| 摘要 |
<p>839,504. Coating electrical conductors by electrophoresis. SIEMENS EDISON SWAN Ltd. Dec. 15, 1958 [Jan. 10, 1958], No. 1039/58. Class 41. An adherent coating of electron-emissive material is formed on an electric conductor by immersing the conductor in a liquid vehicle containing the material in suspension and also a solution of a polymerized alkyl methacrylate, applying a potential between the conductor and an electrode in contact with the vehicle, and depositing the material and the polymer simultaneously on the conductor by electrophoresis. The method may be applied to the formation of directly heated cathodes; a tungsten wire 1, Fig. 1, is passed through a bath 2 containing a solution of a polymethacrylic ester in xylene and acetone having alkaline earth carbonates in suspension, and connected to the negative pole of a D.C. supply of which the positive pole is connected to the metal of the bath or to an electrode 6 therein. The wire then passes through a heated drying chamber 10. The member 9 consists of a seal formed by a small pool of mercury resting on a restricted opening in a glass liner mounted in a metal tube.</p> |
