CHENG Benjun ¹, GUO Xingzhong ¹, YANG Hui ¹, LIU Daming ²

(1.Center for Nano- Science  and Nano- Technology, Zhejiang University, Hangzhou 310027; 2.Anji

Keling magnetic  materials  Co.Ltd.，313301)

Abstract: Silica  sol (SiO₂) is added into corundum- mullite materials by sol- gel technology,and the effect mechanism of silica sol on the properties of corundum - mullite ceramics was investigated.  The  results show that SiO₂ sol forms sub- μm  film on corundum- mulliteparticles,improve homogeneous  dis tribution of SiO₂ in the materials and controls the microstructure of the materials.SiO₂ sol can not only improve The thermal shock resistance of mullite - corundum duplex ceramic, but also increase high modulus of rupture and creep property.The formation of mullite by the reaction of silica sol and micro - cracks are the main reasons for improving thermal shock resistance of corundum- mullite duplex ceramics.

Keywords: SiO₂sol, mullite- corundum, duplex ceramics