FeSiAlCr合金/W型六角晶系Ba铁氧体复合粉体的制备及微波特性  

Preparation and microwave characteristics of FeSiAlCr alloy/W-type hexagonal Ba-ferrite composite powder

作　　者：黄生祥[1,2] 邓联文[1,2] 丁丽[1] 胡照文[1] 周克省[1] 肖鹏[2] 黄伯云[2] 

机构地区：[1]中南大学物理与电子学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2012年第4期495-500,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划('973'计划)资助项目(2011CB605804);湖南省自然科学基金资助项目(10JJ5049);湖南省科技计划项目(2011SK3258);粉末冶金国家重点实验室开放基金资助项目;中南大学博士后基金资助项目

摘　　要：以雾化Fe85Si2Al6Cr7粉和溶胶凝胶法制备的W型六角晶系Ba1Co0.9Zn1.1Fe16O27铁氧体粉末为原料,通过高能球磨复合改性得到FeSiAlCr合金/W型六角晶系Ba铁氧体复合粉体。采用X射线衍射仪（XRD）和扫描电镜（SEM）对该粉体的微结构和形貌进行分析和观察,利用微波矢量网络分析仪系统测定粉体试样在2~18 GHz频段内的复介电常数和复磁导率以及吸波涂层试样板的吸波性能,研究该复合粉体的微波电磁特性和电磁损耗性能。结果表明,FeSiAlCr合金/W型六角晶系Ba铁氧体复合粉体颗粒保持W型铁氧体的六角片状晶粒形貌和微结构;其ε′、ε″、μ′和μ″均高于W型铁氧体而低于Fe合金的对应值;FeSiAlCr合金含量与复合材料的磁损耗和介电损耗的相对强弱密切相关,Fe合金含量适中的复合材料,其吸波涂层厚度为2 mm时,在2~18 GHz全频段的吸波性能高于20 dB,峰值点达50 dB。Using atomized FessSi2Al6Cr7 powder and sol-gel W-type hexagonal ferrite of Ba1Co0.9Zn1.1Fe1.66027 as raw materials, FeSiA1Cr alloy and W-type hexagonal Ba-ferrite composite powders were synthesized by high-energy ball milling technology. Microstructure and morphology of the composites were analyzed by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. Complex permeability, complex permittivity and microwave absorbing ability in 2-18 GHz were measured by microwave vector network analyzer for the composite. Electromagnetic characteristics and microwave loss mechanism were also explored. Results show that, microstructure and morphology of W-type hexagonal ferrite are all maintained for the composite. Values of complex permittivity （ε＇,ε＂） and complex permeability（μ＇, μ＂） are all larger than those of the W-type ferrite but smaller than those of the Fe-alloy. Content of Fe-alloy in the composites is closely related with relative strength of magnetic loss vs dielectric loss. For the composites with moderate content of Fe-alloy, when thickness of the coating is 2 ram, the maximum value of microwave reflection loss is -50 dB and microwave absorption values are less than -20 dB in the whole frequency range of 2-18 GHz.

关 键 词：FeSiAlCr合金 W型六角Ba铁氧体 复合材料 微波吸收 

分 类 号：TM271[一般工业技术—材料科学与工程]