Study on Electrical Insulation Property and Microcosmic Mechanism of GFRP Under the Effect of γ Irradiation
ZHENG Lifang1, CUI Zhe1, WANG Zhaozhong1, XIE Yajie2, YUE Lina3, CHEN Xuanqi1
1 School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3 School of Environmental Engineering, North China Institute of Science and Technology, Beijing 101601, China
Abstract: As composite materials, glass fiber reinforced plastics (GFRP) are used to make supporting equipment in high energy physics and nuclear physics experiments for its good electrical insulation property, thermal insulation property and mechanical performance. High-speed particles produce large amounts of γ or neutron irradiation in high energy physics and nuclear physics experiments. In order to ensure the stability of GFRP supporting equipment under the effect of irradiation, the electrical insulation property of GFRP must be researched under irradiation condition and the microstructure should be studied to reveal the microcosmic mechanism that causes the change of electrical insulation property. In this paper, the electrical insulation properties of GFRP were studied by electric-conductivity measure, scanning electron microscope, infrared spectrum and X-ray photoelectron spectroscopy. Then the microcosmic mechanism of irradiation damage was analyzed. The results showed that after γ irradiation of 20 kGy, 100 kGy and 200 kGy, the average electrical resistivity of GFRP increased from 8.16×1012 Ω·m to 15.88×1012 Ω·m, 23.13×1012 Ω·m, and 43.15×1012 Ω·m. There was a strong linear rule between the average resistivity and the dose of γ irradiation. It was found that there were some cracks on the surface of the glass fiber after γ irradiation. The epoxy resin became fragmenting and some pores appeared in it. The molecular bond was broken and the GFRP was oxidized. All these irradiation damages result in the rise of electrical resistivity. GFRP can meet high electrical insulation requirements in high energy physics and nuclear physics experiments under irradiation environments.
郑莉芳, 崔哲, 王兆中, 谢亚杰, 岳丽娜, 陈璇琪. γ辐照作用下GFRP电绝缘性能及其微观结构机理研究[J]. 材料导报, 2020, 34(8): 8179-8183.
ZHENG Lifang, CUI Zhe, WANG Zhaozhong, XIE Yajie, YUE Lina, CHEN Xuanqi. Study on Electrical Insulation Property and Microcosmic Mechanism of GFRP Under the Effect of γ Irradiation. Materials Reports, 2020, 34(8): 8179-8183.
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