Al_2O_3对超细铁粉电磁性能影响的实验研究  

Effect of Al_2O_3 on Electromagnetic Characteristics of Hyperfine Iron Powder

作　　者：胡礼初[1] 张海燕[1] 曾国勋[1] 

机构地区：[1]广东工业大学材料与能源学院,广州510006

出　　处：《微波学报》2008年第2期77-81,共5页Journal of Microwaves

基　　金：国家自然科学基金(No.50372013);高等学校博士学科点专项科研基金(No.20050562002);广东省自然科学基金(No.036918);广州市科技计划项目(No.2005Z2-D2051);广东省教育厅自然科学研究项目(No.04Z005)资助的课题

摘　　要：超细金属铁粉制备过程中加入Al2O3，使其抗氧化性能提高的同时，调整超细铁粉的电磁参数。本文采用自蔓延燃烧法制备不同成份比侧的Al2O3／Fe2O3复合物，并以此为原料采用氢气还原得到Fe／Al2O3金属复合粉。采用XRD、SEM、DSC-TGA等手段分析其结构、形貌和抗氧化性能，通过矢量网络分析仪确定其电磁参数在2—18GHz范围内的变化情况。结果表明：当复合粉末中Al2O3为10％时，粉末的抗氧化性能得到明显提高，在2—18GHz范围内其介电常数的实部和虚部得到了有效调整。In order to improve the anti-oxidation and electromagnetic characteristics of the hyperfine iron powder, Al2O3 was added during the preparation of the powder. In the paper , the method of SHS was used to produce different componential Al2O3/Fe2O3 composite powder, which was deoxidized into Fe/Al2O3 composite metal powder by hydrogen later. The distinct characterization and anti-oxidation were investigated by X-ray diffraction （ XRD）, Scan electron microscopy （ SEM）, DSC-TGA and so on. The electromagnetic parameters were measured by Agilent micromave network analyzer in the range of 2 to 18GHz. Results have showed that when 10% Al2O3 was added into the hyperfine iron powder,its anti-oxidation could be improved obviously ,with its real and image part of permittivity to be rectified effectively.

关 键 词：FE/AL2O3 复合粉末 抗氧化性 电磁参数 

分 类 号：TM27[一般工业技术—材料科学与工程]