| 摘要 |
1497371 Electrolytic capacitors STANDARD TELEPHONES & CABLES Ltd 20 May 1976 20879/76 Heading H1M An electrolytic capacitor anode comprises a pressure compacted, non-sintered porous body of valve metal coated particles whose core material is electrically insulating and is harder than the valve metal coating. The core material may be alumina, silicon carbide, titanium dioxide, silicon dioxide or glass powder in a size range 9 to 21 Ám. The coating metal may be tantalum, niobium or an alloy thereof, optionally doped with up to 1% molybdenum. Coating may be carried out by passing, e.g. tantalum pentachloride into a fluidized bed of the core particles. Compaction may be effected using dies and punches and requires a binder such as camphor which is subsequently removed, or isostatic compaction may be employed. The capacitor is completed in known fashion by anodizing, applying a semi-conductive coating, then graphite and silica connection layers. |
