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cathode erosion site distributions in an applied-field magnetoplasmadynamic thruster

Plasma Science and Technology 2020年第9期22卷 59-65页

作者： Peng WU Yibai WANG Yong LI Baojun WANG Kaiyu ZHANG Haibin TANG Jinbin CAO School of Astronautics Beihang UniversityBeijing 100191People's Republic of China Beijng Institute of Control Engineering Beijing 100190People’s Republic of China School of Space and Environment Beihang UniversityBeijing 100191People's Republic of China Key Laboratory of Spacecraft Design Optimization&Dynamic Simulation Technologies Ministry of EducationBeijing 100083People’s Republic of China Laboratory of Space Environment Monitoring and Information Processing Ministry of Industry and Information TechnologyBeijing 100083People's Republic of China

erosion can influence cathode life,and is thus considered to be one of the main factors limiting the application of applied-field magnetoplasmadynamic *** this paper,erosion sites on graphite cathodes are studied so as to identify the influence of applied magnetic field and the ratio of propellant mass flow rate supplied from cathode and *** experiment results show that the application of applied magnetic field can significantly reduce the erosion rate of the cathode compared to that without magnetic *** erosion sites on the cathode vary with the relative position of the convergent-divergent magnetic field,and are mainly distributed in the divergent part of the *** erosion sites on the cathodes are found to be related to the propellant *** decreasing anode mass flow rate enlarges the range of *** results are much helpful for the analysis of cathode erosion site location since they provide evidences of erosion mechanisms and point out the directions for further research.

关键词： electric propulsion applied-field magnetoplasmadynamic thruster cathode erosion magnetic field propellant mass flow rate

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cathode erosion of Graphite and Cu/C Materials in Airarcs

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Journal of Wuhan University of Technology(Materials Science) 2012年第1期27卷 18-20页

作者： Zhang Chengyu Qiao Shengru Liu Yiwen Yang Zhimao Wang Yaping Yong Guo Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical UniversityXi’an710072China School of Science Xi’an Jiaotong UniversityXi’an710049China Department of Chemistry Datong UniversityDatong037000China

cathode erosion of graphite and Cu/C was studied in direct current arcs, which were ignited between two electrodes comprised of two kinds of carbon materials and a tungsten anode in air. The arced zones on the cathode surface were investigated by a scanning electron microscope. Also, the cathode erosion rates of the investigated materials were measured. The results show that two distinct zone can be seen on both cathodes. The eroded area was located at the zone just opposite to the anode and surrounded by a white zone. The arced surface on the Cu/C containing 9.3 % Cu is rougher than that of the pure graphite. Many particles with various sizes distributed on the Cu/C. The vaporization of Cu can lower the surface temperature and reduce the cathode erosion. Therefore, the cathode erosion rate of the Cu/C is lower than that of the pure graphite.

关键词： Cu/C composite graphite air arc cathode erosion

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