The effect over capacitance properties of surfactants used in Mn(NO 3)2 impregnation process in high charge tantalum powders

Juan Jose Torres, Miguel Esquivel, Juan C. Perez, Hector Barrientos, Tomás Sánchez, Ana Pimentel, Cristina Mota-Caetano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The manganese dioxide has been used since several years ago like a counter electrode in the tantalum capacitor fabrication. It has been reported that the additions of surfactants reduce the interfacial tension (liquid/solid interface) and help to improve the impregnation process. The impregnation with a non-ionic surfactant in tantalum pellets made from high CV powders was investigated at 30-60°C and concentrations of 0,01-0,1% wt. The influence of the surfactant in the MnO2 coverage was electrically characterized and the surfactant influences in the pyrolysis condition was analyzed with Differential Thermal Analysis and Scanning Electron Microscopy. A recovery in capacitance (∼10%) was detected for under treatment part types with 100 and 320 μF. The surfactant concentration into the solution is the main factor for the capacitance recovery and the electrical performance. The best capacitance recovery and electrical performance was obtained with 0.05% wt. of surfactant.

Original languageEnglish
Title of host publicationTMS 2009 - 138th Annual Meeting and Exhibition - Supplemental Proceedings
Pages573-579
Number of pages7
Volume3
Publication statusPublished - 1 Oct 2009
EventTMS 2009 - 138th Annual Meeting and Exhibition - San Francisco, CA, United States
Duration: 15 Feb 200919 Feb 2009

Conference

ConferenceTMS 2009 - 138th Annual Meeting and Exhibition
CountryUnited States
CitySan Francisco, CA
Period15/02/0919/02/09

Keywords

  • Impregnation
  • Manganese dioxide
  • Surfactant

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