Role of microstructure in dielectric properties of thermally sprayed ceramic coatings

Minna Niittymäki; Ilkka Rytöluoto; Kari Lahti; Jarkko Metsäjoki; Tomi Suhonen

doi:10.1109/ICD.2016.7547811

Role of microstructure in dielectric properties of thermally sprayed ceramic coatings

Minna Niittymäki, Ilkka Rytöluoto, Kari Lahti, Jarkko Metsäjoki, Tomi Suhonen

Tampere University of Technology (TUT)

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

6 Citations (Scopus)

Abstract

Thermally sprayed insulating ceramic coatings can be utilized in conditions where polymers are inapplicable. The coatings exhibit a special lamellar microstructure with interfaces and some defects (e.g. voids, cracks) in between. The aim of this study was to analyze the relationship between the microstructural features and the dielectric properties of various thermally sprayed ceramics. The structural characterization of the ceramic coatings was made based on following properties: porosity, volumetric gas permeability and the characteristic size of crystalline lamella. High gas permeability of the coatings decreased the breakdown strength but similar effect cannot be seen in the DC resistivity and the permittivity results. Decrease of DC resistivity at high humidity did not correlate to microstructural properties; rather it is speculated to indicate the hydrophilic nature of the coatings. The characteristic crystalline domain sizes showed no clear correlation with the dielectric properties.

Original language	English
Title of host publication	Dielectrics (ICD), 2016 IEEE International Conference on
Publisher	IEEE Institute of Electrical and Electronic Engineers
Pages	1102-1105
ISBN (Electronic)	978-1-5090-2804-7, 978-1-5090-2805-4
DOIs	https://doi.org/10.1109/ICD.2016.7547811
Publication status	Published - 23 Aug 2016
MoE publication type	A4 Article in a conference publication
Event	1st International Conference on Dielectrics, ICD 2016 - Montpellier, France Duration: 3 Jul 2016 → 7 Jul 2016 Conference number: 1

Conference

Conference	1st International Conference on Dielectrics, ICD 2016
Abbreviated title	ICD 2016
Country/Territory	France
City	Montpellier
Period	3/07/16 → 7/07/16

Keywords

alumina
breakdown
ceramic
coating
microstructure
permittivity
Porosity
resistivity
spinel
spray
thermal
ProperTune

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10.1109/ICD.2016.7547811

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title = "Role of microstructure in dielectric properties of thermally sprayed ceramic coatings",

abstract = "Thermally sprayed insulating ceramic coatings can be utilized in conditions where polymers are inapplicable. The coatings exhibit a special lamellar microstructure with interfaces and some defects (e.g. voids, cracks) in between. The aim of this study was to analyze the relationship between the microstructural features and the dielectric properties of various thermally sprayed ceramics. The structural characterization of the ceramic coatings was made based on following properties: porosity, volumetric gas permeability and the characteristic size of crystalline lamella. High gas permeability of the coatings decreased the breakdown strength but similar effect cannot be seen in the DC resistivity and the permittivity results. Decrease of DC resistivity at high humidity did not correlate to microstructural properties; rather it is speculated to indicate the hydrophilic nature of the coatings. The characteristic crystalline domain sizes showed no clear correlation with the dielectric properties.",

keywords = "alumina, breakdown, ceramic, coating, microstructure, permittivity, Porosity, resistivity, spinel, spray, thermal, ProperTune",

author = "Minna Niittym{\"a}ki and Ilkka Ryt{\"o}luoto and Kari Lahti and Jarkko Mets{\"a}joki and Tomi Suhonen",

year = "2016",

month = aug,

day = "23",

doi = "10.1109/ICD.2016.7547811",

language = "English",

pages = "1102--1105",

booktitle = "Dielectrics (ICD), 2016 IEEE International Conference on",

publisher = "IEEE Institute of Electrical and Electronic Engineers",

address = "United States",

note = "1st International Conference on Dielectrics, ICD 2016, ICD 2016 ; Conference date: 03-07-2016 Through 07-07-2016",

}

Niittymäki, M, Rytöluoto, I, Lahti, K, Metsäjoki, J & Suhonen, T 2016, Role of microstructure in dielectric properties of thermally sprayed ceramic coatings. in Dielectrics (ICD), 2016 IEEE International Conference on. IEEE Institute of Electrical and Electronic Engineers, pp. 1102-1105, 1st International Conference on Dielectrics, ICD 2016, Montpellier, France, 3/07/16. https://doi.org/10.1109/ICD.2016.7547811

Role of microstructure in dielectric properties of thermally sprayed ceramic coatings. / Niittymäki, Minna; Rytöluoto, Ilkka; Lahti, Kari et al.
Dielectrics (ICD), 2016 IEEE International Conference on. IEEE Institute of Electrical and Electronic Engineers, 2016. p. 1102-1105.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Role of microstructure in dielectric properties of thermally sprayed ceramic coatings

AU - Niittymäki, Minna

AU - Rytöluoto, Ilkka

AU - Lahti, Kari

AU - Metsäjoki, Jarkko

AU - Suhonen, Tomi

N1 - Conference code: 1

PY - 2016/8/23

Y1 - 2016/8/23

N2 - Thermally sprayed insulating ceramic coatings can be utilized in conditions where polymers are inapplicable. The coatings exhibit a special lamellar microstructure with interfaces and some defects (e.g. voids, cracks) in between. The aim of this study was to analyze the relationship between the microstructural features and the dielectric properties of various thermally sprayed ceramics. The structural characterization of the ceramic coatings was made based on following properties: porosity, volumetric gas permeability and the characteristic size of crystalline lamella. High gas permeability of the coatings decreased the breakdown strength but similar effect cannot be seen in the DC resistivity and the permittivity results. Decrease of DC resistivity at high humidity did not correlate to microstructural properties; rather it is speculated to indicate the hydrophilic nature of the coatings. The characteristic crystalline domain sizes showed no clear correlation with the dielectric properties.

AB - Thermally sprayed insulating ceramic coatings can be utilized in conditions where polymers are inapplicable. The coatings exhibit a special lamellar microstructure with interfaces and some defects (e.g. voids, cracks) in between. The aim of this study was to analyze the relationship between the microstructural features and the dielectric properties of various thermally sprayed ceramics. The structural characterization of the ceramic coatings was made based on following properties: porosity, volumetric gas permeability and the characteristic size of crystalline lamella. High gas permeability of the coatings decreased the breakdown strength but similar effect cannot be seen in the DC resistivity and the permittivity results. Decrease of DC resistivity at high humidity did not correlate to microstructural properties; rather it is speculated to indicate the hydrophilic nature of the coatings. The characteristic crystalline domain sizes showed no clear correlation with the dielectric properties.

KW - alumina

KW - breakdown

KW - ceramic

KW - coating

KW - microstructure

KW - permittivity

KW - Porosity

KW - resistivity

KW - spinel

KW - spray

KW - thermal

KW - ProperTune

U2 - 10.1109/ICD.2016.7547811

DO - 10.1109/ICD.2016.7547811

M3 - Conference article in proceedings

SP - 1102

EP - 1105

BT - Dielectrics (ICD), 2016 IEEE International Conference on

PB - IEEE Institute of Electrical and Electronic Engineers

T2 - 1st International Conference on Dielectrics, ICD 2016

Y2 - 3 July 2016 through 7 July 2016

ER -

Role of microstructure in dielectric properties of thermally sprayed ceramic coatings

Abstract

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Keywords

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