Full tantalum insulator cover and its manufacturing process

Abstract

The invention discloses a full-tantalum insulator cover and a manufacturing technology thereof. The full-tantalum insulator cover is a flat part formed by integrally processing a tantalum board material, comprises a center hole and flangings, and is characterized in that bosses are arranged at the periphery of the center hole; the bosses are formed by adopting a cold extrusion technology; a distance from the upper surface to the bottom surface of each boss is the thickness of the tantalum board material; and liquid injection holes are formed around the center hole. According to the full-tantalum insulator cover used for manufacturing a tantalum capacitor and the manufacturing technology of the full-tantalum insulator cover, the full-tantalum insulator cover is free from strain and residual internal stress, so that the sealability of a capacitor anode and the center hole of the full-tantalum insulator cover is ensured, liquid leakage is avoided, a defective rate of tantalum capacitor production is decreased, and liquid injection of the capacitor is facilitated.

Description

technical field [0001] The invention relates to the field of all-tantalum capacitors, in particular to an all-tantalum insulator cover for manufacturing all-tantalum capacitors and a manufacturing process for the all-tantalum insulator cover. Background technique [0002] The texture of tantalum is very hard, and tantalum is malleable and can be drawn into thin filaments to make thin foil. Its coefficient of thermal expansion is small. Tantalum has very good chemical properties and is extremely resistant to corrosion. No matter under cold or hot conditions, it does not react to hydrochloric acid, concentrated nitric acid and "aqua regia". It can be used to make evaporation vessels, etc., and can also be used as electrodes, rectifiers, electrolysis, and capacitors for electronic tubes. [0003] Tantalum forms a stable anodic oxide film in acidic electrolyte. Electrolytic capacitors made of tantalum have the advantages of large capacity, small size and good reliability. Man...

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Problems solved by technology

[0004] At present, the all-tantalum insulator cover of the existing all-tantalum capacitor has a round hole in the middle for accommodating the anode of the capacitor. The round hole is processed by flanging. After processing, the wall thickness becomes thinner, and the mouth is uneven, and process cracks appear at the flanging. , when it is subsequently used to manufacture all-tantalum capacitors, it is necessary to use additional devices to ensure the sealing of the capacitor anode and the center hole of the all-tantalum insulator cover. Due to the existence of strain, residual internal stress, etc., its structure is unreliable and the sealing performance is poor. Manufactured tantalum capacitors are prone to liquid leakage and have a high rate of defective products

In addition, there is no special injection hole for the injection of tantalum capacitors, which has restrictions on the manufacturing process

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