Results 21 to 30 of about 156,786 (215)

Boundary breakdown time of ZnO varistors under nanosecond pulse current

AIP Advances, 2019
Conductive properties of zinc oxide (ZnO) varistor ceramics depend on the boundary barrier structure. By using the photoconductivity switches (PCSS) technology, the boundary breakdown characteristics of ZnO varistors for nanosecond electric pulse ...
Guangyong Xie, Mengyuan Wu, Wei Shi
doaj   +2 more sources

Micro-Degradation Characteristics and Mechanism of ZnO Varistors under Multi-Pulse Lightning Strike

Energies, 2020
In view of the problem that ZnO varistors are often subjected to thermal breakdown and deterioration due to lightning strikes in low-voltage power distribution systems, this article used a 8/20 µs multi-pulse surge current with a pulse time interval of ...
Chunlong Zhang, Hongyan Xing, Chunying Li, Ran Cai, Dongbo Lv   +4 more
doaj   +2 more sources

Analysis of the failure mechanism of ZnO varistors influenced by high‐resistance media based on multi‐field coupling simulation

High Voltage
This study focuses on the distribution of high‐resistance media (pores and spinels) within ZnO varistors and explores the mechanical and electrical failure mechanisms of varistors under different pulse actions.
Pengfei Meng, Yue Yin, Lei Wang, Jingke Guo, Zerui Li, Kai Zhou, Guangya Zhu, Yefei Xu   +7 more
doaj   +2 more sources

Computer Simulation of ZnO Varistors Failures [PDF]

MRS Proceedings, 1997
ABSTRACTA simple thermo-mechanical model is applied to evaluate the influence of the nonuni-formity of ZnO varistor disks used in surge arresters on their energy handling capability. By solving heat transfer equations for a varistor disk with nonuniform electrical properties, we compute the time dependence of the temperature profile and the ...
Bartkowiak, M., Mahan, G. D., Comber, M. G., Alim, M. A.   +3 more
openaire   +3 more sources

Effects of Dopants and Processing Parameters on the Properties of ZnO-V₂O₅-Based Varistors Prepared by Powder Metallurgy: A Review. [PDF]

Materials (Basel), 2023
This article reviews the progress in developing ZnO-V2O5-based metal oxide varistors (MOVs) using powder metallurgy (PM) techniques. The aim is to create new, advanced ceramic materials for MOVs with comparable or superior functional properties to ZnO ...
Lungu MV.
europepmc   +2 more sources

Strain-Induced Redistribution of Point Defects in ZnO Nanoparticles. [PDF]

Small Sci
Powder compaction generates local strain effects in ZnO nanoparticles. This alters the abundance of intrinsic point defects and impacts the semiconductor's electronic structure. Such changes were analyzed by a combination of spectroscopy and density functional theory calculations and emphasize the importance of strain effects in the design and ...
Aicher K, Berger T, Litovoilis A, Aschauer U, Diwald O.   +4 more
europepmc   +2 more sources

Comparative Studies on Degradation of Varistors Subjected to Operation in Surge Arresters and Surge Arrester Counters [PDF]

Archives of Metallurgy and Materials, 2020
The paper presents results of investigation of microstructure and micro-hardness for material of ZnO varistors applied to 110 kV surge arrester and surge arrester counter.
P. Papliński, J. Wańkowicz, H. Śmietanka, P. Ranachowski, Z. Ranachowski, S. Kudela Jr, M. Aleksiejuk   +6 more
doaj   +1 more source

Effect of Zn7Sb2O12 pre-synthesis on microstructure and properties of ZnO varistor ceramics

AIP Advances, 2022
In this work, the Zn7Sb2O12 spinel phase is pre-synthesized at 980, 1000, 1020, 1040, and 1060 °C by mixing ZnO and Sb2O3 in a molar ratio of 7:1. ZnO varistors are prepared by replacing Sb2O3 with the Zn7Sb2O12 spinel phase.
Fei Zhu, Chang Liu, Jianlin Li, Deyi Zheng, Chi Pang, Zihao Fei   +5 more
doaj   +1 more source

Processing parameters for ZnO-based thick film varistors obtained by screen printing

Boletín de la Sociedad Española de Cerámica y Vidrio, 2006
Thick film varistors based on the ZnO-Bi2O3-Sb2O3 system have been prepared by screen printing on dense alumina substrates. Different processing parameters like the paste viscosity, burn out and sintering cycles, green and sintered thickness, have been ...
de la Rubia, M. A., Peiteado, M., Fernández, J. F., Caballero, A. C., de Frutos, J., Holc, J., Drnovsek, S., Kuscer, D., Macek, S., Kosec, M.   +9 more
doaj   +1 more source

High performance ZnO varistors prepared from nanocrystalline precursors for miniaturised electronic devices [PDF]

, 2008
An industrially viable solution-based processing route using minimal amounts of solvent has been used to prepare bulk quantity nanopowders (average particle size 15 3 nm) for the fabrication of ZnO varistors. The xerogels, calcined powders and sintered
Raghavendra, Ramesh, Pillai, Suresh C., Ramesh, Raghavendra, Kelly, John M., McCormack, Declan, McCormack, Declan E., Kelly, John, Pillai, Suresh   +7 more
core   +4 more sources