PRODUCTION ENGINEERING MEASURE FOR IMPROVED RELIABILITY OF SOLID TANTALUM ELECTROLYTIC CAPACITORS.
Quarterly progress rept. no. 3, 1 Jan-31 Mar 64,
LINDE DIV UNION CARBIDE CORP CLEVELAND OHIO
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This report presents the results of the first three months of the one-year engineering study for the production of high reliability 22 microfarads, 50 volt solid tantalum electrolytic capacitors. The parametric data and reliability behavior are presented for all capacitor groups produced during the quarter. Some of these lots have been successfully graded, by accelerated life testing, to the target failure rate of 0.001 per one thousand hours. Additional physical and chemical data, and photomicrographs of the various vendor tantalum powders are presented. Experiments on anodic formation, MnO2 impregnation, and reformation were performed during the quarter. The results of these experiments are discussed. A relationship between formation current density and finished component dc leakage is presented. Experiments on constant power formation are discussed. Critical process variables in the MnO2 impregnation process are identified. The program for the next quarter is discussed. Author