磁性酸化鉄粉の混練時における破砕効果

概要

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The objective of this investigation was to study the pulvarization effect of the grinding process of γ-Fe2O3 powders, which was used in magnetic tapes. In general, the particles of these powder were in acicular shape. The initial sizes, varying from 0.3 to 0.4 microns in length were reduced in 312 hours of grinding to average particle sizes about 0.14μ, and the particles turned cubic in shape. The coercivity, saturation induction and residual induction of the powders were reduced through-out the run. The magnetic tapes which were produced by using these ground powders have shown the decrease of frequency sensitivity and layer-to-layer signal transfer with increase of grinding time.