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- W1658854796 abstract "Erosion of material caused by electrical discharges takes place in many technical applications. Particularly, in spark plugs, the durability is mainly determined by the electrode erosion caused by ignition discharges. A better understanding of the wear mechanisms will help in developing new electrode materials with enhanced resistance against spark erosion.In this work, different aspects of the complex interaction between the plasma of the ignition discharge and the electrode are investigated based on experimental observations and simulations. The discharge mode behavior is quantitatively analyzed with regard to the arc and glow phase fractions for different electrode materials and conditions of pressure and gas. The influence of these parameters on the discharge is discussed. This work especially focuses on the formation of microscopic erosion craters on the electrode surface. Their morphology and microstructure are characterized by means of FIB/SEM dual beam techniques. The depth of modifications and the extent of the molten region are determined. To complete these experimental observations, thermal analysis of the crater formation is performed using analytical models and FEM simulations. Characteristic values of time, power density and current involved in the crater formation are estimated. These values are related to the electrical characteristic of the spark, and the effects of the discharge phases on the electrode surface degradation are discussed. Die Erosion von Materialien, die von einer elektrischen Entladung hervorgerufen wird, tritt in zahlreichen technischen Anwendungen auf. Auch die Lebensdauer einer Zundkerze wird durch die von den Zundentladungen verursachte Erosion an Elektrodenmaterialien masgeblich bestimmt. Ein besseres Verstandnis der Verschleismechanismen ist von groser Bedeutung, um masgeschneiderte Werkstoffe mit verbessertem Funkenerosionsverhalten zu entwickeln.In dieser Arbeit werden verschiedene Aspekte der komplexen Wechselwirkung zwischen dem Plasma der Zundentladung und der Elektrode anhand von experimentellen Beobachtungen und Simulationen erforscht. Das Entladungsverhalten (Bogen- und Glimmanteil) wird fur verschiedene Elektrodenwerkstoffe, Gas-, und Druckbedingungen quantitativ untersucht. Die Morphologie und Mikrostruktur von Erosionskratern werden mit Hilfe von FIB/REM Dual-Beam-Techniken charakterisiert. Die mikrostrukturellen Veranderungen des Materials unterhalb der Oberflache und insbesondere der Schmelzbadgrose werden bestimmt. Zur Erganzung der experimentellen Beobachtungen, wird eine thermische Analyse der Kraterbildung mittels analytischen Modellen und FEM-Simulationen durchgefuhrt. Charakteristische Werte des Kraterbildungsprozesses wie z.B. die Warmezufuhr, der Strom, und die Wechselwirkungsdauer werden bestimmt und in Bezug auf die verschiedenen Phasen der Zundentladung diskutiert." @default.
- W1658854796 created "2016-06-24" @default.
- W1658854796 creator A5013714057 @default.
- W1658854796 date "2009-01-01" @default.
- W1658854796 modified "2023-09-27" @default.
- W1658854796 title "Plasma-material interaction and electrode degradation in high voltage ignition discharges" @default.
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- W1658854796 doi "https://doi.org/10.22028/d291-22625" @default.
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