Societe Lignes Telegraphiques Et Telephoniques

Societe Lignes Telegraphics Et Telephoniques

Jean Vasseux

Balint Escher

Dominique Prince

Michele Moulin

Accelerated ageing of solid electrolyte tantalum capacitors in batches by immersion of the capacitors in a semiconducting powder contained in a conductive receptacle connected to one terminal of a d.c. voltage source, the other terminal of which is connected to the anode leads of the capacitors. The voltage of the source is between 1.2 and 1.8 the capacitor rated voltage. The receptacle is maintained between 25.degree. C. and 180.degree. C. Ageing lasts for at least two hours.

Process for the manufacture of tantalum solid electrolyte capacitors

The anodization of sintered anodes for tantalum capacitors is carried out in two successive steps separated by a cleaning step in an acid bath. In a preferred variant of the process both the first anodization and the cleaning are performed on batches of anodes which are individually sorted and mounted on current carrying bars before the second anodization step. The direct leakage current of capacitors made from anodes anodized according to the invention is substantially lower than that of capacitors with prior art anodes. The capacitors are also less sensitive to temperature.

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Paris, France

Jean Vasseux