【作者】 樊传刚； 黄显怀； 檀杰； 李栋才； 刘卫； 陈初升；

【Author】 FAN Chuan-gang, HUANG Xian-huai, TAN Jie, LI Dong-cai, LIU Wei, CHEN Chu-sheng(Department of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China;School of Material Engineering, Anhui University of Technology, Maanshan 243002, China)

【机构】 中国科学技术大学材料科学与工程系； 安徽工业大学材料工程学院；

【摘要】 介绍了通过固相反应制备SrCo0.8Fe0.2O3-δ(SCF)陶瓷膜的研究,研究发现当选择合成SCF的固相反应温度在950℃以上,参加反应的将主要是一些活性物质,从而使所合成产品中SCF的转化率提高,这样合成的陶瓷膜样品的化学稳定性提高,它可以长期暴露在空气中而不发生变化,在氧分压梯度下的相组成也较为稳定;当在样品上施加2.1×104Pa/1.2×103pa氧分压梯度时,1.24mm厚的SCF样品在1000℃的氧渗透率为1.87×10-6mol·cm-2·s-1,并在819℃上下出现表现氧渗透活化能的变化,这表明在该温度有氧空位的有序无序相变发生。更多还原

【Abstract】 The SrCo0.8Fe0.2O3-δ(SCF) oxygen-permeable membranes were fabricated by solid-state reaction method. The preparation condition and stability of the as-prepared samples were conducted by the thermogravimetric analysis and XRD method, alternatively. It was found that the stable SCF membrane can be obtained by controlling the solid-state-reaction temperature at 950℃. In the reaction, the reacting materials contacted with the each other were high active, that could lead to the improvement of conversion of the SCF production, so resulted in the stability of as prepared samples, which had kept phase composition as unchangeable as fresh ones after long term exposed in the atmosphere and experimented by oxygen permeation. For a 1.24mm thick membrane, the permeation flux was 1.87×10-6 mol cm-2 at 1000℃ under the oxygen partial pressure gradient of 2.1×104Pa (air) /1.2×103Pa (helium). The difference between apparent activation energies upon and below 819℃, showed the appearance of transition, which was the disordered to ordered of oxygen vacancy.更多还原