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

研究成果: Article査読

74 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1128-1135
ページ数8
ジャーナルIEEJ Transactions on Fundamentals and Materials
126
11
DOI
出版ステータスPublished - 2006

ASJC Scopus subject areas

  • 電子工学および電気工学

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