Tensile stress evolution during the early-stage constrained sintering of Gadolinium-doped ceria films

Brian W. Sheldon, Jason D. Nicholas, Sunil Mandowara

    Research output: Contribution to journalArticle

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    Abstract

    In situ measurements during the constrained sintering of Gd-doped ceria reveal tensile stresses up to ∼250 MPa. These large tensile stresses are likely to contribute to the reduced densification (compared with freely sintered material) typically observed during constrained sintering. While existing models postulate that the tensile stress in a densifying constrained film cannot exceed the "sintering stress,"sigma;S, the observed tensile stresses are significantly larger than the estimated sigma;S for these materials. To explain this observation, we propose that the formation and extension of interparticle grain boundaries induce substantial tensile stresses in constrained films. A model of this phenomenon shows that converting excess surface energy to elastic strain energy can produce stresses that are comparable to the measured values. Further, if these "cohesive" stresses exceed sigma;S, grain-boundary diffusion should initially move material from the neck regions into the grain boundaries, not out of the grain boundaries as described by traditional sintering models.

    Original languageEnglish (US)
    Pages (from-to)209-216
    Number of pages8
    JournalJournal of the American Ceramic Society
    Volume94
    Issue number1
    DOIs
    StatePublished - Jan 2011

    Profile

    Tensile stress
    tensile stress
    Sintering
    Grain boundaries
    grain boundary
    Anthralin
    Addison Disease
    Traffic Accidents
    Arthroscopy
    Cyclic P-Oxides
    Cerium compounds
    Dibenzoxazepines
    Buccal Administration
    Feline Sarcoma Viruses
    Branched Chain Amino Acids
    Strain energy
    Gadolinium
    Densification
    Interfacial energy
    gadolinium

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

    Cite this

    Tensile stress evolution during the early-stage constrained sintering of Gadolinium-doped ceria films. / Sheldon, Brian W.; Nicholas, Jason D.; Mandowara, Sunil.

    In: Journal of the American Ceramic Society, Vol. 94, No. 1, 01.2011, p. 209-216.

    Research output: Contribution to journalArticle

    Sheldon, Brian W.; Nicholas, Jason D.; Mandowara, Sunil / Tensile stress evolution during the early-stage constrained sintering of Gadolinium-doped ceria films.

    In: Journal of the American Ceramic Society, Vol. 94, No. 1, 01.2011, p. 209-216.

    Research output: Contribution to journalArticle

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