Abstract：NiCoCrAl coatings containing Y and Y oxide were made using vacuum plasma deposition and high-velocity oxygen fuel respectively, high temperature oxidation dynamics and cross-section microstructures of NiCoCrAl+Y and NiCoCrAl+Y(O) coatings in Ar-16.7%O2, Ar-3.3%H2O and Ar-0.2%H2-0.9%H2O at 1100℃ were investigated by differential thermal analysis (DTA) and optical and electron microscope. The influencing mechanism of Y oxide on the oxidation of coatings at different atmosphere was compared by computation using First-Principles. The results show that Al2O3 layer on NiCoCrAl+Y coatings has more holes for internal oxidation on account of the element Y diffusion and enrichment on the interface. In addition, steam can promote the internal oxidation. While a thinner and uniform alumina form on NiCoCrAl+Y(O) coatings because element Y is pinned by oxygen atoms during the preparation of coatings. Water vapor has less influence on protective alumina formation on the NiCoCrAl+Y(O) coating. Therefore, oxidation behavior of NiCoCrAl coatings vary in composition and structure in different oxidizing atmosphere. Besides, Y and Y-enrichment oxides have key influences on the microstructure and the growth rate.
王逸群, 宋鹏, 季强, 廖红星, 陆建生. H2O和Y(O)对NiCoCrAl热障涂层高温氧化的影响[J]. 材料工程, 2017, 45(4): 65-69.
WANG Yi-qun, SONG Peng, JI Qiang, LIAO Hong-xing, LU Jian-sheng. Effect of H2O and Y(O) on Oxidation Behavior of NiCoCrAl Coating Within Thermal Barrier Coating. Journal of Materials Engineering, 2017, 45(4): 65-69.
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