approach manages thermal gradients effectively while keeping the overall design modular and manageable.

The patent utilizes composite construction by combining ceramic matrix composite material for the shroud wall with a metallic support structure that incorporates cooling passages. This composite material approach allows the CMC to withstand high temperatures while the metallic structure provides integrated cooling capability, distributing the functional requirements across different materials to manage complexity.