Nanotech 2011

Powder synthesis and aerosol deposition of the BaCe0.9Y0.1O2.95 and SrCe0.9Y0.1O2.95 phases for gas separation membrane

K.M. Kang, Y.H. Yun
Dongshin University, KR

Keywords: mixed-conducting oxide ceramics, ceramic membrane, gas separation, aerosol deposition, perovskite-based ceramic membrane

Abstract:

In this study, BaCe0.9Y0.1O2.95 and SrCe0.9Y0.1O2.95 powders were synthesized by a solid-state reaction method. Dense ceramic membranes of BaCe0.9Y0.1O2.95 and SrCe0.9Y0.1O2.95 system were fabricated by the aerosol deposition method, respectively. Mixed-conducting oxide powders of BaCe0.9Y0.1O2.95 (BCY) and SrCe0.9Y0.1O2.95 (SCY) phase synthesized through a solid-state reaction from the oxide precursors BaCO3, CeO2, SrCO3 and Y2O3. In mixing the starting materials, attrition milling was employed to form the oxide phases at a lower temperature. However, the oxide powders prepared after attrition milling showed large aggregates due to coarsening and necking of particles during heating process. The presence of secondary phases (SrCeO3 and CeO2), observed in XRD patterns indicates the incomplete solid-state reaction in the case of powder synthesis using attrition milling. The oxide powders fabricated by a single heating procedure after ball milling showed particles under approximately 500 nm and producing only the BaCe0.9Y0.1O2.95 and SrCe0.9Y0.1O2.95 phases in the XRD patterns. The oxide powders, prepared using ball milling were utilized to fabricate the ceramic membranes by the aerosol deposition method. The BaCe0.9Y0.1O2.95 and SrCe0.9Y0.1O2.95 membranes showed somewhat rough, dense morphologies and relatively small grain sizes of approximately 300 nm to 400 nm in the FE-SEM surface images. The SrCe0.9Y0.1O2.95 membrane showed uniform and excellent adhesion behavior with the substrate.
 

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