H - Electricity – 01 – J
Patent
H - Electricity
01
J
316/47
H01J 9/04 (2006.01) H01J 23/04 (2006.01)
Patent
CA 1080790
Abstract of the Disclosure A high current density long life cathode for use in high power microwave tube applications is made by: machine a porous tungsten pellet with copper in its pores to the desired cathode shape to form the emitting surface of the cathode and cleaning the porous pellet ultrasonically in trichlorethylene, then acetone, and then methanol; firing the tungsten pellet at about 1800°C in a reducing atmosphere; etching the tungsten pellet ultra- sonically in a solution of 50 parts of concentrated nitric acid in 50 parts of water; ultrasonically cleaning the tungsten pellet for about five minutes in an aqueous alkaline solution; cleaning the tungsten pellet in hot deionized water and then air drying the tungsten pellet in an oven for five minutes at about 150°C; refiring the tungsten pellet in a reducing atmosphere at about 1800°C; impregnating the porous tungsten pellet with a mixture of BaWO6, Ba2SrWO6 and ZrH2 in a nonreducing, nonoxidizing atmosphere at about 1900°C to 2000°C; and firing the impregnated tungsten pellet in a reducing atmosphere of dry hydrogen at about 1840°C for about two to five minute.
298208
Newman Albert F.
Smith Bernard
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