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http://dx.doi.org/10.4191/kcers.2012.49.6.648

Improved Microstructural Homogeneity of Ni-BCY Cermets Membrane via High-Energy Milling  

Kim, Hyejin (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology)
Ahn, Kiyong (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology)
Kim, Boyoung (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology)
Lee, Jongheun (Department of Materials Science and Engineering, Korea University)
Chung, Yong-Chae (Department of Materials Science and Engineering, Hanyang University)
Kim, Hae-Ryoung (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology)
Lee, Jong-Ho (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.49, no.6, 2012 , pp. 648-653 More about this Journal
Abstract
Hybridization of dense ceramic membranes for hydrogen separation with an electronically conductive metallic phase is normally utilized to enhance the hydrogen permeation flux and thereby to increase the production efficiency of hydrogen. In this study, we developed a nickel and proton conducting oxide ($BaCe_{0.9}Y_{0.1}O_{3-{\delta}}$: BCY) based cermet (ceramic-metal composites) membrane. Focused on the general criteria in that the hydrogen permeation properties of a cermet membrane depend on its microstructural features, such as the grain size and the homogeneity of the mix, we tried to optimize the microstructure of Ni-BCY cermets by controlling the fabrication condition. The Ni-BCY composite powder was synthesized via a solid-state reaction using $2NiCO_3{\cdot}3Ni(OH)_2{\cdot}4H_2O$, $BaCeO_3$, $CeO_2$ and $Y_2O_3$ as a starting material. To optimize the mixing scale and homogeneity of the composite powder, we employed a high-energy milling process. With this high-energy milled composite powder, we could fabricate a fine-grained dense membrane with an excellent level of mixing homogeneity. This controlled Ni-BCY cermet membrane showed higher hydrogen permeability compared to uncontrolled Ni-BCY cermets created with a conventionally ball-milled composite powder.
Keywords
Ni-BCY; Cermets; Hydrogen permeation; Membrane;
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