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Cathodic erosion in the vacuum arc

The cathodic erosion of Cu, Cr and Cd has been measured at DC currents below 2000 A, and was found to be, to a first approximation, dependent on the total charge passed through the arc only. The observed erosion rates were 76, 22 and 400 μg C−1 for Cu, Cr and Cd respectively. Measurements on different kinds of copper indicate that the crystal grain size is of influence on the erosion rate. Of the total energy dissipated in the arc, about 25% is transferred to the cathode and 75% is divided between the losses to the surroundings and input to the anode. An attempt is made to correlate the erosion rate to one or more of the material properties of the metal.