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

Abstract

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
Pages131-135
ISBN (Print)978-8-2321-0274-7
Publication statusPublished - 2013
MoE publication typeNot Eligible
EventThe 23rd Nordic Insulation Symposium, NORD-IS 13 - Trondheim, Norway
Duration: 9 Jun 201312 Jun 2013

Conference

ConferenceThe 23rd Nordic Insulation Symposium, NORD-IS 13
Abbreviated titleNORD-IS 2013
CountryNorway
CityTrondheim
Period9/06/1312/06/13

Fingerprint

Ceramic coatings
Sprayed coatings
Dielectric properties
Coatings
Atmospheric humidity
Thermal spraying
Oxygen
Insulating materials
Magnesia
Electric breakdown
Magnesium
Insulation
Fuel cells
Permittivity
Alumina
Aluminum
Temperature
Oxides
Chemical analysis

Cite this

Niittymäki, M., Rotthier, B., Suhonen, T., Metsäjoki, J., & Lahti, K. (2013). Effects of ambient conditions on the dielectric properties of thermally sprayed ceramic coating. In L. Postmyr (Ed.), Proceedings of the 23rd Nordic Insulation Symposium: NORD-IS 2013 (pp. 131-135). Akademika forlag.
Niittymäki, M. ; Rotthier, B. ; Suhonen, Tomi ; Metsäjoki, Jarkko ; Lahti, K. / Effects of ambient conditions on the dielectric properties of thermally sprayed ceramic coating. Proceedings of the 23rd Nordic Insulation Symposium: NORD-IS 2013. editor / Lasse Postmyr. Akademika forlag, 2013. pp. 131-135
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title = "Effects of ambient conditions on the dielectric properties of thermally sprayed ceramic coating",
abstract = "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.",
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Niittymäki, M, Rotthier, B, Suhonen, T, Metsäjoki, J & Lahti, K 2013, Effects of ambient conditions on the dielectric properties of thermally sprayed ceramic coating. in L Postmyr (ed.), Proceedings of the 23rd Nordic Insulation Symposium: NORD-IS 2013. Akademika forlag, pp. 131-135, The 23rd Nordic Insulation Symposium, NORD-IS 13, Trondheim, Norway, 9/06/13.

Effects of ambient conditions on the dielectric properties of thermally sprayed ceramic coating. / Niittymäki, M.; Rotthier, B.; Suhonen, Tomi; Metsäjoki, Jarkko; Lahti, K.

Proceedings of the 23rd Nordic Insulation Symposium: NORD-IS 2013. ed. / Lasse Postmyr. Akademika forlag, 2013. p. 131-135.

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

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T1 - Effects of ambient conditions on the dielectric properties of thermally sprayed ceramic coating

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AU - Rotthier, B.

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AU - Metsäjoki, Jarkko

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AB - 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.

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Niittymäki M, Rotthier B, Suhonen T, Metsäjoki J, Lahti K. Effects of ambient conditions on the dielectric properties of thermally sprayed ceramic coating. In Postmyr L, editor, Proceedings of the 23rd Nordic Insulation Symposium: NORD-IS 2013. Akademika forlag. 2013. p. 131-135