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

    4 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

    Fingerprint

    ceramic coatings
    sprayed coatings
    humidity
    dielectric properties
    direct current
    ceramics
    permittivity
    coatings
    temperature
    electric field strength
    insulation
    fuel cells
    sprayers
    breakdown
    conductivity
    microstructure
    electrical resistivity
    polymers

    Keywords

    • ProperTune

    Cite this

    Niittymäki, M., Lahti, K., Suhonen, T., Kanerva, U., & Metsäjoki, J. (2014). Influence of humidity and temperature on the dielectric properties of thermally sprayed ceramic MgAl2O4 coatings. In Proceedings: IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014 (pp. 94-97). IEEE Institute of Electrical and Electronic Engineers . https://doi.org/10.1109/CEIDP.2014.6995894
    Niittymäki, Minna ; Lahti, Kari ; Suhonen, Tomi ; Kanerva, Ulla ; Metsäjoki, Jarkko. / Influence of humidity and temperature on the dielectric properties of thermally sprayed ceramic MgAl2O4 coatings. Proceedings: IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014. IEEE Institute of Electrical and Electronic Engineers , 2014. pp. 94-97
    @inproceedings{b364820268cd43b9b7fa58d8e62eb103,
    title = "Influence of humidity and temperature on the dielectric properties of thermally sprayed ceramic MgAl2O4 coatings",
    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.",
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    author = "Minna Niittym{\"a}ki and Kari Lahti and Tomi Suhonen and Ulla Kanerva and Jarkko Mets{\"a}joki",
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    language = "English",
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    Niittymäki, M, Lahti, K, Suhonen, T, Kanerva, U & Metsäjoki, J 2014, Influence of humidity and temperature on the dielectric properties of thermally sprayed ceramic MgAl2O4 coatings. in Proceedings: IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014. IEEE Institute of Electrical and Electronic Engineers , pp. 94-97, IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014, Des Moines, United States, 19/10/14. https://doi.org/10.1109/CEIDP.2014.6995894

    Influence of humidity and temperature on the dielectric properties of thermally sprayed ceramic MgAl2O4 coatings. / Niittymäki, Minna; Lahti, Kari; Suhonen, Tomi; Kanerva, Ulla; Metsäjoki, Jarkko.

    Proceedings: IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014. IEEE Institute of Electrical and Electronic Engineers , 2014. p. 94-97.

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

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    T1 - Influence of humidity and temperature on the dielectric properties of thermally sprayed ceramic MgAl2O4 coatings

    AU - Niittymäki, Minna

    AU - Lahti, Kari

    AU - Suhonen, Tomi

    AU - Kanerva, Ulla

    AU - Metsäjoki, Jarkko

    PY - 2014

    Y1 - 2014

    N2 - 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.

    AB - 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.

    KW - ProperTune

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    M3 - Conference article in proceedings

    SN - 978-1-4799-7528-0

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    BT - Proceedings

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    Niittymäki M, Lahti K, Suhonen T, Kanerva U, Metsäjoki J. Influence of humidity and temperature on the dielectric properties of thermally sprayed ceramic MgAl2O4 coatings. In Proceedings: IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014. IEEE Institute of Electrical and Electronic Engineers . 2014. p. 94-97 https://doi.org/10.1109/CEIDP.2014.6995894