摘要
用低温燃烧法合成了La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF)钙钛矿型复合氧化物电子一氧离子混合导体材料。采用微粉浆料相变纺丝技术制备了具有多孔层和致密层的管状中空非对称陶瓷膜。考察了温度以及吹扫气氦气流速对膜的透氧性能的影响。结果表明:当温度升高到700℃,氧通量显著增大;增加氦气流速也使透氧速率增大,但是当氦气流速增大到某一值时,透氧速率基本恒定。不同温度下达到最大透氧速率时的氦气流速不同。透过侧氧分压为1.7kPa、温度为900℃、平均厚度为0.45mm的LSCF管状中空膜的透氧速率达2.2×10-7mol/(cm2·s)。
A perovskite-type oxide ceramic material, La0.6Sr0.4Co0.2Fe0.8O3-δ （ LSCF）, which exhibits combined electronic and oxygen ionic conductivity, was synthesized by the low temperature combustion method. Using the prepared LSCF powders, a tube-shaped non-symmetrical ceramic membrane with porous and dense layers was prepared by a spinning technique based on phase inversion. The effect of temperature and helium flow rate on the oxygen permeability of the dense membrane tube was investigated. The experimental results indicate that the oxygen permeation flux increases remarkably when the temperature is increased to 700 ℃ or the helium flow rate is increased. When the helium flow rate is increased to a certain value, the oxygen permeation flux remains stable. The helium flow rate varies when the oxygen permeation flux reaches the maximum value at different temperatures. The oxygen permeation flux through an LSCF membrane tube （0.45 mm） at 900 ℃ is about 2. 2 × 10^-7 mol/（cm^2 · s） when the oxygen partial pressure inside the tube is 1.7 kPa.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2005年第8期934-938,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(20076025)资助项目
关键词
混合导体
钙钛矿
氧化物陶瓷膜
透氧膜
低温燃烧
相转变技术
mixed conductor
perovskite
oxide ceramic membrane
oxygen-permeable membrane
low temperature combustion
phase inversion technique
