摘要
用直流电弧等离子体法制备Fe纳米粒子,用作微波吸收剂。用γ-氨丙基三乙氧基硅烷(KH550)对Fe纳米粒子的表面改性,然后按不同比例与环氧树脂均匀混合。在混合物中添加碳纤维后制备出Fe纳米粒子/碳纤维/环氧树脂基功能/结构一体化吸波复合材料,研究了吸收剂的添加量和浓度梯度、碳纤维以及平板结构等因素对其在2-18 GHz范围内吸波性能的影响。结果表明,碳纤维促进了结构体内电磁波的多重反射与吸收,在低频段出现反射损耗峰并提高吸波性能;随着Fe纳米粒子含量的提高吸波能力逐渐增强,吸收峰向低频移动;在环氧树脂的固化过程重力导致Fe纳米粒子浓度呈梯度分布,使平板状复合材料正、反两面的吸波性能出现差异,吸收剂浓度的梯度分布有利于电磁波的进入和吸收。
Fe- nanoparticles(NPs)/ carbon fibers(CF)/epoxy resin(EP) based composites were designed and fabricated. The microwave absorbers Fe- NPs were prepared by the direct current(DC) arcdischarge plasma method and modified with silane coupling agent KH550. The reflection losses of composites were measured in the frequency range of 2-18 GHz and the effects of Fe-NPs, CF and the geometry feature of test plates on the microwave absorbing properties were investigated. Results show that reflection loss peaks appear at low frequency and the microwave absorbing properties are enhanced due to the addition of CF. With the increasing mass fraction of Fe- NPs the microwave dissipation increases and the reflection loss peaks move towards the low frequency. The concentration gradient of Fe- NPs in EP matrix was caused by gravity during the preparation process and it causes reflection loss differences between the two surfaces of a plate, which is beneficial for microwave to enter the composite plate and be absorbed by properly setting the plate.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2015年第2期81-87,共7页
Chinese Journal of Materials Research
基金
国家自然科学基金51271044
51331006
51171033资助~~
