Low-temperature thermionic emitter

Details Low-temperature thermionic emitter Low-temperature thermionic emitter

1975-06-13

1977-09-27

Weiffenbach, Cameron K.

Coating processes

Electrical product produced

Welding electrode

427 77, 427226, 427228, 427385R, 427388R, B05D 512

Patent

active

040512720

ABSTRACT:
An improved photodelineatable cathode material is disclosed comprising a combination of triple carbonate (TC) and a hydrocarbon polymeric photoresist PR. A mixture of TC powder and PR is applied to a cathode by spraying, spinning or dipping and is then subjected to activation at a temperature from about 800.degree. C up to the melting temperature. The cathodes can be activated at a temperature as low as 800.degree. C and still deliver a 0-field, temperature-limited current density of 750 milliamperes per sq. centimeter at 600.degree. C. If a pattern is desired, the coating is exposed through a suitable mask to actinic light to harden the photoresist in the desired areas. Following exposure, the exposed image areas are developed and the unexposed portions of the coating are removed with solvent. When dry, the cathode is ready for activation.

REFERENCES:
patent: 2830917 (1958-04-01), Kern
patent: 2895854 (1959-07-01), LaRocque
patent: 2985548 (1961-05-01), Blickwedel et al.
patent: 3222173 (1965-12-01), Belko, Jr. et al.
patent: 3474718 (1969-10-01), Guthrie et al.
patent: 3597271 (1971-08-01), Cawley et al.
patent: 3622322 (1971-11-01), Brill

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