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Elimination of a zero-growth in thickness of Al2O3 protective film deposited by cycles of dip-coating method

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Abstract

Multilayered alumina film was deposited onto metallic substrate using cycles of dip-coating method. The film thickness was found not always growing linearly with the increase of the number of dipping cycles, and even a zero-growth in thickness was observed after 20 cycles of dip coatings. This phenomenon was found to be attributed to the dissolving behavior of alumina gel material in original sol. A heat treatment at a temperature higher than 230 °C was found to be able to effectively lower the dissolvability of Al2O3 gel material, but an extra high temperature, i.e., 600 °C led to the formation of cracks in the multilayered film due to the increase of interfacial tension force. It was examined by IR and XRD analyses that a heat treatment at 250 °C for 10 min before each coating process could yield an amorphous multilayered film with no crack formed after calcinations at 600 °C. A crack-free Al2O3 film with a thickness up to 2 μm after 22 cycles of dip coating process could be produced and it showed an excellent antioxidation performance for steel substrate.

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Acknowledgments

This work was financially supported by the Key Project of Wuhan City for International Cooperation, P.R. China No. 981001009, Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT), and the Doctoral Fund of Qingdao University of Technology & Science, P.R. China.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Qingdao University of Technology and Science, 53 Zheng-zhou Road, Qingdao, 266042, P.R. China

    Chengbin Jing & Yongheng Zhang

  2. Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education, Wuhan University of Technology, Wuhan, Hubei, P.R. China

    Xiujian Zhao

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  1. Chengbin Jing
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  2. Xiujian Zhao
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  3. Yongheng Zhang
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Correspondence to Chengbin Jing.

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Jing, C., Zhao, X. & Zhang, Y. Elimination of a zero-growth in thickness of Al2O3 protective film deposited by cycles of dip-coating method. J Sol-Gel Sci Technol 42, 151–156 (2007). https://doi.org/10.1007/s10971-007-1533-y

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  • DOI: https://doi.org/10.1007/s10971-007-1533-y

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