Title :
Vacuum Evaporation of Composite Oxides and Durability of Cathodes
Author :
Zorkin, A.Ya. ; Zhevalev, O.U. ; Konushkov, G.V. ; Zorkina, O.A.
Author_Institution :
Saratov State Tech. Univ.
Abstract :
Quasi-equilibrium models of influence of time, temperature and initial composition of oxide-cathodes and aluminate cathodes on the barium content in composite oxides are explored. Increase of calx concentration reduces the activity of oxygen in system "composite oxide - oxide mist" and increases the barium activity, which as a result increases the speed of baryta congruent evaporation. For 1200 hours at the temperature of 1400 K, the mole number of baryta is reduced with 3 till 2.42 in oxide of initial composition 3BaO CaO Al2O3 and with 3 till 2.55 in oxide 3BaO 0.5CaO Al2O3 at length of matrix interstice of 0.3 mm
Keywords :
aluminium compounds; barium compounds; calcium compounds; cathodes; evaporation; vacuum deposition; 0.3 mm; 1200 hours; 1400 K; BaO-CaO-Al2O3; aluminate cathodes; baryta congruent evaporation; calx concentration; cathodes durability; composite oxide; composite oxides vacuum evaporation; oxide mist; oxide-cathodes; quasi-equilibrium models; Barium; Cathodes; Electron beams; Magnetic fields; Temperature; Vacuum technology;
Conference_Titel :
Actual Problems of Electron Devices Engineering, International Conference on
Conference_Location :
Saratov
Print_ISBN :
1-4244-0246-8
Electronic_ISBN :
1-4244-0247-6
DOI :
10.1109/APEDE.2006.307443
