| 摘要 |
1,260,221. Cathode materials and processing. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 1 April, 1969 [4 April, 1968], No. 16968/69. Heading H1D. A tubular discharge-heated lamp cathode has on the inside of the tube a layer of metal particles 2 sintered to the base 1 containing between them emissive material 3, the particles being then deformed so as substantially to surround the material. In one form a nickel base is coated with a layer of separated particles of nickel by the process of Specification 995,821 and these are sintered to the base in a furnace. Alkaline-earth oxide, mixed if desired with 1- 10% Ti, Zr, Hf or Th, is then coated on and the whole is rolled to bend the tops of the particles over as shown. The base may be molybdenum, nickel-plated iron or "cathode nickel". The particles may be of Ti, V, Mo, Fe or Cr instead of nickel. |
