HEATED EMITTER MATERIAL FOR SURFACE IONIZATION OF ORGANIC COMPOUNDS IN THE OPEN AND HEATED EMITTER ACTIVATION PROCESS Russian patent published in 2005 - IPC

FIELD: electrical engineering.

SUBSTANCE: proposed heated emitter material is chosen basing on vanadium, molybdenum, or tungsten alloy doped with zirconium or hafnium in the amount of 0.1 to 2.0 mass percent, rhenium in the amount of 0.02 to 0.3 mass percent, and ruthenium or rhodium in the amount of 0.02 to 0.3 mass percent. Proposed activation process for heated emitter material characterized in high effectiveness of ionizing organic compounds on ion heated emitter surface in open atmosphere and facilitated activation of heated emitter including criterion of controlling end-of-activation procedure includes emitter heating in air stream whose temperature ranges between -20 and +30 °C and relative humidity of 10 to 85% in area between heated emitter and auxiliary electrode; for the process mean air pumping speed is set between 0.2 and 5 m/s, emitter is heated to temperature ranging between 350 and 600 °C and exposed to this temperature till activation process of heated emitter ceases; end of heated emitter material activation process is recognized by magnitude of background ion current in heated emitter and auxiliary electrode circuit.

EFFECT: enhanced ionization stability with time and air humidity variations.

3 cl, 3 dwg, 1 tbl