Detection of electrochemical migration grown in a two-layered dielectric by the pulsed electroacoustic method and numerical analysis of the signals

Hiroki Asakawa, Masashi Natsui, Toshikatsu Tanaka, Yoshimichi Ohki, Takashi Maeno, Kenji Okamoto

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Electrochemical migration growth along the thickness direction in a two-layered dielectric, consisting of an Al cathode, paper/phenol-resin composite, epoxy resin, and a Cu anode that simulates a laminated structure of a printed wiring board, was detected by the pulsed electroacoustic (PEA) method. The PEA signals obtained were analyzed using a numerical model on the generation and propagation of acoustic waves. Accumulation of positive charge appears in front of the Cu anode of the sample, in which the growth of electrochemical migration was observed by SEM-EDS. At the same time, the signal due to negative charge at the interface between the resin and the composite decreases significantly. This is ascribable to the progress of electrochemical migration in the thickness direction. The numerical analysis done by assuming that the conductivity of the epoxy resin layer near the anode was increased gives a good agreement with the PEA spectra. As for the charge on the anode, the PEA signal appears at the correct position when the anode material is semi-conductive polymer, while it appears as if the anode were inside the real anode when the material is Cu. In order to solve this puzzle, numerical calculations were carried out by the finite difference method. As a result, it has become clear that the discontinuity in the acoustic impedance between the epoxy resin and Cu electrode is responsible.

    Original languageEnglish
    Pages (from-to)771-777
    Number of pages7
    JournalIEEJ Transactions on Fundamentals and Materials
    Volume131
    Issue number9
    DOIs
    Publication statusPublished - 2011

    Fingerprint

    Numerical analysis
    Anodes
    Epoxy resins
    Resins
    Acoustic impedance
    Composite materials
    Finite difference method
    Printed circuit boards
    Phenols
    Numerical models
    Energy dispersive spectroscopy
    Cathodes
    Acoustic waves
    Scanning electron microscopy
    Electrodes
    Polymers

    Keywords

    • Electrochemical migration
    • Epoxy resin
    • Paper/phenol-resin composite
    • Printed wiring board
    • Pulsed electroacoustic method
    • Space charge

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Detection of electrochemical migration grown in a two-layered dielectric by the pulsed electroacoustic method and numerical analysis of the signals. / Asakawa, Hiroki; Natsui, Masashi; Tanaka, Toshikatsu; Ohki, Yoshimichi; Maeno, Takashi; Okamoto, Kenji.

    In: IEEJ Transactions on Fundamentals and Materials, Vol. 131, No. 9, 2011, p. 771-777.

    Research output: Contribution to journalArticle

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    abstract = "Electrochemical migration growth along the thickness direction in a two-layered dielectric, consisting of an Al cathode, paper/phenol-resin composite, epoxy resin, and a Cu anode that simulates a laminated structure of a printed wiring board, was detected by the pulsed electroacoustic (PEA) method. The PEA signals obtained were analyzed using a numerical model on the generation and propagation of acoustic waves. Accumulation of positive charge appears in front of the Cu anode of the sample, in which the growth of electrochemical migration was observed by SEM-EDS. At the same time, the signal due to negative charge at the interface between the resin and the composite decreases significantly. This is ascribable to the progress of electrochemical migration in the thickness direction. The numerical analysis done by assuming that the conductivity of the epoxy resin layer near the anode was increased gives a good agreement with the PEA spectra. As for the charge on the anode, the PEA signal appears at the correct position when the anode material is semi-conductive polymer, while it appears as if the anode were inside the real anode when the material is Cu. In order to solve this puzzle, numerical calculations were carried out by the finite difference method. As a result, it has become clear that the discontinuity in the acoustic impedance between the epoxy resin and Cu electrode is responsible.",
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    AU - Maeno, Takashi

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