IMPREGNATED CATHODE MANUFACTURING PROCESS Russian patent published in 2006 - IPC H01J19/02 

FIELD: electronic devices and their impregnated cathodes.

SUBSTANCE: impregnated cathode manufacturing process includes mixing of powder W with rhenium acid (HreO₄) to paste condition, coating of cathode base of Mo, W, or their alloys with Re having clean and roughened surface with this paste, and sintering at temperature of 1800 ±50 °C for 3 - 5 minutes followed by impregnation with thermally emissive active material and smoothing by dry polishing. Cathode work function is maximum 2 eV and mechanical endurance at 2250 °C is over 11 000 h.

EFFECT: facilitated manufacture of cathodes of all sizes and shapes.

1 cl