3D-printed porous ceramic liners for high-temperature noise control applications

Ceramics and ceramic matrix composites offer the potential for the development of high-temperature acoustic liners that could be integrated into aircraft engines in regions where traditional liners fail. Building on previous work using clay extrusion to produce porous ceramic structures, we now explore a vat photopolymerization method capable of creating more precise geometries and finer microstructural details. In this approach, a commercial ceramic printer employing digital light photopolymerization is used to fabricate porous architectures. The resulting “green” parts are fired and sintered in a controlled atmosphere to achieve the final ceramic composition. Acoustic testing is then conducted under normal incidence using a two-microphone impedance tube, allowing us to analyze how the porous architecture influences sound absorption behavior. The findings highlight the feasibility of vat photopolymerization for producing high-temperature ceramic acoustic liners with enhanced design freedom, thereby broadening the potential for noise reduction solutions in aircraft engine environments.