NTRS - NASA Technical Reports Server

Back to Results
Deformation of Cases in High Capacitance Value Wet Tantalum Capacitors under Environmental StressesInternal gas pressure in hermetic wet tantalum capacitors is created by air, electrolyte vapor, and gas generated by electrochemical reactions at the electrodes. This pressure increases substantially with temperature and time of operation due to excessive leakage currents. Deformation of the case occurs when the internal pressure exceeds pressure of the environments and can raise significantly when a part operates in space. Contrary to the cylinder case wet tantalum capacitors that have external sealing by welding and internal sealing provided by the Teflon bushing and crimping of the case, no reliable internal sealing exists in the button case capacitors. Single seal design capacitors are used for high capacitance value wet tantalum capacitors manufactured per DLA L&M drawings #04003, 04005, and 10011, and require additional analysis to assure their reliable application in space systems. In this work, leakage currents and case deformation of button case capacitors were measured during different environmental test conditions. Recommendations for derating, screening and qualification testing are given. This work is a continuation of a series of NEPP reports related to quality and reliability of wet tantalum capacitors.
Document ID
Acquisition Source
Goddard Space Flight Center
Document Type
Teverovsky, Alexander
(ASRC Federal Space and Defense Greenbelt, MD, United States)
Date Acquired
December 2, 2016
Publication Date
November 30, 2016
Subject Category
Electronics And Electrical Engineering
Report/Patent Number
Funding Number(s)
Distribution Limits
Public Use Permitted.
Tantalum Capacitors
Space Applications
leakage currents
No Preview Available