ZHANG Xiaozhen, ZHANG Wanglin, WU Junling, ZHOU Jianer, WU Chunrong, JIANG Yuhua
(Key Laboratory of Jiangxi Universities for Inorganic Membrane, School of Materials Science and Engineering, Jingdezhen Ceramic
Institute, Jingdezhen 333403, Jiangxi, China)
Abstract: Macroporous La0.7Ca0.3CrO3 (LCC)-based supports for conductive ceramic MF membrane were prepared by high temperature solid-state reaction sintering technique. The influences of Al2O3 content on the phase composition, microstructure, electric conductivity,porosity and pore size distribution, pure water permeate flux, bending strength, and corrosion resistance of the prepared supports were investigated. X-ray diffraction analysis showed that the sample was composed of orthorhombic structured La0.7Ca0.3Cr1-xAlxO3 (LCCA) phase with a small amount of Al2O3 addition sintered at 1550 °C for 2 h. When the Al2O3 content was increased to 30~50wt.%, complex solid reactions between La0.7Ca0.3CrO3and Al2O3occurred during the sintering process, and LaAl11O18 and CaCr2O4 phases were also formed besides the main LCCA crystalline phase. The addition of Al2O3could improve the sinterability of LCC-based materials, and the porosity, mean pore size, bending strength, pure water flux and acid corrosion resistance of the samples are significantly increased. The sample shows the maximal electrical conductivity of 1.92 S/m with the addition of 10wt.% Al2O3.
Key words: ceramic microfiltration membrane; support; lanthanum calcium chromite; alumina; electrical conductivity