Method of manufacturing a hot-cathode element

Details Method of manufacturing a hot-cathode element Method of manufacturing a hot-cathode element

1992-04-20

1994-02-01

Owens, Terry J.

Coating processes

Direct application of electrical, magnetic, wave, or...

Pretreatment of substrate or post-treatment of coated substrate

427535, 427539, 427569, 427571, 427576, 427 69, 4271261, 4271263, 4272557, 204241, B05D 304, B05D 510, C23C 1640, C23C 1650

Patent

active

052830853

ABSTRACT:
A method of manufacturing a hot-cathode element which consists of a rare-earth-oxide-doped refractory metal, notably thoriated tungsten, and which also contains carbon components, first a plurality of layers of the hot-cathode element being successively deposited on a substrate member (2) by means of a CVD process, after which notably the hot-cathode element is separated from the substrate member (2). The strength required for further working of the hot-cathode element is improved in that in the course of the CVD process decarburizing intermediate treatments are performed, the hot-cathode element being carburized during an aftertreatment.

REFERENCES:
patent: 2501563 (1950-03-01), Colbert et al.
patent: 4487880 (1984-12-01), Ueno et al.
patent: 4713259 (1987-12-01), Gartner et al.
patent: 4751101 (1988-06-01), Joshi

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