【摘要】 以硫酸亚铁、硝酸钴、硫酸镍、碳酸钠和石墨微球为主要原料,利用非均相沉淀工艺分别制备出水合氧化铁、碱式碳酸钴和碱式碳酸镍包裹石墨微球的前驱体复合微球;然后将前驱体复合微球于600℃热还原处理2 h,分别得到了钴铁、铁镍和钴镍磁性纳米合金颗粒层均匀包裹石墨微球的粉体材料。利用SEM,EDS,XRD对前驱体复合微球和核壳结构石墨/磁性纳米合金复合微球的形貌、成分、物相进行了表征,利用VSM对核壳结构石墨/磁性纳米合金复合微球的磁性能进行了研究。这些核壳结构复合微球的磁性合金颗粒层分别由晶粒为37.9 nm的Co_0.5 Fe_0.5、38.5 nm的Fe_0.5Ni_0.5和38.2 nm的Co_0.5Ni_0.5组成,相应的矫顽力分别为36676,20972,16894A/m。更多还原

【Abstract】 Amorphous graphite microspheres were coated by Fe₂O₃·nH₂O-,Co₂（OH）₂CO_3- and NiCO₃·2Ni（OH）₂·2H₂O via the aqueous heterogeneous precipitation of ferrous（Ⅱ） sulfate,cobalt nitrate,nickel sulfate,sodium carbonate and spherical graphite.The magnetic nanocrystalline CoFe-,FeNi- and CoNi were formed on the graphite microspheres by the subsequent hydrogen reduction of the precursors coated on the microspheres at 600℃for 2 h.The morphology,composition,the precursors and the resultant core-shell structural graphite/ magnetic nanocrystalline microspheres were characterized by scanning electron microscopy（SEM）,energy dispersive spectroscopy（EDS） and X-ray diffraction（XRD）.The magnetic properties of the graphite/magnetic nanocrystallines were studied by vibrating sample magnetometer（VSM）.The coatings on graphite consist of 37.9 nm Co_0.5Fe_0.5,38.5 nm Fe_0.5Ni_0.5 and 38.2 nm Co_0.5Ni_0.5, with their corresponding coercivity value of 36676,20972,and 16894 A/m,respectively.更多还原