Abstract
ABSTRACT In this study, ZrO2–Al2O3 composite ceramic coating toughened by ZrO2 nanorods through cathode plasma electrolytic deposition (CPED) was prepared on Al–Si alloy substrate. The microstructure, heat insulation performance, and fracture toughness of the coatings were investigated with SEM, XRD, heat insulation tests, and tensile tests. The ZrO2 nanorods prepared by the hydrothermal method consist of monoclinic m-ZrO2 and cubic c-ZrO2. The ZrO2 nanorods are staggered in the ceramic coating and partially filled with plasma discharge micropores. The ZrO2–Al2O3 ceramic coating, after adding zirconia nanorods, forms a high-temperature stable mixture of Zr3Y4O12, Al2O3, and ZrO2 phases. The duration of hydrothermal during the preparation of ZrO2 nanorods correlates with the heat insulation temperature of the toughened ceramic coating. The fracture toughness of ceramic coating toughened by ZrO2 nanorods varies with hydrothermal duration, which can be effectively improved.
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