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均匀纺锤形α-FeOOH微晶,是合成γ-Fe_2O_3和α-Fe磁粉的前躯.纺锤形磁粉的磁学性能较之针形磁粉优良.它在外磁场作用下,能产生均匀磁化,其内部不产生磁极,表面平整,分散性好.因而,纺锤形磁粉是高记录密度的理想材料.其次,若将其轴比控制合适,既适用于现时通用的平行磁记录方式,也可适用于正在改进的垂直磁记录方式.均匀纺锤形氧化铁微晶生长方法,一是采用水热法或强迫水解法,使三价铁盐水解结晶析出无孔洞的α-Fe_2O_3.此法省略了传统磁粉生产过程中铁黄脱水工艺,因而可消除脱水
The uniform spindle-shaped α-FeOOH crystallites are the precursors for the synthesis of γ-Fe_2O_3 and α-Fe magnetic powders. The magnetic properties of spindle-shaped magnetic powders are better than that of acicular magnetic powders, which produce uniform magnetization under the action of external magnetic field. No magnetic pole, smooth surface, good dispersion, so the spindle magnetic powder is ideal for high recording density.Secondly, if the axial ratio control is suitable for both the current common parallel magnetic recording method, can also be applied to Improved vertical magnetic recording method.A uniform spindle-shaped iron oxide crystallite growth method, one is hydrothermal method or forced hydrolysis method, the ferric salt hydrolysis crystallization of non-porous α-Fe_2O_3 This method omits the traditional magnetic powder production Process yellow iron dehydration process, which can eliminate dehydration