(江苏大学 材料科学与工程学院，镇江 212013)
摘 要: 以柠檬酸和金属盐为原料，采用有机凝胶−热还原法制备了Fe0.13[Co20Ni80]0.87三元合金微细纤维。采用FTIR、XRD、TG/DSC、SEM和EDS等对纤维前驱体和热还原产物的结构、物相、形貌和组成进行了分析。采用振动样品磁强计(VSM)对纤维的磁性能进行了测试。结果表明：Fe0.13[Co20Ni80]0.87合金纤维的直径为0.3~2.0 μm，表面光滑、长径比大；组成合金纤维的晶粒大小与还原温度密切相关，当温度为300~700 ℃时，晶粒尺寸由约20 nm增加到约50 nm；该合金纤维显铁磁性，其矫顽力主要受合金中C含量及晶粒大小的影响，随制备温度的升高而降低；饱和磁化强度则主要与合金的组分相关，随还原温度的升高和合金纯度的提高而增大；经700 ℃热还原后，合金纤维的饱和磁化强度ms为120 A∙m2/kg，矫顽力Hc为10.4 kA/m。
关键字: 有机凝胶−热还原法；纳米晶；Fe0.13[Co20Ni80]0.87合金纤维；铁磁性
（School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China）
Abstract: Fe0.13[Co20Ni80]0.87 alloy fine fibers were prepared by organic-gel thermal reduction process using citric acid and metal salts as raw materials. The structure and morphologies of the gel precursors and fibers derived from thermal reduction of these precursors were characterized by FTIR, XRD, TG/DSC and SEM. The magnetic properties for the as-prepared alloy fibers were examined by vibrating sample magnetometer(VSM). The results show that Fe0.13[Co20Ni80]0.87 alloy fibers are characterized with thin diameters between 0.3 and 2.0 μm, with high aspect (length over diameter) ratio, dense and smooth surfaces. The crystalline size of the alloy fibers are mainly influenced by the thermal reduction temperature and are in the range of 20 to 50 nm with a corresponding reduction temperature range of 300 to 700 ℃. The magnetic properties of the alloy fibers are largely affected by the carbon content and crystalline sizes of the alloy fibers. With increasing thermal reduction temperature, the coercivity decreases while the saturation magnetisation value of the alloy fibers dramatically increases at lower reduction temperatures. The alloy fibers prepared at reduction temperature of 700 ℃ have a saturation magnetisation value of 120 A∙m2/kg and a coercivity value of 10.4 kA/m, respectively.
Key words: organic gel-thermal reduction method; nanocrystalline; Fe0.13[Co20Ni80]0.87 alloy fibers; ferromagnetic properties
