JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 13
·12113-12121
·
IF 2.195
Ruan Xuejun,Ren Xin,Zhou Wenting,Xu Xi,Wang Xin,Wang Manyu,Yan Ying,Yao Zheng,Shi Wen,Yu Wenqi
The effect of various proportions of SiO 2 and Cr 2 O 3 doping on the micro-characteristics and the electrical properties of the ZnO varistors were investigated. As the SiO 2 /Cr 2 O 3 ratio increased, the voltage gradient increased and then decreased, the nonlinear coefficient α increased, while the leakage current showed the opposite trend, meanwhile the residual voltage ratio was almost stable. When the SiO 2 /Cr 2 O 3 ratio was 1.7 mol% vs. 0.6 mol%, the ZnO varistors sintered at 1155 °C exhibited excellent comprehensive electrical properties with voltage gradient of 329.9 V/mm, nonlinear coefficient of 65.1, leakage current of 0 µA, residual voltage ratio of 1.663, and aging starting power of 0.72 W. The varistors were in good condition after being struck 18 times of 250 A square wave energy pulse impact, showing a great potential in the industrial application of power distribution systems.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Wenfeng Liu,Lei Zhang,Fanyi Kong,Kangning Wu,Shengtao Li,Jianying Li
In the present study, both enhanced voltage gradient of 803 V/mm and superior energy absorption capability of 400 J/cm 3 were achieved in ZnO varistors prepared by nano-sized raw powders. Further analysis indicated that such improvement could be ascribed to the refined micromorphology. As shown by SEM pictures, the average grain size was dramatically decreased by the nano-sized powders, which contributed to the enhanced voltage gradient. Meanwhile, the homogeneous grain size distribution resulted in the improved energy absorption capability. The improved varistors in the present study showed high potential for ultra-high voltage applications. In addition, we proposed an effective approach to quantitatively evaluate the grain size distribution, which is the key parameter for the electrical properties of the varistors. It provided a guideline for further modifications on wide range of electronic ceramics .
研究领域:
材料科学
·
电子陶瓷
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 3
·1-12
·
IF 2.8
Ren Xin,Yang LiYu,Cheng Qi,Ning Yu,Gao Li,Liu XiaoMan,You JunWei,Yao Zheng,Shi LiYi
The effects of polyvinyl alcohol (PVA) on the slurry, granules, green bodies, and sintered varistors were investigated. The results showed that PVA inclusion as a binder not only influenced the mechanical properties of the granules, but also significantly impacted on the dispersibility of the slurry, the microstructure's uniformity, the compactness, and the element doping homogeneity of the varistors. These effects greatly affected the electrical properties, including the non-linear characteristics and the energy withstand capability. The optimal PVA concentration was found to be 0.7 wt%, resulting in varistors with excellent electrical properties: breakdown voltage gradient of 247.7 V/mm, nonlinearity coefficient of 41.0, residual voltage ratio of 1.71 under an 8/20 μs impulse current of 5 kA, and 100% pass rate under 2 ms rectangular waveform impulses of 900 A.
研究领域:
材料科学
·
电气工程
·
陶瓷
·
高分子科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yang Yu,Siyuan Li,Yu Feng,Dechao Bu,Xuan Gao,Ling Weng,Qingguo Chen
Due to their excellent electrical potential stranglehold capability to over-voltage, ZnO-Bi 2 O 3 based varistor ceramics are extensively utilized in surge arresters. Unfortunately, Bi 2 O 3 has high volatility at high-temperature sintering, and ZnO-Bi 2 O 3 based varistor ceramics has a complex formulation that is difficult to control. Recently, the approach of constructing defect dipoles through defect engineering have emerged as an effective strategy to enhance the performance of electroceramics. In this paper, we introduce Fe 3+ as donor and Li + as acceptor to replace Zn 2+ for constructed defective dipole pairs in the ZnO lattice. The substitution enables induced the nonlinear conductivity properties in ZnO at lower doping levels. Meanwhile, the result as designed (Fe 0.5 Li 0.5 ) x Zn 1- x O 2 varistor ceramics ( x = 20 mol%) exhibit a breakdown voltage gradient E b of 1422.09 V/mm. The research provides a new perspective for developing high-performance bismuth-free ZnO-based varistor ceramics.
研究领域:
材料科学
·
电瓷材料
·
固态物理
·
电子器件
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）