Patent ID: 9187828
Filing Date: 2015-11-17
Classification: C23C,Y10T

Abstract:
1. Filament coating apparatus to coat a filament in the absence of each of the liquid metals mercury, cadmium, indium and gallium, comprising: a vertical deposition chamber in which a coating is to be applied to a filament to form a coated filament; an entrance electrode defining an entrance passage through an upper wall of the deposition chamber; and an exit electrode defining an exit passage through a lower wall of the deposition chamber; said entrance passage being shaped to permit said filament to slide into said deposition chamber whilst retaining direct electrical contact between said filament and said entrance passage, and said exit passage being shaped to permit said coated filament to slide out of said deposition chamber whilst retaining direct electrical contact between said coated filament and said exit passage; said entrance and exit electrodes each being formed as a plate having capillary tubes inserted therein to form the entrance and exit passages, respectively, said capillary tubes being formed of a harder material than said plates.