【摘要】 研究了稀土钼阴极的热发射、次级发射及亚微米结构钪钨基扩散阴极的热发射性能。结果表明,La2O3-Mo热阴极具有良好的热电子发射性能并具有抗暴露大气的能力。稀土钼次级发射材料经过1000~1200℃的高温激活处理后,材料的最大次级发射系数超过4.0。湿法冶金方法制备的亚微米结构钪钨基扩散阴极850℃b时电流密度可达47 A/cm2,且阴极表面的发射均匀性较普通钪酸盐阴极有明显的改善。更多还原

【Abstract】 The thermionic emission properties of rare earth doped molybdenum cathode and impregnated cathode with sub-micron scandia doped tungsten matrix,and the secondary emission property of rare earth doped molybdenum cathode have been studied in this paper.It was shown that La₂O₃-Mo cathode had good thermionic emission property and the capability of anti-exposition to the atmosphere.The maximum secondary emission coefficient of the rare earth doped molybdenum cathodes activated at 1000～1200 ℃ could exceed 4.0.The impregnated cathodes with submicron scandia doped tungsten matrix exhibited excellent emission property.The current densities of more than 30 A/cm² at 850℃_b could be obtained,and the emission homogeneity was improved with the ordinary scandate cathode.更多还原