Coating apparatus – Gas or vapor deposition – Crucible or evaporator structure
Patent
1978-07-20
1980-11-18
Pianalto, Bernard D.
Coating apparatus
Gas or vapor deposition
Crucible or evaporator structure
118 501, 118500, 118728, 118733, C23C 1308
Patent
active
042339375
ABSTRACT:
A machine for vapor coating a workpiece with a coating metal supplied in wire form includes a vessel enclosing a vacuum chamber and having a door for providing access to the vacuum chamber. The vessel is connected with a vacuum pump for evacuating the vacuum chamber. Mounted within the vacuum chamber is a rack having an attachment screen which is electrically isolated from the remainder of the vessel so that the screen may be placed at a DC potential significantly higher than the vessel. When the door of the vessel is open, the rack may be withdrawn from the chamber for loading the workpiece thereon. The chamber also contains a carriage that moves from one side of the chamber to the other beneath the rack, and the carriage has a plurality of evaporator units mounted along it. Each evaporator unit includes a trough-like boat and means for feeding the coating metal wire into the boat. An electrical potential is impressed across the boat, which functions as a resistance-type heater, and that potential is sufficient in magnitude to elevate the temperature of the boat enough to melt the coating metal wire fed into it. Once all of the evaporator units in the carriage are operating consistently, the carriage is moved across the chamber one or more times, and the vaporized coating metal emitted from the boat is deposited on the workpiece, providing a firmly bonded uniform coating.
REFERENCES:
patent: 2912351 (1959-11-01), Danner et al.
patent: 3543717 (1970-12-01), Adachi
patent: 3928659 (1975-12-01), Baxter
patent: 4116161 (1978-09-01), Steube
McDonnell Douglas Corporation
Pianalto Bernard D.
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