Determination of the cathode erosion and temperature for the phases of high voltage discharges using FEM simulations |
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| Affiliation: | 1. Functional Materials, Department of Materials Science, Saarland University, Building 22, 7. Stock, P.O. Box 151150, D-66041 Saarbrücken, Germany;2. Robert Bosch GmbH, Dept. AA-SF/ENS, P.O. Box 300220, 70442 Stuttgart, Germany;1. College of Chemistry and Material Science, Key Laboratory of Inorganic Nano-materials of Hebei Province, Hebei Normal University, No. 20 Rd. East of 2nd Ring South, Yuhua District, Shijiazhuang City, Hebei Province 050024, PR China;2. Department State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian City, Liaoning Province 116024, PR China;3. Department of Physical and Analytical Chemistry, Uppsala University, Box 259, SE?751 05 Uppsala, Sweden;1. Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;2. School of Engineering and Mathematical Sciences, City University London, Northampton Square, EC1V 0HB London, United Kingdom;3. Embraer S.A., 12227-901 São José dos Campos, Brazil |
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| Abstract: | A discharge produces an energy input in the cathode material, which causes the erosion of the material surface. The principal mechanism of erosion is the formation of craters mainly due to melting. From calorimetric results published in the literature, the amounts of energy delivered to the cathode for the different phases of the discharge (breakdown, arc and glow discharge) were calculated. A FEM model was developed to simulate the temperature distribution and the phase transitions, which allows the definition of molten and evaporated zones. These zones were compared with the volumes of craters done in Pt-samples at air with pressures ranging between 1 and 9 bar and static electrode gaps of 2 mm. The breakdown energy is enough to melt an amount of material, which is responsible for the formation of very flat craters. The formation of deeper overlapped craters observed in experiments can not be produced during the breakdown; they are produced by the arc phase of the discharge. The assumption of the crater area as the area for the energy exchange between plasma and material gives the best results in the simulation. The glow discharge produces only a light heating of the cathode, without any significant erosion. |
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