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玻璃纤维增强树脂(GF/EP)因其良好的热绝缘性能和优异的力学性能,在高能物理和核物理实验领域作为支撑材料得到应用。高能物理和核物理实验会对支撑材料产生大量的γ和中子辐射,同时要求其保持热性能的稳定。本文对20kGy、100kGy和200kGy剂量的γ辐照下GF/EP的各项热学性能进行测试研究,包括热膨胀性能、导热性和热降解性能,并对辐照前后GF/EP的微观形貌进行观察。结果发现,辐照后,GF/EP的微观形貌发生变化,基体树脂产生碎片化,辐照后线膨胀范围缩小,线膨胀系数略有降低;导热系数降低,降低幅度随辐照剂量的增大而减小;热分解温度基本保持不变,最快热分解温度略有降低,γ辐照过程中同时发生辐照交联和辐照降解反应,但总体热学性能保持稳定,在使用温度范围内保持良好的稳定性。
Glass fiber reinforced resin (GF / EP) is used as a support material in high energy physics and nuclear physics experiments because of its good thermal insulation and excellent mechanical properties. High-energy physics and nuclear physics experiments produce large amounts of gamma and neutron radiation on the support material, while requiring it to maintain its thermal stability. In this paper, the thermal properties of GF / EP under γ irradiation at doses of 20kGy, 100kGy and 200kGy were investigated, including thermal expansion, thermal conductivity and thermal degradation properties, and the microscopic morphology of GF / EP before and after irradiation was observed . The results showed that after irradiation, the morphology of GF / EP changed, the matrix resin was fragmented, the range of linear expansion after irradiation was reduced, the coefficient of linear expansion was slightly decreased, the thermal conductivity was decreased, and the decrease with the increase of irradiation dose The thermal decomposition temperature remained unchanged, the fastest thermal decomposition temperature decreased slightly, radiation crosslinking and radiation degradation reaction occurred simultaneously in γ irradiation, but the overall thermal properties remained stable. In the temperature range Maintain good stability within.