FILAMENTARY CATHODE AND ITS MANUFACTURING PROCESS Russian patent published in 2008 - IPC H01J35/06 H01J1/15 

FIELD: electronic engineering.

SUBSTANCE: proposed cathode that can be used, for instance, in X-ray tubes has refractory metal base and electron-emitting metal layer of same alloying metal or its alloy. Cathode manufacturing process includes manufacture of wafer, for instance in the form of refractory metal alloy foil capable of activating depending on temperature, heat treatment in vacuum for its degassing, and activation; in the process alloy is produced by alloying base metal with metal whose emissive characteristics are higher than those of alloy base metal; formed on wafer surface upon its activation in vacuum to produce at least one alloying-metal single layer is electron-emitting layer of desired thickness and of same alloying metal or its alloy. Filamentary cathode produced in this way is characterized in high emissive characteristics at temperatures ranging between 2000 and 2200 °C in high vacuum under cyclic temperature conditions and mechanical loads.

EFFECT: enhanced mechanical strength, enlarged operating temperature range.

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