Chemical Stability between Y<SUB>2</SUB>SiO<SUB>5</SUB> and SiC in an Oxidation Protection System for Carbon/Carbon Composites

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  • Kondo Masayuki
    Advanced Technology Research Center, Mitsubishi Heavy Industries, Ltd.
  • Ogura Yuzuru
    Advanced Technology Research Center, Mitsubishi Heavy Industries, Ltd.
  • Morimoto Tatsuo
    Advanced Technology Research Center, Mitsubishi Heavy Industries, Ltd.

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  • Chemical Stability between Y2SiO5 and SiC in an Oxidation Protection System for Carbon/Carbon Composites
  • Chemical Stability between Y2SiO5 and S

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Abstract

As an oxidation protection system for Carbon/Carbon composites beyond 1800 K, the authors have proposed a Y2SiO5 oxidation protection coating system, which is a multilayer coating system composed of a Y2SiO5 outer layer and a SiC inner layer. For realization of Y2SiO5 coating system, chemical stability of Y2SiO5 on SiC and adhesion between the Y2SiO5 layer and the SiC layer are required at elevated temperatures. In order to investigate chemical stability of the interface between the Y2SiO5 layer and the SiC layer, two types of Y2SiO5 contacted with a SiC substrate were heated in some atmospheres. The interface between Y2SiO5 and SiC is chemically stable at 2073 K for more than 3.6 ks in Ar. In some conditions, Y2SiO5 reacts with the SiC substrate, and the reaction produces CO gas, SiO gas and YSix, which is a compound composed of Y, Si, C and O. The YSix/SiC layer composed of YSix and SiC is formed on surface of the SiC substrate by the reaction, and adheres intensively to the SiC. The YSix/SiC layer may be useful for adhesion between Y2SiO5 layer and SiC layer in the Y2SiO5 coating system.

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