氧化物阴极是人们很熟悉的一种热电子发射体。一般认为这种阴极是靠阴极基金属中的杂质元素(即通常所说的激活剂)在热的作用下扩散到氧化物涂层中,使氧化钡还原成钡原子而得到良好的热电子发射电流。这种阴极的发射电流不仅受阴极基金属本身及基金属中杂质的影响,而且与杂质在阴极基金属中的扩散状态关系也密切。本文所介绍的用锆铝(Zr-Al)合金作激活剂的阴极与普通氧化物阴极不同,它所用的锆铝合金激活剂不是加在阴极基金属中,而是直接加在氧化物涂层中。这样,激活剂就直接与 Oxide cathodes are well known as hot electron emitters. It is generally believed that this cathode is diffused into the oxide coating under the action of heat by an impurity element (usually referred to as an activator) in the cathode base metal to reduce the barium oxide to the barium atom to obtain a good thermionic emission Current. The emission current of this cathode is not only affected by the impurities in the base metal and the base metal, but also closely related to the diffusion state of impurities in the base metal. The zirconium aluminum (Zr-Al) alloy described in this paper as the activator cathode and ordinary oxide cathode is different from the zirconium-aluminum alloy used in its activation agent is not added to the cathode metal, but directly added to the oxide coating in. In this way, the activator works directly with it