Impregnated cathode with composite top coat

Details Impregnated cathode with composite top coat Impregnated cathode with composite top coat

1994-10-31

1999-08-10

Patel, Vip

Electric lamp and discharge devices

Electrode and shield structures

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

313337, H01J 114

Patent

active

059363347

ABSTRACT:
A cathode having a matrix body (1) impregnated with an alkaline earth compound, whose surface is provided with a top coat (2, 3, 4) comprising a high melting point metal, such as particularly tungsten, and scandium. A high emission at a low operating temperature and simultaneously a rapid recuperation after ion bombardment as well as a long lifetime are achieved in that the top coat comprises at least two layers of different composition, with a purely metallic layer (5, 6, 7) being provided on the impregnated matrix body (1), which layer comprises scandium and a high melting point metal such as particularly tungsten and/or rhenium, and in that a metallic layer of a high melting point metal such as particularly tungsten is provided as a sealing layer.

REFERENCES:
patent: 4101800 (1978-07-01), Thomas et al.
patent: 4594220 (1986-06-01), Hasker et al.
patent: 4783613 (1988-11-01), Yamamoto et al.
patent: 4855637 (1989-08-01), Watanabe et al.
patent: 4980603 (1990-12-01), Kimura et al.
patent: 5006753 (1991-04-01), Hasker et al.
patent: 5318468 (1994-06-01), Lotthammer et al.

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