Abstract
Composites with boron carbide (B4C) as the matrix and short carbon fiber (Cf) as reinforcement in 2, 5 and 10 vol% were fabricated by hot pressing route. Microstructural analysis by scanning electron microscopy reveled that Cf got aligned perpendicular to the hot press direction. Agglomeration of Cf was observed at 10 vol% Cf. The addition of Cf improved the flexural strength of B4C-Cf composite and was superior to that of B4C-CNT composite. On other hand, the hardness and fracture toughness of B4C-Cf composite were inferior to that of B4C-CNT composite. The tribological studies revealed that B4C-CNT had superior wear resistance. Both B4C-Cf and B4C-CNT had lower coefficient of friction than monolithic B4C. The possible reasons for deviation of properties due to change in length scale of carbon reinforcement has been analyzed.
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