Effect of sealant materials on oxygen permeation in perovskite oxide membrane

Ba_0.5Sr_0.5Co_0.8Fe_0.2O _3.δ oxide was synthesized by polymerized complex method. Dense membrane of perovskite oxide was prepared using as-prepared powder by pressing and sintering at 1080 °C. Leakage test was conducted on the membrane sealed by gold ring, Pyrex, ring or Pyrex powder as a sealing material. The oxygen, permeation flux of Ba_0.5Sr_0.5Co_0.8Fe _0.2O_3.δ membrane increased with increasing temperature and was 0.74 mL/min ·cm² at 900 °C. In the case of the membrane applied by sealing material, oxygen permeation flux of the membrane using gold ring at 950 °C was higher than that using Pyrex materials because the undesired spreading of Pyrex glass materials in the membrane led to the reduction of effective permeation area. Microphotograph analysis results for the membrane after permeation test confirmedthe diffusion of Pyrex glass seal, into the membrane.