石墨阴极，其特征在于阴极炭块是由粒度小于8毫米的30-60%电煅无烟煤，15-30%焙烧碎，10-50%石墨和15-25%沥青组成。
理论上，如果用硅大量取代石墨，石墨阴极就可能变细，从而扩大容纳活性材料的空间。
In theory, if you replaced a lot of graphite in the cell with silicon, the thickness of the graphite negative electrode could be reduced.
本文以石墨阴极为例介绍了一种自热式阴极的横向放电特性，指出热电子发射是该阴极的主要机理。
Taking graphite cathode as an example, the transverse discharge characteristics of a self heated cathode are described. It is indicated that the cathode mechanism is hot electron emission.
在电子束产生过程中，屏蔽半径应尽可能地小，且击穿延时时间较短，故选择石墨作为阴极材料。
Because of its small screening radius and short delay time, graphite is chosen as the cathode material.
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