Treeing phenomena in epoxy/alumina nanocomposite and interpretation by a multi-core model

Toshikatsu Tanaka, Akira Matsunawa, Yoshimichi Ohki, Masahiro Kozako, Masanori Kohtoh, Shigemitsu Okabe

    Research output: Contribution to journalArticle

    65 Citations (Scopus)

    Abstract

    Epoxy/alumina nanocomposites were prepared in laboratory to be shaped into specimens suitable for treeing experiments. It was elucidated that treeing breakdown strength would increase, if epoxy resins were nanostructured with nano-fillers such as nano boehmite alumina fillers with their loading from 5 to 10 wt%. Tree initiation time is prolonged, as the filler content increases. Tree morphology is different between base resin and its nanocomposite specimens. A new crossover phenomenon is recognized, i.e. thin channels extend more quickly to reach the opposite electrode in nanocomposites than in pure epoxy above ac 20 kV (1000 kV/mm in the tip of the needle), while they show slower growth in nanocomposites than in pure epoxy below ac 15 kV (750 kV/mm). It should be noted that the reach of such thin channels to the grounds does not mean breakdown, but such formed trees grow in width at later stage to cause final breakdown. Treeing phenomena obtained are analyzed and interpreted by a multi-core model to cover various findings of treeing phenomena in nanocomposites.

    Original languageEnglish
    Pages (from-to)1128-1135
    Number of pages8
    JournalIEEJ Transactions on Fundamentals and Materials
    Volume126
    Issue number11
    DOIs
    Publication statusPublished - 2006

    Fingerprint

    Nanocomposites
    Alumina
    Fillers
    Epoxy resins
    Needles
    Resins
    Electrodes
    Experiments

    Keywords

    • Multi-core model
    • Nanocomposite
    • Nanodielectrics
    • Polymer nanocomposite
    • Treeing
    • Treeing breakdown

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Treeing phenomena in epoxy/alumina nanocomposite and interpretation by a multi-core model. / Tanaka, Toshikatsu; Matsunawa, Akira; Ohki, Yoshimichi; Kozako, Masahiro; Kohtoh, Masanori; Okabe, Shigemitsu.

    In: IEEJ Transactions on Fundamentals and Materials, Vol. 126, No. 11, 2006, p. 1128-1135.

    Research output: Contribution to journalArticle

    Tanaka, Toshikatsu ; Matsunawa, Akira ; Ohki, Yoshimichi ; Kozako, Masahiro ; Kohtoh, Masanori ; Okabe, Shigemitsu. / Treeing phenomena in epoxy/alumina nanocomposite and interpretation by a multi-core model. In: IEEJ Transactions on Fundamentals and Materials. 2006 ; Vol. 126, No. 11. pp. 1128-1135.
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