Chemically modified polycarbosilane containing organofluoric groups, PCOCF, was synthesized and used as a compaction binder for SiC ceramics. The powder fluidity and the powder packing property were evaluated by measuring angle of repose, tap density, green density and pore size distribution of both the binder coated powders and the compacts. The PCOCF coated SiC powder showed improved fluidity and packing property, owing to the organofluoric side chains of PCOCF. Thus, the PCOCF coating was found to be the most effective among other binders to lubricate the SiC particles, which results in a higher compaction under the same loading conditions. The compact of PCOCF coated SiC powder contains only homogeneously dispersed small pores, and therefore, the mechanical strength of the sintered body can be improved, the scatter in bending strength values being also significantly reduced due to the PCOCF coating.
