纳米α-Fe包覆空心玻璃微珠复合微球的制备及磁性能研究  

Fabrication and Magnetic Properties of Nanoα-Fe Coated Cenosphere Composite Microspheres

作　　者：刘为[1] 沈湘黔[1] 李东红[1,2] 景茂祥[1] 李旺兴[2] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]中国铝业股份有限公司郑州研究院,河南郑州450041

出　　处：《稀有金属材料与工程》2008年第A01期382-386,共5页Rare Metal Materials and Engineering

基　　金：江苏大学自然科学创新预研基金(04CX01)

摘　　要：以硫酸亚铁、碳酸氢铵、空心玻璃珠为主要原料,采用非均相沉淀法,通过控制工艺过程参数制备出水合氧化铁均匀包覆空心玻璃珠的复合微球前驱体,然后在(N_2/H_2)气氛下于720℃保温2 h进行热还原处理,得到了表面光滑、晶粒大小约为50 nm的α-Fe包覆空心玻璃珠复合微球。利用SEM、EDS、XRD对包覆前驱体和热还原产物的表面形貌、成分、物相组成进行表征,利用TG/DSC研究包覆前驱体的热分解过程,用振动样品磁强计(VSM)对纳米α-Fe包覆空心玻璃珠复合微球的磁性能进行测试。得出了制备这种复合微球的优化工艺参数。复合微球的磁性能相比于纯α-Fe微粉,其饱和磁化强度相近,矫顽力增加。A precursor was synthesized by the aqueous heterogeneous precipitation using ferrous（Ⅱ ）sulfate, ammonium bicarbonate and cenosphere as the main raw materials. Microspheres of nanosized α-Fe-coated cenospheres of 50 nm iron crystallines were obtained by reduction of the precursor in H2/N2 at 720 ℃ for 2 h. The morphology, composition, phases of the precursor and the resultant composite microspheres were characterized by scanning electron microscopy （SEM）, energy dispersive spectroscopy（EDS） and X-ray diffraction（XRD）, and the thermal decomposition of the precursors were investigated by thermogravimetry-differential scanning calorimetry（TG/DSC）. The magnetic properties of the composite microspheres were studied by vibrating sample magnetometer （VSM）. The processing parameters for the fabrication of the composite microspheres were optimized. The composite microspheres powders exhibited a higher coercivity value compared to that of pure α-Fe powders.

关 键 词：纳米Α-FE 空心玻璃珠复合微球 非均相沉淀 磁性能 

分 类 号：TB34[一般工业技术—材料科学与工程]