Preparation and oxidation of an Al₂O₃-modified aluminide coating

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• 作者：Y.B. Zhou ; ^{zhouyuebo760309@163.com} ; ^{ybzhou@imr.ac.cn} ; H.J. Zhang
• 关键词：Electrodeposited ; Aluminide coatings ; SEM ; XRD ; Oxidation
• 刊名：Vacuum
• 出版年：2012
• 期刊代码：83_0042207x
• 类别：ph
• 出版时间：14 March, 2012
• 卷：86
• 期：9
• 页码：1353-1357
• 文件大小：1168 K

摘要

An Al₂O₃-modified aluminide coating was produced by aluminizing an as-electrodeposited Ni-Al₂O₃ nanocomposite film using pack cementation method at 1100聽聽C for 4聽h. For comparison, aluminizing was also performed in the same condition on an as-deposited Ni film without Al₂O₃ nanoparticles. SEM/EDAX and TEM results indicated that the co-deposited Al₂O₃ nanoparticles were homogeneously dispersed in the finer-grain nanocrystalline Ni grains. The isothermal and cyclic oxidation in air at 900聽掳C indicated that the Al₂O₃-modified aluminide coatings were profoundly oxidation resistant as compared to the Al₂O₃-free aluminide coatings due to the faster formation of a continuous adherent 伪-Al₂O₃ scale. The effect of Al₂O₃ on the microstructure and the oxidation of the aluminide coating are discussed in the detail.