CAJ | 학술논문

采用溶胶?凝胶结合静电仿丝技术制备Co0.5Ni0.5Fe2O4纳米纤维，然后将其氢热还原合成了一系列不同合金含量、平均直径在67~85 nm的Fe-Co-Ni合金/Co0.5Ni0.5Fe2O4复合纳米纤维。采用TG-DTA、XRD、FE-SEM、TEM和VSM对所得纤维样品进行表征。结果表明：随着还原温度由290℃升高到350℃，纤维直径逐渐减小，微观形貌向串珠状结构演变，还原产物中 Fe-Co-Ni 合金的质量分数由15.2%逐步增加到约95.7%；所制得的Fe-Co-Ni 合金/Co0.5Ni0.5Fe2O4复合纳米纤维的两磁性相晶粒间具有良好的磁交换耦合，其磁化行为如同单相磁性材料的；随Fe-Co-Ni合金含量的增加，其饱和磁化强度和剩磁均增大，而相应的矫顽力则呈现出一个先增大后减小的变化趋势；Fe-Co-Ni合金相的形成不仅能够明显提高复合纳米纤维的软磁性能，而且通过调节其含量还可有效实现对材料磁参数的宽范围调控。
채용용효?응효결합정전방사기술제비Co0.5Ni0.5Fe2O4납미섬유，연후장기경열환원합성료일계렬불동합금함량、평균직경재67~85 nm적Fe-Co-Ni합금/Co0.5Ni0.5Fe2O4복합납미섬유。채용TG-DTA、XRD、FE-SEM、TEM화VSM대소득섬유양품진행표정。결과표명：수착환원온도유290℃승고도350℃，섬유직경축점감소，미관형모향천주상결구연변，환원산물중 Fe-Co-Ni 합금적질량분수유15.2%축보증가도약95.7%；소제득적Fe-Co-Ni 합금/Co0.5Ni0.5Fe2O4복합납미섬유적량자성상정립간구유량호적자교환우합，기자화행위여동단상자성재료적；수Fe-Co-Ni합금함량적증가，기포화자화강도화잉자균증대，이상응적교완력칙정현출일개선증대후감소적변화추세；Fe-Co-Ni합금상적형성불부능구명현제고복합납미섬유적연자성능，이차통과조절기함량환가유효실현대재료자삼수적관범위조공。
A series of Fe-Co-Ni alloy/Co0.5Ni0.5Fe2O4 composite nanofibers with average diameters from 67 to 85 nm and various alloy contents were synthesized by hydrogen-thermal reduction of Co0.5Ni0.5Fe2O4 nanofibers prepared via sol-gel methode and electrospinning. The obtained nanofiber samples were characterized by TG-DTA, XRD, FE-SEM, TEM and VSM. The results show that the mass fraction of Fe-Co-Ni alloys in the reduced products progressively increases from 15.2%to about 95.7%with increasing the reduction temperature of Co0.5Ni0.5Fe2O4 nanofibers from 290℃to 350 ℃. Meanwhile, the fiber diameter gradually decreases and the fiber surface morphology evolves toward the bead-like structures. The magnetic field dependence of the magnetization behaves as if the as-prepared Fe-Co-Ni alloy/Co0.5Ni0.5Fe2O4 composite nanofibers are single-phase magnetic materials, which indicates that the two magnetic phases in composites are effectively exchange-coupled and that the magnetization of both phases reverses cooperatively. The saturation magnetization and remanence of the samples increase monotonically with the increase of Fe-Co-Ni alloy content, while the corresponding coercivity shows a trend of first increase and then decrease. The formation of Fe-Co-Ni alloy phase can not only obviously improve the soft magnetic performance of the composite nanofibers, but also effectively realize the wide-range control for the magnetic parameters through adjusting the Fe-Co-Ni alloy content in composites.