| 摘要 |
1328859 Electrolytic capacitors UNION CARBIDE CORP 11 Nov 1970 [12 Nov 1969] 53536/70 Heading H1M The solid electrolyte 14 in an electrolytic capacitor 10 is coated with a layer 15 of graphite then with a lamellar layer 16, 0À0002 to 0À003 inches thick, of substantially oxide-free copper. The copper coating may be applied by introducing a stream of finely divided, i.e. passing a 325 mesh, copper particles into a heated stream of an inert gas, e.g. argon in a plasma arc torch (34) (Fig. 3, not shown). The effluent comprises at least partially melted copper particles which impinge on capacitor (33) to deposit as microscopic flakes. A stream of argon from coaxial jet (37) shrouds the effluent to prevent oxidation, or deposition may be carried out in an oxygen-free chamber. A silver layer may be applied prior to coating with copper and a solder layer 17 applied over the copper layer. The capacitor can then be secured to a printed circuit board by reflow soldering (Fig. 2, not shown), or it can be encapsulated or encased as in Fig. 1. |
