Method of manufacturing a scandate dispenser cathode and scandat

Details Method of manufacturing a scandate dispenser cathode and scandat Method of manufacturing a scandate dispenser cathode and scandat

1986-08-22

1989-10-10

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making porous product

419 19, 419 27, C22C 2912

Patent

active

048730521

ABSTRACT:
A method of manufacturing a scandate dispenser cathode having a matrix (1) at least the top layer of which consists substantially of a mixture of tungsten with scandium oxide or with a mixed oxide comprising scandium oxide. When sintering of the matrix is carried out at a temperature between 1300.degree. and 1700.degree. C., preferably at approximately 1500.degree. C. and in a hydrogen atmosphere, cathodes are obtained having a better recovery after ion bombardment compared with cathodes sintered at 1900.degree. C. Sintering in hydrogen results in a better reproducibility.

REFERENCES:
patent: 2813807 (1957-11-01), Levi
patent: 3265495 (1966-08-01), Freytag et al.
patent: 4594220 (1986-06-01), Hasker et al.
patent: 4625142 (1986-11-01), Van Esdonk et al.
patent: 4698096 (1987-10-01), Schmidberger et al.
Hausher, Handbook of Powder Metallurgy, 1973, pp. 13 and 15.

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