Title :
Influence of the material nature (Ag, Cu, Al, W, C) on the arc root characteristics at the cathode
Author :
Abbaoui, M. ; Lefort, A. ; Clain, S.
Author_Institution :
LAEPT, CNRS - Blaise Pascal University, 24, avenue des Landais, F63 177 AUBIERE Cedex
fDate :
Sept. 27 2004-Oct. 1 2004
Abstract :
This paper describes a thermo physical phenomena analysis about a silver, copper, aluminium, iron, tungsten or graphite electrode submitted to a high density energy flux. The thermal flux necessary to create a cathode spot is about 1.1012Wm-2. For the studied metals and for values lower than 1.1012 Wm-2, the liquid phase does not appears and the entire energy coming at the cathode surface diffuses in the electrode. For values upper than 5.1012 Wm-2 a large part of the energy is used for the vaporization and the electrode vaporized length depends of the material nature. The gap situated between the two extreme values 1.1011 W m-2 and 1.1013 Wm-2 corresponds to the cathode spot with liquid and vapour phases.
Keywords :
Aluminum; Cathodes; Conducting materials; Copper; Current density; Electrodes; Optical materials; Silver; Solids; Thermal conductivity;
Conference_Titel :
Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV. XXIst International Symposium on
Conference_Location :
Yalta, Crimea
Print_ISBN :
0-7803-8461-X
DOI :
10.1109/DEIV.2004.1418648