Dielectric Properties of Boron Nitride Filled Epoxy Composites

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI:10.1109/CEIDP.2006.312052

Chaowu Zhang, G. Stevens

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引用次数: 22

Abstract

In this paper, we report some preliminary measurements on the dielectric response and properties of boron nitride filled epoxy resin composites consisting of a typical anhydride cured bisphenol-A epoxy resin system. Both conventional stirring and ultrasonic processing had been used to obtain fine dispersion of the microfillers in the matrix. Dielectric spectroscopy of the samples has been undertaken in the frequency domain from 10-2 Hz to 106 Hz and in the temperature range from -50 to 120 degC. The results showed that the dielectric constant of the composites increase slightly with increasing concentration of fillers. A broad loss peak is present in the low frequency region in all samples from pure epoxy resin to composites with 20 wt% of boron nitride. This peak moves to higher frequencies with increasing temperature, and no obvious difference in position and shape of this peak is found across all levels of filling at each temperature. The dc conduction current has also been measured in the temperature range from -50 to 120 degC. The results showed that there is no significant difference in the dc conduction current across this temperature range and there is only a weak dependence on the concentration of the fillers above 60 degC.

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氮化硼填充环氧复合材料的介电性能

本文报道了由典型的酸酐固化双酚a环氧树脂体系组成的氮化硼填充环氧树脂复合材料的介电响应和性能的一些初步测量结果。采用常规搅拌和超声处理方法使微填料在基体中得到了良好的分散。样品的介电光谱在10-2 Hz至106 Hz的频域和-50至120℃的温度范围内进行。结果表明，随着填料浓度的增加，复合材料的介电常数略有增加。从纯环氧树脂到含20%氮化硼的复合材料，在低频区均存在宽损耗峰。随着温度的升高，该峰值向更高的频率移动，并且在每个温度下的所有填充级别中都没有发现该峰值的位置和形状的明显差异。直流传导电流也被测量在温度范围从-50到120摄氏度。结果表明，在该温度范围内，直流传导电流没有显著差异，在60℃以上，填料浓度对直流传导电流的影响较弱。

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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2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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