磁性Fe-Cr纤维的长期稳定性和热稳定性  

Long-term and thermal stability of magnetic Fe-Cr 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：《中国有色金属学报》2006年第4期663-669,共7页The Chinese Journal of Nonferrous Metals

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

摘　　要：以Cu-Fe-Cr原位复合丝材萃取得微米级、亚微米级的Fe-Cr纤维,并研究了变形量、长期储存条件和热处理对Fe-Cr纤维样品结构和磁性能的影响。采用X射线衍射(XRD)和扫描电镜(SEM)分析了样品的结构和形貌,采用振动样品磁强计(VSM)测试了样品的磁性,并利用热重差热分析(TGA-DTA)比较了不同变形量的Fe-Cr纤维在空气中的热稳定性。结果表明:随着变形量的增大和Fe-Cr纤维的细化,纤维的饱和磁矩基本恒定(约140 A.m2/kg),而剩磁和矫顽力则逐渐增加;Fe-Cr纤维在无水乙醇和空气中储存一年以上,磁性基本保持不变;Fe-Cr纤维在空气中经300℃以上加热1 h后,逐渐由铁磁性的-(αFe,Cr)(BCC结构)固溶体转变为顺磁性的(Fe,Cr)2O3(六角晶系),饱和磁化强度显著下降;且随着变形量的增大,较细Fe-Cr纤维的热稳定性较差。The micron and sub-micron Fe-Cr fibers were extracted from Cu-Fe-Cr in situ composite wires. The effects of deformation strain, long-term preservation condition and heat treatment on structure and magnetic properties of Fe-Cr fibers samples were investigated. The structures and morphologies of samples were analyzed by XRD and SEM, respectively, and the magnetic properties of samples were measured by vibrating sample magnetometer （VSM）. The thermal stabilities of Fe-Cr fibers at different deformation strains were compared by TGA-DTA in air. The results show that with the increase of deformation strains and thinning of Fe-Cr fibers, the saturation magnetization are about 140 A · m^2/kg constantly, and the remanent magnetism and coercivity increase gradually. The mag- netic properties of Fe-Cr fibers are invariant when the Fe-Cr fibers were preserved in absolute alcohol or air for more than 1 a. After Fe-Cr fibers heated in air at temperature higher than 300 ℃ for 1 h, the Fe-Cr fibers transform from ferromagnetic α-（Fe, Cr）（BCC structure）solution to paramagnetic （Fe, Cr）2O3 （hexagonal structure）, and the saturation magnetization of samples decreases remarkably. With the increase of deformation strains, the thermal stability of thinner Fe-Cr fibers decreases.

关 键 词：Fe-Cr纤维 变形量 长期稳定性 热稳定性 磁性 

分 类 号：TG113.225[金属学及工艺—物理冶金]