Novel Method for Coating Magnetic Iron Oxide Particles with Carbon Black
Novel Method for Coating Magnetic Iron Oxide Particles with Carbon Black
复制标题
用炭黑包覆磁性氧化铁颗粒的新方法
DOI：
10.1111/j.1151-2916.2000.tb01658.x
复制
发表时间：
2000
影响因子：
3.9
通讯作者：
K. Okuyama
中科院分区：
文献类型：
--
作者：
Kazuyuki Hayashi;M. Kamigaki;H. Morii;K. Okuyama
为了生产更好的磁带材料，需要更细的磁性颗粒、更高的矫顽力、更高的黑度和更低的电阻。本文报道了一种用胶粘剂对氧化铁颗粒涂覆炭黑的新方法。使用记录层中的涂覆颗粒制备的磁带在光透明度和电阻方面均有改善。当颗粒重量的~ 5%为炭黑时，相对于传统制备的胶带，透明度降低~ 20%，电阻降低~ 1个数量级。磁性氧化铁颗粒在磁性漆中的分散性优于未涂覆的磁性氧化铁颗粒，从而提高了表面光滑度和取向比。与传统制备层相比，也获得了更高的电磁性能。透射电镜照片表明，所有的炭黑都牢固地结合在磁性氧化铁颗粒的表面，形成一个独特的层。
Magnetic particles with finer size, higher coercive force, higher blackness, and lower electrical resistance are required to produce better magnetic tape materials. A new method to coat iron oxide particles with carbon black using an adhesive agent is reported in this paper. Magnetic tapes prepared using the coated particles in the recording layer exhibit improvements in both light transparency and electrical resistance. A decrease in transparency of ∼20% and a reduction in electrical resistance of ∼1 order of magnitude relative to conventionally prepared tapes are achieved when ∼5% of the particle weight is carbon black. Surface smoothness and the orientation ratio are also improved because the dispersibility of these particles in magnetic lacquer is better than that of uncoated magnetic iron oxide particles. Higher electromagnetic performance relative to the conventionally prepared layers is also obtained. TEM photographs indicate that all the carbon black is firmly bound to the surface of the magnetic iron oxide particles in a distinct layer.