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| Evolution Mechanism of Tensile Strength for Graphite Films under Space Particle Irradiation Environment |
| Received:July 03, 2019 Revised:August 08, 2019 |
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| DOI：10.7643/issn.1672-9242.2020.03.003 |
| KeyWord:graphite films tensile strength defect irradiation |
| Author | Institution |
| HE Duan-peng |
Material Reliability Center, China Academy of Space Technology, Beijing , China |
| GAO Hong |
Material Reliability Center, China Academy of Space Technology, Beijing , China |
| XING Yan |
Material Reliability Center, China Academy of Space Technology, Beijing , China |
| LI Yan |
Material Reliability Center, China Academy of Space Technology, Beijing , China |
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| Abstract: |
| The paper aims to obtain irradiated graphite films in the total dose of 9×105~9×107 rad(Si) to discuss the evolution of tensile strength of graphite film in the space particle irradiation environment. Composition and structure of graphite films were characterized by means of SEM, XRD, calcination analysis and XPS. The results showed that they possessed orderly stacked layers with interlayer spacing of 0.3355nm. The mass fraction of carbon, volatile matter and ash content were 99.75%, 0.04%, 0.21%, respectively. Only C1s and O1s peaks were detected by XPS. The average linear expansion coefficient of graphite film was negative with a peak value of -1.33×10-6/℃, indicating excellent structural stability. The simulation test of space particle irradiation environment showed that the tensile strength of graphite films decreased gradually with the increase of total dose, and tended to be stable under high dose irradiation. The structure of graphite films was analyzed with a Raman spectra, revealing the evolution mechanism of the mechanical property. The tensile strength of irradiated graphite films is correlated with their defect content. Un-irradiated graphite films have the lowest defect content, thus owning the highest tensile strength. And with the increase of defect, the tensile strength decreases gradually. |
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