Summary
Two years of furnace operation with the use of copper-clad carbon electrodes has shown that for this particular furnace, copper-clad carbon electrodes have been a success.
The use of copper-clad carbon electrodes for other furnaces would depend entirely upon each individual set of circumstances as well as whether an electrode of a higher current-carrying capacity is needed.
Another application of copper-clad carbon electrodes on phosphorus furnaces would be to reduce oxidation of electrodes where the distance between the roof of the furnace and the holder is large.
Apparently what makes copper-clad carbon electrodes useful is that a good percentage of the current is transmitted into the furnace through the skin coat of copper.
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Holtgrewe, E.A. Copper-clad carbon electrodes on a phosphorus furnace. JOM 16, 1017–1020 (1964). https://doi.org/10.1007/BF03378320
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DOI: https://doi.org/10.1007/BF03378320