Results 311 to 320 of about 117,127 (343)

Role of the metallic phase arc discharge on arc erosion in Ag contacts

IEEE Transactions on Components, Hybrids, and Manufacturing Technology, 1990
The influence of the metallic-phase arc discharge on contact performance was studied for breaking Ag contacts. Measured parameters were whole arc duration (metallic-phase plus gaseous-phase arc duration), metallic-phase arc duration, contact resistance, bridge energy, and electrode material mass change.
H. Sone, T. Takagi
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Erosion structures on cathodes arced in vacuum

Journal of Physics D: Applied Physics, 1979
An analysis is presented of the structural changes which occur on cathode surfaces arced in vacuum. Cadmium, copper, molybdenum and tungsten cathodes carrying currents up to a few hundred amps showed a variety of erosion patterns which have been interpreted as representing a number of stages with different degrees of erosion.
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Erosion of metal cathodes by arcs and breakdowns in vacuum

Journal of Physics D: Applied Physics, 1976
The formation of erosion structures on metal cathodes by arcs and breakdown in UHV was studied experimentally by FEM and SEM and theoretically by a simple model. Nanosecond high-voltage breakdowns and quasi-stationary arcs had analogous effects on the production of surface craters. The existence of sharp micropoints could be proved directly by SEM.
E Hantzsche, B Juttner, V F Puchkarov, W Rohrbeck, H Wolff   +4 more
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Cathode erosion rates in vacuum-arc discharges

IEEE Transactions on Plasma Science, 1990
Erosion rates of metal-vapor vacuum-arc cathode materials have been measured for a number of different cathode elements. The measured rates are compared with the rates predicted by a simple estimate based on the known ion generation rates. The agreement is good for the more refractory metals.
I.G. Brown, H. Shiraishi
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Electrode erosion and gas evolution of vacuum arcs

IEEE Transactions on Communication and Electronics, 1963
The characteristics of the evolution of gas from metals in vacuum arcs are presented. New materials have been developed having ungettered gaseous impurity concentrations of the order of 1 part in 109. Loss of vacuum in a vacuum switch by desorption and by diffusion of helium and other gases is negligible when good techniques are employed.
J. D. Cobine, T. A. Vanderslice
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The effect of arc velocity on cold electrode erosion

Physics of Plasmas, 2004
Results of experimental investigations of copper cathode erosion in a magnetically driven arc versus arc rotation velocity v are presented. The erosion rate measurements were carried out with the arc burning in air, for magnetic induction values B in the range of 0.005–0.386 T, axial air gas velocity of 7.65 ms−1, and current of 292 A. It is shown that
Alexei M. Essiptchouk, A. Marotta, Leonid I. Sharakhovsky   +2 more
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Make arc erosion and welding in the automotive area

IEEE Transactions on Components and Packaging Technologies, 2000
A make arc has been investigated using a new testing apparatus. This apparatus which includes a piezo-translator, enables controlled bouncing to be studied at make under mechanical conditions similar to those encountered in automotive relays. Material transfer and welding tendency of silver, silver alloys and silver metal oxide contact materials have ...
L. Morin, N.B. Jeman, D. Jeannot
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Oxide films on arc cathodes and their emission and erosion

Journal of Physics D: Applied Physics, 1975
Evidence is discussed which suggests that there are significant differences between the processes occurring when the films are 10 nm thick. For the former, electron emission can occur by tunnelling at an average electric field of about 109 V m-1 whereas for the latter some evidence suggests that emission occurs when conducting filaments are ...
A E Guile, A H Hitchcock
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Comparison Of Arc Erosion Coefficients

2020
The problem of nonunified approaches to giving arc erosion ratios is addressed for the application of molded case circuit breakers (MCCBs) in the range 6.5-10 kA. Charge, Joule’s integral and arc energy are compared as possible quantities to use for ratios of mass loss.
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Thermocapillary mechanism of contact erosion during arcing

Thirty-Sixth IEEE Conference on Electrical Contacts, and the Fifteenth International Conference on Electrical Contacts, 2002
The results of theoretical investigations of the interaction of an electrical arc with a contact surface during contact separation are investigated. Two stages of this process, bridging and arcing, are considered. A mathematical model of the first stage, describing the phenomena of appearance, evolution, and rupture of the contact bridge, takes into ...
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