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Deposition of Silicon Carbide and Nitride-Based Coatings by Atmospheric Plasma Spraying

Authors

  • Zoltán Károly,

    Corresponding author
    • Chemical Research Center, Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Budapest, Hungary
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  • Cecília Bartha,

    1. Chemical Research Center, Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Budapest, Hungary
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  • Ilona Mohai,

    1. Chemical Research Center, Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Budapest, Hungary
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  • Csaba Balázsi,

    1. Research Institute for Technical Physics and Materials Science, Budapest, Hungary
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  • István E. Sajó,

    1. Chemical Research Center, Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Budapest, Hungary
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  • János Szépvölgyi

    1. Chemical Research Center, Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Budapest, Hungary
    2. Research Institute of Chemical and Process Engineering, University of Pannónia, Veszprém, Hungary
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karoly@chemres.hu

Abstract

In this work atmospheric plasma spraying of SiC and Si3N4 was investigated. Plasma spraying of these ceramics raises several problems since they would tend to decompose instead of melting at elevated temperatures during the process. To circumvent this problem the nonoxide ceramics were deposited as a composite powder mixed with nonoxide ceramic particles resulting in a ceramic/ceramic composite structure. Our findings were that using such a composite feedstock powder both oxidation and decomposition of the nonoxide particles could be avoided. A vitrified phase was also developed in the coating.

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