Graphitic electrode with protective coating

Details Graphitic electrode with protective coating Graphitic electrode with protective coating

1985-08-12

1988-06-07

Envall, Jr., Roy N.

Industrial electric heating furnaces

Arc furnace device

Electrode

H05B 706, H05B 708

Patent

active

047501871

ABSTRACT:
The protective coating consists of three layers. As alloying additives in the first and second layer or only in the second layer are used, nickel and iron or their oxides whereby the nickel content is from 0.05 to 0.95% and the iron content is, respectively, from 0.1 to 15% with regard to the total amount of aluminum. Both layers are submitted to heat treatment with surface density of the heat flow from 8 to 16.10.sup.6 W/m.sup.2. The third layer consists of aluminum with technical grade purity.
The thus described graphitic electrodes are used in arc furnaces.

REFERENCES:
patent: 3348929 (1967-10-01), Valtschev et al.
patent: 3476586 (1969-11-01), Valtschev et al.
patent: 3553010 (1971-01-01), Rubisch et al.
patent: 4252856 (1981-02-01), Sara
patent: 4383321 (1983-05-01), Schieber et al.
patent: 4530853 (1985-07-01), Lewallen et al.

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