Cyclic Oxidation of Sputter-DepositedNanocrystalline Fe-Cr-Ni-Al Alloy Coatings

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• 作者：Liu ; Zhenyu ; Gao ; Wei ; Li ; Meishuan
• 关键词：NANOCRYSTALLINE COATING ; S STAINLESS STEELS ; CYCLIC OXIDATION ; Al2O3 SCALE
• 刊名：Oxidation of Metals
• 出版年：1999
• 出版时间：1999
• 年：1999
• 卷：51
• 期：5/6
• 页码：403-419
• 全文大小：522 KB

文摘

Nanocrystalline coatings of AISI 310S stainlesssteel with a small amount of Al were produced usingunbalanced magnetron-sputter deposition with a compositetarget. Cyclic oxidation tests were performed at 800 and 900°C in air for 100 hr. Theresults showed that Al$\_2$O$\_3$ scalesformed on the coatings containing ~3 wt. % Al. Theoxidation rate of the coated specimens was much lowerthan that of the uncoated specimens and the scale spallationresistance was also improved significantly. Studies withatomic force microscopy (AFM) of the transient-oxidationsurfaces suggested that grain-boundary andsubgrain-boundary diffusion in the coatings may have played animportant role in promoting the formation of theAl$\_2$O$\_3$ scale. Fast creep of thefine-grain coating and alumina scale was considered tobe the mechanism for the improvement in spallation resistance.