Results 41 to 50 of about 156,786 (215)

Synthesis by Hydrothermal Treatment of ZnO-Based Varistors Doped with Rare Earth Oxides and Their Characterization by Impedance Spectroscopy

Crystals, 2020
ZnO-based ceramic varistors have shown excellent electrical and dielectric properties due to their characteristics microstructures represented by the arrangement of their grains and grain boundaries that allow the absorption and flow of energy when ...
J. Porcayo-Calderon, J.J. Ramos-Hernandez, C.D. Arrieta-Gonzalez, J.G. Chacon-Nava, J.G. Gonzalez-Rodriguez, E. Porcayo-Palafox, M. Sanchez-Carrillo, J.P. Flores-De los Rios, L. Martinez-Gomez   +8 more
doaj   +1 more source

Electrical properties of ZnO varistors prepared by direct mixing of constituent phases [PDF]

Science of Sintering, 2006
Varistor samples containing different amounts of constituent phases were prepared by direct mixing of constituent phases. Detailed electrical characterization was performed to explain the influence of minor phases (spinel and intergranular phases) on ...
Žunić M., Branković Z., Branković G.
doaj   +1 more source

The effects of Cu dopant on the microstructure and non-ohmic electrical properties of ZnO varistors

, 2011
The doping effects of Cu on the microstructure and non-ohmic electrical properties of ZnO varistors were studied. Addition of Cu2O can enhance the ZnO grain growth during sintering. The SEM and EDS results revealed that the added Cu mainly distributed in
Fan, Jiwei, Jiao, Zhiqiang, Zhang, Zhenguo, Xiao Peng Li, Liu, Xiangyang, Zhang, Wenjing, Ji Wei Fan, Zhi Qiang Jiao, Xiang Yang Liu, Wen Jing Zhang, Zhen Guo Zhang, Freer, Robert, Poonsuk Poosimma, Robert Freer, Li, Xiaopeng, Poosimma, Poonsuk   +15 more
core   +1 more source

Influence of spinel phase composition on ZnO varistors properties

, 1998
The method of directed synthesis of the constituent phases (DSCP) was applied to investigate the influence of spinel phase composition on characteristics of ZnO varistors.
Uskoković, D, Branković, Zorica, Karanović, Ljiljana C., Poleti, Dejan   +3 more
core   +1 more source

Study on the Influence Mechanism of Side Surface Treatment Technology for ZnO Varistors

International Journal of Ceramic Engineering &Science, Volume 8, Issue 6, November 2026.
This study compares three ZnO varistor side treatments: insulating varnish, high‐resistance layer, and in situ repair. The in situ repair medium achieves superior pore filling and current distribution, raising 2‐ms surge withstand capability to 950 A, but reduces voltage gradient and increases leakage current.
Zhengzheng Fu, Zongxi Zhang, Songhai Fan, Tao Cui, Donghui Luo, Fenglian Liu, Yue Yin, Pengfei Meng   +7 more
wiley   +1 more source

Nonlinear Conductive Materials for Adaptive Electric Overstress Control: Theory, Tailoring and Applications

High Voltage, Volume 11, Issue 5, Page 1482-1500, October 2026.
ABSTRACT Artificial intelligence computing, renewable energy integration and transportation electrification are driving electrical and electronic equipment towards higher power densities, higher voltage ratings and greater miniaturisation. Under these trends, insulation systems have become a key bottleneck for reliability and compactness.
Zhiwen Huang, Xianrui Jiang, Gang Sun, Juntong Zong, Ya Sun, Jun Hu, Jinliang He   +6 more
wiley   +1 more source

Nanostructured constituents of ZnO-based varistors prepared by mechanical attrition

, 1994
Nanostructured powders, with crystallite size of ZnO, spinel and γ-Bi2O3 phases below 100 nm, were obtained by the mechanical attrition of ZnO varistor powders prepared by method of directed synthesis of the constituent phases.
Branković, Zorica, Poleti, Dejan, Karanović, Ljiljana, Milošević, Olivera, Uskoković, Dragan   +4 more
core   +1 more source

Lightning Overvoltage Protection Technologies for High‐Speed Railway Traction Power Supply Systems: Current Status and Future Prospects

High Voltage, Volume 11, Issue 5, Page 1360-1375, October 2026.
ABSTRACT The traction power supply system of high‐speed railways is exposed to complex lightning environments over the long term. Overvoltage generated by direct lightning or induced lightning can propagate along the overhead contact line, traction substations, onboard high‐voltage system and mobile grounding system, thereby threatening equipment ...
Guangning Wu, Yihan Fan, Ye Cao, Xinbo Lv, Yujun Guo, Song Xiao, Huazhi Zhang, Jun Hu, Baoguo Wang, Guoqiang Gao   +9 more
wiley   +1 more source

Microstructural Characterization of ZnO Varistors.

Journal of the Japan Society of Powder and Powder Metallurgy, 1995
Two kinds of commercial ZnO system varistors were investigated with relevance to their microstructures. Particularly, face-to-face fracture surfaces were characterized in terms of secondary electron image and backscatterd electron image to clarify the existence of precipitates at the grain-to-grain interface.
Takeda, Shunji, Koumoto, Kunihito, Yanagida, Hiroaki   +2 more
openaire   +2 more sources

Study on temperature rise prediction of ZnO varistors under multiple lightning strikes based on BP neural network and microscopic

High Temperature Materials and Processes
ZnO varistors are widely used in the field of lightning protection. After being struck by lightning, ZnO varistors absorb heat, which can lead to temperature rise and even damage, posing a serious safety threat to electrical safety.
Li Chunying, Zhang Chunlong, Lv Qing
doaj   +1 more source