Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1637107 | Transactions of Nonferrous Metals Society of China | 2012 | 9 Pages |
Abstract
ZnO varistor ceramics doped with Bi2O3, Sb2O3, Co2O3, Cr2O3, and MnO2 were prepared separately by two high-energy ball milling processes: oxide-doped and varistor ceramic powder. A comparison in the electrical and microstructural properties of the samples obtained by both methods was made. The best results on these characteristics were achieved through the high-energy ball milling varistor ceramic powder route, obtaining a nonlinear coefficient of 57 and a breakdown field of 617 V/mm at a sintering temperature of 1000 °C for 3 h. The samples synthesized by this technique show not only high density value, 95% of the theoretical density, but also a homogeneous microstructure, which compete with those obtained by the high-energy ball milling oxide-doped powder route. With the advantage that the high-energy ball milling varistor ceramic powder route can refine grain, increase the driving force of sintering, accelerate the sintering process, and reduce the sintering temperature.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Dong XU, Dong-mei TANG, Lei JIAO, Hong-ming YUAN, Guo-ping ZHAO, Xiao-nong CHENG,