Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1979-06-11
1981-03-17
Newsome, John H.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
118620, 219121P, 427423, B05D 108
Patent
active
042567793
ABSTRACT:
A plasma spray method capable of directing plasticized powders against a substrate for deposition of a protective coating thereon is disclosed. Various structural details of the apparatus described enable the attainment of high particle velocities without melting the particles. The technical concepts employed are directed to normalizing the temperature of the plasma stream at a reduced value prior to the injection of coating particles. A general reduction in temperature and substantial elimination of a thermal spike at the core of the stream are achieved. Coating particles are injected into the plasma stream only after the plasma is first cooled and then preferably accelerated. In detailed embodiments, a nozzle extension assembly having a plasma cooling zone, a plasma acceleration zone, a powder injection zone and a plasma/powder discharge zone is affixed to the downstream end of a conventional plasma generator.
REFERENCES:
patent: 2960594 (1960-11-01), Thorpe
patent: 3010009 (1961-11-01), Ducati
patent: 3075065 (1963-01-01), Ducati et al.
patent: 3145287 (1964-08-01), Siebein et al.
patent: 3301995 (1967-01-01), Eschenbach et al.
patent: 3676638 (1972-07-01), Stand
Dorozhkin et al., "Soviet Powder Metallurgy and Metal Ceramics", vol. 13, No. 12(144), pp. 993-996, Dec. 1974.
Hanna Earl M.
McComas Charles C.
Sokol Larry S.
Newsome John H.
United Technologies Corporation
Walker Robert C.
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