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采用并流共沉淀法合成了掺杂Cu的钙钛矿型混合导体透氧膜材料。考察了pH值、陈化时间等制备条件对前驱体性质和膜片透氧性能的影响,采用TG-DSC考察了复合氧化物粉体的生成过程,采用XRD、TEM对粉体的结构和形态进行了表征,对材料进行了透氧性能测试并与固相反应法作了比较。结果表明,pH=10~11,陈化时间为10小时是最佳的前驱体制备条件,合成温度为800℃即可得到纯相钙钛矿结构的粉体,其平均颗粒直径为90nm,透氧测试结果显示,制备方法和Cu掺杂量对膜片的透氧性能有显著影响,900℃时共沉淀法制备的SrFe0.6Ti0.1Cu0.3O3-δ的透氧量达到0.64ml.min-1.cm-2(STP)。
Cu-doped perovskite-type mixed-conductor oxygen-permeable membrane materials were synthesized by cocurrent coprecipitation method. The effects of preparation conditions such as pH and aging time on the properties of the precursor and the oxygen permeability of the membrane were investigated. The formation process of the composite oxide was investigated by TG-DSC. The structure and morphology of the composite were characterized by XRD and TEM. The characterization was carried out, the oxygen permeability of the material was tested and compared with the solid-phase reaction method. The results showed that the optimum conditions for the preparation of precursor were pH = 10-11 and aging time of 10 hours. The synthesis temperature was 800 ℃, the pure phase perovskite powder was obtained, the average particle diameter was 90nm, Oxygen test results show that the preparation method and the Cu doping amount have a significant impact on the oxygen permeability of the membrane. The oxygen permeability of SrFe0.6Ti0.1Cu0.3O3-δ prepared by co-precipitation at 900 ℃ reached 0.64ml · min- 1.cm-2 (STP).