Production Engineering Measure for the Improved Reliability of Capacitors, Fixed, Solid Electrolyte, Tantalum High-Reliability 10mfd-20 Volt Capacitors

摘要

The primary areas of process improvement studies were: (1) anodizing and re-forming; (2) carbon and silver coating; and (3) ageing. Tests of significance were performed on twelve combinations of process variables which were studied during this period; the variables were: (1) re-form voltages; (2) the number of carbon coats; and (3) carbon curing temperatures. Two primary conclusions derived from the work are: (1) Lot 1939, with the higher re-form voltage compared with Lot 1940, has a significantly lower average capacitance and dissipation factor, and somewhat higher d-c leakages; and (2) capacitors with 2-carbon coats and the 150C cure have lower average d-c leakages compared with the 125C cure on Lot 1940, whereas the converse is true for Lot 1939. (Author)