Effect of water absorption temperature on space charge profiles in paper/phenol-resin composites for printed circuit boards

Yasutsune Echigo, Masashi Natsui, Takashi Maeno, Yoshimichi Ohki

    Research output: Contribution to journalArticle

    Abstract

    More and more electronics are intended for use in adverse environments at high temperatures with high humidity. The spatial distributions of internal charge carriers, mainly due to ionic impurities that appear in hot and humid environments, are considered to affect the reliability of bulk insulation. Therefore, the authors examined space charge behavior inside paper/phenol-resin composites for printed circuit boards under DC voltages, focusing on the effect of the water absorption temperature. Both the sample weight and thickness were increased monotonically by immersion in water with an increase in the water temperature from 24 °C to 85 °C, indicating that the water absorption by the sample was temperature dependent. In the early periods of water absorption (up to 10 hours), the electric field decreased near the two electrodes and increased in the other regions. Furthermore, heterocharge formation was observed near the cathode as the water absorption progressed, becoming more significant at higher water temperatures. Ion chromatography analyses detected numerous ions such as Na+, NH+ 4, and Cl- from the water, in which the sample had been immersed for 100 hours at various temperatures. It is highly possible that these ions are responsible for the heterocharge formation.

    Original languageEnglish
    Pages (from-to)1-7
    Number of pages7
    JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
    Volume173
    Issue number2
    DOIs
    Publication statusPublished - 2010 Nov 15

    Fingerprint

    Water absorption
    Electric space charge
    Printed circuit boards
    Phenols
    Resins
    Composite materials
    Temperature
    Water
    Ion chromatography
    Ions
    Charge carriers
    Spatial distribution
    Insulation
    Atmospheric humidity
    Cathodes
    Electronic equipment
    Electric fields
    Impurities
    Electrodes
    Electric potential

    Keywords

    • Paper/phenol-resin composite
    • Printed circuit board
    • Pulsed electroacoustic method
    • Space charge

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Energy Engineering and Power Technology

    Cite this

    Effect of water absorption temperature on space charge profiles in paper/phenol-resin composites for printed circuit boards. / Echigo, Yasutsune; Natsui, Masashi; Maeno, Takashi; Ohki, Yoshimichi.

    In: Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi), Vol. 173, No. 2, 15.11.2010, p. 1-7.

    Research output: Contribution to journalArticle

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