Method of making a borided dispenser cathode

Details Method of making a borided dispenser cathode Method of making a borided dispenser cathode

H - Electricity

01

J

148/24

H01J 1/28 (2006.01) H01J 9/04 (2006.01)

Patent

CA 1212889

-9- ABSTRACT: "Method of making a borided dispenser cathode". Method of making a borided dispenser cathode comprising a high-melting-point basic material in which emissive material is present in the form of a metal oxide, which metal oxide is reduced continuously during operation of the cathode and diffuses to the surface in atomic form and forms there a monoatomic layer, which method comprises the following steps: a) cleaning the cathode by annealing in a hydrogen-containing atmosphere, b) heating the cathode in a gas atmosphere which contains a gaseous boron compound at such a temperature that boron is deposited on the cathode, c) heating the cathode in a vacuum or a non reactive atmosphere to the operating temperature of the cathode and keeping it at this temperature for while (f.i. a few minutes) so that boride is formed. Such a method may be carried out by means of apparatus with which carbonization has been carried out so far. Borided cathodes have a better emission than carburized cathodes and yield in a better vacuum in the tubes in which they are used.

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