| The curing behavior of micron Al2O3/E-51 epoxy resin/2-ethyl-4 -methylimidazole (2, 4-EMI) was investigated in this work. The deflation behavior in the vacuum heat treatment conditions was also studied. Structural changes in process of curing and vacuum heat treatment were analyzed by Fourier Transform Infrared Spectroscopy (FTIR). The shear property, damping and thermal expansion properties of micron Al2O3/epoxy resin were studied. The influences of vacuum heat treatment and micron Al2O3 on the damping and thermal expansion properties were discussed in detail.The results show that the curing of micron Al2O3/E-51 epoxy resin is an exothermic process. And dynamic model of the curing process indicats a multi-step reaction. Hydroxyl is formed by opening epoxy groups and hydrogen during the curing process, meanwhile addition reaction is occurred in the cyanide of rubber.It is found that with the increase of temperature, the mass loss rate of micron Al2O3/epoxy resin is significantly improved under lower vacuum. However, temperature has little effect on the deflation of the composite material under higher vacuum. High vacuum is beneficial to the gas release in the material.The influences of temperature and strain rate on the shear property of the micron Al2O3/epoxy resin composite material were also studied. It is found that lnτincreases with 1/T increasing (τis the shear stress value of plastic deformation) . The value of m (strain rate sensitivity index) increases with temperature. The apparent activation energy of deformation is 51kJ/mol.The vacuum heat treatment process reduces the damping property of epoxy resin, but improves the damping property of micron Al2O3/epoxy resin composite material. The process reduces the expansion coefficient of epoxy resin, but has little effect on the expansion coefficient of the composite material. Micron Al2O3 particles improve the damping and thermal expansion properties of epoxy resin. |
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