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由于探测技术上的困难,至今对铝酸钡钙扩散阴极表面钙的研究极少。本文利用低压氧锈导下Ca向阴极表面的强化扩散,并借助俄歇电子能谱仪探索了Ca的行为和作用。主要结果是:(1)相当部分Ca以金属态形式存在于钨孔隙中活性物质的近表层区;(2)钙向表面扩散的数量和速度与阴极温度、氧的暴露量成正比,它是一种界面反应驱动下的强化扩散,其激活能约为1.34eV;(3)氧作用下阴极表面氧化钙的增加是导致阴极发射衰减的重要原因,而恢复中毒的再激活机制之一,则是高温下表面钙的蒸发逸离过程。
Due to the technical difficulties of detection, little has been done so far on the calcium diffusion over the surface of barium aluminate. In this paper, the enhanced diffusion of Ca to the cathode surface was induced by low pressure rust, and the behavior and function of Ca were explored by Auger electron spectroscopy. The main results are as follows: (1) A considerable part of Ca exists in a metallic state in the near-surface region of the active species in the tungsten pores; (2) the amount and rate of diffusion of calcium to the surface is proportional to the cathode temperature and the amount of oxygen exposure and is An interface reaction-driven enhanced diffusion, the activation energy of about 1.34eV; (3) under the action of oxygen on the cathode surface of the calcium oxide is an important cause leading to attenuation of the cathode emission, and then restore the poisoning of the reactivation mechanism, then It is the process of evaporation of calcium from the surface under high temperature.