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| 1 | 多层介孔纳米MgO/低密度聚乙烯复合材料的制备及其绝缘性能显示文摘塑料高压直流电缆在电力输运中,绝缘层容易发生电子及空穴注入并局部积聚,形成空间电荷包,长期运行容易引发绝缘失效。为此,抑制电子及空穴的注入、积聚,防止空间电荷包的产生是制备塑料高压直流电缆的关键技术。通过制备多层介孔结构纳米MgO,采用低沸点溶剂法,实现了纳米MgO在低密度聚乙烯(LDPE)中的均匀分散。研究了1wt%纳米MgO/LDPE复合材料的空间电荷行为、直流击穿强度、热刺激电流及介电特性。结果表明:添加1wt%纳米MgO的LDPE在70kV/mm电场下有效地抑制了空间电荷积聚,提高了直流击穿强度,降低了介电常数;热刺激电流研究表明纳米MgO形成了新的陷阱,有效捕获了载流子,形成独立电场,避免了局部有效电场,形成新的势垒,抑制了电极载流子的注入,最终抑制了空间电荷积聚。 | 巫运辉 查俊伟 王思蛟 闫轰达 党智敏 | 2016 | 复合材料学报2016，33，3： | 5 |
| 2 | AC ageing characteristics of Co-doped ZnO varistors显示文摘As the key protection device in the power system, the ageing characteristics of ZnO varistor can directly affect the safe operation of power system. In order to study the influence of Co2O3 content on the electrical properties of ZnO varistors, thermally stimulated current (TSC) characteristics test, capacitance-voltage (C-V) characteristics test, scanning electron microscope (SEM) test, voltage-current (V-I) test were carried out on ZnO varistors before and after AC ageing tests. The results show that the mean grain size decreases while the varistor voltage increases as the Co2O3 content increases, the barrier height and the defects of ZnO varistors increase with the increase of Co2O3 content, and the barrier height decreases at a certain degree after AC ageing test. As the Co2+ ion radius is close to that of Zn2+ ion, it is easy for Co2+ ions to enter into ZnO lattice during sintering process, which is account for the increase of zinc interstitial of ZnO varistors. When the Co2O3 content exceeds a certain range, the AC degradation degree of ZnO varistors will become much more serious. From the experimental results, ZnO varistors doped with 1.0 mol% Co2 O3 exhibit a better performance. | TU YouPing WANG Qian HE Jie LI Xiao DING LiJian | 2013 | Science China(Technological Sciences)2013，56，6： | 1 |
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