Abstract：SiC whiskers were used as reinforeements，C—coated SiC whiskers was fabricated by the pyrolysis of phenolic resin，then mixed with nano silicon carbide powder and carbon black to form composite ceramic ethanol slurry，SiCw-C—SiC green body obtained after drying，granulating，fornfing and arranging．A high-volume fraction of SiC whisker reinforced SiC ceramic matrix composites was prepared by reactive melt infiltration．The effect of carbon black content on the mechanical properties and microstrueture of the composites was investigated．The SEM images show that the C—coated SiC whiskers retain the bamboo—like morphology after high temperature reactive melt infiltration．Significant whiskers pullouts at the fracture of the material，indicating an appropriate bonding strength between the whisker and the SiC matrix．When the carbon black content is 15wt％，the flexural strength and fracture toughness reach the highest values of 3 15 MPa and 4.85 MPa·m½。respectively，which is 25％higher than that of SiC ceramics without whiskers，and the fracture toughness increases by 15％．When the carbon black content is 20wt％，the unreacted carbon black remains in the composites，which restricts the improvement of mechanical properties．
Key words：SiC whisker；reactive melt infiltration；C—coating；carbon content；SiC composite ceramic
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