Results 31 to 40 of about 479 (183)

Effect of sintering time on microstructure and electrical properties of varistor ceramics ZnO-CoO-SLS glass [PDF]

Science of Sintering, 2021
The influence of sintering time on the microstructure and electrical properties of ZnO-CoO-SLS (soda lime silica) glass varistor based ceramics has been investigated.
Ismail Nur Quratul Aini, Sa’at Nor Kamilah, Zaid Mohd Hafiz Mohd   +2 more
doaj   +1 more source

Análisis Matemático de la Supresión de Impulsos Tipo Atmosférico en Sistemas de Distribución

Ingenio, 2021
Se realizó el estudio y análisis de la supresión de impulsos tipo atmosférico al pararrayo de un Sistema de Distribución Eléctrica,  basado en la comparación de resultados teóricos desarrollados con el software Matlab – Simulink y los experimentales ...
Josue Quimiz, Nathalie Guerra, Klever Carrión, David Cárdenas, Carlos Chávez   +4 more
doaj   +1 more source

Ultrahigh voltage-gradient ZnO-based varistor ceramics via hybrid cold sintering process/spark plasma sintering and post-annealing process

Journal of Advanced Ceramics
A high voltage gradient (Vg) of ZnO-based varistor ceramics is critical for realizing miniaturized and lightweight overvoltage protection devices. However, improving Vg of ZnO-based varistor ceramics through conventional high-temperature sintering ...
Shenglin Kang, Xuetong Zhao, Qi Wang, Jie Liang, Jing Guo, Xilin Wang, Guilai Yin, Lijun Yang, Ruijin Liao   +8 more
doaj   +1 more source

Microstructure and Nonohmic Properties of SnO2-Ta2O5-ZnO System Doped with ZrO2

The Scientific World Journal, 2014
The microstructure and nonohmic properties of SnO2-Ta2O5-ZnO varistor system doped with different amounts of ZrO2 (0–2.0 mol%) were investigated. The proposed samples were sintered at 1400°C for 2 h with conventional ceramic processing method.
Xiuli Fu, Feng Jiang, Ruichao Gao, Zhijian Peng   +3 more
doaj   +1 more source

Revisão: efeito dos metais doadores nas propriedades elétricas e microestruturais dos varistores cerâmicos à base de SnO2 Review: effect of donor metals on the electrical and microstructural properties of SnO2-based ceramic varistors

Cerâmica, 2008
O estudo da adição de dopantes trivalentes é uma das principais pesquisas na área de varistores. Vários autores têm buscado entender os efeitos destes dopantes nas propriedades elétricas e microestruturais destas cerâmicas eletrônicas.
M. M. Oliveira, J. H. G. Rangel, V. C. de Sousa, E. Longo, R. N. R. Filho   +4 more
doaj   +1 more source

Effect of Cr2O3 on properties of ZnO-Bi2O3 based high-voltage varistor ceramics

Cailiao gongcheng
ZnO-Bi2O3-Co2O3-NiO-Mn3O4-SiO2-Cr2O3 varistor ceramics were prepared by solid-phase sintering method.The effects of different doping amounts of Cr2O3 on the microstructure and electrical properties of ZnO varistor ceramics were investigated, and the ...
GUI Yanghai, TU Yuansheng, TIAN Kuan, GUO Huishi, HUANG Hai, ZHANG Xinhua   +5 more
doaj   +1 more source

Study of the Electrophysical Properties of Composite Varistors Based on Zinc Oxide and Polymer (Polyaniline)

International Journal of Polymer Science, 2010
In this experimental work, current-voltage characteristics of composite varisrors prepared on the base of zinc oxide with different weight percentages of polyaniline and temperature dependence of the samples characteristics have been studied.
Sajedeh Mohammadi Aref, Hassan Bidadi, Shamestan Hasanli   +2 more
doaj   +1 more source

Efeito do Pr2O3 nas propriedades elétricas de varistores à base de SnO2 [PDF]

Cerâmica, 2003
A proposta deste trabalho foi o estudo e a obtenção de uma cerâmica densa à base de SnO2 dopada com CoO, Ta2O5 e diferentes concentrações de Pr2O3. Os sistemas apresentaram elevados valores de densidade relativa, e propriedades não ôhmicas.
L. G .P. Simões, M. O. Orlandi, A. L. Araujo, M. R. D. Bomio, E. R. Leite, E. Longo, J. A. Varela   +6 more
doaj   +1 more source

Aging Effects on PTCR Ceramics: SEM and C‐AFM Analysis of Electrical Conductivity and Domain Structures

International Journal of Applied Ceramic Technology, Volume 23, Issue 4, August 2026.
ABSTRACT This study examines the impact of aging on the electrical and structural properties of positive temperature coefficient of resistance (PTCR) ceramics. The presented study introduces a correlative scanning electron microscopy (SEM)/conductive atomic force microscopy (C‐AFM) approach enabling repeated, site‐specific characterization of ...
Kryštof Koller, Filip Ulč, Patrik Sokola, Veronika Hegrová, Petr Ptáček   +4 more
wiley   +1 more source

Desenvolvimento de varistores à base de SnO2 para aplicação em redes de alta tensão Development of SnO2-based varistors for high voltage application

Cerâmica, 2006
Varistores à base de SnO2 foram preparados pelo processo convencional de mistura de óxidos. As amostras foram sinterizadas a 1250 °C por 2 h. Os difratogramas obtidos por difração de raios X e as análises por microscopia eletrônica de varredura ...
M. M. Oliveira, J. H. G. Rangel, V. C. de Sousa, E. R. Leite, E. Longo, P. R. Bueno, J. A. Varela   +6 more
doaj   +1 more source