介绍了对SrCo0.8Fe0.2O3-δ及SrCo0.8Fe0.1Sn0.1O3-δ两种透氧膜材料相组成、热学性能及氧渗透性能的研究, 发现实验中获得的SrCo0.8Fe0.2O3-δ透氧膜材料具有长期的相组成稳定性; 在它的B位进一步用Sn取代Fe，获得名义组成SrCo0.8Fe0.1Sn0.1O3-δ样品, 具有典型的双相组成特征. 与单相SrCo0.8Fe0.2O3-δ相比, 双相结构SrCo0.8Fe0.1Sn0.1O3-δ样品的热膨胀率降低, 抗热冲击性能增加显著; 同时, 氧渗透性能也有一定程度的提高, 如1.2mm厚的SrCo0.8Fe0.2O3-δ陶瓷膜样品在1000℃具有1.87×10-6mol cm-2 s-1的透氧率(PO2(h)=2.09×104Pa, PO2(l)=1.2×103Pa), 同样条件下的SrCo0.8Fe0.1Sn0.1O3-δ样品透氧率为2.49×10-6 mol cm-2 s-1.
The phase composition, thermal shocking resistance and the separating properties
of both SrCo0.8Fe0.2O3-δ(SCF) and SrCo0.8Fe0.1Sn0.1O3-δ (SSCF) membranes were investigated systematically. It was found the as
prepared SCF had long-term phase stability, and the SSCF had the composite feature with dual phase composition. As compared with the SCF, the SSCF had a more promoted thermal shocking resistance, which related to the decreasing of thermal expansion coefficient of it in comparison with the former. Furthermore, a permeation rate of 1.87×10-6 mol cm-2 s-1 was obtained on the as-prepared SCF membrane at 1000℃ and under oxygen partial pressure gradient of the PO2(h)/PO2(l)=0.209atm /0.012atm,
and at the same measuring condition, the permeability was 2.49×10-6 mol cm-2 s-1 for the as prepared SSCF one.
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