Al_2O_3添加对La_(0.7)Ca_(0.3)CrO_3基导电陶瓷膜支撑体结构与性能的影响  

Effect of Al_2O_3 Addition on Structure and Properties of La_(0.7)Ca_(0.3)CrO_3–based Support for Porous Conductive Ceramic MF Membranes

作　　者：张小珍 张王林 伍军玲 周健儿 巫春荣 江瑜华 

机构地区：[1]景德镇陶瓷大学材料科学与工程学院江西省高校无机膜重点实验室,江西景德镇333403

出　　处：《陶瓷学报》2016年第6期641-646,共6页Journal of Ceramics

基　　金：国家自然科学基金(51262012;51462012);江西省自然科学基金重大项目(20143ACB21022);国家大学生创新训练计划项目

摘　　要：通过高温固相反应烧结法制备了多孔La_(0.7)Ca_(0.3)CrO_3(LCC)基导电陶瓷微滤膜支撑体。研究了Al_2O_3添加量对制备的支撑体样品的物相组成、微观结构、电导率、孔隙率和孔径分布、渗透性能、抗弯强度及耐腐蚀性能等的影响。XRD分析表明,添加少量Al_2O_3时,在1550℃时保温2 h烧成制备的支撑体样品由正交晶系结构的La_(0.7)Ca_(0.3)Cr_(1-x)Al_xO_3(LCCA)晶相组成。当Al_2O_3添加量提高到30-50wt.%时,高温烧成过程中LCC与Al_2O_3发生复杂的固相反应,除LCCA主晶相外,还生成了LaAl_(11)O_(18)和CaCr_2O_4等晶相。适量Al_2O_3的添加可改善LCC基材料的烧结性能,支撑体样品的孔隙率和平均孔径、抗弯强度、纯水渗透通量和耐酸腐蚀性能明显提高。Al_2O_3添加量为10 wt.%时,样品表现出最高的电导率1.92 S/m。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 ℃ for 2 h. When the Al2O3 content was increased to 30-50wt.%, complex solid reactions between La0.7Ca0.3CrO3 and Al2O3 occurred during the sintering process, and LaAl11O18 and CaCr2O4 phases were also formed besides the main LCCA crystalline phase. The addition of Al2O3 could 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.

关 键 词：陶瓷微滤膜 支撑体 La0.7Ca0.3Cr O3 AL2O3 电导率 

分 类 号：TQ174.75[化学工程—陶瓷工业]