【正文】 excessively is reuniting of nanoparticles. Therefore, the key to prepare excellent ceramic nanoposites is that nanopartiles are dispersed uniformly in matrix.In this article, the dispersing of ZrO2 and SiC nanometer particles in the preparation process of ZrO2/SiCMoSi2 posites were investigated with multiphase suspensions mixed. SiC and ZrO2 nanoparticles were dispersed with water and the alcohol as the dispersion medium, PEG, PAA NH 4 and PMAA NH4 as the dispersing agent. Simultaneously the effect of the surface pretreatment on the dispersive influence of SiC nanoparticles were studied. The Zeta electric potential test and the subsidence experiment indicated that the dispersibility of SiC nanoparticles can be effectively improved after calcinated at 550℃ for two hours in air. The dispersing effect of nanoparticles using water were better that using dispersion of ZrO2 is PAANH4 , the best effect of dispersing of sic is at the dispersion medium of PMAANH4 .The best effect of dispersions was in the content of %. SEM indicated that uniformly dispersed ZrO2/SiCMoSi2 nanoposite powder could be obtained by the best dispersible craf .Keyword：dispersion SiC nanoparticles ZrO2 nanoparticles MoSi2 小4號Arial BlackSignature of Supervisor:小4號Times New Roman 固定行距22pt附件設(shè)計(jì)報告內(nèi)