Method of Making a Cathode from Tungsten and Iridium Powders Using a Reaction Product from Reacting Barium Peroxide with an Excess of Tungsten as the Impregnant.
Patent Application, Filed 24 Aug 89,
DEPARTMENT OF THE ARMY WASHINGTON DC
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The general object of this invention is to provide an improved method of making a long life high current density cathode. A more particular object of the invention is to provide such a method that will be rapid and in which the resulting emission over a set time period will be sufficient. It has now been found that such a method can be provided by making such a cathode from a mixture of tungsten and iridium powders to form a porous billet and using a reaction product formed from reacting barium peroxide with an excess of tungsten as the impregnant for the porous billet. By an excess of tungsten is meant that the molar ratio of barium peroxide to tungsten in forming the impregnant is less than 3 to 1. Patent application. RRH
- Electrical and Electronic Equipment
- Metallurgy and Metallography