Results 211 to 220 of about 9,079 (268)
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Journal of Applied Physics, 1988
A composite varistor material containing silicon carbide, a conductor, and an insulator has been developed. The material has rubberlike flexibility and is easily formed. A higher leakage resistivity (∼1012 Ω cm) and greater nonlinearity (∼10) than for silicon carbide varistors permit the material to be used as a gapless surge suppressor.
F. A. Modine, H. M. Hyatt
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A composite varistor material containing silicon carbide, a conductor, and an insulator has been developed. The material has rubberlike flexibility and is easily formed. A higher leakage resistivity (∼1012 Ω cm) and greater nonlinearity (∼10) than for silicon carbide varistors permit the material to be used as a gapless surge suppressor.
F. A. Modine, H. M. Hyatt
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[1991 Proceedings] 6th Mediterranean Electrotechnical Conference, 2002
Two shapes of interdigitated planar varistors were made using thick-film technology on alumina substrates. These varistor were based on ZnO paste. The distance between varistor electrodes were changed from 0.2 to 1.91 mm, and the total length of the electrodes from 49 to 230 mm.
T.D. Grozdic +3 more
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Two shapes of interdigitated planar varistors were made using thick-film technology on alumina substrates. These varistor were based on ZnO paste. The distance between varistor electrodes were changed from 0.2 to 1.91 mm, and the total length of the electrodes from 49 to 230 mm.
T.D. Grozdic +3 more
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Degradation phenomena of ZnO varistors
Physica Status Solidi (a), 1981The dc degradation behaviour of ZnO varistors as a function of the variables current, temperature, and time is investigated. The degradation rate is phenomenologically presented by an equation reflecting the observed aging behaviour in dependence on the influencing variables.
W. Moldenhauer +4 more
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Hybrid Circuits, 1993
Various thick film varistor constructions were made and characterised: ‘sandwich’, ‘interdigitated’ and ‘segmented’ varistors. The varistor active layer thickness, the electrode surface value and shape were varied. The Ul characteristics of these varistors were compared mutually, and with the Ul characteristics of the smallest chip varistors.
O.S. Aleksić +3 more
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Various thick film varistor constructions were made and characterised: ‘sandwich’, ‘interdigitated’ and ‘segmented’ varistors. The varistor active layer thickness, the electrode surface value and shape were varied. The Ul characteristics of these varistors were compared mutually, and with the Ul characteristics of the smallest chip varistors.
O.S. Aleksić +3 more
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Journal of the American Ceramic Society, 1987
The varistor properties were examined in porous ZnO. The sample used contained no dopants such as Bi 2 O 3 or Pr 6 O 11 , which are usually considered to be useful in ...
Satoru Fujitsu +2 more
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The varistor properties were examined in porous ZnO. The sample used contained no dopants such as Bi 2 O 3 or Pr 6 O 11 , which are usually considered to be useful in ...
Satoru Fujitsu +2 more
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Integrated varistor-capacitor ceramics
ISAF '96. Proceedings of the Tenth IEEE International Symposium on Applications of Ferroelectrics, 2002There exists a continued trend of ceramic integration in electronic components. In the last decade inductor-capacitors, resistor-capacitors have all successfully undergone integration into surface mount components. There exists a need to integrate varistors and capacitors to suppress high frequency transient voltage surges beyond /spl ges/0.5 ns.
F.J. Toal, J.P. Dougherty, C.A. Randall
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Microchemistry of ZnO Varistors
Proceedings, annual meeting, Electron Microscopy Society of America, 1992ZnO varistors are made by mixing semiconducting ZnO powder with powders of other metal oxides e.g. Bi2O3, Sb2O3, CoO, MnO2, NiO, Cr2O3, SiO2 etc., followed by conventional pressing and sintering. The non-linear I-V characteristics of ZnO varistors result from the unique properties that the grain boundaries acquire as a result of dopant distribution ...
K. K. Soni +4 more
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IEEE Electrical Insulation Magazine, 1989
An overview is given of zinc oxide varistors, which are made of semiconducting ceramics with highly nonohmic current-voltage characteristics, which originate at the grain boundaries. These varistors are widely utilized to protect electric power lines and electronic components against dangerous voltage surges.
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An overview is given of zinc oxide varistors, which are made of semiconducting ceramics with highly nonohmic current-voltage characteristics, which originate at the grain boundaries. These varistors are widely utilized to protect electric power lines and electronic components against dangerous voltage surges.
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Polarization currents in varistors
Journal of Applied Physics, 1990The time, voltage, and temperature dependencies of transient polarization currents are reported for two types of varistors (i.e., ZnO and a SiC composite). The current transients exhibit a power-law time response to a step change in voltage (i.e., I≊I0/tm, where m is slightly less than unity) that persists over a time scale exceeding 10−8–104 s.
F. A. Modine +4 more
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[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials, 2002
The frequency characteristics of the capacity and the dissipation factor of a ceramic ring varistor have been measured in the range from 10 kHz to 1 MHz. From the measurements, the equivalent circuit was determined, considering the internal structure of the ceramic ring varistor.
M. Suzuki +3 more
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The frequency characteristics of the capacity and the dissipation factor of a ceramic ring varistor have been measured in the range from 10 kHz to 1 MHz. From the measurements, the equivalent circuit was determined, considering the internal structure of the ceramic ring varistor.
M. Suzuki +3 more
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