Abstract: The character of dispersion of SiC whiskers in mullite slurry was studied. The relationship between pH value or/and dispersant and dispersion of SiC whisker was discussed via
the sedimentation experiment and rheology test. The results show that the rheological properties of the mullite slurry are affected by the addition
of the whisker. Well dispersed slurry can be obtained with pH value and dispersant content as 11wt% and 5wt%, respectively. The dispersion techniques
in the study can improve the character of dispersion of SiC whisker in mullite slurry, increasing the structure uniformity of the slurry.

Key words: Mullite, SiC whisker, dispersant, sedimentational volumn