Abstract
In this paper we present a study concerning the influence of theelectrode gap on the erosion of a copper cathode under the sole action of anelectric arc in air at atmospheric pressure. The causes of the variations ofthe erosion rate with this parameter are studied. It is shown that, certainly,the variations of the erosion rates with the electrode gap should be imputedto two factors: the arc mobility which changes strongly with the electrode gapand a `supplementary' heating of the cathode surface due to interactions thatoccur at small electrode gap values between the cathode surface and the anodeplasma jets.
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