炭素繊維のTiCコーティング

概要

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TiC coating of carbon fiber is one of the method to improve bonding and wetting of the fiber to metal materials like Al. In the present work, chemical vapor deposition of TiC on high strength carbon fibers (360 kg/mm2) tows, was examined by the reaction of TiCl4 and CH4 or of TiCl4 and carbon fiber itself at 1000-1050℃. The reactant gas was diluted with H2 or N 2. The electric furnace used was horizontal or vertical. In the case of the deposition by the TiCl4-CH4-H2 system, very rough TiC coatings of 2-3μm in thickness were formed on the outer fibers of the tow, though the deposition was very sparse on the inner fibers. However, the adhesive property of the coating to the carbon fiber was very poor, and some interfacial cracks were observed between the fiber and the coating. Tensile strength of the fiber・ decreased to 260-300 kg/mm2 after coating treatment. In case of the reaction of TiCl4 and carbon fiber itself in a hydrogen carrier, on the other hand, relatively smooth coatings were obtained throughout the fibers tow, and there were no interfacial cracks. However, tensile strength markedly decreased to 80-120 kg/mm2 because of the reaction of carbon fiber itself. Use of nitrogen carrier in place of hydrogen resulted less formation of the TiC coatings.
長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文