Abstract
Arc cast Cu-Ta and powder processed Al-Ta and Al-Nb composite alloys have been examined as potential materials for making electrolytic capacitors. These two phase alloys can be severely cold-worked, deformation-processed, to produce Ta surface areas considerably larger than those possible with the powder processing used in current Ta capacitors. The three alloys were deformation-processed into sheet and rod form and then processed through anodization, electrolyte formation and cathode fabrication steps to make prototype capacitors. The capacitors were tested for capacitance, effective series resistance and leakage. The figure of merit,CVg−1, (capacitance × voltage per gram) values obtained closely approached those of currently manufactured capacitors but d.c. leakage values were unacceptably high using a solid electrolyte. To realize the full potential of this new method for fabricating Al-Ta capacitors further research is required to improve the deformation of the Ta powders and to find methods of anodization and solid-state electrolyte formation capable of maintaining oxide film integrity.
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