有机凝胶-热还原法制备FeNiCo三元合金微细纤维  

Preparation of Fine Fibers of the FeNiCo Ternary Alloy by the Organic Gel-Thermal Reduction Process

作　　者：曹凯[1] 沈湘黔[1] 沈绛英[2] 景茂祥[1] 

机构地区：[1]江苏大学材料学院,江苏镇江212013 [2]江苏大学药学院,江苏镇江212013

出　　处：《稀有金属材料与工程》2008年第A01期56-59,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(50474038;50674048)

摘　　要：以柠檬酸和金属盐为原料,采用有机凝胶-热还原法成功制备了FeNiCo合金微细纤维。通过FTIR,XRD,TG/DSC,SEM和VSM对纤维先躯体凝胶的结构、物相组成、热分解过程、热处理后产物的形貌及磁性能进行了表征。结果表明,凝胶的可纺性主要与凝胶中金属羧酸盐分子结构有关。柠檬酸根阴离子单齿配位于Co^(2+),Ni^(2+)和Fe^(3+)离子形成线型分子[(C_6H_6O_7)_5(FeNiCo)_2]_n,由这些线型分子组成的凝胶显示出了良好的可纺性。在柠檬酸铁镍钴凝胶中,主要是通过金属离子架桥作用,桥联着柠檬酸根形成线性分子结构。先驱体纤维经800℃氢气和氮气气氛下还原1h后形成了晶粒细小、直径均匀的Fe_(0.33)Ni_(0.33)Co_(0.33)合金微细纤维。合金微细纤维的饱和磁化强度为130.17 A·m^2·kg^(-1),矫顽力为4129A·m^(-1)。The fine fibers of FeNiCo ternary alloy have been prepared by the organic gel-thermal reduction process from critic acid and metal salts. The structure, thermal decomposition process and morphologies of the gel precursors and the fibers derived from thermal reduction of these gel precursors were characterized by FTIR, XRD, TG/DSC and SEM. The magnetic properties of the FeNiCo ternary alloy fine fibers were investigated by VSM. The gel spinnability largely depended on the molecular structures of the carboxylates formed in the gel, which are of the linear-type structural molecules [（C6H6O7）5（FeNiCo）2]n. The fibrous gel precursors transformed to the Fe0.33Ni0.33Co0.33 ternary alloy fibers after thermal reduction at 800 ℃ in H2＋N2 atmosphere for 1 h. The fibers were smooth in surface, consisting of superfine crystallines, and were 1-5 μm in diameter. The fibers have a saturated magnetization 130.17 A·m^2·kg^-1 and a coercivity of 4129 A·m^-1.

关 键 词：FeNiCo合金纤维 有机凝胶-热还原法 热还原 磁性能 

分 类 号：TQ343[化学工程—化纤工业]