Properties of ZnO Varistors Prepared with Nano-sized Powders

摘要：

　　ZnO varistors with higher voltage gradients are expected in the power system,and the key to this property is to diminish the grain size.In this paper,nano-sized ZnO particles are used as the raw material in order to obtain small grains.Pellets are fabricated by two sintering methods:the conventional pressureless sintering and the spark plasma sintering (SPS).For the samples fabricated by the conventional sintering,the average grain size varies from 1 μm to more than 10 μm when the sintering temperature changes from 900 ℃ to 1200 ℃.The voltage gradient can reach as high as 2020 V/mm.The grain size of the SPS samples is less than 1 μm,and the voltage gradients can reach 963 V/mm.

关键词： ZnO varistor Nano-sized powder SPS

作者: Fengchao LUO Jintiang He Yuanhua Lin Jun Hu

作者单位: State Key Lab of Power Systems,Dept.of Electrical Engineering,Tsinghua University,Beijing 100084,Chi Dept.of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

会议类型: 国际会议

会议名称: The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))

会议地点: 长沙

会议语种:英文

页码: 514-516

在线出版日期: 2007-05-10（万方平台首次上网日期，不代表论文的发表时间）