Dielectric properties of HVOF sprayed ceramic coatings

2013 IEEE International Conference on Solid Dielectrics (ICSD) Pub Date : 2013-10-08 DOI:10.1109/ICSD.2013.6619769

M. Niittymaki, K. Lahti, T. Suhonen, U. Kanerva, Jarkko Metsajoki

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引用次数: 9

Abstract

Thermally sprayed ceramic coatings can be used as electrical insulators for example in high temperature applications (e.g. fuel cells) or in other demanding conditions. In electrical insulation applications the mostly used coating materials are aluminum oxide, magnesium oxide and magnesium aluminate. In general, only few reports of dielectric properties of thermally sprayed ceramic coatings can be found in literature and further analysis is thus needed. In addition, the measurement methods and conditions in previous research are often not fully documented, complicating the evaluation and comparison of the properties of different coatings. The aim of this paper was to characterize dielectric properties of thermally sprayed ceramic spinel coating sprayed with high-velocity oxygen fuel (HVOF) technique. The studied dielectric properties are DC resistivity, DC dielectric breakdown strength, as well as permittivity and dielectric losses at different frequencies. All measurements were made at temperature of 20 °C and at relative humidity of 20 %. Dielectric properties and the composition of coating material are presented and analyzed.

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HVOF喷涂陶瓷涂层的介电性能

热喷涂陶瓷涂层可以用作电绝缘体，例如在高温应用中(例如燃料电池)或在其他苛刻的条件下。在电气绝缘应用中，最常用的涂层材料是氧化铝、氧化镁和铝酸镁。总的来说，文献中关于热喷涂陶瓷涂层介电性能的报道很少，因此需要进一步分析。此外，以往研究中的测量方法和条件往往没有完整的记录，这使得不同涂层性能的评估和比较变得复杂。采用高速氧燃料(HVOF)技术对热喷涂尖晶石陶瓷涂层的介电性能进行了研究。研究了不同频率下的直流电阻率、直流介电击穿强度、介电常数和介电损耗。所有测量均在温度为20°C，相对湿度为20%的条件下进行。介绍并分析了涂层材料的介电性能和组成。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2013 IEEE International Conference on Solid Dielectrics (ICSD)

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