Dielectric breakdown strength of thermally sprayed ceramic coatings: Effects of different test arrangements

M. Niittymäki (Corresponding Author), K. Lahti, Tomi Suhonen, Jarkko Metsäjoki

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

Dielectric properties (e.g., DC resistivity and dielectric breakdown strength) of insulating thermally sprayed ceramic coatings differ depending on the form of electrical stress, ambient conditions, and aging of the coating, however, the test arrangements may also have a remarkable effect on the properties. In this paper, the breakdown strength of high velocity oxygen fuel-sprayed alumina coating was studied using six different test arrangements at room conditions in order to study the effects of different test and electrode arrangements on the breakdown behavior. In general, it was shown that test arrangements have a considerable influence on the results. Based on the results, the recommended testing method is to use embedded electrodes between the voltage electrode and the coating at least in DC tests to ensure a good contact with the surface. With and without embedded electrodes, the DBS was 31.7 and 41.8 V/µm, respectively. Under AC excitation, a rather good contact with the sample surface is, anyhow, in most cases acquired by a rather high partial discharge activity and no embedded electrodes are necessarily needed (DBS 29.2 V/µm). However, immersion of the sample in oil should strongly be avoided because the oil penetrates quickly into the coating affecting the DBS (81.2 V/µm).
Original languageEnglish
Pages (from-to)542-551
JournalJournal of Thermal Spray Technology
Volume24
Issue number3
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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ceramic coatings
sprayed coatings
Ceramic coatings
Sprayed coatings
Electric breakdown
breakdown
direct broadcast satellites
Electrodes
Coatings
electrodes
coatings
Oils
oils
direct current
Aluminum Oxide
Partial discharges
Dielectric properties
Alumina
submerging
Aging of materials

Keywords

  • Al2O3
  • breakdown strength
  • coating
  • dielectric
  • HVOF
  • thermal spraying
  • ProperPart
  • ProperTune

Cite this

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title = "Dielectric breakdown strength of thermally sprayed ceramic coatings: Effects of different test arrangements",
abstract = "Dielectric properties (e.g., DC resistivity and dielectric breakdown strength) of insulating thermally sprayed ceramic coatings differ depending on the form of electrical stress, ambient conditions, and aging of the coating, however, the test arrangements may also have a remarkable effect on the properties. In this paper, the breakdown strength of high velocity oxygen fuel-sprayed alumina coating was studied using six different test arrangements at room conditions in order to study the effects of different test and electrode arrangements on the breakdown behavior. In general, it was shown that test arrangements have a considerable influence on the results. Based on the results, the recommended testing method is to use embedded electrodes between the voltage electrode and the coating at least in DC tests to ensure a good contact with the surface. With and without embedded electrodes, the DBS was 31.7 and 41.8 V/µm, respectively. Under AC excitation, a rather good contact with the sample surface is, anyhow, in most cases acquired by a rather high partial discharge activity and no embedded electrodes are necessarily needed (DBS 29.2 V/µm). However, immersion of the sample in oil should strongly be avoided because the oil penetrates quickly into the coating affecting the DBS (81.2 V/µm).",
keywords = "Al2O3, breakdown strength, coating, dielectric, HVOF, thermal spraying, ProperPart, ProperTune",
author = "M. Niittym{\"a}ki and K. Lahti and Tomi Suhonen and Jarkko Mets{\"a}joki",
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journal = "Journal of Thermal Spray Technology",
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Dielectric breakdown strength of thermally sprayed ceramic coatings : Effects of different test arrangements. / Niittymäki, M. (Corresponding Author); Lahti, K.; Suhonen, Tomi; Metsäjoki, Jarkko.

In: Journal of Thermal Spray Technology, Vol. 24, No. 3, 2015, p. 542-551.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Dielectric breakdown strength of thermally sprayed ceramic coatings

T2 - Effects of different test arrangements

AU - Niittymäki, M.

AU - Lahti, K.

AU - Suhonen, Tomi

AU - Metsäjoki, Jarkko

PY - 2015

Y1 - 2015

N2 - Dielectric properties (e.g., DC resistivity and dielectric breakdown strength) of insulating thermally sprayed ceramic coatings differ depending on the form of electrical stress, ambient conditions, and aging of the coating, however, the test arrangements may also have a remarkable effect on the properties. In this paper, the breakdown strength of high velocity oxygen fuel-sprayed alumina coating was studied using six different test arrangements at room conditions in order to study the effects of different test and electrode arrangements on the breakdown behavior. In general, it was shown that test arrangements have a considerable influence on the results. Based on the results, the recommended testing method is to use embedded electrodes between the voltage electrode and the coating at least in DC tests to ensure a good contact with the surface. With and without embedded electrodes, the DBS was 31.7 and 41.8 V/µm, respectively. Under AC excitation, a rather good contact with the sample surface is, anyhow, in most cases acquired by a rather high partial discharge activity and no embedded electrodes are necessarily needed (DBS 29.2 V/µm). However, immersion of the sample in oil should strongly be avoided because the oil penetrates quickly into the coating affecting the DBS (81.2 V/µm).

AB - Dielectric properties (e.g., DC resistivity and dielectric breakdown strength) of insulating thermally sprayed ceramic coatings differ depending on the form of electrical stress, ambient conditions, and aging of the coating, however, the test arrangements may also have a remarkable effect on the properties. In this paper, the breakdown strength of high velocity oxygen fuel-sprayed alumina coating was studied using six different test arrangements at room conditions in order to study the effects of different test and electrode arrangements on the breakdown behavior. In general, it was shown that test arrangements have a considerable influence on the results. Based on the results, the recommended testing method is to use embedded electrodes between the voltage electrode and the coating at least in DC tests to ensure a good contact with the surface. With and without embedded electrodes, the DBS was 31.7 and 41.8 V/µm, respectively. Under AC excitation, a rather good contact with the sample surface is, anyhow, in most cases acquired by a rather high partial discharge activity and no embedded electrodes are necessarily needed (DBS 29.2 V/µm). However, immersion of the sample in oil should strongly be avoided because the oil penetrates quickly into the coating affecting the DBS (81.2 V/µm).

KW - Al2O3

KW - breakdown strength

KW - coating

KW - dielectric

KW - HVOF

KW - thermal spraying

KW - ProperPart

KW - ProperTune

U2 - 10.1007/s11666-014-0211-1

DO - 10.1007/s11666-014-0211-1

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