Preparation of Al2O3/Au nano-laminated composite coatings and their oxidation resistance on stainless steel

Al2O3/Au nano-laminated composite coatings were prepared by means of magnetron sputtering. The coating was compact and comprised of nano-laminated Al2O3 and Au layers. High temperature cyclic oxidation test was employed to investigate the oxidation resistance of the composite coatings. The results r...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2012-10, Vol.22 (10), p.2491-2497
Main Authors: GAO, Jun-guo, LU, Feng, TANG, Zhi-hui, WANG, Chang-liang, HE, Ye-dong
Format: Article
Language:English
Subjects:
Al2O3/Au composite coatings
Aluminum oxide
Composite coatings
Gold
magnetron sputtering
Nanocomposites
Nanomaterials
Nanostructure
Oxidation resistance
Spallation
spallation resistance
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Summary:Al2O3/Au nano-laminated composite coatings were prepared by means of magnetron sputtering. The coating was compact and comprised of nano-laminated Al2O3 and Au layers. High temperature cyclic oxidation test was employed to investigate the oxidation resistance of the composite coatings. The results revealed that the applied Al2O3/Au nano-laminated composite coatings improved the oxidation and spallation resistance of the stainless steel substrate significantly. The mechanism accounting for oxidation resistance was related with the suppression of inward oxygen diffusion and selective oxidation of Cr in the substrate. The mechanism accounting for spallation resistance was attributed to the relaxation of thermal stress by the nano-laminated structure.
ISSN:1003-6326
DOI:10.1016/S1003-6326(11)61490-8