电工技术学报2025，Vol.40Issue(11)：3680-3690,11.DOI:10.19595/j.cnki.1000-6753.tces.L11043
氧化锌-聚四氟乙烯基复合陶瓷材料的冷烧结及电气性能研究
Study on Electrical Properties of Zinc Oxide-Polytetrafluoroethylene-Based Composite Ceramic Materials by Cold Sintering Process
摘要
Abstract
ZnO-based functional ceramics are widely used in the fields of varistor,thermistor,and gas-sensing.However,the temperature required for the preparation of ZnO-based functional ceramic is still high(＞1 000℃).As a result,the additives that lead to modulating the properties of ceramic materials are limited to inorganic fillers.Conventional sintering leads to excessive growth of ZnO grains,which makes it difficult to achieve the miniaturization requirements of ZnO-based functional ceramic devices.Cold sintering process(CSP)enables the densification of ceramic materials at temperatures of below 300℃,thus providing the possibility for grain boundary engineering using ceramic materials as the matrix with organic polymer fillers or organic/inorganic composite fillers. In this paper,zinc oxide(ZnO)-polytetrafluoroethylene(PTFE)-based ceramic composites were prepared by CSP.Based on the above cold sintering conditions,high-density(＞97%)ZnO-PTFE composite ceramics were prepared with ZnO as the matrix and polytetrafluoroethylene(PTFE)as the filler.The electrical properties of the ZnO-PTFE specimens showed better non-ohmic characteristics at the polymer content of 15%,the breakdown field and nonlinear coefficient of the composites can reach 933.68 V/mm and 5.74.The breakdown field is 6.92 times higher than the classical five-element formulation of ZnO varistor(135 V/mm),but the nonlinear coefficient is low.Microstructure observation and impedance performance testing showed that the PTFE phase limits the grain growth and increases the ceramic grain boundary impedance.PTFE at grain boundaries can induce the formation of varistor properties of ZnO-based composite ceramics,and improve the flexibility of ZnO ceramics. Further,the effects of metal oxides and PTFE on the microstructures and electrical properties of ZnO-PTFE based composites were investigated.The results indicate that a high relative density of over 97%was achieved for ZnO-PTFE-based composites doped with PTFE or co-doped with PTFE and metal oxides(CoO,Mn2O3).It is found that the electrical properties of ZnO-PTFE-based composites were significantly enhanced with the co-doping of PTFE,CoO,and Mn2O3.Specifically,the breakdown field and nonlinear coefficient of the composites were improved to 3 555.56 V/mm and 13.55,respectively.The J-E results show that the electrical conduction of the ceramic composites were dominated by the thermionic field emission at grain boundary.Moreover,the elastic modulus of the ceramic composites decreases greatly with the addition of PTFE and then increases after doping metal oxides(CoO,Mn2O3). This study demonstrates that CSP provides a new route to fabricate ceramic-polymer-based composites and modulate their properties.关键词
氧化锌/聚四氟乙烯/冷烧结/晶界设计/非线性系数Key words
Zinc oxide/polytetrafluoroethylene/cold sintering/grain boundary design/nonlinear coefficient分类
信息技术与安全科学引用本文复制引用
侯欣源,肖永健,杨洋,任成君,赵学童..氧化锌-聚四氟乙烯基复合陶瓷材料的冷烧结及电气性能研究[J].电工技术学报,2025,40(11):3680-3690,11.基金项目
国家电网公司科技项目(5500-202399372A-2-2-ZB)和教育部霍英东教育基金(171050)资助. （5500-202399372A-2-2-ZB）
