Effects of Granule Size of MnZn Ferrite Particles on the Filling and Compaction Properties

Abstract

As for the manufacturing process of ferrite, it is of prime importance to uniformly fill granules into dies and to obtain uniform green compact. In this study, the effect of granule size on the filling and compaction behaviors has been studies for MnZn ferrite with special reference to the green microstructure. In the case that granule size is large, filled density of the die-leg decrease with the decrease of leg width of the die. On the contrary, in the case of smaller granules, the pressure at which the granules start to deform is lower than that of the larger granules, and the difference of green density between upper side and lower side shows an increase. The bending strength of green compact becomes large as granule size becomes small.