Influence of ceria and yttria on the protective properties of SiO₂–Al₂O₃ coatings deposited by sol–gel method on FeCrAl alloy

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• 作者：Jacek Chęcmanowski ; Aleksandra J. Pelczarska…
• 关键词：Ceramics ; Sol–gel method ; FeCrAl ; SiO2–Al2O3–CeO2–Y2O3 coating ; High ; temperature corrosion
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：126
• 期：2
• 页码：371-380
• 全文大小：1,381 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943
• 卷排序：126

文摘

Three-layer Y₂O₃, CeO₂, SiO₂–Al₂O₃ and SiO₂–Al₂O₃–Y₂O₃–CeO₂ coatings were deposited by sol–gel method on the FeCrAl alloy foil substrate. The protective properties of the coatings during high-temperature cyclic oxidation and the changes in the topography of the surface, the structure, and chemical composition of the FeCrAl alloy surface layer were examined. It has been shown that small additions of cerium and yttrium affect the morphology of the growing Al₂O₃ scale. After 10 oxidation cycles in air (T = 900 °C, t = 120 h, one cycle = 12 h), the smallest change in the mass of the samples was observed for Y₂O₃ and SiO₂–Al₂O₃–Y₂O₃–CeO₂ coatings with an appropriate yttrium and cerium content. The protection effectiveness of the coatings to that of uncoated substrate after 10 oxidation cycles ranges from 28 to 66 %. The oxidation scale thickness (h) and the designated value of the parabolic rate constant (k_p) depended on the yttrium and cerium content in the coating.