Results 21 to 30 of about 1,546 (174)

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

Electronic properties of SnO2-based ceramics with double function of varistor and humidity sensor

, 2009
This is the post-print version of the article. The official published version can be obtained from the link below - Copyright @ 2010 AD-Tech.Tin dioxide based varistor ceramics SnO2-Co3O4-Nb2O5-Cr2O3-xCuO (x=0; 0.05; 0.1 and 0.5) were made and their ...
Bulpett, R, Sandoval-García, AP, Jones, Benjamin, Jimenez-Santana, G, Sandoval-García, A.P., Jones, BJ, Gaponov, A.V., Glot, AB, Gaponov, AV, Glot, A.B.   +9 more
core   +1 more source

Influence of Partial Discharges on ZnO Varistors [PDF]

, 2008
The varistors used in HV overvoltage limiters are constantly exposed to operating voltage and environmental hazards and also to transient hazards associated with, among others, overvoltages or pollution.
Jaroszewski, M
core   +1 more source

The Degradation of Epoxy Resin-Coated ZnO Varistors at Elevated Temperatures and Ambient Humidity Conditions

Active and Passive Electronic Components, 2003
The degradation of the epoxy resin-coated commercial ZnO varistors at elevated temperatures and ambient humid conditions has been investigated experimentally.
Jianying Li, Shengtao Li, M. A. Alim, G. Chen   +3 more
doaj   +1 more source

Study on the Stability of the Electrical Connection of High-Temperature Pressure Sensor Based on the Piezoresistive Effect of P-Type SiC

Micromachines, 2021
In this study, a preparation method for the high-temperature pressure sensor based on the piezoresistive effect of p-type SiC is presented. The varistor with a positive trapezoidal shape was designed and etched innovatively to improve the contact ...
Yongwei Li, Ting Liang, Cheng Lei, Qiang Li, Zhiqiang Li, Abdul Ghaffar, Jijun Xiong   +6 more
doaj   +1 more source

Caracterização elétrica de blocos varistores à base de SnO2 Electrical characteristics of SnO2-based varistor blocks

Cerâmica, 2012
Neste trabalho foi realizado um estudo das propriedades elétricas de blocos varistores à base de SnO2. Foram avaliadas a não linearidade destas cerâmicas por meio da caracterização tensão-corrente, bem como a altura, largura e os portadores de cargas por
R. L. Brito, P. A. P. Pessôa, J. S. Vasconcelos, L. P. S. dos Santos, J. H. G. Rangel, E. Longo, V. C. de Sousa, M. A. Ramirez, M. M. Oliveira   +8 more
doaj   +1 more source

Microstructure and Degree of Degradation of ZnO Varistors in Surge Arresters Due to Operation [PDF]

Archives of Metallurgy and Materials, 2018
The paper presents the test results for the microstructure of ZnO varistors comprising high voltage gapless surge arresters. The tests were performed on varistors produced in different periods and by various manufacturers.
P. Papliński, J. Wańkowicz, P. Ranachowski, Z. Ranachowski   +3 more
doaj   +1 more source

Influência de dopantes doadores na degradação do varistor à base de SnO2 e o efeito do oxigênio pós-degradação nfluence of donor dopants on the degradation of SnO2 -based varistors and the effect of the oxygen post-degradation

Cerâmica, 2006
A degradação elétrica de varistores à base de SnO2 foi estudada e verificou-se que na temperatura de 220 ºC ocorreu a degradação do material. Suas características foram recuperadas quando tratadas em atmosfera de O2, o que mostra que esta atmosfera é ...
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

Development of SNO2 based varistors -electrical behavior and pulse degradation comparatively to ZNO varistors

, 2017
This work presents the most relevant aspects of the SNO2 based varistors technology and a comparative study of its non linear behavior in relation to ZnO (modified Matsuoka system) varistors.
Longo, E. [UNESP], Bassi, W., Varela, J. A. [UNESP], Bueno, P. R. [UNESP], Ramirez, M. A. [UNESP]   +4 more
core   +1 more source

Current localization, non-uniform heating, and failures of ZnO varistors [PDF]

, 1997
Metal oxide varistors have highly nonlinear electrical characteristics and are widely used as devices for over-voltage protection. Varistor applications range from the use of small varistors to protect delicate electronic components to the use of much ...
Bartkowiak, M., M. Bartkowiak
core   +1 more source