中文摘要：

片状羰基铁具有高的饱和磁化强度和一定的平面各向异性,可突破Snoek限制,在微波吸收领域具有很好的应用前景.本文以球状羰基铁粉为原料,机械球磨制备了片状羰基铁,并根据球磨钢珠配比的改变获得形貌和电磁性能各异的片状羰基铁：随着钢球平均直径的减小,羰基铁片状结构逐渐增多,片状尺寸增大,片层厚度变薄,吸波性能提高;当采用4 mm钢球进行球磨时,片状羰基铁具有最佳吸波性能,其复磁导率的实部和虚部在2 GHz时可达到2.8773和0.9493;涂层厚度为2 mm时,反射率损耗在9.1 GHz处达到最大值-35 dB,小于-10 dB频带宽为7.429 GHz.

英文摘要：

The behaviours about high saturation magnetization and certain plane anisotropy of flake-shaped carbonyl-iron particle （FCI）are conditioned by the breakthrough mechanism of Snoek limitation.Thus,it will be exposed a wide application for the field of microwave-absorb.The FCI was synthesed from spherical carbonyl iron powder with various steel ball ratios by mechanical milling.The results have also demonstrated an obvious effect on the morphological and electromagnetic characteristics accompanied with different ratio of steel ball.With the decrease of average diameter of the steel ball,the flake product yield was gradually increased with the larger size,thinner flake and the increased absorbing properties.For the milling with diameter of 4 mm,the FCI has the best microwave absorbing properties,and the real part and the imaginary part of complex permeability of the material at 2 GHz can be achieved 2.8773 and 0.9493 respectively.The results also show that the reflectance loss （RL）reached the maximum value of-35.472 dB at 9.184 GHz when the coating thickness is 2 mm,and the frequency band is 7.429 GHz when the RL is less than-10 dB.