占空比和羰基铁含量对镍铁氧体@羰基铁核壳粉体吸波性能的影响

针对镍铁氧体@羰基铁核壳粉体–石蜡复合体系,探讨了占空比和核壳粉体中羰基铁体积分数对其等效介电常数的影响,并预测了其吸波性能。研究结果表明:随着占空比和羰基铁体积分数的提高,复合体系的等效介电常数会有明显的增大;在相同的占空比下,随着羰基铁体积分数的提高,体系反射率有一个先减小后增大的过程,当羰基铁体积分数为30%时,反射率最小,达到–34 dB,吸收峰逐渐向低频移动;当羰基铁体积分数相同时,随着占空比的提高,反射率会逐渐变大,同时吸收峰也会朝低频移动。

Effects of duty ratio and carbonyl iron content on the microwave absorbing properties of nickel ferrites@carbonyl iron composites with core-shell structure

Effects of duty ratio and the volume fraction of the carbonyl iron(CI) in core-shell structure on the equivalent permittivity of the nickel ferrite@CI with core-shell structure-paraffin composite system were investigated,and the microwave absorbing properties of composite system were predicted.The results show that the equivalent permittivity increases obviously with the increasing of duty ratio and the volume fraction of CI;under the same duty ratio,the reflectivity decreases firstly and then increases with the increasing of the volume fraction of CI,when the volume fraction of CI is 30%,the reflectivity reaches to minimum of –34 dB and the absorption peak is moved to low frequency gradually;under the same volume fraction of CI,the reflectivity increases gradually with the increasing of duty ratio,the absorption peak is also moved to low frequency.