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Dielectric properties of Al2O3 coatings deposited via atmospheric plasma spraying and dry-ice blasting correlated with microstructural characteristics

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Abstract

In this work, atmospheric plasma spraying combined with dry-ice blasting have been used to prepare alumina (Al2O3) coatings designed for insulating applications. The microstructural characteristics and dielectric properties of Al2O3 coatings were presented. The electrical insulating properties, i.e., dielectric strength and breakdown voltage, were investigated by dielectric breakdown test using direct current and alternating current. Relationships between dielectric properties and coating characteristics were discussed. The results showed that dry-ice blasting used during atmospheric plasma spray process allowed the production of coatings with better dielectric properties than those prepared without dry-ice blasting. The dielectric properties were correlated with the microstructural characteristics, not with phase composition.

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Acknowledgments

The authors are indebted to Oseo IC5000 program (LS 10003 CR-01) and European Marie-Curie programme (IPACTS PIRSES-GA-2010-268696) for financial support.

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Authors and Affiliations

  1. IRTES-LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, 90010, Belfort Cedex, France

    Shujuan Dong, Bo Song, Hanlin Liao & Christian Coddet

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  1. Shujuan Dong
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  2. Bo Song
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  3. Hanlin Liao
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  4. Christian Coddet
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Correspondence to Shujuan Dong or Bo Song.

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Dong, S., Song, B., Liao, H. et al. Dielectric properties of Al2O3 coatings deposited via atmospheric plasma spraying and dry-ice blasting correlated with microstructural characteristics. Appl. Phys. A 118, 283–290 (2015). https://doi.org/10.1007/s00339-014-8677-8

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  • DOI: https://doi.org/10.1007/s00339-014-8677-8

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