SFB 551: Carbon from the gas phase: elementary reactions, structures, materials

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It is the aim to transfer the unique potential of the covalent carbon-carbon bond of sp2-hybridized carbon into high performance materials, for example carbon fiber reinforced carbon. The studies are based on the formation of carbon from the gas phase using chemical vapor deposition from light hydrocarbons such as methane. To achieve the desired aim, homogenous and heterogeneous elementary reactions of carbon formation from light hydrocarbons, micro- and nanostructures of the formed pyrolytic carbon as well as correlations between elementary reactions and structures are investigated. Resulting knowledges are used for a model based, optimized synthesis of carbon fiber reinforced carbon by chemical vapor infiltration of carbon fiber preforms. Optimized synthesis implies high infiltration rates, homogeneous densification and desired, well-defined microstructure or -texture of the infiltrated carbon, which may vary from isotropic to highly textured.Composites consisting of carbon fibers and pyrolytic carbon of well-defined texture, ranging from coated monofilaments up to composite materials with a complex fiber architecture, are characterized by determination of nano- and microstructural as well as nano-, micro- and macromechanical properties. The data are used to develop structure-property relationships and models of failure behavior of carbon fiber reinforced carbon.