影响环形微阴极电弧推力器寿命的因素研究

为了研究影响环形微阴极电弧推力器寿命的因素，首先分析了可能的因素，接着通过试验研究了电流参数对阴阳极间电阻的影响，不同功率下的推力器热性能以及功率大小对绝缘体腐蚀的影响。试验结果表明，为了延长推力器的寿命，需要控制推力器较大的放电电流，使得阴阳极间电阻动态平衡，维持在0.5~10 kΩ；需要选择合适的放电功率，功率阈值应考虑各部件材料的高温承受能力；另外，绝缘体的腐蚀是制约推力器寿命的主要因素，降低放电功率有助于减缓该腐蚀。

Study on Factors Affecting Lifetime of Ring Electrodes Micro Cathode Arc Thruster

In order to study the factors affecting the lifetime of the ring electrodes micro-cathode arc thruster, firstly possible factors are analyzed. Then the influence of the current parameters on the resistance between the cathode and the anode, the thermal performance of the thruster under different powers and the influence of the power on the erosion of insulator are studied through experiments. The experimental results show that for the extension of the lifetime of the thruster, it is necessary to control the larger discharge current of the thruster, so that the resistance between the cathode and the anode is dynamically balanced and maintains at 0.5-10 kΩ, and to select the appropriate discharge power. The high temperature withstanding capacity of each material should be considered in the power threshold. Additionally, the erosion of insulator is the main factor limiting the lifetime of the thruster, and reducing the discharge power helps to slow down the erosion.