Nano-size positive temperature coefficient (PTC) ceramic particles and epoxy composites doped with 0, 0.5, 1, 5, 10 and 20 phr of PTC nanoparticles are prepared to suppress the decrease of electrical resistivity with temperature. Electrical resistivity under 30, 50, 70, 90, and 110 °C, DC breakdown strength, and trap characteristic are measured. DC electric field distribution under radical temperature gradient is simulated using a simplified bushing model insulated with prepared materials. The mechanism for the regulating of electrical resistivity-temperature characteristic of epoxy composites is discussed. The electrical resistivity at 110 °C, DC breakdown strength at 110 °C, and electric field distortion of the epoxy composite with 1 phr PTC nanoparticles is 454, 131 and 74%, respectively of the neat epoxy resin, which exhibits potential to be used as insulating materials in high voltage DC electrical systems.

中文翻译：

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环氧/正温度系数陶瓷纳米复合材料中温度依赖性电阻率的优化


制备了纳米级正温度系数（PTC）陶瓷颗粒和掺杂有0、0.5、1、5、10和20份PTC纳米颗粒的环氧复合材料，以抑制电阻率随温度的下降。测量 30、50、70、90 和 110 °C 下的电阻率、直流击穿强度和陷阱特性。使用用制备的材料绝缘的简化套管模型来模拟激进温度梯度下的直流电场分布。讨论了环氧复合材料电阻率-温度特性的调控机理。含有1份PTC纳米颗粒的环氧复合材料的110℃电阻率、110℃直流击穿强度和电场畸变分别是纯环氧树脂的454%、​​131%和74%，具有应用潜力作为高压直流电气系统中的绝缘材料。