表面に炭素質を有するSi-Ti-C-O繊維を用いた繊維強化ガラス複合材の製造とその力学的特性

概要

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Four types of glass matrix composites (GMC) were fabricated to investigate the effect of the fibre/matrix interface on the mechanical property of GMC. Pyrex was used as the matrix and an Alumina fibre, a carbon fibre, and two different types of Si-Ti-C-O fibre (F and S grade) were used as the reinforcement. Alumina fibre/pyrex composite was the poorest GMC of all, which failed catastrophically with low strength. Other three GMCs performed well, in particular, F grade Si-Ti-C-O fibre/pyrex composite showed high strength with woody fracture manner. The fibre had a very thin carbon layer on its surface, and an interface carbon layer which had relatively weak interfacial bond between the fibre and the matrix seemed to be formed easily when fabricated. The high temperature flexural strength of F grade Si-Ti-C-O fibre/pyrex composite increased drastically at about 400°C and then decreased as the test temperature increased. The poor oxidation resistance of the carbon fibre/pyrex composite was due to that of the fibre itself, while the oxidation resistance of the Si-Ti-C-O fibre/pyrex composites seemed to depend upon that of the interface layer. The Si-Ti-C-O fibre/pyrex composites retained their strengths for more than 100 hours in air at 500°C.
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