Electric heating – Metal heating – By arc
Patent
1993-10-28
1995-04-11
Paschall, Mark H.
Electric heating
Metal heating
By arc
219 7616, 21912152, 21912148, 427569, B23K 1000
Patent
active
054060460
ABSTRACT:
The plasma spray apparatus for spraying powdery material, particularly for the coating of the surface of a work piece, comprises an indirect plasmatron adapted to create an elongated plasma torch, having a central longitudinal axis and structure for feeding the powdery material into the plasma torch.
The plasmatron comprises a cathode assembly having at least three cathode members evenly distributed along a circle around the central longitudinal axis of the plasmatron, an annular anode member located distantly from the cathode member and a plasma channel extending from the cathode assembly to the anode member.
The plasma channel is delimited by the annular anode member as well as by a plurality of annular neutrode members which are electrically insulated from each other, and the structure for feeding the powdery material into the plasma torch are located close to the anode member.
REFERENCES:
patent: 3839618 (1974-10-01), Muehlberger
patent: 4639570 (1987-01-01), Zverina et al.
patent: 4780591 (1988-10-01), Bernicki et al.
patent: 4788408 (1988-11-01), Wlodarczyk et al.
patent: 4818837 (1989-04-01), Pfender
patent: 5008511 (1991-04-01), Ross
patent: 5043548 (1991-08-01), Whitney et al.
Paschall Mark H.
Plasma Tecknik AG
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