Electric heating – Metal heating – By arc
Patent
1990-06-18
1992-04-07
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912148, 2191215, 21912136, 219119, B23K 900
Patent
active
051030721
ABSTRACT:
The present invention relates to a plasma torch intended for being submerged into a bath of molten metal, such as for example a steel melt. The torch comprises an outer electrode made from a non-consumable material and an inner electrode, where at least the outer electrode is made from a copper pipe having internal channels for circulation of a cooling medium, said copper pipe at least on the outside having a layer of refractory material.
The layer of refractory material has a thickness between 1 and 5 mm and is made from Al.sub.2 O.sub.3 or from ZrO.sub.2 stabilized with 5-25% by weight of MgO and/or Y.sub.2 O.sub.3 or oxides of other rare earth elements.
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Eikeland Inger J.
Poppe Per
Elkem Technology a/s
Paschall Mark H.
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