| 摘要 |
PURPOSE:To reduce the decrease in an electron emission current during the life of a cathode, by mixing a powder of a metal with a prescribed lower alcohol ester to prepare a suspension, and by coating the main surface of an Ni base with the suspension, and sintering them in a reducing atmosphere. CONSTITUTION:1 part by volume of a metal Ni powder of 7-8mum in mean grain diameter is mixed with 2.5 parts by volume of a mixed liquid consisting of 20wt% of an isobutyl metaacrylate and the rest of amyl alcohol, to prepare a metal powder suspension 10. The main surface of an Ni base 1 is coated with the suspension 10 by using a punched metal plate 6 and a squeegee 11. The main surface and the suspension 10 coating it are heated at a temperature of 800 deg.C under hydrogen for 10min to make a sintered layer which has a large void ratio and contains less residues. The decrease in an electron emission current during the life of a cathode is thus reduced. |
