Process for manufacturing microporous cathode coatings

Details Process for manufacturing microporous cathode coatings Process for manufacturing microporous cathode coatings

1978-08-24

1979-09-25

Esposito, Michael F.

Coating processes

Electrical product produced

Electron emissive or suppressive

427126, 427314, 427378, 427380, 427419R, 427422, 427427, B05D 512, B05D 302, B05D 304

Patent

active

041691687

ABSTRACT:
A process for depositing a microporous electron-emissive cathode coating material by spray means is depicted. The process comprises preheating the cathode assembly and spray means by enclosing the assembly and spray means in a cathode assembly spray chamber having a laminar flow of gas therein and stabilizing their temperature at a predetermined elevated value. The cathode assembly is sprayed with a first coat of the material to a predetermined initial thickness. The material is fast dried by holding the cathode assembly in an enclosure having a laminar flow of gas at an elevated temperature. A second coat of the material is then sprayed on to a predetermined final overall thickness. Due to the preheating and fast drying according to the invention, the coating material so deposited is uniformly dense and the coating surface is smooth and microporous to provide enhanced emissivity and life and enhanced resistance to poisoning by contaminants.

REFERENCES:
patent: 2943957 (1960-07-01), Grattidge
patent: 3722045 (1973-03-01), Buescher

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