Structure and Oxidation Behavior of Carbon/Ceramic Composite Material Synthesized by Spark Plasma Sintering

概要

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Using coke, together with SiC or B_4C powders as raw materials, carbon/ceramic composites were prepared by a spark plasma sintering process of a short duration. The oxidation resistance of the composite containing B_4C powder was higher than that of the composite containing SiC powder. The temperature at which the weight decrease of the composite containing 10 wt% B_4C powder began shifted to the high-temperature side compared with that of the carbon material composed only of coke. Approximately 44% of the initial weight of the specimen remained even after thermogravimetric analysis in air up to 1000 ℃. By X-ray diffraction analysis, diffraction peaks corresponding to B_2O_3 were observed. This finding indicates that B_4C in the composite is oxidized to B_2O_3, which then forms an oxidation-resistant film, leading to an increase in the oxidation resistance of the composite.