LI Xiaolong, ZHOU Jianer, XIAI Zhuohao, BAO Qifu

(School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi 333001)

Abstract: The ceramic membrane for high temperature dust -laden exhaust gas purification was prepared on porous cordierite ceramic by dip-coating method, using cordierite powder as the main raw material. The effects of different dispersants, sodiumpolyacrylate content and pH value on the stability of cordierite slurry were discussed. The influence of dip-coating time, solid content and viscosity of slurry on the thickness of membrane was studied. The effect of the sintering schedule on the membrane-substrate bonding was observed. The result showed that the slurry with the highest stability was obtained with a pH of 8, 0.16wt.% polyacrylate sodium and 14wt.% cordierite. The thickness of the membrane could be better controlled between 70~80μm when the dip-coating time was 15s. Heat soaking at 1240~1260℃ for 60min could produce better membrane-substrate bonding.

Key words  cordierite; dip-coating method; filtering membrane