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| Degradation of Satellite Rykan Wires Irradiated by Electrons of Different Energies |
| Received:September 06, 2019 Revised:November 13, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.03.002 |
| KeyWord:Rykan wire electrical properties mechanical properties electron irradiation |
| Author | Institution |
| ZHAO Chun-qing |
Beijing Institute of Spacecraft Environment Engineering, Beijing, , China |
| LIU Yu-ming |
Beijing Institute of Spacecraft Environment Engineering, Beijing, , China |
| SHEN Zi-cai |
Beijing Institute of Spacecraft Environment Engineering, Beijing, , China |
| SHENG Jiang |
Science and Technology on Space Physics Laboratory, China Academy of Launch Vehicle Technology, Beijing, , China |
| ZHANG Kai |
Beijing Institute of Spacecraft Environment Engineering, Beijing, , China |
| YANG Yan-bin |
Beijing Institute of Spacecraft Environment Engineering, Beijing, , China |
| LIU Chong |
Beijing Institute of Spacecraft Environment Engineering, Beijing, , China |
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| Abstract: |
| The paper aims to study the tolerance ability of exposed wires on satellite in the space radiation environment.In this paper, the influence of low energy and high energy electrons on the conductor performance was studied by analyzing the radiation environment of the Rykan wire exposed in orbit for 10 years under GEO orbit. In the ground simulation test, the selected energy was 45 keV and 1 MeV; the fluence rate was 8.3×1010 e/(cm2.s); and the total dose was 2×1016 e/cm2. The degradation of mechanical properties (elongation at break, tensile strength) and electrical properties (breakdown voltage) of the Rykan wire were investigated during the test. The mechanism of electron irradiation damage was studied by means of XPS and SEM. The experimental results showed that the mechanical properties of Rykan wire were slightly reduced after irradiation under different energy electron irradiation. But the electrical properties were seriously degraded, and the influence of low-energy electrons was more serious than that of high-energy electrons. The breakdown voltage was reduced by 100% and 50% respectively.According to the calculation of dose-depth distribution, all the incoming electron energy of 45 keV is deposited in the depth range of a few microns below the surface of the sample, which is completely absorbed by the skin of the wire, causing great damage to the sample. However, most of 1MeV incident electron energy penetrates the skin and is deposited in the sample copper core, so its performance degradation is relatively small. Further, through SEM and XPS test and analysis, it is concluded that electron irradiation degrades the molecular chain of the Rykan wire, forms free radicals and gases, and the recrosslinking of free radicals is an important mechanism for the damage of the Rykan wire. |
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