钡钨阴极的性能与多孔钨结构的关系
THE RELATIONS OF BARIUM-TUNGSTEN CATHODE PROPERTIES TO THE TUNGSTEN MATRIX STRUCTURE
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摘要: 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。
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Abstract: Some data of emission and evaporation properties referring to the tungsten matrix structure of the impregnated cathode are analyzed. The results indicate that the particle size of tungsten powder and the pore size in the porous matrix determine the total inside surface area of all pores, the diffusion length of barium over the tungsten grain surface, and the diameter and length of path for the barium to transport through. These factors all relate to the properties and operation mechanism of an impregnated cathode; therefore, it would not be strictly right to employ only the matrix porosity for characterizing the cathode properties. Finally, the preferred structure of porous tungsten matrix depending on different applications of impregnated cathode is proposed. -
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