Abstract
Carbon-SiC-B4C composite materials were prepared from ground powder mixtures of petroleum raw coke, SiC and B4C by powder sintering, without the use of any special binder and hot-pressing process. Dense composites with a fine microtexture were obtained. Oxidation tests were carried out on the composites at temperatures from 1000 to 1300° C under an air flow. The oxidation resistance depended strongly on the SiC/(SiC + B4C) ratio and total contents of SiC and B4C in the composites, which determined the compositions of B2O3 and SiO2 in the protective film formed at the surface of the composite block during oxidation. In optimum ratios, from 63 to 87%, the composites showed such a high oxidation resistance that they were comparable with Si3 N4 at 1200° C.
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