Oxygen semipermeable solid oxide membrane composites prepared by electrochemical vapor deposition

摘要: Ceramic membrane composites consisting of a coarse porous -alumina or two-layer alumina support and an oxygen semipermeable gas tight thin (0.2–5 μm) yttria stabilized zirconia (YSZ) film are prepared by the electrochemical vapor deposition (EVD) method. The minimum gas-tight thickness YSZ films depends strongly on average pore size which deposited EVD process. permeation fluxes through such composites, measured in situ apparatus, range 3 × 10−9 to 6 10−8 mol/cm2-sec with partial pressures P′O2 (high) ≈ 10−2 atm P″O2 (low) 10−5 atm, much larger than literature data for thicker pellets. During experiments rate-limiting step is found be bulk transport grown smaller 10 μm.