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
PublisherInstitute of Electrical and Electronic Engineers IEEE
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). Institute of Electrical and Electronic Engineers IEEE. 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. Institute of Electrical and Electronic Engineers IEEE, 2014. pp. 94-97
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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. Institute of Electrical and Electronic Engineers IEEE, 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. Institute of Electrical and Electronic Engineers IEEE, 2014. p. 94-97.

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

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AU - Metsäjoki, Jarkko

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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.

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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. Institute of Electrical and Electronic Engineers IEEE. 2014. p. 94-97 https://doi.org/10.1109/CEIDP.2014.6995894