Thermionic electron emitters and methods of making them

Details Thermionic electron emitters and methods of making them Thermionic electron emitters and methods of making them

1981-03-06

1983-11-22

Dixon, Harold

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313346DC, H01J 114

Patent

active

044171730

ABSTRACT:
A thermionic cathode (FIG. 1) comprises a porous matrix of tungsten (4) impregnated with alkaline earth activator.
A coating (5) 1 .mu.m thick is formed on the matrix (4). The coating is of .sigma. phase alloy of molybdenum and osmium.
Alternative .sigma. phase alloys are disclosed, and various methods of making cathodes are disclosed.

REFERENCES:
patent: 2509702 (1950-05-01), Stanier
patent: 2899592 (1959-08-01), Coppola
patent: 3373307 (1968-03-01), Zalm et al.
patent: 4165473 (1979-08-01), Falce

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