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Twin-Structured Yttria-Stabilized t′ Zirconia Coatings Deposited by Plasma Spray Physical Vapor Deposition: Microstructure and Mechanical Properties

Authors

  • Jianqiang Li,

    1. Department of Materials Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656 Japan
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    • Present address: Laboratory of Multiphase Reactions, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100080 China.

  • Heji Huang,

    Corresponding author
    1. Department of Materials Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656 Japan
      †Author to whom correspondence should be addressed. e-mail: huang@plasma.t.u-tokyo.ac.jp
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  • Tian Ma,

    1. Department of Materials Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656 Japan
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  • Keisuke Eguchi,

    1. Department of Materials Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656 Japan
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  • Toyonobu Yoshida

    1. Department of Materials Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656 Japan
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  • K. Faber—contributing editor

  • This work was supported by NEDO's “Nano-coating Project” and partially by MEXT's Grants-in-Aid for Scientific Research (No. 16.04105).

†Author to whom correspondence should be addressed. e-mail: huang@plasma.t.u-tokyo.ac.jp

Abstract

In this work, we report a twin-structured yttria-stabilized t′ zirconia (YSZ) coating which was fabricated through an advanced plasma spray physical vapor deposition process with a high-power hybrid plasma spraying system. The as-deposited YSZ structure, entirely different from those deposited by conventional atmospheric plasma spraying and electron beam physical vapor deposition, is characterized by coarse grains of over 5 μm size which compose the entire coating, differently sized t′-ZrO2 twins which fill the coarse grains, and micron-scaled lenticular t′ colonies in which twins on the submicrometer scale arrange alternatively. The indentation tests show that both the nanohardness and microhardness of the peculiar coating are markedly higher than those of the ordinary YSZ coatings, even comparable with those of the sintered YSZ polycrystal bulks.

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