Secondary electron emission coefficient of metal doping W-base alloy cathode

W-Re, W-Sc, W-Zr, W-Y metal alloy cathodes were prepared, with Re, Sc, Zr and Y in metal alloy cathodes having the same mass fraction of 5%. Secondary electron emission coefficient testing results show that Re doped metal alloy cathodes can enhance the coefficient of pure W cathode sintered with W powder in the same preparation environment remarkably. 20%, 10%，6%, 5%, 4% and 3% mass fraction Re doped metal alloy cathodes were researched. 5% Re doped W-Re metal alloy cathode has the biggest maximum secondary electron emission coefficient of 1.8, 80% higher than that of pure W cathode. With the mass fraction of Re reducing, the coefficient of metal alloy cathodes were rising. When the mass fraction of Re dropped to 5%, metal alloy cathode had the biggest coefficient. However, for the mass fraction 4% of Re, the maximum coefficient of the metal alloy cathode dropped to 1.41. For the mass fraction 3% of Re, the maximum coefficient of metal alloy cathodes was only 1.1.