Influence of humidity and temperature on the dielectric properties of thermally sprayed ceramic MgAl2O4 coatings

Minna Niittymäki, Kari Lahti, Tomi Suhonen, Ulla Kanerva, Jarkko Metsäjoki

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

    5 Citations (Scopus)

    Abstract

    Thermally sprayed ceramic coatings can be used as electrically insulating materials for example in high temperature applications (e.g. fuel cells) or in other demanding conditions where ceramic-based solutions are needed instead of e.g. polymers. The dielectric properties of thermally sprayed ceramic coatings are strongly affected by external conditions. The aim of this paper is to characterize the dielectric properties of thermally sprayed ceramic MgAl 2 O 4 coatings; especially the effects of ambient conditions on certain dielectric properties of thermally sprayed coatings are studied. DC resistivity at various electric field strengths as well as permittivity and losses at different frequencies is reported in the paper for MgAl 2 O 4 samples made by three different thermal spray techniques. These measurements were performed at three temperatures as well as at two different relative humidities. The DC breakdown strength was studied at one condition. Due to the slightly open porous microstructure of the studied coatings, increasing humidity particularly increases the dc conductivity and relative permittivity.
    Original languageEnglish
    Title of host publicationProceedings
    Subtitle of host publicationIEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014
    PublisherIEEE Institute of Electrical and Electronic Engineers
    Pages94-97
    ISBN (Electronic)978-1-4799-7525-9
    ISBN (Print)978-1-4799-7528-0
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA4 Article in a conference publication
    EventIEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014 - Des Moines, United States
    Duration: 19 Oct 201422 Oct 2014

    Conference

    ConferenceIEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014
    Abbreviated titleCEIDP 2014
    CountryUnited States
    CityDes Moines
    Period19/10/1422/10/14

    Keywords

    • ProperTune

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