T-T-T behaviour of bioactive glasses 1-98 and 13-93

Susanne Fagerlund, Jonathan Massera, Mikko Hupa, Leena Hupa

    Research output: Contribution to journalArticleScientificpeer-review

    22 Citations (Scopus)

    Abstract

    In this work crystallization kinetics of bioactive glasses 1-98 and 13-93 are discussed. Within a certain temperature time window these glasses can be hot worked into various products without interfering with crystallization. The crystallization was studied isothermally by heating glass plates at different temperatures for different times. Phases in the samples were studied through XRD and SEM analyses. The nucleation-like curves and crystallization characteristics were measured with DTA. The temperature of maximum nucleation was measured for glass 1-98 at 725 degrees C and for 13-93 at 700 degrees C. The activation energy of crystallization of both glasses was 280 kJ/mol. The Johnson-Mehl-Avrami exponent and the SEM micrographs of the samples suggested surface crystallization. The primary crystalline phase was wollastonite. The growth rate of the crystallized surface layer was 1 order of magnitude higher in the plates of 1-98 than in 13-93. The results can be utilized to optimize the parameters in hot-working of the glasses.
    Original languageUndefined/Unknown
    Pages (from-to)2731–2738
    Number of pages8
    JournalJournal of the European Ceramic Society
    Volume32
    Issue number11
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Biomedical application
    • Glass
    • Hot-working
    • Thermal properties

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