Results 21 to 30 of about 280 (129)
Efeito das correntes de impulso de curta duração na degradação e na capacidade de absorção de energia de varistores a ZnO [PDF]
, 2023 Installed surge arresters are subjected to different types of overvoltages, and the varistors, which are their active element, must be able to not only absorb the energy from these overvoltages, but also present degradation levels that do not compromise ...
NOGUEIRA, Thiago Arantes
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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 +6 more
doaj +1 more source
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 +3 more
openaire +1 more source
A formação e o estágio atual do grupo de materiais cerâmicos (GPMC) da UEPG
Cerâmica, 1999 Dentro da área de materiais, a Universidade Estadual de Ponta Grossa possui um Centro Interdisciplinar de Pesquisas em Materiais, do qual o grupo de materiais cerâmicos faz parte.
S. A. Pianaro +3 more
doaj +1 more source
European Journal of Applied Mathematics, 2016 A three-dimensional model of the varistor device is proposed. The thermal and electric conductivity of the material are taken to depend, in addition to the electric potential, on the temperature. Two theorems of existence and uniqueness of solutions for the boundary-value problem which determine the potential and the temperature inside the device are ...
openaire +1 more source
Influência do uso da casca do ovo beneficiada como aditivo em varistores à base de ZnO [PDF]
, 2023 Varistors are semiconductor devices that have non-linear characteristics, acting as protection devices against voltage transients. There are several types of varistors, but ZnO ones stand out due to their better energy absorption capacity, better ...
Silva, Jussiê Ubaldo da
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Advances in the synthesis of ZnO nanomaterials for varistor devices [PDF]
Journal of Materials Chemistry C, 2013 ZnO based varistors are widely used for overvoltage protection in many electrical and electronic circuits, at voltages ranging from a few to over a million volts. By careful control of the microstructure, through nano-structuring by chemical routes, it should be possible to produce varistors with high breakdown voltage (Vc), as this is proportional to ...
Pillai, Suresh +3 more
openaire +3 more sources
, 2006 Se reporta un estudio comparativo de productos existentes en el mercado, para definir criterios con respecto a los cuales se puedan comparar muestras obtenidas en investigación de varistores o definir estándares de control de calidad para consumidores ...
Giraldo Tobón, Eugenio +3 more
core +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. +3 more
doaj
Desenvolvimento de subsídios para aplicação em testes de avaliação de para-raios de ZnO [PDF]
, 2012 Dissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2011Este trabalho apresenta como proposta principal verificar as influências externas, como a ...
Videira, André Gomes
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