Nd_2O_3对氧化锌压敏阀片压敏电位梯度与显微组织的影响  

Influence of Nd_2O_3 on Voltage and Microstructure of ZnO Varistor Materials

作　　者：严群[1] 陈家钊[1] 涂铭旌[1] 

机构地区：[1]四川大学,四川成都610065

出　　处：《稀有金属材料与工程》2005年第1期154-157,共4页Rare Metal Materials and Engineering

摘　　要：研究了微量Nd2O3添加剂对氧化锌压敏阀片的压敏电位梯度的影响,并对其微观组织进行了分析研究,从理论上探讨了Nd2O3影响氧化锌压敏阀片压敏电位梯度与组织的机理.研究结果表明,在0 mol%～0.04 mol%成分范围内,随着Nd2O3含量的增加,氧化锌压敏阀片的压敏电位梯度明显提高;当Nd2O3含量超过0.04mol%时,随其含量的增加,氧化锌压敏阀片的压敏电位梯度又呈降低趋势.其原因是Nd2O3加入到氧化锌压敏阀片中,使晶粒尺寸减小所致.The effect of Nd2O3 on voltage and microstructure of ZnO varistor was studied. and a theoretical analysis of the mechanism of the effect was conducted. The results show that the voltage of ZnO varistor increases with the increase of Nd2O3; content in the rang: of 0 mol%similar to0.04 mol%. But when the content of Nd2O3 is more than 0.04 mol%, the voltage of ZnO varistor decreases with the increase of the content. The microstructure analysis indicates that the minimal additive exists in ZnO grain boundary in the form of a new compound and hinders the movement of grain boundary, which reduces the size of ZnO grain size and makes the grain more uniform. and as a result. Nd2O3 improve the voltage of the varistor greatly.

关 键 词：氧化锌压敏阀片 ND2O3 压敏电位梯度 显微组织 

分 类 号：TM862[电气工程—高电压与绝缘技术]