Method of manufacturing cathode assembly
AssigneeSony Corporation
InventorKouichi Momoi
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Abstract
A method of manufacturing a cathode assembly for use with an electron tube in which the cathode assembly is comprised of a metal cap composed principally of nickel Ni and welded to a cathode sleeve composed principally of nickel Ni, an electron emissive coating layer formed on a surface of the base metal, and a supporting member welded to the cathode sleeve. The method comprises the step of treating or conducting at least the metal cap under a solution heat treatment.
Claims12
In a method of manufacturing a structure for enclosing the filament of an indirectly heated cathode assembly involving the steps of securing a nickel base alloy cap to a nickel-chromium alloy sleeve, darkening the sleeve by heating in a reducing atmosphere containing water vapor, and applying a coating of electron emissive material onto a portion of the exterior of said cap, the improvement whereby the electron emissive characteristics of the cathode assembly are improved which comprises:
- solution heat treating said nickel base alloy cap in a non-oxidizing atmosphere at a temperature of from 1000.degree. to 1400.degree. C. to effect a solution heat treatment thereof and
- quenching said cap in a non-oxidizing atmosphere to a temperature below 100.degree. C. within 5 minutes,
- said solution heat treating and said quenching being carried out prior to application of said electron emissive material onto said cap.
Dependencies are inferred from the claim text.