羰基铁粉的电磁波吸收性能

Electromagnetic Wave Absorption Property of Carbonyl Iron Powder

羰基铁粉作为常见的电磁波吸收涂料,其形貌和含量对电磁波吸收性能有极大影响。为掌握羰基铁粉吸波涂料的介电常数、磁导率等参数随频率的变化规律,制备并测试了不同配比的微米级片状羰基铁粉同轴环样品。测试结果表明:羰基铁粉的最佳质量分数为60%~80%,样品厚度为2 mm、2.5 mm时,反射损耗-10 dB以下的有效吸收频宽分别为7.36 GHz、2.4 GHz,最大反射损耗值分别为-19.612 dB、-27.707 dB。样品厚度增加,最大吸收频率移向低频端。

As a common electromagnetic wave absorbing coating, carbonyl iron powder has a great influence on the electromagnetic wave absorbing property. In order to master the variation law of dielectric constant, magnetic permeability and other parameters of carbonyl iron powder absorption coating with frequency, the micron flake carbonyl iron powder coaxial ring samples with different proportions were prepared and tested. Electromagnetic wave absorption test results show that the optimal mass fraction of carbonyl iron powder is 60%? 80%. When the sample thickness is 2 mm and 2.5 mm, the effective absorption bandwidth of reflection loss below -10 dB is 7.36 GHz and 2.4 GHz, and the maximum reflection loss value is -19.612 dB and -27.707 dB, respectively. As the sample thickness increases, the maximum absorption frequency shifts to the lower frequency end.