【作者】 李小莉；

【导师】 贾虎生；

【作者基本信息】 太原理工大学 ， 材料加工工程， 2004， 硕士

【摘要】 论文主要对多晶铁纤维吸收剂的制备及其电磁波吸收性能进行了系统的研究，首先利用磁引导的MOCVD(Metal OrganismChemical Vapor Decompose)法制备了多晶铁纤维，然后对铁纤维的含量对涂层的吸收性能的影响进行了研究，发现多晶铁纤维只要以小于65％的质量填充比就可获得较好的吸收，这就大大降低了涂层的面密度，当纤维含量为60％wt时涂层的面密度仅为1.82kg／m~2，而反射率小于-8dB的合格带宽为4.2GHz，反射率最小值达—16.5dB。此外，通过电磁参数的测量，发现多晶铁纤维的为双复介质吸收剂，不但具有较大的磁导率实部及虚部，而且其介电常数也实部和虚部也非常大，这也是多晶铁纤维能够实现薄涂层吸收原因。涂层的厚度也是影响吸收涂层吸收性能的关键因素之一，所以文中就涂层厚度对多晶铁纤维吸收性能的影响进行了分析研究。 多晶铁纤维吸收剂近年来备受关注的原因还在于其电磁参 太原理工大学硕士学位论文数的各向异性，多晶铁纤维的轴向介电常数远大于径向介电常数，轴向磁导率远大于其径向磁导率，所以导致铁纤维在涂层的取向对涂层的吸收性能有很大影响，本文通过试验证明了多晶铁纤维电磁参数的各向异性，并从试验的角度证明多晶铁纤维电磁参数各向异性对涂层吸收性能的影响，将电磁参数的各向异性与电磁波的极化性能相结合，发现取向的铁纤维对电磁波的吸收性能随着电磁波的极化状态及入射角的不同而出现了巨大差异。 最后将吸波涂层的设计与多晶铁纤维的工程应用相结合，设计了一种电磁波吸收涂料，并达到了设计要求。然后将不锈钢薄片吸收剂与多晶铁纤维吸收剂从多方面作了比较，为全面了解多晶铁纤维的性能提供更多的参考。更多还原

【Abstract】 In the paper, the production and electromagnetic wave absorbing properties of polycrytalline iron fibers (PIF) were studied mostly. First, the PIF were produced by inducing magnetic field metal organism chemical vapor decompose. A series test show that when the content of iron fibers is less than 65%wt the coating have good performance and the planar density of the coating is greatly reduced. When the content of iron fibers is 60%wt, theplanar density only is 1,85kg/m2 , the bandwidth is 4.2GHz that the reflectivity is less than -8dB, the least reflectivity is -16.5dB. We measure electromagnetic parameter of the PIF. The result show that the permeability and permittivity of PIF were both complex number. The real and imaginary part of the permeability and permittivity of the PIF were relatively larger. The relations between thickness ofthe coating and the reflectivity were discussed because the thicknessthe coating and the reflectivity were discussed because the thickness of the coating is also a key factor affected the reflectivity.The reason why more and more attention was give to the PIF in recent years is the anisotropy of the electromagnetic of the PIF. The axial permittivity of the PIF is much larger than the radial and the axial permeability is larger than the radial, so that the reflectivity of the coating is affected by the orientation of the PIF in the coating. In the paper, the anisotropy of the electromagnetic of the PIF and its effect to the reflectivity were verified by the test. The results of test show when the iron fibers were orientation the reflectivity varied with the different polarization and incidence of the incident electromagnetic wave.At the end of the paper, combining the engineering application of PIF to the design of radar absorbing coating, we produced a kind of radar absorbing painting, the painting satisfied the criteria of design. The comparison the stainless steel flake with the PIF in different way give more reference in roundly knowing the properties of PIF.更多还原