Dependance of pH on dispersion of SiC fine particulates in boehmite and its correlation with microstructural features of alumina

摘要

The possibility of increasing fracture toughnessand strength of alumina ceramics has been achieved recently byincorporating fine SiC particles. One of the many investigatedmethods for the synthesis of Alumina-SiC composites, is by useof pre-coated SiC powders. Gelation of boehmite (AlOOH) inpresence of SiC particles have also been attempted. The presentstudy is for obtaining stable, finely dispersed SiC particles inboehmite matrix as precursor material. The effect of pH andsolvent medium in the gelation process of boehmite-SiC mixtureare followed by optical microscopy coupled with image analysissystem and such composites after sintering are evaluated bymicrostructural observation. Structure-property correlation hasbeen obtained for highly dispersed SiC particles in alumina-SiC nano composites.