Evaluation of dilatometric techniques for studies of sintering kinetics

M. El Sayed Ali, Ole Toft Sørensen

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    Abstract

    The kinetics of the initial sintering stage of CeO2 is evaluated by three different technique:: constant heating rate dilatometry, constant shrinkage rate dilatometry and a new technique recently introduced by the authors called Stepwise Isothermal Dilatometry (SID).

    Comparative measurements with these techniques showed that too high activation energies were obtained with the two first techniques, both of which can be termed as nonisothermal, whereas activation enegies comparable to those reported for cation diffusion in other fluorite oxides were obtained with the latter technique. Of the three techniques SID is thus considered to be the most accurate for studies of the sintering kinetics. In contrast to the two nonisothermal techniques SID has the further advantage that both the controlling mechanism and its activation energy can be determined in a single experiment. Prom the SID-measurement it was concluded that the initial sintering stage of CeO2 is controlled by grain-boundary diffusion.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherRisø National Laboratory
    Number of pages15
    ISBN (Print)87-550-1102-0
    Publication statusPublished - 1985
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number521
    ISSN0106-2840

    Keywords

    • Risø-R-521
    • Risø-R-521(EN)
    • Avtivation energy
    • Cerium oxides
    • Comparative evaluations
    • Diffusion
    • Dilatometry
    • Isothermal processes
    • Kinetics
    • Measuring methods
    • Shrinkage
    • Sintering

    Cite this

    El Sayed Ali, M., & Sørensen, O. T. (1985). Evaluation of dilatometric techniques for studies of sintering kinetics. Risø National Laboratory. Denmark. Forskningscenter Risoe. Risoe-R, No. 521