Simulation analysis of La2Ce2O7 thermal barrier coating in marine internal combustion engine

In the realm of thermal barrier coating (TBC) technology's applications, YSZ is ubiquitously employed as a ceramic coating material owing to its superior thermal insulation capabilities and its adept thermal expansion compatibility in high-temperature settings. However, YSZ is susceptible to cracking and phase transformation from the tetragonal to the monoclinic phase, a phenomenon that is exacerbated by thermal stresses experienced during high-temperature operations and subsequent cooling cycles. To address the thermal cycle durability and phase stability issues revealed in the traditional single ceramic layer material YSZ, a double-layer ceramic coating structure on pistons has been examined by three-dimensional simulation approach. When the thickness of the thermal barrier coating (comprising 0.1 mm + 0.3 mm) is held constant, the conventional YSZ material is chosen as the ceramic substrate. Through numerical calculations, the influence rules of various ceramic top layer materials are analyzed. It is discovered that the thermal insulation effect of the LCO-YSZ double-layer ceramic layer coating piston is superior. On this basis, the influence of the thickness of the ceramic top layer on the temperature field is investigated. The results indicate that the temperature of the piston substrate decreases as the thickness of the top layer increases, and the temperature of the piston substrate drops approximately 2 °C with an increase of 0.05 mm in thickness.