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前言磁粉是生产盒式录音带、立体声广播带、计算机磁带、录象带和磁盘的重要原材料。目前世界上普遍采用由α-FeOOH粒子制备γ-Fe_2O_3磁粉的传统工艺。近年来,为制备轴比大、粒子均匀和易分散的γ-Fe_2O_3,人们对传统工艺的各个环节进行了大量的研究和改进,使γ-Fe_2O_3磁粉的性能得到了大幅度地提高。但在粒子的均匀性和分散性方面,仍未获得根本解决。采用氯化亚铁代替硫酸亚铁,制备针状γ-FeOOH粒子(纤铁矿),然后由γ-FeOOH粒子制得的γ-Fe_2O_3磁粉,具有轴比大,粒度均匀,很少有枝权和孔洞,而且易分散,定向率高等特点。所以这种制备γ-Fe_2O_3磁粉的新工艺,普遍受到人们的重视。
Introduction Magnetic powder is an important raw material for the production of audio cassettes, stereo broadcast tapes, computer tapes, video tapes and disks. At present, the traditional process of preparing γ-Fe 2 O 3 magnetic particles from α-FeOOH particles is widely used in the world. In recent years, in order to prepare γ-Fe 2 O 3 with large axial ratio, uniform particle size and easy dispersion, a great deal of researches and improvements have been made in all aspects of the traditional process, so that the performance of the γ-Fe 2 O 3 magnetic powder has been greatly improved. But in the particle uniformity and dispersion, has not been fundamentally resolved. Using ferrous chloride instead of ferrous sulfate to prepare acicular γ-FeOOH particles (lepidocrocite), and then made from γ-FeOOH particles γ-Fe 2 O 3 magnetic particles, with a large axial ratio, uniform size, very few branches And holes, and easy to disperse, high rate of orientation. Therefore, this preparation of γ-Fe 2 O 3 magnetic powder new technology, generally by people’s attention.