CVI法及びPIP法により作製されたSiC繊維強化SiC複合材料の室温及び高温での機械的性質

概要

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The three-point bending strength of two-dimensional SiC fiber-reinforced SiC composites (SiC/SiC_f) fabricated by chemical vapor infiltration (CVI) method and polymer infiltration and pyrolysis (PIP) method was measured at room and high temperatures up to 1600℃ and the fracture behavior was investigated. The maximum strength of the CVI-SiC/SiC_f composite with carbon-coated Hi-Nicalon cloth was maintained at around 200 MPa up to 1600℃. The fracture behavior of the CVI-SiC/SiC_f composite showed non-brittle characteristics with fiber pull-out up to 1500℃, whereas it showed brittle fracture at 1600℃. On the other hand, the maximum strength of the PIP-SiC/SiC_f composite increased gradually from 40 to 70 MPa with increasing test temperature, due to the crystallization of the matrix. The PIP-SiC/SiC_f composite with carbon-coated Hi-Nicalon had higher strength and fracture energy than that with non-coated Hi-Nicalon. The PIP-SiC/SiC_f composite with carbon-coated Hi-Nicalon showed non-brittle fracture up to 1400℃, whereas that with non-coated Hi-Nicalon showed almost brittle fracture at room and high temperatures, except at 1400℃. The PIP-SiC/SiC_f composite significantly differed from the CVI-SiC/SiC_f composite in maximum strength. This could be mainly explained by bulk density.
2000-03-01