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Investigation on Molding Process and Film Compatibility of Carbon Fiber/Epoxy Ultra-Thin Prepregs |
ZHANG Guangcheng1, ZHANG Hongming1, XU Hengyuan2, FENG Shaohong2, LI Jianchuan2 |
1. School of Natural and Applied Sciences, Northwestern Polytechnic University, Xi’an 710072, China;
2. Composite Factory, AVIC Chengdu Aircraft Industrial (Group) Co., Ltd., Chengdu 610092, China |
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Abstract The curing reaction kinetic parameters of CF832/T700 ultra-thin carbon fiber prepreg/epoxy resin systems were studied through DSC tests. The influence laws of pre-absorbing process parameters and curing process parameters on the mechanical properties of ultra-thin carbon fiber composite laminates were investigated by orthogonal tests. The most suitable adhesive film was determined by using three different adhesive films of EA9696NW, LWF–2B and FM73M to co-cure the ultra-thin prepreg laminates and Nomex honeycomb. The results show that the curing reaction activation energy of CF832/T700 prepregs is 85.98kJ/mol, the curing reaction is a slow first-order reaction. The pre-curing temperature, curing temperature and post-curing temperature are 115℃ , 135℃ and 171℃ , respectively. The bending and stretching experiments were carried out with the orthogonal analysis, the best pre-absorbing and curing process parameters are obtained, including pre-absorbing temperature 60℃ , pre-absorbing pressure magnitude 0.3MPa and pre-absorbing time 10min. The best curing parameters of curing temperature, curing pressure and curing time are 130℃, 0.4MPa and 2.5h. The EA9696NW adhesive film presents the best co-curing performance.
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[1] |
. COVER[J]. Aeronautical Manufacturing Technology, 2022, 65(3): 1-1. |
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