THERMIONIC EMISSION OF Mo-Y2O3 FILAMENT CATHODE
(1.Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083, P. R. China；
2.Department of Materials Science and Engineering,BeijingPolytechnic University, Beijing100022, P. R. China)
2.Department of Materials Science and Engineering,BeijingPolytechnic University, Beijing100022, P. R. China)
Abstract: A new thermionic electron emission material has been studied. The electron emission properties and microstructure of Y-Mo(Mo-Y2O3) wire with content of 3%~5% Y2O3 have been systematically investigated by means of electron tube emission and electron microscope. The results showed that the Y-Mo material has very good electron emission ability, higher emission efficiency and lower operation temperature than those of Th-W cathode, respectively. In addition, Y-Mo cathode electron tube exhibits more stable emission current than that of La-Mo ones.
Key words: Mo Y2O3 cathode thermionic emission