Title: Capacitor grade tantalum power, capacitor made therefrom and use in producing capacitor anode
Application Number: 99105138 Application Date: 1994.04.15
Publication Number: 1236177 Publication Date: 1999.11.24
Approval Pub. Date: 2004.03.24 Granted Pub. Date: 2004.03.24
International Classifi-cation: H01G9/042
Applicant(s) Name: Cabot Corp. Address:
Inventor(s) Name: Chang;Hong Ju
Attorney & Agent: fan menge
Abstract:
    A process for producing capacitor grade powder, electrodes, and finished capacitors therefrom having reduced electrical leakage characteristics. The powder is prepared by reacting Group V-B base materials with quantities of between 500 to 7000 ppm of nitrogen and 700 to 3000 ppm of oxygen. Electrical leakage is reduced by at least 28% for electrodes anodized at 100 volts or greater in comparison with electrodes and finished capacitors made from undoped materials. A range of specific charge of up to 25,000 uFV/g is achieved for sintering temperatures of 1400 DEG C. to 1800 DEG C.
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