Results 81 to 90 of about 2,022 (170)

دراسة التركيب النسيجي لأجسام سيراميكية من أكسيدي الزنك و السيريوم ((Microstructure study of Ce-doped – Ceramics containing Zinc and Cerium oxides))

مجلة المختار للعلوم, 2004
للسيراميك استخدامات عديدة علي نطاق واسع  في مجال الكهرباء (الالكترونيات). ويتسع مدى هـذه  الاستخدامات  ليشمل الوقاية من خطر الجهد باستخدام الفارستور (Varistors) إلى مقاومات الفارستور (Varistors) ذات  درجة الحرارة الموجبة إلى العوازل السيراميكية ...
D. E. Ibrahim, Osama Desouky
doaj   +1 more source

Electrical characterization and modeling of varistors

In this work, a generalized experimental methodology was developed for the electrical characterization of metal oxide varistors and for analyzing their behavior under DC and AC voltages of various frequencies (45 Hz – 1 kHz) and under electromagnetic ...
Staikos, Evangelos, Στάικος, Ευάγγελος   +1 more
core   +1 more source

Low-temperature Sintering of Zinc Oxide Varistors

, 1990
High-field varistors in the system ZnO-CoO-MnO-Bi2O3 were fabricated using powders prepared by a previously developed coprecipitation process. Following calcination, the powders were compacted and densified by conventional pressureless sintering at ...
Voigt, James A., Tuttle, Bruce A., De Jonghe, L. C., Rahaman, M. N.   +3 more
core   +1 more source

Preparation of ZnO-based varistors by the sol-gel technique

, 1994
ZnO-based varistors consisting of 96 mol% ZnO and 4 mol% additive oxides (Bi2O3, Sb2O3, NiO, Co2O3, MnO and Cr2O3) have been prepared. Four different procedures have been applied to obtain the starting powder mixture.
Österlund, Ragnar, Ekstrand, Åsa,, Merkelbach, Paul, Westin, Gunnar, Nygren, Mats   +4 more
core   +1 more source

Study of the Effect of WO3 and Bi2O3 on the Microstructure and Electrical Properties of A TiO2 based Varistor

Journal of Mechanical Engineering and Sciences, 2014
Titanium dioxide (TiO2) varistors doped with tungsten oxide (WO3) and bismuth oxide (Bi2O3) were investigated. The microstructure and electrical characterization were studied, where the effects of different concentrations of WO3 and a fixed amount of ...
Z. Kothandapani, S. Begum, I. Ahmad, I. R. Daud, S. Gholizadeh   +4 more
doaj   +1 more source

INVESTIGATION OF EXPLOSION SAFETY OF DC POLYMER SURGE ARRESTERS 3.3 KV FOR TRACTION NETWORK OF RAILWAY TRANSPORT

Electrical engineering & Electromechanics, 2019
In the testing laboratories of Ukraine, there is no high-voltage equipment of the necessary energy for testing surge arresters for explosion safety, which does not allow to estimate this indicator at the stage of development of prototypes.
Yu. N. Shumilov, V. I. Bondarenko
doaj   +1 more source

Microwave Sintering Technology for the Production of Metal Oxide Varistors

, 1990
A microwave sintering technology has been developed for the production of metal oxide varistors. The electrical properties (leakage current and non-linearity coefficient) of the microwave sintered devices were found to be comparable to those obtained for
A. Pant, R.T. Holt, R. Sood, G. McMahon, A. Ahmas   +4 more
core   +1 more source

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

Materials (Basel), 2023
Lungu MV.
europepmc   +1 more source

Estudio de la región rica en Bi₂O₃ en el sistema binario ZnO-Bi₂O₃

Boletín de la Sociedad Española de Cerámica y Vidrio, 2004
Ceramic materials based in the ZnO- Bi2O3 system have their principal application as varistors. The binary system ZnO-Bi2O3 is specially relevant to the formation of the microstructure responsable of the varistor behaviour.
Caballero, A. C., Fernández, J. F., Peiteado, M., de la Rubia, M. A.   +3 more
doaj  

Effect of MnO2${ ext{MnO}}_{2}$ doping on AC aging characteristics of varistor in arrester

International Journal of Ceramic Engineering & Science
As the core component of lightning arrester, the performance of ZnO varistor directly affects the protection level of lightning arrester. Under the action of long‐term AC voltage, the varistors are prone to AC aging, which leads to the deterioration of ...
Zhengzheng Fu, Zongxi Zhang, Songhai Fan, Tao Cui, Donghui Luo, Yiping Jiang, Pengfei Meng, Jingke Guo, Yue Yin   +8 more
doaj   +1 more source