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The scandia doped tungsten powders have been obtained by a new method of spray drying combined with two-step reduction in hydrogen atmosphere. The impregnated cathode prepared with the obtained powders has an excellent emission capability of 121 A/cm2 at 950° b in pulsed condition. The DC life test result indicates that the emission current density of 40 A/cm2 has lasted up to 4000 hours.
In this paper, a new fabrication method of barium-calcium aluminate impregnated cathodes is reported. Barium-calcium aluminates were fabricated by one-pot hydrothermal reaction. The sintering temperature of the material is lower than the conventional method about 100 °C and the impregnation temperature is decreased about 50 °C. The pulsed emission current density of this cathode could reach 12.64A/cm...
A new kind of cathode, LaC2-Mo cathode was prepared through spark plasma sintering method by using the mixed powder of LaC2 which was prepared by vacuum melting method and molybdenum. It was found that the emission properties of LaC2-Mo cathode increases with the LaC2 content increasing. The emission current density of LaC2-Mo cathode which contains 3.5wt.% LaC2 could reach 0.90A/cm2 at 1400b whereas...
The scandia doped tungsten powders have been obtained by a new method of spray drying combined with two-step reduction in hydrogen atmosphere. Based on the powders, the cathode impregnated with 612 aluminates (SDI-612) has excellent emission capability of 72.2A/cm2 at 900oCb, moreover, the SDI-612 cathode has a lower evaporation rate of 8.45∗10−9g.cm−2s−1 at 1150oCb.
Emission properties of nanosized scandia doped dispenser (SDD) cathodes tested at pulse mode with different pulse widths and duty cycles as well as at DC mode are reported and discussed in this paper.
In this paper, the carburization method and the carburization mechanism have been studied in order to obtain the carburized La2O3 doped Mo filament cathode which could provide good emission property.
Emission properties of Scandia Doped Dispenser (SDD) cathodes tested in Pierce Gun open structures have been reported in this paper. 80-100 A/cm2 Space-Charge Limited (SCL) current densities have been obtained at designed anode voltages and normal operating temperatures for cathodes with either flat surfaces or concave surfaces. The influences of anode effects on cathodes, which appear in close-spaced...
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