Dispenser cathode with porous sintered compacted metal dispenser

Details Dispenser cathode with porous sintered compacted metal dispenser Dispenser cathode with porous sintered compacted metal dispenser

1995-03-09

1997-01-14

O'Shea, Sandra L.

Electric lamp and discharge devices

Electrode and shield structures

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

313337, H01J 1906

Patent

active

055942997

ABSTRACT:
A dispenser cathode including a dispenser body formed of a metal matrix and an emission surface formed of emission material impregnated into the dispenser body metal matrix. The metal matrix is a porous sintered metal matrix containing at least one metal frown a first group (W, Mo, Cr) and at least one metal of a second group (Fe, Co, Ni, Ru, Rh, Pd, Re, Os, Ir, Pt) and chromium oxide. The chromium oxide and the metals from the two groups are provided as a powder mixture to form the matrix. The emission material includes at least two alkaline earth metal oxides such as CaO, BaO and at least one oxide of a metal of group IIIa or IIIb of the Periodic Table. The oxide of a metal group is Al.sub.2 O.sub.3.

REFERENCES:
patent: 2995674 (1961-08-01), Apelbaum et al.
patent: 3155864 (1964-11-01), Coppola
patent: 4417173 (1983-11-01), Tuck et al.
patent: 4982133 (1991-01-01), Choi
patent: 5318468 (1994-06-01), Lotthammer et al.

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