CIP/GF/CF/EP吸波复合材料的制备及力学性能

为制备兼具力学性能和电磁吸收性能的结构型吸波材料,采用真空辅助成型工艺设计制备一种以羰基铁粉(CIP)为吸收剂,玻璃纤维(GF)为透波层,碳纤维(CF)为反射层,环氧树脂(EP)为基体的吸波复合材料。研究了不同质量比CIP/EP对吸波复合材料力学性能和微波吸收性能的影响。通过FTIR和DSC分析可知CIP未与EP发生化学反应。SEM结果表明CIP能够在EP树脂基体中均匀分散,不趋向于纤维表面。力学测试分析结果显示:当CIP/EP质量比达到30%时,CIP/GF/CF/EP复合材料的力学性能最佳,拉伸强度为347.56MPa,拉伸模量为25.99GPa,较纯GF/CF/EP复合材料提升了4.3%和5.7%;弯曲强度为339.6MPa,弯曲模量为23.7GPa,较纯GF/CF/EP复合材料提升了18.2%和71.2%。矢量网络分析可知复合吸波板的吸波性能随CIP含量的增加而增加,且吸波损耗反射峰值朝低频段移动。

Preparation and mechanical property of CIP/GF/CF/EP absorbing composites

In order to prepare structural absorbing materials with mechanical properties and electromagnetic absorption properties,a kind of absorbing composites with carbonyl iron powders(CIP)as absorbent,glass fiber(GF)as the transmittance layer,carbon fiber(CF)as the reflective layer,and epoxy resin(EP)as matrix was designed and fabricated by vacuum assisted resin infusion process.The effect of different mass ratios of CIP/EP on the mechanical properties and microwave absorption properties of the composites was studied.The results of FTIR and DSC suggest that there is not a chemical reaction between CIP and EP.SEM shows that CIP can be dispersed uniformly in EP resin matrix and not toward the surface of the fibers.The results of mechanical tests indicate that the best mechanical properties of the CIP/GF/CF/EP composites are at a mass ratio of 3∶10 of CIP to EP.The tensile strength and tensile modulus are 347.56MPa and 25.99GPa,4.3%and 5.7%higher than that of GF/CF/EP composites.The flexural strength and the flexural modulus are 339.6MPa and 23.7GPa,18.2%and 71.2%higher than that of GF/CF/EP composites.Vector network analysis proves that the absorbing performance of composites absorbing plate is increased and the peak of reflection absorbing loss is moved toward the low frequency band with the increase of CIP.