THERMOMECHANICAL PERFORMANCE OF YSZ/SICN CERAMIC MATRIX COMPOSITES IN HYDROGEN GAS TURBINE ENGINES

Ceramic matrix composites (CMCs) are known for their endurance in high temperatures. This study investigated the thermo-mechanical performance of the silicon carbide nitride (SiCN) reinforced with yttria-stabilized zirconia (YSZ) fiber for hydrogen-fueled gas turbine engines. To explore its thermal stability at high temperatures, a hydrogen torch test was used to expose the CMC to a high heat flux under hydrogen combustion conditions. In addition, the inner wall of a hydrogen combustion chamber was lined with the CMC to study its application as a protective layer. The composite surface could withstand a temperature of 1,400°C for 10 minutes during the torch test. High temperature hydrogen flame also caused the formation of SiO2 as confirmed from the SEM and XRD measurements. The CMC liner was subjected to hydrogen flame of about 680°C at 1 atm pressure and the layer was successful in maintaining 185°C at the combustion chamber wall. Multiple polymer infiltration and pyrolysis (PIP) cycles were repeated to reduce the porosity of the composite and enhance its properties. Analytical and numerical modeling were employed to understand heat conduction process in the CMC. The results generated from numerical model agreed with the experimental data. The results suggest a feasible prospect for the CMC to be used in high temperature application maintaining both its thermal and mechanical stability.