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Densification of Short Carbon Fiber Reinforced Silicon Carbide by Spark Plasma Sintering

By using spark plasma sintering technique, densification of SiC reinforced with unidirectional short carbon fibers has been investigated. Graphite with Al2O3 or AlN, respectively are selected as the additives for achieving highly relative densities and thus improve their mechanical properties. The effect of these additives on the densification of short-Cf/SiC composites are mainly discussed, and the influences on the carbon fibers as well as the interfaces between fibers and SiC matrix are also studied. The results show that the (3~5)wt%Al2O3+1wt%graphite is confirmed to be an optimum additive system for the densification of short-Cf/SiC composite and the relative density approaches 95%.