Abstract
The sintering behavior of an acicular NiZn-ferrite powder was examined with special emphasis on the relation between densification and microstructure development. The acicular powder prepared by the flux method was formed by uniaxial pressing or extrusion. The densification of the acicular powder was characterized by (1) attainment of high density above 1000°C, (2) anisotropic shrinkage, and (3) formation of closed pores at high densities. Particle orientation in green compacts and particle rearrangement during the early stage of sintering caused anisotropic shrinkage. Small irregularity in pore structure retained pores open to high densities. The uniform distribution of pores in the green compacts resulted in high sintered density. The densification rate was discussed not only by pore size but also by pore/grain size ratio.
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