Fast Turn-On Osmium Coated Cathode.

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Abstract:

This abstract discloses a fast turn-on refractory coated cathode comprising a porous tungsten metal matrix impregnated with barium calcium aluminate and coated with osmium. The osmium coating has a planned series of interruptions with each interruption being on the order of several microns in width to thereby expose the tungsten. These interruptions permit the barium and oxygen from the impregnant to rise to the cathode surface during activation or reactivation to form a desired near monolayer of barium and oxygen to enhance electron emission. Thus, this cathode design provides a fast turn-on characteristic even after shelf storage. Author

Author(s):
Marrian, C. R. K. ; Haas, G. A. ; Shih, A.
Author Organization(s):
DEPARTMENT OF THE NAVY WASHINGTON DC
Descriptive Note:
Patent Application,
Pagination:
0017

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Availability: This Government-owned Invention Available For U.s. Licensing And, Possibly, For Foreign Licensing. Copy Of Application Available Ntis.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
PAT-APPL-589 913
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*Patent applications, *Cathodes, Refractory coatings, Tungsten, Matrix materials, Porous materials, Impregnation, Barium compounds, Calcium compounds, Aluminates, Osmium, Interruption, Oxygen, Surfaces, Activation, Layers, Electron emission, Quick reaction, Starting
Field(s)/Group(s):
Electrical and Electronic Equipment
Report Date:
1984 Mar 15