Effect of microstructure on fracture toughness of alumina ceramics for IC plate

Toshimitsu Yokobori, Takeshi Adachi, Takeo Yokobori

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

    1 Citation (Scopus)

    Abstract

    Experimental and analytical studies on fracture toughness of alumina ceramics used as IC plate were carried out. Material used was 96% alumina ceramics. Four point bending test method was adopted to estimate fracture toughness. Notches were introduced for various length ranging from 0.02mm to 0.2mm. Following results and conclusions were obtained. The fracture toughness obtained by conventional fracture mechanics approach is apparent one and increases with an increase of precrack length and shows a constant value in the range of larger crack length. This characteristics was explained by the interaction between a main precrack and inherent microcracks or voids near in the crack tip. When main crack length becomes shorter, the interaction between main crack and voids or microcracks are not negligible. So continuum mechanics can not be applied and it should be treated as porous materials. But when crack length becomes longer to some specified value, these effect becomes less evident. For such case, macroscopic fracture mechanics can be applied to the estimation of fracture strength. Physical considerations based on micro mechanics was carried out to understand these phenomenon mentioned above. These results will be useful when a notch is introduced in an alumina green sheet in order to break down an IC substrate after sintered with the dimension designed.

    Original languageEnglish
    Title of host publicationAmerican Society of Mechanical Engineers, EEP
    PublisherPubl by ASME
    Pages739-743
    Number of pages5
    ISBN (Print)0791807665
    Publication statusPublished - 1992 Dec 1
    EventProceedings of the 1992 Joint ASME/JSME Conference on Electronic Packaging. Part 2 (of 2) - Milpitas, CA, USA
    Duration: 1992 Apr 91992 Apr 12

    Publication series

    NameAmerican Society of Mechanical Engineers, EEP
    Volume2

    Other

    OtherProceedings of the 1992 Joint ASME/JSME Conference on Electronic Packaging. Part 2 (of 2)
    CityMilpitas, CA, USA
    Period92/4/992/4/12

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Mechanical Engineering

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