Manufacturing method for dispenser code

Details Manufacturing method for dispenser code Manufacturing method for dispenser code

1991-01-24

1992-03-03

Ramsey, Kenneth J.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

313346DC, H01J 904

Patent

active

050928058

ABSTRACT:
A method for manufacturing a dispenser cathode is disclosed. The method includes a step of immersing, in an aqueous solution containing an aluminum compound, either (1) a powder mixture made by mixing metal powder selected from among Mo, Ta, W or alloys thereof with a carbonate selected form the group of Sr, Ba, Ca, or mixtures thereof or (2) a pellet of such a metal powder mixture formed into a desired shape, such that the aluminum ingredient in the aqueous solution can be impregnated into (1) the powder mixture or (2) the pellet. According to the present method, heat treatment at a temperature of over 1700.degree. C. is not required, unlike conventional methods where such high heat treatment is required. Therefore the decrease of electron releasing efficiency due to adverse reactions generated by the high temperature heat treatment of the prior art can be avoided.

REFERENCES:
patent: 2844494 (1958-07-01), Rexer
patent: 3458749 (1969-07-01), Van Stratum et al.
patent: 4007393 (1977-02-01), Van Stratum et al.

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