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盘形硅藻壳的非晶二氧化硅多孔结构具有大比表面积和轻质等属性,将其与高磁导率纯铁材料结合有可能制备出优质磁性功能微粒.利用五羰基铁溶液高温受热分解为金属铁原子和一氧化碳的原理,采用直接滴加和蒸汽载带两种方法,探究金属铁在硅藻壳微粒表面的沉积的可行性.利用 SEM、EDS、XRD、VSM分别对制备的磁性复合微粒的形貌、成分以及静磁特性进行表征.实验结果证实采用五羰基铁热分解约束成形方法可以实现硅藻壳微粒的磁性功能化.蒸汽法成形工艺可以制备出均匀包覆的磁性微粒,其饱和磁化强度达到118 A.m2/kg,矫顽力2．39×104 A/m .

Amorphous silica porous structure of the disk-shaped diatom shell has the property of large specific surface area and light weight.It is possible to prepare a high-quality functional magnetic particles by combining the high permeability ferrite material with diatom shell.In this paper,according to thermal decomposition prin-ciple of iron pentacarbonyl change to iron atoms and carbon monoxide at high temperature,using dropping method and steaming method with N2 carrying,the feasibility of diatom shell particles deposited metal surface iron were explored.The scanning electron microscopy (SEM),energy dispersive X-ray spectrometry (EDS),X-ray diffraction (XRD),and vibrant sample magnetometer (VSM)were used to make clear their morphology microstructure,chemical composition,crystal structure,and magnetostatic characteristic.Experimental results showed that the magnetic functional of diatom shell by thermal decomposition limited forming method of iron pentacarbonyl could be achieved.Moreover,the uniformly iron coated magnetic particles were fabricated by steaming method with N2 carrying with the saturation magnetization Ms at 118 A.m2/kg and coercive force Hc at 2.39×104 A/m.