Electric heating – Metal heating – By arc
Patent
1992-02-12
1994-07-26
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912152, 21912151, 219 7616, B23K 900
Patent
active
053328850
ABSTRACT:
The invention provides a plasma spray apparatus for spraying powdery or gaseous material. The apparatus comprises an indirect plasmatron for creating an elongated plasma torch. The powdery or gaseous material is axially fed into the plasma torch. The plasmatron comprises a cathode assembly, an annular anode member located distantly from the cathode assembly and a plasma channel extending from the cathode assembly to the anode member and having a zone with a reduced diameter located in the region of the plasma torch which is near to the cathode assembly. 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.
The cathode assembly comprises a central insulating member arranged in a fixed position with regard to the plasma channel inlet nozzle and further comprises a plurality of cathode elements embedded in the insulating member.
REFERENCES:
patent: 3866089 (1975-02-01), Hengartner
patent: 4521666 (1985-06-01), Severance, Jr. et al.
patent: 4639570 (1987-01-01), Zverina
patent: 4725447 (1988-02-01), Pfender
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