Improvement of the electrical resistivity of epoxy resin at elevated temperature by adding a positive temperature coefficient BaTiO3-based compound

作     者：滕陈源 周文俊 周远翔 张灵 张云霄 周仲柳 李文鹏 Chenyuan TENG;Wenjun ZHOU;Yuanxiang ZHOU;Ling ZHANG;Yunxiao ZHANG;Zhongliu ZHOU;Wenpeng LI

作者机构：School of Electrical Engineering and AutomationWuhan UniversityWuhan 430072People's Republic of China China State Key Laboratory of Power System and Generation EquipmentDepartment of Electrical EngineeringTsinghua UniversityBeijing 100084People's Republic of China School of Electrical EngineeringXinjiang UniversityUrumqi 830047People's Republic of China State Key Laboratory of Advanced Power Transmission TechnologyGlobal Energy Interconnection Research Institute CorporationBeijing 102211People’s Republic of China 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2020年第22卷第4期

页      面：15-23页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：support from National Natural Science Foundation of China(No.51977186) the China Postdoctoral Science Foundation(No.2019M650029) the Young Elite Scientists Sponsorship Program by CAST(No.2018QNRC001) the National Key R&D Program of China(No.2017YFB0902704) the State Key Development Program of Basic Research of China(973 Program)(No.2014CB239501) the Science and Technology Project of the State Grid Corp.of China(No.52110418001Y). 

主　　题：epoxy resin positive temperature coefficient barium titanate based compounds resistivity-temperature characteristics traps 

摘      要：The DC electrical resistivity-temperature characteristic is an important property for insulating materials to operate at a high stress level.In order to improve the DC electrical resistivity at elevated temperature in a targeted way,a positive temperature coefficient(PTC)material(Ba Ti O3-based compound(BT60))was selected as the filler in this paper,whose electrical resistivity has a PTC effect when the temperature exceeds its Curie temperature.The BT60 was treated with hydrogen peroxide and(3-Aminopropyl)triethoxysilane.Epoxy composites with different loadings of BT60 fillers(0 wt%,0.5 wt%,and 2 wt%of epoxy)were prepared,denoted as EP-0,EP-0.5,and EP-2.It was shown that BT60 was able to maintain the DC breakdown strength when its loading was less than 2 wt%of epoxy.As the temperature exceeds 60°C,BT60 will compensate for the negative temperature coefficient effect of epoxy resin to some extent.The electrical resistivity of EP-2 was improved by 55%compared with that of neat epoxy at 90°C.It was found that the potential barrier at the grain boundary of BT60 and the deep traps in the interface between BT60 and the epoxy resin hinder the migration of carriers and thus increase the electrical resistivity of epoxy composite.