Abstract
| Original language | English |
|---|---|
| Article number | 7873508 |
| Pages (from-to) | 499 - 510 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Dielectrics and Electrical Insulation |
| Volume | 24 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2017 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- spinel
- dielectric breakdown
- conductivity
- thermally sprayed ceramic coating
- alumina
- ProperTune
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DC conduction and breakdown behavior of thermally sprayed ceramic coatings. / Niittymäki, Minna; Lahti, Kari; Suhonen, Tomi; Metsäjoki, Jarkko.
In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 24, No. 1, 7873508, 2017, p. 499 - 510.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - DC conduction and breakdown behavior of thermally sprayed ceramic coatings
AU - Niittymäki, Minna
AU - Lahti, Kari
AU - Suhonen, Tomi
AU - Metsäjoki, Jarkko
PY - 2017
Y1 - 2017
N2 - In this study, the DC conductivity from low electric fields up to breakdown fields is studied for several different thermally sprayed ceramic coatings. Although the DC conductivity of bulk alumina ceramic has been observed to follow the space charge limited current conduction mechanism, the studied ceramic coatings do not follow or follow only partly this mechanism. Possible reason for this is their different microstructure since bulk alumina exhibits fully crystalline microstructure while the ceramic coating consists of crystalline and amorphous regions as well as voids, defects and numerous interfaces. A possible conduction mechanism of the ceramic coatings based on the different conductivities of the amorphous and crystalline regions of the coatings is proposed. The microstructural features (e.g. volumetric porosity) are found to affect the breakdown strength for some of the studied coatings. The step-test breakdown strengths of the coatings were lower than the ramp-test ones due to the longer stress durations in step tests giving an indication of effects of electrical stress duration and possible short-term degradation of the coatings.
AB - In this study, the DC conductivity from low electric fields up to breakdown fields is studied for several different thermally sprayed ceramic coatings. Although the DC conductivity of bulk alumina ceramic has been observed to follow the space charge limited current conduction mechanism, the studied ceramic coatings do not follow or follow only partly this mechanism. Possible reason for this is their different microstructure since bulk alumina exhibits fully crystalline microstructure while the ceramic coating consists of crystalline and amorphous regions as well as voids, defects and numerous interfaces. A possible conduction mechanism of the ceramic coatings based on the different conductivities of the amorphous and crystalline regions of the coatings is proposed. The microstructural features (e.g. volumetric porosity) are found to affect the breakdown strength for some of the studied coatings. The step-test breakdown strengths of the coatings were lower than the ramp-test ones due to the longer stress durations in step tests giving an indication of effects of electrical stress duration and possible short-term degradation of the coatings.
KW - spinel
KW - dielectric breakdown
KW - conductivity
KW - thermally sprayed ceramic coating
KW - alumina
KW - ProperTune
UR - http://www.scopus.com/inward/record.url?scp=85015789735&partnerID=8YFLogxK
U2 - 10.1109/TDEI.2016.006156
DO - 10.1109/TDEI.2016.006156
M3 - Article
VL - 24
SP - 499
EP - 510
JO - IEEE Transactions on Dielectrics and Electrical Insulation
JF - IEEE Transactions on Dielectrics and Electrical Insulation
SN - 1070-9878
IS - 1
M1 - 7873508
ER -