Sintering of mixed-conducting composites for hydrogen membranes from nanoscale co-synthesized powders

N. L. Canfield, J. V. Crum, J. Matyas, A. Bandyopadhyay, K. S. Weil, L. R. Pederson, J. S. Hardy

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    The potential for highly selective, nongalvanic permeation of hydrogen through dense mixed conducting composites at elevated temperatures makes them attractive as hydrogen separation membranes. The glycine-nitrate combustion synthesis technique has been used to co-synthesize a cation-doped barium cerate protonic conducting phase together with a metallic nickel electronic conducting phase (15-35 vol% Ni). Co-synthesis of these phases results in an intimately mixed powder with particle sizes on the order of 10 nm. DTA/TGA of all as-synthesized compositions determined that a calcination temperature of 1000°C was required for full reaction of the cerate components. DTA/TGA and sintering shrinkage dilatometry were performed on calcined powders to determine that a sintering temperature of 1250°C would be adequate for achieving >90% relative density in all compositions. Bars of the material containing 25 vol% Ni were reduced at three different points in the heat treatment process (e.g., before, during, or after sintering). It was determined that there was less porosity in the sample reduced during sintering than any other. It was also seen on SEM that the primary grain size, regardless of when reduction occurred compared to sintering of the material, is less than 5 μm.

    Original languageEnglish
    Title of host publicationSupplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006
    PublisherTrans Tech Publications Ltd
    Pages1415-1420
    Number of pages6
    EditionPART 2
    ISBN (Print)0878494286, 9780878494286
    DOIs
    Publication statusPublished - 1 Jan 2007
    Event5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006 - Vancouver, Canada
    Duration: 4 Jul 20068 Jul 2006

    Publication series

    NameMaterials Science Forum
    NumberPART 2
    Volume539-543
    ISSN (Print)0255-5476
    ISSN (Electronic)1662-9752

    Other

    Other5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
    CountryCanada
    CityVancouver
    Period4/7/068/7/06

    Keywords

    • Hydrogen separation
    • Mixed conducting composite

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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  • Cite this

    Canfield, N. L., Crum, J. V., Matyas, J., Bandyopadhyay, A., Weil, K. S., Pederson, L. R., & Hardy, J. S. (2007). Sintering of mixed-conducting composites for hydrogen membranes from nanoscale co-synthesized powders. In Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006 (PART 2 ed., pp. 1415-1420). (Materials Science Forum; Vol. 539-543, No. PART 2). Trans Tech Publications Ltd. https://doi.org/10.4028/0-87849-428-6.1415