B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
316/47, 117/57
B05D 3/02 (2006.01) B05D 3/04 (2006.01) B05D 5/12 (2006.01) H01J 9/04 (2006.01) H01J 29/02 (2006.01)
Patent
CA 1124587
ABSTRACT OF THE DISCLOSURE A process for depositing a microporous electron-emissive cathode coating material by spray means is depicted. The process com- prises preheating the cathode assembly and spray means by enclosing the assembly and spray means in a cathode assembly spray chamber having a laiminar 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 final 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 inven- tion, 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.
326829
Macrae & Co.
Zenith Radio Corporation
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