Ceramic-matrix composites (CMC’s), mainly, SiC/SiC_f or SiC/C_f are advanced structural materials that have the high strength, toughness and low density. There are three critical components to CMC’s, namely, reinforcement (carbon, SiC fiber), the interface coating and SiC matrix. The overall mechanical behavior, the environmental stability and the failure mechanisms of fiber-reinforced CMC’s are strongly influenced by the interfacial phenomena at the fiber/matrix boundary. A weakening the fiber/matrix bond is a well-established requirement in CMC’s. This is achieved through a disposal of the special coating on each carbon or SiC filament. The design and development of appropriate candidates for interphase materials and the development of the appropriate techniques for the coating deposition will be discussed in details. It is shown that SiC/SiC composites with appropriate interphases display a nonbrittle damage behavior and the extensive pull-out phenomenon is observed.

            Another important component of CMC’s is SiC matrix. The results of the infiltration of SiC matrix in the fiber architecture by polymer infiltration and pyrolysis (PIP) technique will be also presented.

          For many reinforcement problems a carbon monofiber is required. We received some rather promising results which demonstrate the possibility to manufacture single carbon fibers from a coke peach as a precursor. This kind of fiber may be cheap enough to use it as a corn for SiC deposition. A successful technological progress in monofiber production is necessary to provide multiple industrial applications with reinforced plastics.

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1. Characterization of nanoscale properties of the interfacial coatings on SiC reinforced fibers for CMC's