Abstract
Using the pressure-pulsed chemical vapour infiltration (PCVI) process, SiC was partially infiltrated into carbonized cotton–wool preforms having an initial porosity of 0.97. After 70 000 pulses of PCVI, fibrous SiC having a porosity of 0.78, an average pore size of 29 μm and a flexural strength of 15 MPa was obtained. The pressure drop was 2 kPa when air was passed through a sample of 5 mm length at a linear velocity of 1 m s −1. The pressure drop of the present sample was proportional to (1−ε) 2ε −3 D −2 f , where ε and D f were the porosity and the diameter of the fibre in the sample, respectively. The flexural strength after air-oxidation at 1000°C was close to that before oxidation.
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