Ni-Ba含浸型陰極の諸特性

抄録

A piece of porous nickel, 20_??_40% in porosity, is impregnated with Ba(OH)₂ in hydrogen atmosphere, the impregnation extending to 65_??_75°0 of the pores. This being used as a cathode, work function of 2.2 eV and current density of 0.05 A/cm² or more were obtained. Though the time required for evacuation was 3_??_4 times more than that in the case of sprayed oxide coated cathode, stability against ionic and electronic bombardments was far better. By the control of the grain size of nickel powder, molding pressure and sintering temperature, the cathode can be made to suit to various purposes. The emission obtained was rather small, but its increase is expected by the addition of proper reducing agent.