磁性高铬铁素体纤维的热稳定性研究  

Investigation on thermal stability of magnetic high chromium ferritic fibers

作　　者：孙世清[1] 

机构地区：[1]河北科技大学材料科学与工程学院,石家庄050054

出　　处：《粉末冶金技术》2007年第2期88-91,共4页Powder Metallurgy Technology

基　　金：教育部科学技术重点研究项目(205015);河北省教育厅博士科研基金资助项目(B2004202)

摘　　要：由Cu-11%Fe-4%Cr原位复合丝材硝酸法提取得到高铬铁素体纤维。研究了热处理对高铬铁素体纤维样品结构和磁性的影响。采用X射线衍射和扫描电镜观察分析了样品的结构和形貌,采用振动样品磁强计测试了样品的磁性,利用热重差热分析比较了不同变形量的高铬铁素体纤维在空气中的热稳定性。结果表明,高铬铁素体纤维的比饱和磁化强度约为114A·m2·kg-1,高铬铁素体纤维在空气中经600℃以上加热1h后,逐渐由铁磁性的α-(Fe,Cr)(BCC结构)固溶体转变为顺磁性的(Fe,Cr)2O3(六方晶系),比饱和磁化强度显著下降;微米级、亚微米级高铬铁素体纤维的热稳定性显著高于微米级多晶铁纤维。High chromium ferritic fibers were extracted from Cu-11% Fe-4 % Cr in situ composite wires by nitric acid. The effects of heat treatment on structure and magnetic properties of high chromium ferritic fibers samples were investigated.The structure and morphology of samples were analyzed individually by XRD and SEM, and the magnetic properties of samples were measured by vibrating sample magnetometer （VSM）. The thermal stability of high chromium ferritic fibers at different deformation strains was compared by TGA-DTA in air.The specific saturation magnetization of high chromium ferritic fibers is about 114 A· m^2·kg^-1 .After high chromium ferritic fibers are heated in air at higher than 600℃ for 1 hour, the specific saturation magnetization of samples decreases remarkably because of the transformation from ferromagnetic α-（ Fe, Cr）（BCC structure）solution to paramagnetic （Fe, Cr）2O3 （Hexagonal structure）. Micron and sub-micron high chromium ferritic fibers are obviously superior in thermal stability to micron polycrystalline iron fibers.

关 键 词：高铬铁素体纤维 提取 热稳定性 比饱和磁化强度 

分 类 号：TM25[一般工业技术—材料科学与工程]