DC dielectric breakdown behaviour of thermally sprayed ceramic coatings

Minna Niittymaki, Tomi Suhonen, Jarkko Metsäjoki, Kari Lahti

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

    Abstract

    Previous studies of dielectric properties of thermally sprayed insulating ceramic coatings are focused on linearly ramped dielectric breakdown strength as well as DC resistivity, relative permittivity and dielectric loss characterizations. However, reports of the effects of ramp rate or of any kind of long term stressing on the breakdown strength cannot be found in literature. The aim of this paper was to study the DC breakdown behavior of one type of HVOF sprayed alumina coating under different stresses. It can be concluded that the ramp rate of DC breakdown measurement has no remarkably influence on the breakdown strength. The breakdown behavior was also studied using step-by-step tests with two constant step voltages and step durations. The DC resistivity of the alumina coating showed strong dependence on the applied electric field. The resistivity behaved ohmicly below the field strength of ~0.5 V/μm and above ~8…12 V/μm, however, the resistivity decreased approximately three decades in the nonohmic region (0.5 V/μm ). At electric field strengths above ~25 V/μm, the degradation started in the material leading to breakdown. However, when the step duration was longer (60 min), the degradation process started already slightly below the applied field of 25 V/μm.
    Original languageEnglish
    Title of host publication24th Nordic Insulation Symposium on Materials, Components and Diagnostics
    PublisherDanmarks Tekniske Universitet
    Pages80-85
    Publication statusPublished - 2015
    MoE publication typeNot Eligible

    Fingerprint

    ceramic coatings
    sprayed coatings
    breakdown
    direct current
    electrical resistivity
    ramps
    aluminum oxides
    degradation
    coatings
    electric field strength
    dielectric loss
    dielectric properties
    field strength
    permittivity
    electric fields
    electric potential

    Cite this

    Niittymaki, M., Suhonen, T., Metsäjoki, J., & Lahti, K. (2015). DC dielectric breakdown behaviour of thermally sprayed ceramic coatings. In 24th Nordic Insulation Symposium on Materials, Components and Diagnostics (pp. 80-85). Danmarks Tekniske Universitet.
    Niittymaki, Minna ; Suhonen, Tomi ; Metsäjoki, Jarkko ; Lahti, Kari. / DC dielectric breakdown behaviour of thermally sprayed ceramic coatings. 24th Nordic Insulation Symposium on Materials, Components and Diagnostics. Danmarks Tekniske Universitet, 2015. pp. 80-85
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    Niittymaki, M, Suhonen, T, Metsäjoki, J & Lahti, K 2015, DC dielectric breakdown behaviour of thermally sprayed ceramic coatings. in 24th Nordic Insulation Symposium on Materials, Components and Diagnostics. Danmarks Tekniske Universitet, pp. 80-85.

    DC dielectric breakdown behaviour of thermally sprayed ceramic coatings. / Niittymaki, Minna; Suhonen, Tomi; Metsäjoki, Jarkko; Lahti, Kari.

    24th Nordic Insulation Symposium on Materials, Components and Diagnostics. Danmarks Tekniske Universitet, 2015. p. 80-85.

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

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    N2 - Previous studies of dielectric properties of thermally sprayed insulating ceramic coatings are focused on linearly ramped dielectric breakdown strength as well as DC resistivity, relative permittivity and dielectric loss characterizations. However, reports of the effects of ramp rate or of any kind of long term stressing on the breakdown strength cannot be found in literature. The aim of this paper was to study the DC breakdown behavior of one type of HVOF sprayed alumina coating under different stresses. It can be concluded that the ramp rate of DC breakdown measurement has no remarkably influence on the breakdown strength. The breakdown behavior was also studied using step-by-step tests with two constant step voltages and step durations. The DC resistivity of the alumina coating showed strong dependence on the applied electric field. The resistivity behaved ohmicly below the field strength of ~0.5 V/μm and above ~8…12 V/μm, however, the resistivity decreased approximately three decades in the nonohmic region (0.5 V/μm ). At electric field strengths above ~25 V/μm, the degradation started in the material leading to breakdown. However, when the step duration was longer (60 min), the degradation process started already slightly below the applied field of 25 V/μm.

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    Niittymaki M, Suhonen T, Metsäjoki J, Lahti K. DC dielectric breakdown behaviour of thermally sprayed ceramic coatings. In 24th Nordic Insulation Symposium on Materials, Components and Diagnostics. Danmarks Tekniske Universitet. 2015. p. 80-85