An experimental method for characterizing crack propagation in dense silicon nitride

F.J.M. Schnitzeler, J. Göring, G. Ziegler

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

    Abstract

    In dense silicon nitride the effect of grain elongation on crack propagation was studied using scanning electron microscopy. The crack front proflle could be interpreted by both intergranular and transgranular crack deflection. This crack front deflection was characterized by means of a median deflection angle, which was computed from the surface trajectories of stable cracks. This method was applied to the evaluation of cracks in a set of hot-pressed silicon nitride materials, in which the grain elongation was varied in a controlled way by changing the additive concentration. It was found that the crack front deflection at the start of the critical crack propagation increased with grain elongation. At the same time, it was observed that room temperature fracture toughness increased with the median deflection angle. This indicates that crack front deflection contributes to the correlation between fracture toughness and grain elongation.
    Original languageEnglish
    Title of host publicationEuro-Ceramics II : [proceedings of the Second European Ceramic Society Conference (ECerS '91) held on 11 - 14 September 1991 in Augsburg, FRG]
    Place of PublicationKöln
    PublisherDKG
    Pages95-100
    Publication statusPublished - 1991
    Event2nd Conference and Exhibition of the European Ceramic Society (ECerS 1991), September 11-14, 1991, Augsburg, Germany - Augsburg, Germany
    Duration: 11 Sep 199114 Sep 1991

    Publication series

    NameFortschrittsberichte der Deutschen Keramischen Gesellschaft
    Volume6
    ISSN (Print)0177-6983

    Conference

    Conference2nd Conference and Exhibition of the European Ceramic Society (ECerS 1991), September 11-14, 1991, Augsburg, Germany
    Abbreviated titleECerS 1991
    CountryGermany
    CityAugsburg
    Period11/09/9114/09/91

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