CHEMICAL CONVERSION BODY FOR NIOBIUM CAPACITOR POSITIVE ELECTRODE, AND PRODUCTION METHOD THEREFOR
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United States of America Patent
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Nov 26, 2015
app pub date -
Dec 26, 2013
filing date -
Dec 27, 2012
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Abstract
A chemical conversion body, electrolytic capacitor and production method are disclosed. The capacitor contains a chemical conversion body obtained by sintering a niobium granulated product. The sintered product is obtained by mixing niobium hydride and a niobium-aluminum intermetallic compound, pulverizing the mixture, and allowing the mixture to agglomerate by heat treatment to thereby form a granulated product; sintering the granulated product; and subjecting the sintered body to electrolytic oxidation to form a dielectric layer on the surface of the sintered body; in which chemical conversion body the sites of aluminum localization having a size of 0.1 μm to 0.5 μm are scattered in a depth of less than 0.06 μm from the surface of the dielectric layer. Nb2Al and Nb3Al can be preferably used as a niobium-aluminum intermetallic compound.
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