Roles of Dopants in Sintering Behavior of ZnO-Based Varistor

摘要：

　　Three series of ZnO-based materials with different doping levels were prepared.The correlation between the composition and microstructure,and the roles of main dopants,Bi2O3 and Sb2O3,in the sintering behaviors were proposed.Both Bi2O3 and Sb2O3 evaporated at 1115℃,but the amount of them,in which bismuth is the majority,is not significant.Bi2O3 functioned mainly as liquid during sintering to promote the sintering of ZnO,but it doesnt mean the materials will be denser.The bismuth-rich phase retracted into small pores during cooling,leaving the big pores as voids at room temperature.More Bi2O3 added would result in less increase in material densities and dramatic decrease in relative densities,and a little bit increase in grain sizes of matrix ZnO.Sb2O3 would react with ZnO matrix into spinel,Zn7Sb2O12,which will pin at the grain boundary of ZnO to control the ZnO grain growth.The more Sb2O3 added,the smaller the grain sizes of ZnO.Appropriate amount of Sb2O3 added will yield denser materials.

关键词： ZnO Varistor Sintering behavior Dopant

作者: Zhijian Peng Chengbiao Wang Ludwig J.Gauckler Hezhuo Miao

作者单位: School of Engineering and Technology,China University of Geosciences,Beijing 100083,China Department of Materials Science,Nonmetallic Inorganic Materials,Swiss Federal Institute of Technolog State Key Laboratory of New Ceramics and Fine Processing,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: 479-482

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）