Effects of ambient conditions on the dielectric properties of thermally sprayed ceramic coating

M. Niittymäki, B. Rotthier, Tomi Suhonen, Jarkko Metsäjoki, K. Lahti

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    Thermal spraying techniques are used to manufacture insulating coatings especially for demanding applications like fuel cells where normal insulating materials cannot be used. In electrical insulation applications, the mostly used coating materials are aluminum oxide (Al2O3), magnesium oxide (MgO) and magnesium aluminate (MgAl2O4). Dielectric properties of thermally sprayed ceramic coatings are strongly affected by ambient conditions, and in addition to this they are not well documented in the literature. In this paper the effects of environmental conditions on certain dielectric properties of a thermally sprayed coating are studied. DC resistivity as well as permittivity and losses at different frequencies at relative humidities of 20 % and 45 % at temperature of 20 °C, 40 °C and 60 °C will be reported in the paper for Al2O3 samples sprayed using HVOF (High Velocity Oxygen Fuel) technique. DC dielectric breakdown strength is also studied for the HVOF alumina coating at temperature of 20 °C and relative humidity of 20 %. Effects of ambient conditions and coating material composition are also analyzed.
    Original languageEnglish
    Title of host publicationProceedings of the 23rd Nordic Insulation Symposium
    Subtitle of host publicationNORD-IS 2013
    EditorsLasse Postmyr
    PublisherAkademika forlag
    ISBN (Print)978-8-2321-0274-7
    Publication statusPublished - 2013
    MoE publication typeA4 Article in a conference publication
    EventThe 23rd Nordic Insulation Symposium, NORD-IS 13 - Trondheim, Norway
    Duration: 9 Jun 201312 Jun 2013


    ConferenceThe 23rd Nordic Insulation Symposium, NORD-IS 13
    Abbreviated titleNORD-IS 2013


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