高铬铁基纤维的热稳定性和磁性  

Thermal Stability and Magnetic Properties of High Chromium Iron 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：《材料工程》2007年第11期3-6,共4页Journal of Materials Engineering

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：高铬铁基纤维由Cu-11Fe-4Cr原位复合丝材硝酸法萃取得到。研究了微米级、亚微米级高铬铁基纤维样品的结构和磁性变化规律。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基纤维在空气中的热稳定性。结果表明:在空气中低于600℃加热1h后,高铬铁基纤维保持BCC结构不变,样品的饱和磁化强度均大于100 A.m2.kg-1;经800℃加热1h后,由铁磁性的-α(Fe,Cr)固溶体转变为顺磁性的(Fe,Cr)2O3,样品的饱和磁化强度显著下降。微米级、亚微米级高铬铁基纤维的热稳定性显著高于微米级多晶铁纤维。随着变形量增大,较细的高铬铁基纤维的热稳定性较差。High chromium iron fibers were extracted from Cu-11Fe-4Cr in situ composite wires by nitric acid.The relation between structure and magnetic properties of micron and submicron high chromium iron fibers 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 iron fibers at different deformation strains was compared by TGA-DTA in air.The BCC structure of high chromium iron fibers is invariant when the fibers samples heated below 600 ℃ for 1 hour,and the saturation magnetization values of corresponding samples are always higher than 100 A·m^2·kg^-1.After the fibers heated at 800℃ for 1 hour,the saturation magnetization of samples decreases remarkably because of the transformation from ferromagnetic α-（Fe,Cr） solution to paramagnetic（Fe,Cr）2O3（Hexagonal structure）.Micron and sub-micron high chromium iron fibers are obviously superior in thermal stability to micron polycrystalline iron fibers.With increasing deformation strains,the thermal stability of thinner fibers decreases.

关 键 词：原位复合材料 高铬铁基纤维 变形量 热稳定性 磁性 

分 类 号：TG113.22[金属学及工艺—物理冶金]