Plasma spray device with external powder feed

Electric heating – Metal heating – By arc

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Details

21912148, 2191215, 21912151, 219 7616, B23K 900

Patent

active

050138839

ABSTRACT:
The front face of the nozzle of a plasma spray device has a shallow annular recession therein. The recession is bounded inwardly by an extended portion of the nozzle, outwardly by a ring member and rearwardly by an inner surface. The ring member has therein a plurality of arcuately equally spaced holes directed radially inward toward the inner face, the holes communicating with a source of air. Powder is injected radially into the plasma stream external to the nozzle member proximate the outlet end. The air flow from the holes and entrainment of surrounding atmosphere by the plasma stream drive a toroidal vortex anchored in the recession, the vortex effecting a wiping flow on the nozzle face such as to inhibit powder from depositing on the nozzle face.

REFERENCES:
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patent: 4370538 (1983-01-01), Browning
patent: 4389559 (1983-06-01), Rotolico et al.
patent: 4445021 (1984-04-01), Irons et al.
patent: 4558201 (1985-12-01), Hatch
patent: 4672171 (1987-06-01), Cusimano et al.
patent: 4674683 (1987-06-01), Fabel
patent: 4777342 (1988-10-01), Hafner

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