Zuo Tie-yong

Study on emission stability of Mo-La/sub 2/O/sub 3/ cathode

The Mo-La/sub 2/O/sub 3/ cathode, which possesses the advantages of high strength and good ambient ductility, excellent electron emission ability, low operating temperature and radioactive-free pollution, is a promising cathode for replacing W-ThO/sub 2/ cathode in a variety of vacuum electron devices. However, it was found that the emission current of Mo-La/sub 2/O/sub 3/ cathode electron tubes attenuated with lifetime rapidly. In order to obtain stable emission of Mo-La/sub 2/O/sub 3/ tubes, much effort have been done on the material composition, the carbonizing process and emission mechanism in recent years. The results obtained indicate that the great progress has been made in the emission stability and the lifetime of Mo-La/sub 2/O/sub 3/ cathode tubes. The Mo-La/sub 2/O/sub 3/ cathodes have been successfully used to replace W-ThO/sub 2/ cathodes in FU-6051 electron tubes in China gradually.