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Carbon electrode, in particular a graphite electrode for producing steel
| Details |
Inventors: Schieber, Franz; Mayer, Dieter;
Assignee: C. Conradty Nurnberg GmbH & Co KG (Pegnitz, DE)
Primary Examiner: Envall, Jr.; Roy N.
Assistant Examiner:
Attorney, Agent or Firm: Gifford, Van Ophem, Sheridan and Sprinkle
A carbon electrode, in particular a graphite electrode for producing steel which can be used for electric arc melting furnaces of conventional design. The electrode comprises a metal-containing protective layer, and fusion of the contact jaws of the electrode holder with the metal-containing protective layer is avoided by covering at least part of the electrode surface by a graphite-containing material. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE PRESENT INVENTION With reference now to FIG.
1, the present invention is thereshown and comprises the electrodes 1, which are held by contact jaws 2 that are hydraulically urged against the electrode surface, and which extend in a known manner through the cover 3 of the electric-arc furnace 4.
The protective coating of the electrodes in such a furnace is exposed to very severe operating conditions because when oxygen is blown in, slag splatters up to the furnace cover and covers the electrode surface.
Despite a good sealing of the electrodes as they pass through the cover with the aid of known sealing devices, a certain contamination of the electrode surface in the region of the contact jaws 2 can frequently not be entirely prevented.
Due to the fact that the graphite-containing material described below is applied onto the metal-containing protective coating in a layer thickness of about 0.
1 to 2.
0 mm and is somewhat ductile, the hydraulic contact jaws, which consist of copper, can urge the dirt particles in the region of their contact surfaces into the graphite-containing material, with disadvantageous effects on the transfer resistance between jaw and electrode thus being avoided.
There is no welding between jaws and graphite-containing material, so that the jaws may consist of copper, and the release of the contact jaws from the electrode surface for the purpose of resetting the electrode is unrestricted.
As shown in FIG.
2, the electrode 1 according to the present invention is provided with a core 5 of carbon or graphite, covered by a first metal-containing coating 6 and a second protective coating 7 of graphite-containing material disposed on the first coating 6.
The second coating 7 covers at least the area on the electrode connectable to the jaws 2 of an electrode holder.
Thus fusion of the jaws 2 to the electrode 1 is prevented.
ILLUSTRATIVE EMBODIMENT The preferred graphite-containing material comprises a mixture of about 700 parts by weight of Ceylon graphite powder, having a particle size of less than 63
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Telecommunications 
