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Abstract
Failure mode and effect analysis (FMEA) is an important step in the reliability assessment process of electric components. It provides knowledge of the physics of failure of a component that has been subjected to a given stress profile. This knowledge enables improvement of the component robustness and durability and serves as verification that failure- and degradation mechanisms remain the same at different stress levels during accelerated testing.
In this work we have used Kelvin probe force microscopy (KPFM) to analyze metallized film capacitors with the purpose of determining the degradation mechanism(s) they suffered from accelerated testing. We have prepared film capacitors for analysis by micro-sectioning and verified the quality of the preparation procedure using optical and atomic force microscopy.
The potential distribution in the layer structure (alternating 7 µm thick dielectric and 50-100 nm thick metal) of a new capacitor was used as reference. KPFM measurements on the degraded capacitors showed a change in contact potential difference from -0.61V on the reference capacitor to 3.2V on the degraded ones, indicating that corrosion of the metallization had happened. Studies also showed that some of the metallization stripes had lost contact to the end-spray.
Thus, it is shown that the surface electric potential distributions on micro-sectioned film capacitors can be obtained through KPFM analysis. We have, from KPFM measurements, shown that the degraded capacitors under investigation had suffered from metallization corrosion and some degree of end-spray detachment. The results obtained in this work, along with results from the literature, demonstrate the usefulness of KPFM as a tool for FMEA.
In this work we have used Kelvin probe force microscopy (KPFM) to analyze metallized film capacitors with the purpose of determining the degradation mechanism(s) they suffered from accelerated testing. We have prepared film capacitors for analysis by micro-sectioning and verified the quality of the preparation procedure using optical and atomic force microscopy.
The potential distribution in the layer structure (alternating 7 µm thick dielectric and 50-100 nm thick metal) of a new capacitor was used as reference. KPFM measurements on the degraded capacitors showed a change in contact potential difference from -0.61V on the reference capacitor to 3.2V on the degraded ones, indicating that corrosion of the metallization had happened. Studies also showed that some of the metallization stripes had lost contact to the end-spray.
Thus, it is shown that the surface electric potential distributions on micro-sectioned film capacitors can be obtained through KPFM analysis. We have, from KPFM measurements, shown that the degraded capacitors under investigation had suffered from metallization corrosion and some degree of end-spray detachment. The results obtained in this work, along with results from the literature, demonstrate the usefulness of KPFM as a tool for FMEA.
Originalsprog | Engelsk |
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Titel | 61st Reliability and Maintainability Symposium (RAMS), 26-29 Jan. 2015, Palm Harbor |
Antal sider | 6 |
Forlag | IEEE |
Publikationsdato | 2015 |
ISBN (Trykt) | 978-1-4799-6702-5 |
DOI | |
Status | Udgivet - 2015 |
Begivenhed | 2015 Annual Reliability and Maintainability Symposium (RAMS) - Palm Harbor, FL, USA , USA Varighed: 26 jan. 2015 → 29 jan. 2015 |
Konference
Konference | 2015 Annual Reliability and Maintainability Symposium (RAMS) |
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Land/Område | USA |
By | Palm Harbor, FL, USA |
Periode | 26/01/2015 → 29/01/2015 |
Fingeraftryk
Dyk ned i forskningsemnerne om 'Electric field mapping inside metallized film capacitors'. Sammen danner de et unikt fingeraftryk.Projekter
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Center Of Reliable Power Electronics (CORPE)
Blaabjerg, F., Munk-Nielsen, S., Pedersen, K. & Popok, V.
01/04/2011 → 31/12/2016
Projekter: Projekt › Forskning