An oxygen-free high-conductivity copper cathode was tested in a 50 MW arc heater with working currents up to 2600 A and power up to 13.6 MW by using air as the test gas. After testing, the structure of the ablated cathode was measured and analyzed. The erosion rate of the cathode was 2.46 × 10 5    g / C . An arc foot area and an oxide layer area appeared and were located at the end of the cathode. The arc foot area was covered with molten signs, ablated pits, and deformations. The oxide layer was composed of parallel traces that were generated by melted liquid. The grain size at the cathode’s thinnest wall thickness was refined from the original 150 to 110 μ m due to recrystallization. The grain size increased and the phenomenon of abnormal grain growth appeared, with an increase of the distance from the arc foot. The Vickers hardness agreed well with the grain size. The erosion mass loss includes not only vaporization removal but also melting removal via shear force generated by swirl air, considering the erosion rate and ablated phenomena. A modified particle ejection model is proposed to describe the erosion mechanism that agrees with the ablated phenomena of the test.


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    Title :

    Copper Cathode’s Ablated Structure Operated in a 50 Megawatt Arc Heater


    Contributors:
    Yuan, Jie (author) / Long, Yongsheng (author) / Zhu, Tao (author) / Liu, Yuan (author) / Yin, Dongdi (author) / Yang, Bin (author)

    Published in:

    Publication date :

    2019-06-24


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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