The use of ceramic composite materials in aerospace applications requires the development of oxidization protection coatings which can withstand very high temperatures. HfO2 is a promising material as a high temperature oxidization protective layer. HfO2 coatings have been deposited by radiation frequency magnetron sputtering all over the surface of SiC substrates and were tested under re-entry conditions. Also their oxidization resistance in air in the temperature range 1100 to 1450 deg C has been examined. The coatings were found to be stable and well-adhering to the substrate even after 100 re-entry cycles. No oxidization of the underlying SiC structure is observed. Re-entry and oxidization tests result in the formation of HfSiO4 at the HfO2/SiC interface, which further promotes their oxidization resistance.


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    Titel :

    Thermo-mechanical behaviour of HfO2 coatings for aerospace applications


    Weitere Titelangaben:

    Thermomechanisches Verhalten von HfO2-Beschichtungen für Raumfahrtanwendungen


    Beteiligte:
    Mergia, K. (Autor:in) / Liedtke, V. (Autor:in) / Speliotis, T. (Autor:in) / Apostolopoulos, G. (Autor:in) / Messoloras, S. (Autor:in)


    Erscheinungsdatum :

    2008


    Format / Umfang :

    5 Seiten, 7 Bilder, 9 Quellen





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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