| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Mogeritsch, Johann Peter
Montanuniversität Leoben
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2023Hypo-peritectic TRIS–NPG in a stationary temperature gradientcitations
- 2022Determination of Cooling Rate and Temperature Gradient during Formation of Cathode Spot Craters in a Vacuum Arccitations
- 2022On/off directional solidification of near peritectic TRIS-NPG with a planar but tilted solid/liquid interface under microgravity conditions.citations
- 2022In Situ Observation of Coupled Growth Morphologies in Organic Peritectics Under Pure Diffusion Conditionscitations
- 2021Rapid solidification and metastable phase formation during surface modifications of composite Al-Cr cathodes exposed to cathodic arc plasmacitations
- 2020Investigation of Peritectic Solidification Morphologies by Using the Binary Organic Model System TRIS-NPGcitations
- 2019Calibration of Numerical and Determination of Physical Parameters for the Organic Model System TRIS-NPG
- 2018Investigation on Peritectic Layered Structures by Using the Binary Organic Components TRIS-NPG as Model Substances for Metal-Like Solidification
- 2018Feuerverzinkung
- 2018Investigation on the Binary Organic Components TRIS-NPG as Suitable Model Substances for Metal-Like Solidification
- 2018Investigation on the Liquid Flow ahead of the Solidification Front During the Formation of Peritectic Layered Solidification Structure
- 2017Phase-field modelling of ternary eutetic solidification in hot dip galvanization
- 2012Investigation on Peritectic Solidification using a Transparent Organic System
- 2009Thermal stability of a binary non-faceted/non-faceted peritectic organic alloy at elevated temperaturescitations
Places of action
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article
Determination of Cooling Rate and Temperature Gradient during Formation of Cathode Spot Craters in a Vacuum Arc
Abstract
Due to the extreme thermal conditions and short lifetimes, experimental exploration of cathode spots in vacuum arcs is very difficult. The intensive heat in the cathode spot is believed to be generated by ion bombardment and by Joule heating. However, thermal conditions occurring inside the re-melted material in craters created by cathode spots are not accurately known. During the exposure to cathodic arc plasmas, an Al-Cr cathode’s surface was locally melted by successive ignition and extinction of cathode spots. The melted layer, that quickly solidified, was characterized by the formation of several thin layers with a thickness of a few micrometers that were stacked on top of each other. The corresponding solidification patterns displayed cellular and dendritic microstructures. A phase field-based model was used to simulate and determine the thermal process conditions that led to the dendritic structures observed within the re-melted layer. Different combinations of cooling rates and temperature gradients were numerical explored to determine the most probable thermal conditions under which the cathode material re-solidifies. The results showed that the material in the vicinity of the cathode spot crater re-solidified under the condition of a cooling rate of about 3 × 105 K/s and a temperature gradient of about 6 × 107 K/m. These results constitute valuable data for the validation of numerical models dedicated to cathode spot formation.