Method for coating the cathode of an electron gun with a thermio

Details Method for coating the cathode of an electron gun with a thermio Method for coating the cathode of an electron gun with a thermio

1989-11-07

1991-08-13

Lusignan, Michael

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427 78, 427 77, 427423, 427425, 427427, 427424, 118303, 118320, B05D 108, B05D 512

Patent

active

050395475

ABSTRACT:
There is disclosed a method for coating the cathode of an electron gun with a thermionic emissive substance comprising the steps of producing a plasma within a nozzle body, injecting nitrogen, hydrogen, helium or argon, or mixtures thereof into said nozzle body, and feeding a powder or sintered bodies of said thermionic emissive substance around the negative electrode of said plasma, whereby said thermionic emissive substance is sprayed and deposited on the metal cap of said cathode in an oxidized state under the heat and pressure of said plasma. The nozzle body oscillates around a pivot while a plurality of electron gun cathodes move on a curved carrier in front of the nozzle for depositing the emissive substance in a zig zag path across the plurality of cathodes.

REFERENCES:
patent: 4596718 (1986-06-01), Gruner
Yoshida et al., "High-Tc Superconducting Films of Bi-Pb-Sr-Ca-Cu Oxide Prepared by Plasma Spraying", Jpn. J. Appl. Phys. 28(4) Apr. 1989, L639-642.
Murphy et al., "Ceramic Electrocatalysts for the Oxygen Evolution Reaction II: Plasma Sprayed Perovskite Coatings", Journal of the Canadian Ceramic Society, vol. 54, 1985, pp. 14-20.
Kirkland et al., "Thermal Spraying Superconducting Oxide Coatings", Adv. Cer. Mat., vol. 2, No. 3B Special Issue, Jul. 1987, pp. 401-410.

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