C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
204/96.36
C23C 4/00 (2006.01)
Patent
CA 1083525
A METHOD OF TREATING ELECTRODES INTENDED FOR OPERATION IN ARGON AS CATHODES OF AN ELECTRIC ARC ABSTRACT OF THE DISCLOSURE A method of treating electrodes intended for operation in argon as cathodes of an electric arc wherein said electro des comprise on the active working surface contacting with the arc, elements selected from a series of rare-earth ele- ments, yttrium, alkali-earth elements, elements of Group IV A of the periodic system and compounds thereof, taken both se- parately and under combination, characterized in treating th electrodes in the conditions of arcing of the electric arc so that the electrode being treated functions as a cathode and fed to the cathode area of the arc is a mixture of argon with an active gas which together with at least one of said elements forms a compound having a work function of not more than three electron-volts, the electrode being treated for a period which is at least 100 times less than the period of operation of the electrode in argon, with the currents which do not exceed the upper limit of the range of the working currents, the volume concentration of the active gas in the mixture being from 0.1 to 100%. The active gas is oxygen or nitrogen. When the electrode is operating continuously in an argo arc the treatment is resumed by means of periodically feeding the active gas for a period which is at least 100 times less than the period of operation of the electrode in argon.
270336
Bykhovsky David G.
Voropaev Albert A.
Ogilvy Renault
Vsesojuzny Nauchno-Issledovatelsky Proektno-Konstruktorsky I. Tekhnologi Chesky Institut Elektrosva
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