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Journal of Sol-Gel Science and Technology

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01-07-2008 | Original Paper

Sol–gel Al₂O₃/ZrO₂ duplex films for protection of a γ-TiAl based alloy against high temperature oxidation

Authors: X. J. Zhang, Q. Li, S. Y. Zhao, C. X. Gao, Z. G. Zhang

Published in: Journal of Sol-Gel Science and Technology | Issue 1/2008

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Abstract

Al₂O₃/ZrO₂ duplex films were deposited on a γ-TiAl based alloy by sol–gel processing starting from aluminum isopropoxide (Al(OC₃H₇)₃) and zirconium (IV) oxychloride octahydrate (ZrOCl₂ · 8H₂O) as raw materials. Isothermal oxidation at 900 and 1,000 °C in 0.1 MPa O₂ and cyclic oxidation at 1,000 °C in air of the coated and uncoated specimens were performed to investigate the effect of the duplex films on the oxidation behavior of the γ-TiAl alloy. The results of the isothermal oxidation tests indicated that the parabolic rate constants of the alloy were decreased due to the applied thin film. Additionally, the present film exhibited a beneficial effect on the cyclic oxidation resistance of the alloy in air. The duplex film could restrain the growth of TiO₂, causing an increase of the Al₂O₃ content in the oxide mixture and thus decreased the oxidation rate.

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Title: Sol–gel Al2O3/ZrO2 duplex films for protection of a γ-TiAl based alloy against high temperature oxidation
Authors: X. J. Zhang
Q. Li
S. Y. Zhao
C. X. Gao
Z. G. Zhang
Publication date: 01-07-2008
Publisher: Springer US
Published in: Journal of Sol-Gel Science and Technology / Issue 1/2008
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-008-1744-x

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