Preparation and microwave absorption properties of basalt fiberickel core-shell heterostructures

摘要

Basalt fiberickel core-shell heterostructures with different thicknesses of nickel shells are fabricated successfully. The electromagnetic parameters of basalt fiberickel-paraffin composites ranging from 8.2 to 12.4 GHz (X band) are measured for investigating the microwave absorption properties. The electro-magnetic parameters of basalt fiberickel are several times higher than those of naked basalt fibers due to the formation of the core-shell interface. The measured results indicate that effective electromagnetic match is realized in the whole X band. The values of complex permittivity and permeability of basalt fiberickel increase monotonically with the increasing thicknesses of the nickel shells. It is interesting that the reflection loss of basalt fiberickel do not show the monotonic character with the increas-ing thicknesses of the nickel shells. The basalt fiberickel with the nickel shell thickness about 300 nm shows the strongest reflection loss. The value of reflection loss is more than 15 dB in the whole X band and reaches 40 dB at 8.9 GHz, while the naked basalt fibers hardly exhibit any microwave absorption. The excellent microwave absorption properties of the basalt fiberickel core-shell heterostructures are attributed to the good electromagnetic match between the dielectric loss and magnetic loss.