Study on Thermal Aging Characteristics of Typical Electromagnetic Coil Glass Fiber/Epoxy Composite Materials

In order to study the insulation characteristics of glass fiber/epoxy composites under extreme physical fields of typical electromagnetic coil launchers, 3240 and G11 glass fiber/epoxy composites were used as research objects. The temperature distribution characteristics of electromagnetic coil launchers were analyzed by finite element method, and an equivalent test platform was constructed for thermal aging test. Combined with macroscopic and microscopic tests, the aging mechanism of glass fiber/epoxy composites for coil launchers was revealed. At 110 ℃, 130 ℃, 150 ℃ aging temperature and 24 h(1 d), 72 h(3 d), 144 h (6 d), 216 h (9 d) aging time. The changes of aging characteristic quantities such as mass loss rate and impact strength of glass fiber/epoxy composites were studied respectively. The thermal aging mechanism of glass fiber/epoxy composites was analyzed by scanning electron microscopy and Fourier infrared spectroscopy. The results show that G11 glass fiber/epoxy composites have smaller mass loss rate, greater impact strength and greater elastic modulus than 3240 glass fiber/epoxy composites, which proves that G11 glass fiber/epoxy composites have better thermal aging characteristics.