Method of forming an oxide ceramic electrode in a transferred pl

Details Method of forming an oxide ceramic electrode in a transferred pl Method of forming an oxide ceramic electrode in a transferred pl

1999-10-27

2000-07-04

Paschall, Mark

Electric heating

Metal heating

By arc

21912136, 21912152, 21912148, 428329, 501126, B23K 1000

Patent

active

060842016

ABSTRACT:
A method is provided for forming a molten oxide ceramic electrode for a plasma arc ignited between first and second electrodes within a plasma arc chamber, wherein the conductivity the oxide ceramic is a function of temperature alone. Following ignition of the plasma arc, a mixture is formed of a small quantity of molten oxide ceramic and a sufficiently high concentration of a volatile contaminant to render the mixture electrically conductive. The plasma arc is then transferred from one of the electrodes to the mixture. The temperature of the mixture is raised sufficiently to render the oxide ceramic electrically conductive. Finally, the volatile contaminant is progressively removed from the mixture so as to leave an electrode composed of substantially pure molten oxide ceramic.

REFERENCES:
patent: 5069771 (1991-12-01), Nguyen et al.
patent: 5110774 (1992-05-01), Ogura

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