Plasma gun that reduces cathode contamination

Details Plasma gun that reduces cathode contamination Plasma gun that reduces cathode contamination

1983-03-03

1985-09-10

Paschall, M. H.

Electric heating

Metal heating

By arc

219121PR, 219121PQ, 219121P, 219121PL, 31323141, 204192N, 156345, B23K 900, H05H 100

Patent

active

045408688

ABSTRACT:
In order to avoid contamination of a bombarding plasma jet by the products f cathode erosion in a plasma gun having a cathode and an anode, with which a connecting plasma is produced which strikes vertically onto the bombarding plasma jet and flows through a cooled duct between the cathode and the bombarding plasma jet, it is suggested that the cathode should be located in an enclosed cavity, the duct emerging from a wall of this cavity and the cathode being laterally offset relative to the inlet port to the duct, and that a gas supply line should open into the duct between the inlet port and the end of the duct facing the bombarding plasma jet, gas being supplied through this supply line as a substitute for the deposited cathode material in order to maintain a substantially constant particle density in the connecting plasma.

REFERENCES:
patent: 3770935 (1973-11-01), Tatero et al.
patent: 4236059 (1980-11-01), McComas et al.
patent: 4284879 (1981-08-01), Eveson et al.

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