Effects of nano-filler addition on partial discharge resistance and dielectric breakdown strength of Micro-Al2O3/epoxy composite

Zhe Li, Kenji Okamoto, Yoshimichi Ohki, Toshikatsu Tanaka

    Research output: Contribution to journalArticle

    105 Citations (Scopus)

    Abstract

    It is often observed that the insulation structure for an insulated gate bipolar transistor (IGBT) suffers from dielectric failure, when the insulation is made of epoxy resin to which micro fillers with a high thermal conductivity were added. In order to reveal the above phenomena and to clarify the breakdown (BD) mechanism, we have carried out experiments using an MB-PWB (metal-base printed wiring board) insulation simulated structure. As a result, it was clarified that the IGBT insulation breaks down after successive partial discharges (PDs). It was also elucidated that BD strength becomes lower, when epoxy resin was loaded with high content of micro-fillers. A trial was made to raise the once-lowered BD strength by adding nano-Al2O3 fillers. Three kinds of experiments were carried out, i.e. an MB-PWB insulation simulated structure for dielectric failure, a rod-to-plane electrode for PD erosion resistance, and a sphere-tosphere electrode for BD strength for four kinds of insulation samples, i.e. neat epoxy, 5-wt% nano-Al2O 3/epoxy composite, 60-wt% micro-Al2O3/epoxy composite, and combined 2-wt% nano- and 60-wt% micro-Al2O 3/epoxy composite. It was clarified that the nano-micro-composite is higher in both BD strength and PD resistance than the micro-composite. It should be noted that the addition of nano-fillers would provide an excellent approach that can increase the dielectric BD strength and time of micro-filled epoxy composites.

    Original languageEnglish
    Article number5492235
    Pages (from-to)653-661
    Number of pages9
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Volume17
    Issue number3
    DOIs
    Publication statusPublished - 2010 Jun

    Fingerprint

    Partial discharges
    Electric breakdown
    Fillers
    Insulation
    Composite materials
    Insulated gate bipolar transistors (IGBT)
    Epoxy resins
    Printed circuit boards
    Electrodes
    Metals
    Erosion
    Thermal conductivity
    Experiments

    Keywords

    • Breakdown strength
    • Epoxy
    • Erosion
    • Nano-AlO
    • Nano-composite
    • Nano-micro-composite
    • PD resistance
    • Surface discharge

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Effects of nano-filler addition on partial discharge resistance and dielectric breakdown strength of Micro-Al2O3/epoxy composite. / Li, Zhe; Okamoto, Kenji; Ohki, Yoshimichi; Tanaka, Toshikatsu.

    In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 17, No. 3, 5492235, 06.2010, p. 653-661.

    Research output: Contribution to journalArticle

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