| 摘要 |
<p>PURPOSE:To obtain a cathode substrate capable of producing a thermal electron emission type cathode with a low cost and the excellent characteristics and reliability by adhering metallic powders around a heater wire formed in a desired cathode shape substrate by electrodeposition or spraying so that an electron radioactive material can be retained in gaps formed by metallic powders. CONSTITUTION:As electrodeposition is continued, tungsten powders 7 are adhered in protrusions and recesses around a heater wire 1. When a necessary quantity is adhered to form a powder layer, it is heat treated and sintered in a hydrogen or vacuum atmosphere at 1,000-2,000 deg.C for about 20min, then the metallic powders are solidified. An oxide material 9 is coated or filled by spraying in the recesses 8 formed with solidified nickel powders, then an oxide cathode with the excellent characteristics and reliability is obtained even if the cathode shape is complicated such as a coil-like shape.</p> |
