烧结温度对La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)-Gd_(0.1)Ce_(0.9)O_(2-δ)双相复合透氧膜性能的影响

Effect of Sintering Temperature on Oxygen Permeable Performance of La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)-Gd_(0.1)Ce_(0.9)O_(2-δ) Dual-phase Membrane

采用干压成型制备La0.6Sr0.4Co0.2Fe0.8O3-δ-Gd0.1Ce0.9O2-δ(LSCF-GDC)双相复合透氧膜,通过X射线衍射、扫描电子显微镜以及透氧量测试等研究了不同烧结温度下材料相结构、微观形貌以及透氧性能。结果表明:LSCF和GDC两相化学相容性较好,在1 300℃条件下共烧后没有杂相生成;随着烧结温度的升高,LSCF-GDC的氧渗透量逐渐增加。在烧结温度为1 300℃、操作温度为900℃时,厚度0.67 mm的膜片氧渗透量为0.14 m L/(cm2·min);在烧结温度不高于1 300℃时,LSCF-GDC双相膜的氧渗透活化能随着烧结温度的升高而逐渐降低。

Dual phase membranes of La0.6Sr0.4Co0.2Fe0.8O3-δ-Gd0.1Ce0.9O2-δ(LSCF-GDC) were fabricated via dry-pressing. The phase structure, microstructure and oxygen permeation through dual-phase membranes sintered at different temperatures were analyzed by X-ray diffraction, scanning electron microscopy and oxygen permeation techniques, respectively. The results show that the two phases have a good structural compatibility, and there are no other phase and phase transfer when the sintering temperature increases. The oxygen permeability increases with the increase of sintering temperature. The oxygen permeability is 0.14 m L/(cm2·min) at 900 ℃. The activation energy for oxygen permeation through dual-phase membranes gradually decreases with the sintering temperature.