Environmental barrier coating of SiC fiber-reinforced ceramic composite material and its manufacturi

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PROBLEM TO BE SOLVED : To improve the ununiformity in the wettability of the surface in a silicon carbide fiber-reinforced ceramic matrix composite (CMC), at the time when a steam corrosion resistance coating (EBC) is applied to the surface of the CMC via crystallized glass (BMAS), and to realize the coating with a uniform thickness. SOLUTION : In the coating, on the surface layer of an SiC-based fiber-reinforced ceramic (CMC) base material 1, an intermediate layer composed of a layer 4 impregnated with a mixture of the crystallized glass (BMAS) composed of BaO-MgO-Al2O3-SiO2and a rare earth silicate, and a CVD-SiC layer 2 obtained by impregnating an SiC layer with a mixture of BMAS and a rare earth silicate, deposited so as to be the porous one on the surface of the base material by a CVD process is formed, and a rare earth silicate layer 5 is further formed on the CVD-SiC layer 2 as a top coat. COPYRIGHT : (C)2006, JPO&NCIPI