Scandia doped tungsten matrix for impregnated cathode

As a matrix for Sc-type impregnated cathode, scandia doped tungsten with a uniform distribution of Sc2O3 was obtained by powder metallurgy combined with the liquid-solid doping method. The microstructure and composition of the powder and the anti-ion bombardment behavior of scandium in the matrix were studied by means of SEM, EDS, XRD, and in-situ AES methods. Tungsten powder covered with scandium oxide, an ideal scandium oxide-doped tungsten powder for the preparation of Sc-type impregnated cathode, was obtained using the liquid-solid doping method. Compared with the matrix prepared with the mechanically mixed powder of tungsten and scandium oxide, Sc2O3-W matrix prepared with this kind of powder had smaller grain size and uniform distribution of scandium. Sc on the surface of Sc2O3 doped tungsten matrix had good high temperature stability and good anti-ion bombardment capability.