Temperature Modeling and Verification of High-voltage Micro-arc with a Tungsten Electrode
In order to improve the success rate of the preparation of monolithic micro tungsten ball tips,the high-voltage micro-arc was studied during the preparation processes.A multi-physics field coupled simulation model of tungsten-pole high-voltage micro-arc was established to calculate the arc temperature distribution at electrode spacing of 0.5～2.0 mm and voltage of 1～12 kV.The simulation results were then subjected to least-squares fitting,and a mathematical model between the arc tem-perature and the discharge parameters was obtained.Finally,the mathematical model was validated by building a spectral temperature measurement system based on the Boltzmann graphing method.The results show that the arc is elliptically distributed,and there is a high temperature barrier in the near-anode region,and the anode temperature is much lower than that of the cathode temperature.The arc temperature has a parabolic relationship with the voltage and electrode spacing.The average relative error between the model calculation results and the experimental results is as 3.3％.The model may be used to calculate the arc temperature for controlled preparation of the tungsten ball tips.
arc temperaturemagnetogas dynamicsBoltzmann graphing methodmicro tungsten ball tip
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