有机凝胶先驱体转化法制备CoNi合金微细纤维  

Preparation of CoNi Alloy Fine Fibers by the Organic Gel-polymer Derived Process

作　　者：曹凯[1] 沈湘黔[1] 景茂祥[1] 张春野[1] 

机构地区：[1]江苏大学材料学院,江苏镇江212013

出　　处：《材料科学与工程学报》2006年第5期744-746,704,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(50474038)

摘　　要：本文以柠檬酸和金属盐为原料,采用有机凝胶先驱体转化法成功制备了CoNi合金微细纤维。通过FTIR、XRD、TG/DSC和SEM对纤维先躯体凝胶的结构、物相组成、热分解过程及热处理后产物的形貌进行了表征。结果表明,在凝胶形成过程中金属离子可单齿配位于柠檬酸根阴离子,并形成线性分子结构,使凝胶有较好的可纺性;先驱体纤维经650℃氢气还原1小时后形成了晶粒细小、直径可以小于1μm,长度可达1m的均匀铁磁性CoNi合金微细纤维。CoNi合金微细纤维可用于先进聚合物基电磁屏蔽复合材料的填料和雷达吸波材料。CoNi alloy fine fibers had been successfully prepared by the organic gel-polymer derived process from the raw materials of critic acid and metal salts. The structure, thermal decomposition process and morphologies of the gel-polymer precursors and fibers derived from thermal reduction of the gel-polymer precursors were characterized by FTIR, XRD, TG/DSC and SEM, respectively. The gel-polymer spinnability mainly depends on molecular structures of metal-carboxylates formed during the gel-polymer formation. It is reasoned that the gelpolymer consists of linear-type structural molecules and these gel-polymers formed show a good spinnability. The fibrous gel-polymer precursors were transferred into the CoNi alloy fibers after the thermal reduction process at 650% under H2 atmosphere for 1 hour, these fibers were smooth in appearance , superfine in crystalline size, and up to 1 meter in length, less than 1μm and uniform in diameter. These CoNi alloy fine fibers are attractive for use as high performance electromagnetic interference shielding （EMI） and radar absorbing materials.

关 键 词：CoNi合金纤维 有机凝胶先驱体转化法 可纺性 热还原 

分 类 号：TM153[电气工程—电工理论与新技术] TB333[一般工业技术—材料科学与工程]