在宇宙航行中应用的电子管的新型阴极,要求在尽可能低的阴极温度下和尽可能长的时期内具有最高的电流密度。为满足上述要求,必须降低逸出功,对于金属陶瓷阴极,原则上呈现两种可能性:对于钡钨阴极,可以用其它的元素代替活 The new cathodes for electron tubes used in cosmic voyage require the highest current densities at the lowest possible cathode temperature and for as long as possible. In order to meet the above requirements, it is necessary to reduce the work function, for the cermet cathode, in principle, there are two possibilities: For the barium tungsten cathode, you can use other elements instead of live