Investigation of Electrode Erosion Mechanism of Multi-Phase AC Arc by High-Speed Video Camera

11th Asia Pacific Conference on Plasma Science and Technology;25th Symposium on Plasma Science for Materials

Tanaka, M.^1 ; Ikeba, T.^1 ; Liu, Y.^1 ; Choi, S.^1 ; Watanabe, T.^1

Department Environmental Chemistry and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8502, Japan^1

关键词: Electrode surfaces;    Electrode temperature;    Erosion mechanisms;    Glass melting technology;    High speed camera systems;    High speed video cameras;    Oxygen concentrations;    Tungsten electrodes;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/441/1/012015/pdf
DOI  :  10.1088/1742-6596/441/1/012015

来源: IOP

【 摘 要 】

A multi-phase AC arc has been applied to the glass melting technology. However, the electrode erosion is one of the most considerable issues to be solved. In order to investigate the erosion mechanism of the multi-phase AC arc, the combination of the high-speed video camera and the band-pass filters was introduced to measure the electrode temperature. Results indicated the tip temperature of the electrode surface in the 12-phase arc was lower than that in the 2-phase arc, while erosion rate in 12-phase arc was higher than that in the 2-phase arc. Furthermore, the dynamic behaviour of the vapours in the arc was investigated by using the same high-speed camera system. The tungsten electrode mainly evaporates at the anodic period during AC cycle. The oxygen concentration in the arc increases with larger number of the phases, resulting in the higher erosion rate in the 12-phase arc.