Bi2O3 Vaporization in Microwave-Sintered ZnO Varistors |
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| Authors: | Lin Cong Xu Zheng Peng Hu Sun Dan-feng |
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| Affiliation: | Department of Material Science and Engineering, Tongji University, Shanghai 200092, China; Changsha Longtech Syno-Therm Co. Ltd., Hunan 410013, China; Suzhou Sinotronix Electronics Co. Ltd., Jiangsu 215011, China |
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| Abstract: | Vaporization of Bi2O3 in microwave-sintered ZnO varistors is discussed in this study. The Bi2O3 vaporization of ZnO varistors sintered by a conventional electric furnace is also studied for comparison. The results show that the Bi2O3 vaporization in microwave-sintered ZnO varistors is more homogenous from the surface to the inside of the sample, which results from the special thermal gradient inside the microwave-sintered samples, and we also find out that the Bi2O3 vaporization directly affects the electrical properties of ZnO varistors. Microwave-sintered samples exhibit more excellent electrical properties than the conventional ones because the homogenous Bi2O3 vaporization leads to more uniform microstructures. |
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