|
This nickel -plated carbon fiber , for nickel-plated carbon fiber / epoxy structural design of microwave absorbing materials were discussed nickel-plated carbon fiber content, arrangement spacing on the impact absorbing properties , discussed its absorbing mechanism . Nickel-plated carbon fiber / epoxy resin absorbing materials with carbon black / graphite , Co composite powder , discussed other absorbing material absorbing agent is added for effect . Found : nickel -plated carbon fiber , carbon fiber surface by a continuous , bright metal Ni layer , by EDX analysis , that the Ni layer is Ni-P alloy . Nickel -plated carbon fiber absorbing performance has been significantly improved. When nickel-plated carbon fiber orthogonally arranged in the resin , the different mass fractions and different spacing absorbing properties of carbon fibers have a certain influence, when the carbon fiber spacing of 5mm , the absorbing properties than other spacing absorbing material ; when the mass fraction of carbon fiber 0.56% -1.57 % , you can design a good performance absorbing material . When the carbon fiber spacing of 5mm time , absorbing the best performance , the mass fraction of 0.86% , the maximum absorption peak reaches -18.63dB, less than -10dB bandwidth reaches 4.85GHz. By the conductive carbon black / graphite different mass ratio , adjust the conductive carbon black / graphite system dielectric constant , when the conductive carbon black : graphite = 1:1 , and with different concentrations of compound to the resin , the addition of conductive carbon black 0.2g / graphite , the maximum reflectivity to -28.16dB, the effective bandwidth of 7.3GHz, and the peak moves to the lower band , but when the conductive carbon black / graphite system that is added in an amount to 0.8g mass fraction of 0.5% when absorbing properties decreased. Join magnetic metallic Co powder , help broaden the absorption frequency , nickel-plated carbon fiber / epoxy resin absorbing materials from a single into a double absorption peak absorption peak at 7-9GHz -band and Ku-band band has less than -10dB most of the reflection attenuation. With the Co content increases, the absorption peak moves to lower frequency trend. In the low frequency range, as the Co content increases, the maximum absorption peak of the first increased and then decreased , the Co powder was added in an amount of 1% of the matrix , the maximum absorption peaks at 7.54GHz reached -13.7dB, the Ku-band , Co to join, and the frequency of the absorption peaks broadband little impact.
|