Electrical/thermal stability of GFRP under different intensities γ ray irradiation
Electrical/thermal stability of GFRP under different intensities γ ray irradiation
复制标题
不同强度伽马射线照射下GFRP的电/热稳定性
DOI：
10.1016/j.fusengdes.2020.111856
复制
发表时间：
2020-09-01
影响因子：
1.7
通讯作者：
Cui, Zhe
中科院分区：
文献类型：
--
作者：
Zheng, Lifang;Yue, Xiude;Cui, Zhe
玻璃纤维增强塑料（GFRP）因其优异的隔热性能和机械性能，在高能物理和核物理领域被用作支撑材料，如BEPCII、ITER以及中国政府将要建设的CEPC等。但数量很大。和中子辐照就是在这些环境中产生的。材料的热分解动力学和电绝缘参数会受到辐照的影响。为了保证GFRP在γ辐照条件下的稳定性，需要计算不同辐照强度下的体积电阻率和活化能。结果表明，伽马射线辐照提高了 GFRP 的电绝缘性，并且绝缘性随着强度的增加而增加。经过20 kGy、100 kGy和200 kGy伽马射线照射后，GFRP的体积电阻率分别从8.16 x 10(12) Omega m增加到15.88 x 10(12) Omega m、23.13 x 10(12) Omega m和43.15 x 10(12) Omega m。 GFRP在氮气气氛中的热解过程可分为三个阶段，主要失重阶段发生在200～470℃。采用两种方法计算了不同辐照强度下GFRP的活化能，并对结果进行了比较。辐照提高了 GFRP 的活化能。采用SEM和XPS研究了不同γ辐照强度下GFRP的微观结构。结果发现，环氧树脂在辐照过程中出现碎裂倾向并出现孔隙。 GFRP被氧化，O1s含量随着强度的增加而增加。
Glass fiber reinforced plastic (GFRP) is used as support material in high energy physics and nuclear physics due to its excellent thermal insulation and mechanical performance, such as BEPCII, ITER and the CEPC Chinese government will build. But large amounts of. and neutron irradiation were produced in these environments. The thermal decomposition kinetics and electrical insulation parameters of the material will be affected by the irradiation. In order to ensure the stability of GFRP under gamma-irradiation conditions, the volume resistivity and the activation energy need to be calculated under different irradiation intensities. It revealed that gamma-irradiation increases the electrical insulation of GFRP, and the insulation increases with increasing intensity. After 20 kGy, 100 kGy and 200 kGy gamma-irradiation, the volume resistivity of GFRP increased from 8.16 x 10(12) Omega m to 15.88 x 10(12) Omega m, 23.13 x 10(12) Omega m and 43.15 x 10(12) Omega m, respectively. And the pyrolysis process of GFRP in a nitrogen atmosphere can be divided into three stages, the main weight loss stage occurs at 200 similar to 470 degrees C. Two methods were used to calculate the activation energy of GFRP under different irradiation intensities, and the results were compared. Irradiation improves the activation energy of GFRP. The microstructure of GFRP under different gamma-irradiation intensities was studied by SEM and XPS. It was found that fragmentation tendency and pores appeared in the epoxy resin during the irradiation. GFRP was oxidized and the content of O1s increased with increasing intensity.