【摘要】 综述了氧化锌电阻片的导电机理、老化机理、添加剂以及制备工艺等方面的研究进展,并从三方面指出了高性能氧化锌电阻片的发展趋势。①提高ZnO粉体的质量,如制备纯度高、粒径分布好、易于分散的纳米ZnO粉体,特别是将其他掺杂成分如Bi2O3等在制粉过程引入,制备纳米复合粉末,将可从根本上改善掺杂成分的均匀性,从而大幅度地提高氧化锌电阻片的性能;②采用新的烧结工艺,如微波或微波等离子烧结氧化锌电阻片,已展示良好的应用前景,但还存在工艺控制稳定性和规模化生产等问题。因此,应进一步探讨和完善新的烧结工艺,以降低烧结能耗,提高烧成质量和产品合格率;③开发高电位梯度的氧化锌电阻片是电网系统用避雷器小型化的关键,特别对超高压、特高压输变电工程意义重大;④加强相关基础理论的研究,尤其是晶界现象、导电机理、失效模式及其与显微结构关系的研究。更多还原

【Abstract】 The author describes mechanism of conductivity and ageing of ZnO varistor,investigation progress in its processing,and trend of high grade ZnO varistor.1.Enhancement of ZnO powder quality grade using easy dispersed nanometric ZnO powder of high purity and well distributed size,dosing Bi2O3,etc in powder preparating process.Preparation of nanometric composite powder may considerably improve dosing homogeneity and thus enhance varistor grade.2.Application of new prospective sintering technology such as microwave or microwave plasma sintering process.But still it has to enhance technological stability and organize mass production.Hence new sintering process shall be developed and improved to reduce energy consumption,enhance sintering quality and acceptance rate.3.Development of ZnO varistor with high electrical gradient as the key element of mini-type MOA for EHV and UHV power transmission projects.更多还原