Effect of aluminum concentration on microstructure and evolution behavior of oxide layer on NiAlSiY coating at 500 degrees C
Effect of aluminum concentration on microstructure and evolution behavior of oxide layer on NiAlSiY coating at 500 degrees C
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500℃下铝浓度对NiAlSiY涂层微观结构和氧化层演化行为的影响
DOI：
10.1016/j.corsci.2019.108400
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发表时间：
2020
影响因子：
8.3
通讯作者：
He Guangyu
中科院分区：
文献类型：
--
作者：
Wei Yao;Zheng Shaoxian;Pu Jibin;Zhou Dapeng;Wang Liping;Guo Wuming;He Guangyu
制备了三种不同铝浓度的NiAlSiY涂层。研究了涂层在500℃下的等温氧化行为及机理。结果表明，表面形成了由NiO外层和Al2O3内层组成的多层氧化层。铝在镀层中的扩散以及从β-NiAl到γ'-Ni3Al的相变促进了Al2O3的形成。硅通过细化晶粒在铝的扩散中发挥着重要作用。当铝含量为21 wt.%时,氧化30h后NiAlSiY涂层上可形成致密的Al2O3层。
Three types of NiAlSiY coatings with different aluminum concentration were prepared. The isothermal oxidation behavior and mechanism of coatings at 500 °C were studied. The results indicate a multilayer oxide layer composed of NiO outer layer and Al2O3inner layer is formed on the surface. The diffusion of aluminum in the coating and the phase transition from β-NiAl to γ'-Ni3Al promote the formation of Al2O3. Silicon plays an important role in the diffusion of aluminum by refining grains. When the aluminum is 21 wt.%, a dense Al2O3layer can be formed on the NiAlSiY coating after oxidation for 30 h.