The preparation and mechanical properties of silicon infiltrated SiC-B 4 C composite were studied in the present work. Gelcasting process was adopted to obtain green bodies with uniformity and compaction. The gelation behaviour of the slurry was controlled by introducing the polymerisation inhibitor mixture and the gelation reaction was delayed to about 10 min with increasing B 4 C content from 20 to 40%. Mechanical properties of the SiC-B 4 C sintered samples were tested and the results showed that increasing B 4 C content led to an increase in bending strength, fracture toughness and hardness. Microstructure investigation revealed that the SiC-B 4 C composites showed less content of free silicon and finer grains comparing to RBSC ceramics.
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