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    SCINTILLATION CONDITIONING OF TANTALUM CAPACITORS WITH MANGANESE DIOXIDE CATHODES

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    Date
    2013
    Author
    Fritzler, Thomas
    Advisor
    Pecht, Michael G
    Azarian, Michael H
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    Abstract
    Scintillation testing is a method that activates the self-healing mechanism in tantalum capacitors. In preliminary experiments, the deliberate activation of self-healing yielded up to 27% higher breakdown voltages in weak parts that had an increased risk of ignition failure. This improvement results in a better performance under surge current conditions. This paper demonstrates that scintillation conditioning reduces surge current failures in tantalum capacitors with manganese dioxide cathodes. Tantalum capacitors with MnO2 cathodes from two manufacturers are subjected to scintillation conditioning and compared to non-conditioned populations in a surge current test. To ensure that the activation of the self-healing mechanism has no detrimental effect on the reliability of the parts, a life test is conducted. The results show that the conditioning method increases the breakdown voltage of self-healed tantalum capacitors by up to 25% under surge current conditions, which mitigates the risk of ignition failures. No detrimental effect on the life of the conditioned samples was observed. Additional tests to assess the reliability of tantalum capacitors with manganese dioxide cathodes under simultaneous thermo-mechanical and voltage stresses were performed. Even though these tests are not directly related to scintillation conditioning the study was included as an additional chapter, since it pertains to the general subject of tantalum capacitor reliability.
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    http://hdl.handle.net/1903/14217
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    • Mechanical Engineering Theses and Dissertations
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    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
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