PLASMA GUN WITH ADJUSTABLE CATHODE

A plasma generating system comprises a plasma gun (10) including a hollow cylindrical anode member (24D), a hollow cylindrical intermediate member (26) electrically isolated from and juxtaposed coaxially with the anode member to form a plasma-forming gas passage (28) through the intermediate member...

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Bibliographische Detailangaben
Hauptverfasser:	CHANDRA BHANSALI, THOMAS F. BERNECKI, JOHN F. KLEIN, WILLIAM P. RUSCH, KEVIN J. VARLEY
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY PLASMA TECHNIQUE PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OFNEUTRONS PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMICBEAMS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	A plasma generating system comprises a plasma gun (10) including a hollow cylindrical anode member (24D), a hollow cylindrical intermediate member (26) electrically isolated from and juxtaposed coaxially with the anode member to form a plasma-forming gas passage (28) through the intermediate member and the anode member, and an axially movable cathode member (20). The intermediate member comprises tubular segments (24A-C) separated by resilient insulating spacing rings (30A-C) held in compression. Arc radiation is blocked from the spacer rings by meanders (90) in the inter-segment slots and further by ceramic barrier rings. An electric motor or pneumatic piston responsive to a measurement of arc voltage continually adjusts the axial position of the cathode tip relative to the anode nozzle (14) so as to maintain a predetermined arc voltage.