摘要
采用常规钨粉、纳米钨粉和掺杂氧化钪纳米钨粉制备了浸渍阴极。利用扫描电镜、压汞仪等测试手段分析了阴极基体的微观结构,用水冷阳极二极管检测了阴极的发射性能。研究表明,采用纳米钨粉制备的阴极基体具有比常规阴极基体更细微的显微结构,阴极的直流发射电流密度为4.6 A/cm2,而常规阴极为4.13 A/cm2。掺杂氧化钪后,阴极的发射性能明显提高,其直流发射电流密度为5.31 A/cm2。
Normal tungsten powder, nano tungsten powder and nano tungsten podwer doped with Sc2O3 were used to prepare dispenser cathode. The microstructure was studied by SEM and mercury intrusion poremeasurement （MIP）. The emission characteristics were researched in water-cooled anode diode. The result shows that nano-tungsten cathode has smaller pore than the routine cathode, and the emission current density is 4.6 A/cm^2, which is higher than that of the routine cathode （4. 13 A/cm^2）. The cathode prepared by mechanical mixing scandia and tungsten has higher emission current density than that of nanotungsten cathode. The direct emission current density is 5.31 A/cm^2.
出处
《有色金属（冶炼部分）》
CAS
北大核心
2008年第6期51-53,共3页
Nonferrous Metals（Extractive Metallurgy)
关键词
纳米钨粉
浸渍阴极
发射电流密度
Nano tungsten matrix
Dispenser cathode
Emission current density
