WANG Yongqin ,WANG  Jinming, SHI Qun ,CHEN  Ziqian,RAO Hui

(Jingdezhen Ceramic Institute, Jingdezhen 333001)

Abstract:The α-Al₂O₃ microfiltration membranes with good bending strength and acid-resistance were prepared by a solidphase sintering method using 20μm α-Al₂O₃ powder as main raw material and titanium, light-burned magnesia powder and titanium sol as microfiltration membrane additives. The effects of the additives on the scheme of sintering and acid/base resistance were discussed. The results show that the microfiltration membrane of Al₂O₃-Ti sol system has the porosity of 26%, the bend strength of 50Mpa and good acid/alkali resistance, when cacined at 1450℃ with 5wt% titanium sol as a sintering aid. The microfiltration membrane of Al₂O₃-MgO-ZnO₂ system has the porosity of 25%, the bend strength of 80Mpa and good acid/alkali resistance, when cacined at 1500℃ with 4wt% MgO and 1 wt% ZnO₂ as sintering aids.

Keywords:alumina, microfiltration membrane, acid/alkali resistance, titanium sol, MgO powder