论文部分内容阅读
玻璃纤维/环氧树脂复合材料具有高绝缘性和高力学性能,常作为支撑材料用于高能物理和核物理试验,但其力学性能在辐照环境中将发生变化。根据玻璃纤维/环氧树脂复合材料在新一代北京正负电子对撞机(BEPCII)中的应用要求,研究了玻璃纤维/环氧树脂复合材料中的玻璃布/环氧树脂层压板γ辐照前后的压缩性能。研究表明:经20kGy的γ辐照后,玻璃布/环氧树脂层压板的压缩强度由辐照前的320.21 MPa下降为315.05 MPa,下降了1.61%;经200kGy的γ辐照后,玻璃布/环氧树脂层压板的压缩强度下降为312.30 MPa,下降了2.47%。利用扫描电镜对辐照前后的试件断口进行微观形貌观察,发现辐照对玻璃布没有明显影响,但使玻璃布与环氧树脂的结合度有所降低,环氧树脂的碎片化趋于明显,红外谱图显示环氧树脂在辐照后的降解反应强于交联反应。
Glass fiber / epoxy composites with high insulation and high mechanical properties, often used as supporting materials for high-energy physics and nuclear physics experiments, but its mechanical properties in the irradiation environment will change. According to the application requirements of glass fiber / epoxy composites in a new generation of Beijing Electron Positron Collider (BEPCII), the glass cloth / epoxy laminate in glass fiber / epoxy composites Before and after the compression performance. The results show that the compressive strength of glass cloth / epoxy laminate decreases from 320.21 MPa before irradiation to 315.05 MPa after irradiation with 20 kGy γ-rays, down by 1.61%. After 200 kGy γ irradiation, the glass cloth / The compressive strength of the epoxy laminate decreased to 312.30 MPa, a decrease of 2.47%. Scanning electron microscopy (SEM) was used to observe the microstructures of the fracture surfaces before and after irradiation. It was found that the irradiation had no obvious effect on the glass cloth, but the degree of binding between the glass cloth and the epoxy resin decreased. The fragmentation of the epoxy resin tended to Obviously, the infrared spectrum shows that the degradation of epoxy resin after irradiation is stronger than the cross-linking reaction.