Thermionic Cathode Coating by OMCVD (Organo-Metallic Chemical Vapor Deposition).
DEPARTMENT OF THE NAVY WASHINGTON DC
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The present invention relates to a new and improved thermionic cathode and, more particularly, to a thermionic cathode having a novel coating thereon and to the method of forming the coating. High power electron tube devices, such as travelling wave tubes and other microwave generators, require electron emitters or cathodes having very high electron emission densities. For example, emission densities of approximately 15 Amperes2 sq. cm. and greater are required. Failure of the cathode of a tube always results in tube failure. Since cathodes cannot be replaced without rebuilding the entire tube, early failure of a tubes cathode can be a costly event. In many tubes, lifetimes of tens of thousands or more hours must be achieved in order for the tube to an economically viable device.
- Coatings, Colorants and Finishes