| 摘要 |
<p>PURPOSE:To enhance the interlocking property of a quick movable type impregnated cathode, by providing previously an opening at the place where a cathode made of a metallic plate with a high melting temperature as a heater is desired to form, forming a metallic powder with a high melting point into said opening in order to sinter, so that said powder does not separate from said opening, and then impregnating said metallic plate with an electron emissive material. CONSTITUTION:An opening smaller than in size a cathode is previously formed at the place where a cathode made of a tungsten plate 6 is desired to form. Next, a metallic powder with a high melting point such as tungsten or molybdenum is pressed from both sides of the tungsten plate 6 in order to form a top part and a bottom part, each having larger diameter than that of said opening. Afterwards, for instance, said powder is sintered at 2,000-2,600 deg.C in a hydrogen furnace in order to contract a molded body 7 made of the metallic powder with a high melting point. Then, the sintered body 7 is impregnated with the electron emissive material and thereby a quick movable type impregnated cathode can be obtained. Consequently, the impregnated cathode directly adhered to said metallic plate with a high melting point, so the temperature of the impregnated cathode is immediately raised and the quick movability of the cathode is enhanced.</p> |
