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采用溶胶-凝胶热压滤法(TPFSP)可制备出具有空间网络结构的Al2O3/YSZ-Al2O3涂层。为进一步提高该涂层的抗高温氧化性能,本研究对该涂层进行化学致密化处理(PCD)。高温循环氧化结果表明,该涂层的抗高温氧化性能随PCD循环处理次数增加而增强,不过经12次PCD循环处理后,提高其抗高温氧化性能的作用效果发生衰减。高温循环氧化前后形貌分析表明,涂层表面的隆起随PCD循环处理次数增加而减少,复合涂层下的TGO层增厚及TGO层附近金属基体发生内氧化的程度也随PCD循环处理次数增加而减小,PCD对形貌的影响规律与其对氧化动力学曲线的影响规律相一致。
The Al2O3 / YSZ-Al2O3 coating with spatial network structure was prepared by sol-gel hot press filtration (TPFSP). In order to further improve the high-temperature oxidation resistance of the coating, this study conducted chemical densification (PCD) on the coating. High temperature cyclic oxidation results show that the high temperature oxidation resistance of the coating increases with the number of PCD cycles, but after 12 cycles of PCD cycle, the effect of increasing the high temperature oxidation resistance is attenuated. The morphological changes before and after high temperature cyclic oxidation show that the bump of the coating surface decreases with the increase of the number of PCD cycles. The thickening of the TGO layer and the internal oxidation of the metal matrix near the TGO layer also increase with the number of PCD cycles However, the influence of PCD on the morphology was consistent with its influence on the oxidation kinetics curve.