| 摘要 |
1,199,048. Electrolytic capacitors. INTERNATIONAL STANDARD ELECTRIC CORP. 9 Nov., 1967 [16 Nov., 1966], No. 51072/67. Heading H1M. In the manufacture of a solid electrolytic capacitor the anodized and semi-conductor coated anode is immersed in a metal melt heated to a temperature of at least 150‹ C., and a direct voltage of the same polarity as and not exceeding the value of the nominal D.C. voltage of the capacitor is applied between the anode and the melt. The electrical properties of the capacitor, in particular a niobium or tantalum capacitor, are stated to be improved without being rendered more voltage dependent. The metal melt may be an alloy of lead with tin and the coating remaining on the capacitor body when withdrawn from the melt may constitute the counter-electrode. When the semi-conductor coating is applied as several layers, e.g. of manganese dioxide by pyrolysis of manganous nitrate, the melt treatment may take place after each application. Preferably, however, the semi-conductor layer is first coated with a graphite and silver layer and the subsequent low m.p. metal layer forms a conductive connection to which a lead may be readily soldered. |
