Abstract
The following technique is known to synthesize C/C (carbon fiber-reinforced carbon) composites. The organic matter in the preformed yarn (plastic straw covered yarn including bundles of long carbon fibers, carbon powder, and organic binder) is pyrolyzed at 500 °C and concurrently hot-pressed. Then, the carbon ingredient is graphitized in an atmosphere of nitrogen at 2000 °C. The authors used the above mentioned C/C composites as a starting material and developed a dense Si–SiC matrix C/C composites in which most long carbon fibers remain without reacting with Si which is infiltrated in argon at 1600 °C and 100 Pa. As a result, production of 1 × 2 m large size plates free from warps and cracks was attained in NGK Insulators, Ltd. This mechanism consists of three steps. First, a trunk-shaped Si–SiC matrix is synthesized between yarn and yarn. Then a trunk-shaped Si–SiC matrix extends a yarn by force. Only differential gap is made in a yarn surface. Finally, branch-shaped Si–SiC matrix is synthesized so that a trunk-shaped Si–SiC matrix leads to the yarn inside.
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Acknowledgements
The author thanks Mr. T. Mizutani, Mr. T. Mizuno and Mr. T. Inaba, Directors of NGK Ins., and Dr. T. Nakagawa, President of Across, for their kind permission to publish this article. The Author also thanks Dr. T. Ohta and Dr. N. Ishizawa, Professors of Nagoya Institute of Technology, and Dr. H. N. Ko, Professor of Nakanihon Automotive College, for their advice in preparation of this article. Lastly, thanks to Mr. Jim V. Castle for proofreading of final document.
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Hanzawa, S. Mechanism of synthesizing dense Si–SiC matrix C/C composites. J Mater Sci 47, 833–844 (2012). https://doi.org/10.1007/s10853-011-5861-5
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DOI: https://doi.org/10.1007/s10853-011-5861-5