Method for manufacturing a glow cathode for an electron tube
AssigneeSiemens Aktiengesellschaft
InventorsThomas Redel, Clemens Fiebiger
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Abstract
In a method for manufacturing a glow cathode for an electron tube, a layer of an alloy, such as iridium-lanthanum (Ir.sub.2 La), is produced on a substrate by coating the substrate, such as in a number of layers, with the components of the alloy by deposition from the vapor phase, such that the components of the alloy are present in the stoichiometrically correct ratio on the substrate, and in that the substrate is heated for a time duration adequate for alloy formation to a temperature that is lower than the melting temperature of the phase of the alloy having the lowest melting point.
Claims20
A method for manufacturing a glow cathode for an electron tube, comprising the steps of:
- selecting a metal from the group consisting of Ru, Rh, Pd, Os, Ir, Pt and Re;
- selecting an element from the group consisting of Ba, Ca, La, Y, Gd, Ce, Th and U;
- providing a substrate;
- coating said substrate with said metal and said element by vapor deposition in respective quantities for producing a stoichiometric ratio of said metal and said element on said substrate corresponding to a composition of an alloy to be produced;
- and
- heating said substrate with said metal and said element thereon for a duration for forming a layer of said alloy on said substrate.
Dependencies are inferred from the claim text.