MICRO-LAMINATED(ZrO2–Y2O3)/(Al2O3–Y2O3)COATINGS ONFe–25CrALLOY AND THEIR HIGH TEMPERATURE OXIDATION RESISTANCE

Mingming Yao (), Fang Li, Ying Zhang and Yedong He
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Mingming Yao: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
Fang Li: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
Ying Zhang: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
Yedong He: Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, University of Science and Technology Beijing, Beijing 100083, China

Surface Review and Letters (SRL), 2007, vol. 14, issue 03, 499-505

Abstract: The micro-laminated(ZrO2–Y2O3)/(Al2O3–Y2O3)composite coatings were prepared on the surface ofFe–25Cralloy by an electrochemical process and a sintering process alternately. FE-SEM analyses show that the cross section of the micro-laminated coatings has alternate six-layer films ofZrO2–Y2O3andAl2O3–Y2O3, with the thickness of each layer in the range of nanometer or submicron. The surface of the micro-laminated coatings is composed of nanoparticles. SEM, XRD, and mass gain measurements were adopted to study the oxidation resistance of coatings on theFe–25Cralloy. It has been found that all the coatings are effective in protecting the substrate from oxidation, and micro-laminated coatings exhibit more excellent protectiveness performance, and the oxidation resistance is increased with increasing the layers of the micro-laminated coatings. These beneficial effects can be contributed to the mechanism, by which such a micro-laminated coating synthesizes all the beneficial effects and overcomes all the disadvantages of both theZrO2–Y2O3coating and theAl2O3–Y2O3coating during the oxidation of the alloy.

Keywords: Micro-laminated coating; (ZrO2–Y2O3)/(Al2O3–Y2O3); high temperature oxidation; Fe–25Cralloy (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0218625X07009475

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