Electric heating – Metal heating – By arc
Patent
1992-12-03
1994-01-11
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912151, 21912137, 21912159, 21912148, 373 18, 75 1019, B23K 900
Patent
active
052783847
ABSTRACT:
An apparatus for low temperature plasma treatment of powder particles for modifying the surface properties thereof, comprising means for the creation of a low pressure zone and, in association therewith, at least one cascade arc torch generator to form a plasma torch which is directed into said low pressure zone, means for the supply by gravity of powder particles to be treated into said low pressure zone and conduit means for the removal of the treated powder particles from said low pressure zone, said cascade arc generator having an orientation such that said plasma torch enters said low pressure zone at a downward angle (.alpha.) to the horizontal of from about 15.degree. to about 60.degree., and said conduit means being directed away from said plasma torch at an upward angle (.beta.) to the horizontal of from about 15.degree. to about 80.degree.;
REFERENCES:
patent: 4105888 (1978-08-01), Fey
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patent: 4818837 (1989-04-01), Pfender
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patent: 4948485 (1990-08-01), Wallsten et al.
patent: 5176938 (1993-01-01), Wallsten et al.
Matsuzawa Yasuo
Wallsten Hans I.
Yasuda Hirotsugu K.
Paschall Mark H.
Plasmacarb Inc.
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