纳米SiO_(2)/聚丙烯复合材料的电老化寿命评估  

Evaluation of electrical aging life of nano SiO_(2)/PP composites

作　　者：高俊国[1] 张广威 刘艳丽 鞠惠丞 刘力伟 刘雄军 韩啸 GAO Junguo;ZHANG Guangwei;LIU Yanli;JU Huicheng;LIU Liwei;LIU Xiongjun;HAN Xiao(Key Laboratory of Engineering Dielectrics and Its Applications,Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China;Jiangsu Shangshang Cable Group Academy of Science and Technology,Liyang 213300,China)

机构地区：[1]哈尔滨理工大学工程电介质及其应用教育部重点实验室,哈尔滨150080 [2]江苏上上电缆集团科学技术研究院,溧阳213300

出　　处：《复合材料学报》2024年第3期1270-1280,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51577045);黑龙江省博士后科研启动基金(LBH-Q19106)。

摘　　要：探究新型环保材料聚丙烯(PP)绝缘和其纳米SiO_(2)复合材料的电老化寿命,为后期PP绝缘电缆应用可靠性提供理论支撑。基于电老化寿命公式-反幂定律,通过恒压加速老化试验估算了PP绝缘和SiO_(2)/PP复合材料的寿命模型参数,再采用逐级升压加速老化试验对寿命指数n的可靠性进行评估。并对SiO_(2)/PP复合材料进行结构表征和性能测试。结果表明,SiO_(2)/PP6的寿命指数n为14.61,相较PP6的12.54提升了16.51%;试验阶段发现在较低老化场强下SiO_(2)的掺杂对PP6的失效时间提升效果明显,预测SiO_(2)/PP6在老化场强25 kV·mm^(-1)以下的长期电老化寿命是PP6的5倍以上。同时,掺杂纳米SiO_(2)使PP绝缘的工频介电损耗因数和损耗峰高度降低。基于电老化空腔理论,提出了SiO_(2)通过消耗热电子能量限制链段断裂,从而提升PP绝缘电老化寿命的观点。The electrical aging life of polypropylene(PP) insulation,a new environmentally friendly material,and its nano-SiO_(2) composites were investigated to provide theoretical support for the reliability of PP-insulated cables in later applications.Based on the electric aging life formula-inverse power method,the life model parameters of PP insulation and SiO_(2)/PP composites were estimated by constant voltage accelerated aging test,and then the reliability of life index n was evaluated by stepwise accelerated aging test.The SiO_(2)/PP composites were also structurally characterized and performance tested.The results show that the lifetime index n of SiO_(2)/PP6 is 14.61,which is enhanced by 16.51% compared with that of PP6 of 12.54.It is found in the experimental stage that the doping of SiO_(2)has a significant effect on the enhancement of PP6's time to failure at lower aging field strengths,and it is predicted that the long-term electrical aging lifetime of SiO_(2)/PP6 is more than five times that of PP6 below the aging field strength of 25 kV·mm^(-1).Meanwhile,the doping of nano-SiO_(2) reduced the industrial frequency dielectric loss factor and lowered the loss peak height of PP insulation.Based on the electrical aging cavity theory,it is proposed that SiO_(2) enhances the electrical aging life of PP insulation by limiting the chain segment breakage by consuming hot electron energy.

关 键 词：聚丙烯绝缘 电老化寿命 纳米SiO_(2) 加速电老化试验 复合材料 

分 类 号：TM855[电气工程—高电压与绝缘技术] TB332[一般工业技术—材料科学与工程]