A new type of precursor for fibers in the system Si–C |
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| Affiliation: | 1. Laboratoire des Composites Thermostructuraux (LCTS), UMR 5801, CNRS-SAFRAN-CEA-UB, 3 allée de la Boétie, 33600, Pessac, France;2. Safran Ceramics, Rue de Touban – Les Cinq Chemins 33185, Le Haillan, France;3. Laboratoire de Mécanique et Technologie (LMT), UMR 8535, CNRS-ENS-UPMC, 61 Avenue du Président Wilson, 94235, Cachan, France;1. Department of Industrial Engineering, University of Padova, via Marzolo 9, Padova 35131, Italy;2. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;3. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16801, USA;1. Materials Science Division, CSIR-National Aerospace Laboratories, Bangalore 560017, India;2. School of Materials Science and Engineering, National Institute of Technology, Calicut 673601, India |
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| Abstract: | Ceramic fibers with compositions in the system Si–C have a great potential for high-temperature applications. In recent years, our efforts have been dedicated to the development of polymers consisting of polysilanes suitable to spin fibers and build up matrices for CMC as well. The polysilanes are synthesized via disproportionation of the so-called disilane fraction Richter, R., Roewer, G., Böhme, U., Busch, K., Babonneau, F., Martin, H.-P. et al., Appl. Organomet. Chem., 1997, 11, 71 (and references cited therein)]. A further thermal treatment yields materials which are soluble in organic solvents, and these solutions can be dry-spun to give fibers which are subsequently pyrolyzed. Solubility and high ceramic yield make this precursor a promising candidate for matrix infiltrations, too. The chemistry and the adjustment of viscosity and solubility to the requirements of the fiber processing as well as the conversion of the dried fibers to pure SiC fibers by thermal treatment will be reported. |
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