γ射线辐照对氰酸酯-环氧树脂材料低温电气性能的影响  

γIrradiation Effects on Electric Properties of Cyanate-ester Epoxy at Cryogenic Temperatures

作　　者：王劭鹤 屠幼萍 樊林禛 秦司晨 李来风[2] 吴智雄[2] WANG Shaohel;TU Youpingl;FAN Linzhen;QIN Sichenl;LI Laifeng;WU Zhixiong(Beijing Key Laboratory of High Voltage ＆ Electromagnetic Compatibility（North China Electric Power University）, Changping District, Beijing 102206, China;Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Haidian District, Beijing 100190, China)

机构地区：[1]高电压技术与电磁兼容北京市重点实验室(华北电力大学),北京市昌平区102206 [2]中国科学院理化技术研究所低温工程学重点实验室,北京市海淀区100190

出　　处：《中国电机工程学报》2018年第9期2815-2820,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51277062,51407180,51577062)~~

摘　　要：大型超导磁体中采用的绝缘材料需要在极低温和强辐射的环境下保持良好的电气以及机械性能。文中以氰酸酯和双酚F环氧共混作为基底,无硼玻璃纤维进行增韧改性,采用真空浸渍工艺制备出改性的玻璃增强环氧树脂绝缘材料（glass fibre reinforced polymer,GFRP）,并对其进行1 MGy和5 MGy的γ射线辐照。在20~300K温度环境下对环氧复合材料的介电性能以及电导电流特性进行测试分析。测试结果表明,温度降至20K过程中,介电损耗γ峰对应的频率变化不大,幅值随着温度降低呈整体下降趋势,且高频区域没有出现新的损耗峰,GFRP材料的环氧-玻璃纤维界面性能保持良好。200K以下材料的电导率低,空间电荷限制电流阈值场强高;辐照对材料的作用表现为先交联后降解的过程,以降解过程为主,材料整体耐辐照性能较高。Insulation materials used in large scale superconducting magnet need to maintain sound electric and mechanic performance under cryogenic temperature and intense γ radiation conditions. In this research, cyanate ester and bisphenol F epoxy resin were mixed as matrix, which was reinforced by boron glass fibre, and the glass fibre reinforced polymer（GFRP） was manufactured by vacuum pressure impregnation method and irradiated by γ rays for 1 MGy and 5 MGy. Dielectric properties and conduction current were tested and analysed at temperatures within 20~300 K. The test results shown that, as sample being cooled to 20 K, the γ peak of dielectric loss presented little change in its corresponding frequency, and the amplitude keeps decreasing with temperature. No loss peak was detected within the high frequency range, which indicates cryogenic temperature had little effect on interface between epoxy resin and glass fibre. The conduction current was weak at temperatures below 200 K, and the space charge limited current threshold field was increased; crosslinking reaction was observed during irradiation and followed by degradation, and the later dominated the whole process generally, and the material was proved to be with high resistance to irradiation.

关 键 词：环氧树脂 低温 真空 辐照 介电特性 电导电流 

分 类 号：TM85[电气工程—高电压与绝缘技术]