| 摘要 |
<p>1,166,311. Getters. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 5 Jan., 1967 [8 Jan., 1966], No. 761/67. Heading H1D. A getter for use in an electric discharge tube, e.g. a cathode ray tube or a travelling wave tube, initially comprises a mixture of zirconium hydride and tungsten powder and is manufactured by a process which includes the steps of reducing the hydride to metallic zirconium which is subsequently superficially oxidized by exposing it to an oxygen atmosphere at 10<SP>-4</SP> Torr pressure. The zirconium hydride and tungsten powder mixture is first heated, e.g. to 850-900‹ C., in a separate vacuum space to reduce the hydride, the hydrogen evolved being pumped away, then the resulting mixture is subjected e.g. at room temperature to a 10<SP>-4</SP> Torr oxygen atmosphere e.g. for a few hours, so that the grains of zirconium are superficially oxidized. The mixture is then mounted in a discharge tube which is degassed and pumped down and then the getter is heated for about 30 seconds to 800-1000‹ C., either before or after sealing the tube, so that the oxygen diffuses into the grains of zirconium and the getter is activated. A specific example is given.</p> |
