The Effect of Fiber Thickness and Thickness Uniformity on CV/g Behavior of Ta Ribbon Type Fibers

摘要

This paper describes work performed at Anomet Products on making tantalum fibers and the effect of fiber thickness and uniformity on the normalized capacitance, CV/g (μF·V/g) of anodes made from these fibers. Ta fibers were made by the composite billet process. These fibers have a micro-ribbon type morphology. The dimensions of the fibers are characterized by thickness and width. Anodes made from these fibers were formed to between 100 and 180 V. The normalized capacitance of these fibers depends on the fiber thickness, while the fall-off in normalized capacitance versus formation voltage depends on fiber uniformity. Two types of nonuniformity are typically observed: the thickness differences between individual fibers within the sample and the thickness variation within an individual fiber. Both types of non-uniformity result in a decrease in specific capacitance.