环氧树脂基PET复合材料超导应用可行性研究  

Feasibility study on the superconducting application of PET reinforced bisphenol A epoxy resin composite

作　　者：曹益 潘皖江 朱银锋[3] 吴诚 沈默 Cao Yi;Pan Wanjiang;Zhu Yinfeng;Wu Cheng;Shen Mo(Hefei Institute of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;School of Mechanical and Electrical Engineering,Anhui Jianzhu University,Hefei 230601,China)

机构地区：[1]中国科学院合肥物质科学研究院,合肥230031 [2]中国科学技术大学,合肥230026 [3]安徽建筑大学机械与电气工程学院,合肥230601

出　　处：《低温与超导》2021年第4期26-30,共5页Cryogenics and Superconductivity

基　　金：国家自然科学基金面上项目(51877001);安徽省高等学校自然科学研究重点项目(KJ2019A0789);河南省中国科学院科技成果转移转化项目(2019105)资助。

摘　　要：在超导电物理装置中,超导磁体系统绝缘在极低温条件下由于脆性增大容易损坏,因此发展低温抗疲劳、易导热和介电性能优良的绝缘材料十分必要。为了探索电工用途的PET(聚对苯二甲酸乙二醇酯)纤维在超导绝缘领域应用的可行性,以PET增强双酚A环氧树脂复合材料制作的样品为研究对象开展了电阻率、介电常数、介质损耗测试,电阻率测试表明,PET增强双酚A环氧树脂复合材料具有优良的绝缘性能,而纤维的空间布局及环境温度是影响复合材料介电性能的主要因素。此外,针对室温和液氮浸泡的PET增强双酚A环氧树脂复合材料进行了微观组织分析,观察发现:经过增韧的环氧树脂复合材料微观结构平滑,在低温下具有更强的抗疲劳性能,而未经过增韧的复合材料容易产生微裂纹,导致抗疲劳性能和低温绝缘性能下降。初步的研究结果表明,PET增强双酚A环氧树脂复合材料在超导绝缘方面具有应用的可行性。Insulatinon material in superconducting magnet system is easy to break down due to the brittleness under extremely cryogenic temperature, so it is necessary to develop insulation materials with excellent cryogenic fatigue resistance, heat conduction and dielectric properties. In order to investigate the application feasibility of PET(polyethylene glycol terephthalate) reinforced bisphenol-A epoxy resin composite in the field of superconducting insulation, volume resistivity test, dielectric constant test and dielectric loss test were performed. The resistivity test results prove the PET reinforced bisphenol-A epoxy resin composite with excellent electrical property can fulfill the requirement in superconducting magnet. Dielectric constant and dielectric loss test show that the angle of fiber and temperature are probably the main factors that affect the dielectric properties of composites. Moreover, SEM tests of samples under room-temperature and LN2 temperature show that the microstructure of the toughened PET composite is smoothly, which can improve the fatigue resistance of composite material under cryogenic temperature. Contrarily, micro-cracks in un-toughened samples can lead to descending of insulation and fatigue resistance performance under cryogenic temperature. As a result, the preliminary research results show that PET reinforced bisphenol A epoxy resin composite has the application feasibility in the field of superconducting insulation.

关 键 词：环氧树脂 复合材料 超导磁体 介电常数 介质损耗 

分 类 号：TM215.92[一般工业技术—材料科学与工程]