| 摘要 |
<p>1,256,147. Electrolytic capacitors. P. R. MALLORY & CO. Inc. 12 Feb., 1969 [14 Feb., 1968], No. 7685/69. Heading H1M. [Also in Division C7] Stainless steel member 10, forming part of the glass-metal seal for can 13 of a wet electrolytic capacitor (Figs. 4, 5, not shown), has a coating 11 which forms a barrier to diffusion of material to the stainless steel and a further coating 12 of solderable material whereby the seal is rendered solderable, as at 14, to the can. Coating 11 may be electroplated nickel, chromium or cobalt. Coating 12 may be an alloy of silver with gold, palladium, platinum, rhenium or osmium. The silver may be replaced by copper where sulphuric acid is not present. Layer 12 may be applied by electroplating a silver layer then a layer of the second metal and heating to 800-950‹ C. to alloy the layers, and the glass melting step can take place simultaneously. Alternatively the constituents of layer 12 can be co-deposited. The can metal may be silver, platinum, palladium or gold or a metal plated with one of these. A stainless steel can may be made solderable in the same way as the seal member, and if each is formed with separate layers of gold and silver they may be joined without the use of solder by heating to alloy the gold and silver (Fig. 3, not shown).</p> |
