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本文对渍制钡钨阴极多孔钨结构与发射和蒸发性能的有关数据进行了分析研究。结果表明,对于多孔钨结构,钨粉的颗粒度和孔隙的孔径大小决定了小孔内表面的总面积和钡在钨表面上的扩散路程,钡输送通道的大小和长短。这些因素对钡钨阴极的性能和工作机理有密切关系,但仅用多孔钨孔隙度来表征阴极性能那是不够严格的。最后我们提出了对于不同用途的阴极应采用的多孔钨结构。
In this paper, we analyze and analyze the data about the porous tungsten structure of the barium-tin-tungsten cathode and its emission and evaporation properties. The results show that for the porous tungsten structure, the particle size of the tungsten powder and the pore size of the pores determine the total area of the inner surface of the pores and the diffusion path of the barium onto the tungsten surface, and the size and length of the barium transport channel. These factors are closely related to the performance and working mechanism of the barium-tungsten cathode. However, it is not strictly enough to characterize the cathode performance only with porous tungsten porosity. Finally, we propose a porous tungsten structure that should be used for cathodes for different applications.