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

目的是将sp2杂化碳的共价碳-碳键的独特潜力转移到高性能材料中，例如碳纤维增强碳。这些研究是基于使用化学气相沉积从轻质烃（例如甲烷）从气相形成碳。为了实现预期的目标，从轻烃的碳形成的均相和非均相基元反应，所形成的热解碳的微观和纳米结构以及基元反应和结构之间的相关性进行了研究。所得知识用于基于模型的碳纤维增强碳的化学气相渗透碳纤维预制件的优化合成。优化的合成意味着高的渗透速率、均匀的致密化和渗透碳的期望的、明确的微观结构或纹理，其可以从各向同性到高度纹理化变化。由具有明确纹理的碳纤维和热解碳组成的复合材料，从涂覆的单丝到具有复杂纤维结构的复合材料，通过测定纳米和微观结构以及纳米、微观和宏观力学性能来表征。这些数据被用来开发碳纤维增强碳的结构-性能关系和破坏行为的模型。

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.