Abstract
PEO ceramic coatings including ZrO2-Al2O3-SiO2 in three phases were prepared on an Al- 12.5%Si alloy in electrolyte solutions containing ZrO2 nanoparticles. The microstructures and phases of the coatings were analyzed by SEM and XRD, and the heat insulation performance and the thermal shock resistance of the coatings were investigated. The compactness of the coating increased significantly and the hindrance of the Si element on plasma electrolytic oxidation process was effectively weakened. The growth rate of the coating was improved substantially with the addition of ZrO2 nanoparticles. The PEO ceramic coatings are primarily composed of SiO2 and high temperature steady phases such as α-Al2O3 and c-ZrO2. Both the content of c-ZrO2 and the heat-insulating property of the coating increased significantly. The ceramic coatings with special microstructure and composition formed in the solutions containing ZrO2 nanoparticles possess excellent heat insulation performance and thermal shock resistance
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