【摘要】 采用机械化学激活与同步热激活相结合的固相反应法制备SrCoO2.5+δ(SC)透氧膜材料。借助热失重分析方法优化出反应物同步活化反应的温度条件:当以10℃/min升温到950℃进行固相反应时,参加反应的成份会同时被激化到活性状态,使合成SC产物的转化率提高,且所获得SC陶瓷膜样品的稳定性增加。氧渗透实验结果表明:氧空位无序的SC具有较高的透氧性能,随温度降低出现氧空位有序时,SC基本失去透氧性能;并且在升降温过程中,上述转变过程具有明显的回滞现象。更多还原

【Abstract】 The SrCoO3-δ (SC) oxygen-permeable membranes were fabricated by solid-state reaction method modified in joint effect of mechanically chemical and synchronization-thermal activations.The preparation conditions were optimized with the aid of thermo-gravimetric analysis.And it was found that the stable SC membrane could be obtained by controlling the solid-state-reaction temperature at 950 ℃ with the rapid heating rate of 10 ℃/min.In the reaction,the reacting materials contacted with each other were synchronization-thermally active,and further led to the improvement of conversion for the SC production.During oxygen permeation,the resulting SC membrane appears with high permeability in the state of oxygen vacancy disordered;otherwise,the permeability disappeared as oxygen vacancy ordered,and an apparent hysteresis of this conversion took place during different heating and cooling processes.更多还原