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3705 |
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Dielectric properties of Al2O3 coatings deposited by atmospheric plasma spraying and dry-ice blasting correlated with the microstructural characteristics |
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Shujuan Dong* / IRTES-LERMPS,Université de Technologie de Belfort-Montbéliard, FRANCE Bo Song/ IRTES-LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, 90010 Belfort Cedex, France, France Chang-Jiu Li/ State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xian Jiaotong University, 710049 Xian, China, China Bernard Hansz/ HMRexpert, Impasse Bliss 25490 Fesches-le-Châtel, France, France Hanlin Liao/ IRTES-LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, 90010 Belfort Cedex, France, France Christian Coddet/ IRTES-LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, 90010 Belfort Cedex, France, France |
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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 characteristics, 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 spraying process allowed producing coatings with better dielectric properties than those prepared without dry-ice blasting. The dielectric properties were correlated with the microstructural characteristics, including the coating thickness, porosity and phase composition. |