Dr. Sichen Qin Profile

Dr. Sichen Qin

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Proceedings Article | 23 December 2023 Paper

Extrapolation method for performance evolution of thin film materials under the synergistic effect of space radiation environments

Zicai Shen, Yuming Liu, Shijin Wang, Zhenyi Qi, Yifan Zheng, Sichen Qin, Yigang Ding, Yue Wang, Jianda Shao

Proceedings Volume 12982, 129820Q (2023) https://doi.org/10.1117/12.3018575

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Polyimide film can be used in spacecraft thermal control multilayer and large-scale deployment structure, and its mechanical properties will be degraded by space radiation environments such as electron and proton. In this paper, the mechanical properties of polyimide film under the synergistic effect of electron and proton was studied using the space integrated irradiation test facility in Beijing Institute of Spacecraft Environment Engineering. It is found that the combined irradiation of electron and proton damages the polyimide film more than the single environment of electron or proton. The synergistic effect of electron and proton causes the exponentially decrease of rupture elongation and the tensile strength of the polyimide film with. With the increase of the electron and proton irradiation fluence until its properties reaches a steady state.

Proceedings Article | 9 August 2021 Paper

Effect of material outgassing and contamination deposition induced by vacuum and temperature on spacecraft optical components

Zicai Shen, Wei Dai, Zhihao Wang, Yanzhi Wang, Sichen Qin, Hongbo He, Anna Sytchkova, Jianda Shao

Proceedings Volume 11912, 119120D (2021) https://doi.org/10.1117/12.2602354

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Silicon rubber and gray cable commonly used on spacecraft was selected as contamination sources, quartz crystal microbalance (QCM) was used as a monitoring device for molecular contamination deposition, and quartz glass was used as a collection plate for molecular contamination. The influence of different temperatures such as 100°C, 125°C, 150°C on the outgas contamination of silicone rubber and gray cable research was carried out in a vacuum environment , and the influence of different deposition temperature such as 10°C, 25°C, 40°C, 55°C, 70°C on the amount of contamination deposition was studied too. The spectral properties and morphology changes of quartz glass at a heating temperature of 125°C on the contamination sources and a deposition temperature of 25°C were studied. The research results show that as the deposition time increases, the amount of contamination deposits approximately linearly increases. With the increase of space temperature, the amount of outgas contamination deposits increases significantly, and as the temperature of the deposition surface increases, the contamination deposits exponentially decreases. The contamination deposits on the surface of quartz glass are in the form of droplets, and the droplets are of different sizes and randomly distributed. After being contaminated by molecular contamination, the optical transmittance of quartz glass significantly decreases.

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