Abstract
A new type of thermionic cathode, lanthanum carbide doped tungsten cathode, has been fabricated through a spark plasma sintering method by using the mixed powders of lanthanum carbide and tungsten. Lanthanum carbide powder was prepared by a levitation melting method in vacuum. The thermionic emission properties have been investigated. It is found that the concentration of lanthanum carbide has a significant influence on the emission properties of the cathodes. The emission current density of the tungsten cathode at 1400°Cb was increased dramatically from 1.09 to 3.12A/cm2 with the increase of concentration of lanthanum carbide from 3.5 to 10wt%. The emission mechanism of the cathode has been discussed.
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