一軸配向短繊維強化炭化ケイ素複合材料の機械的及び熱的性質に与える繊維含有量の影響

概要

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The aim of this study were to fabricate a short-fiber-reinforced SiC composites by hot-pressing using an Al_2O_3-Y_2O_3-CaO mixture as sintering additive, and, to investigate the effect of processing parameters on the mechanical and thermal properties of SiC/SiC composites containing BN-coated Hi-Nicalon short fibers. Fibers were mostly aligned within planes perpendicular to the hot-pressing direction. The composite fabricated by this process achieved nearly full density after hot-pressing at 1700℃. The bending strength increased with increasing sintering temperature and decreased with increasing testing temperature. The fracture behavior of the SiC/SiC composites showed a completely brittle fracture. Results of scanning electron microscopy (SEM) investigation showed that there were pulled-out fibers in the tensile stress zone of the fracture surface, but the degree of pull-out was low. On the basis of these results, the influence of fiber volume fraction on the mechanical and thermal properties of the SiC/SiC composites is discussed.
2002-11-01