Method of treating tungsten cathodes

Details Method of treating tungsten cathodes Method of treating tungsten cathodes

1988-05-06

1989-06-06

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

445 58, 427 77, 313346R, H01J 904

Patent

active

048368164

ABSTRACT:
A method of treating a tungsten cathode that is comprised of coating the surface of the tungsten cathode with a triple carbonate suspension. The coated tungsten cathode is placed in a heated oxidizing environment (e.g., air, oxygen, or carbon dioxide) and heated for a sufficient amount of time in order to form a diffuse coating of triple carbonates and tungsten oxide. Thereafter, the triple carbonates are reduced to their respective oxides by passing heater current through the tungsten cathode. When used in conjunction with the manufacture of a fluorescent lamp, the formation of this diffuse coating of carbonates enhances the chances of forming barium tungstate during the cathode activation process. As a result, the life of the fluorescent lamp is increased and the amount of phosphor darkening is reduced.

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Kohl, Materials and Techniques for Electron Tubes, Reinhold Publishing Corp., New York, N.Y., (1960), pp. 551-558.

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