Results 21 to 30 of about 477 (182)

Varistores à base de SnO2: estado da arte e perspectivas [PDF]

Cerâmica, 2000
Este trabalho descreve a história dos varistores à base de SnO2. Nele são apresentadas as principais características deste novo sistema varistor e uma comparação direta com o sistema tradicional à base de ZnO, estabelecendo as vantagens e desvantagens. O
P. R. Bueno, M. M. Oliveira, M. R. Cassia-Santos, E. Longo, S. M. Tebcherani, J. A. Varela   +5 more
doaj   +1 more source

Investigation on the Physical Properties of Varistors According to Temperature

IEEE Access, 2022
This study aims to determine the basic physical properties of varistor, which is a protective element in a surge protection device (SPD) used to prevent damage to electric and electronic equipment due to lightning.
Ahran Min, Sin-Dong Kang, Jae-Ho Kim
doaj   +1 more source

Synthesis of ZnO based nanopowders via a non-hydrolytic sol gel technique and their densification behaviour and varistor properties [PDF]

Processing and Application of Ceramics, 2010
Hexagonal nanocrystalline varistor grade ZnO particles with size 50 nm and the specific surface area of 28 m2/g have been prepared by non-aqueous gelation technique involving diethylene glycol and triethanolamine.
Shereef Anas, Poothayil Mukundan, Ayyappan M. Sanoj, Viswanathan R. Mangalaraja, Solaiappan Ananthakumar   +4 more
doaj  

Control of Varistor Voltage by Grain-size Control of Bi-added ZnO Varistors

IOP Conference Series: Materials Science and Engineering, 2011
Relationship between the grain size of ZnO and the amounts of Bi and Sb for Bi-Ba-Sb-Co-Mn-added ZnO was investigated. The amount of Bi at which the grain size of ZnO became the maximum shifted to the notably larger one by adding small amount of Sb such as 0.01 mol%.
Fukumori, Ai, Kubota, Atsuko, Sato, Yuuki, Yoshikado, Shinzo   +3 more
openaire   +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

Enhanced dielectric response and non-Ohmic properties of Ge-doped CaTiO3/CaCu3Ti4O12

Journal of Asian Ceramic Societies, 2022
We present a method for increasing the dielectric constant of CaTiO3/CaCu3Ti4O12 (CTO/CCTO) composites and retaining a low-loss tangent (tanδ) by doping with Ge dopant.
Jirata Prachamon, Jakkree Boonlakhorn, Narong Chanlek, Nutthakritta Phromviyo, Viyada Harnchana, Pornjuk Srepusharawoot, Ekaphan Swatsitang, Prasit Thongbai   +7 more
doaj   +1 more source