| 摘要 |
PURPOSE:To provide a cathode which improves the distribution of emitted electrons in low operation temperature and emits an emission current in high density stably for a long period by making the cathode out of cathode member which contains Ni, metal having reductive action and an electron emitting agent and is processed into a mirror face after unification. CONSTITUTION:A molded item is produced by mixing (reductive metal-Ni) alloy and (Ba, Sr, Ca) CO3 powder at a specified volume rate, and pressurizing it after sealing in rubber form. The molded item is enclosed in an evacuated glass capsule, and HIP processing is performed at specified temperature and pressure for a specified time. After HIP processing, the sintered and unified product is taken out of the glass capsule, and the electron emission face is processed into a mirror face so as to form a cathode pellet 11. The cathode pellet 11 is inserted into a cathode cap 12 and a cathode sleeve 13, and the periphery and the bottom face are welded for fixing, and then a heater 14 is inserted into the cathode sleeve 13 so as to get a cathode 10. This cathode 10 is excellent in distribution of emitted electrons at low operation temperature, and it can emit electrons in high current density stably for a long period. |
