Properties of C/C-SiC composites produced via transfer moulding and inner siliconization |
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Authors: | Husam Ahmad Jonas Stiller Erik Päßler Daisy Nestler Lothar Kroll Guntram Wagner |
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Affiliation: | 1. Institute of Material Science and Engineering, Chemnitz University of Technology, Chemnitz, Germany;2. Institute of Lightweight Structures, Chemnitz University of Technology, Chemnitz, Germany |
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Abstract: | Short carbon fiber reinforced polymers (CFRP) are successfully prepared by transfer moulding technology. For this purpose, compounds on the basis of novolac/urotropin with different 6 mm chopped carbon fibers and silicon powder contents are produced utilizing a laboratory tempered sigma-blade kneader. These compounds are then shaped into 46 × 8 × 3 mm3 CFRP specimens using a transfer moulding machine. Depending on the material composition, the conversion to C/C-SiC composites is performed through liquid silicon infiltration (LSI) process or inner siliconization. First, the short fiber content is varied between 30 and 50 wt% and its influence on the process and properties of the composites is studied. Second, an investigation of the inner siliconization through the co-mixing of silicon powder (1-23 wt% in CFRPs) during the compound production as well as a comparison with the external silicon infiltration process are presented and discussed. According to the results, the best mechanical properties are achieved at a fiber content of 40 wt% in the case of the external silicon infiltration and at silicon content below 14 wt% for composites produced by the inner siliconization process. |
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Keywords: | carbon fibers ceramic matrix composites inner siliconisation manufacturing |
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