Sintering of High Density Ferrite by HIP

Abstract

Magnetic head requires high density ferrite. Among various methods, hot isostatic pressing or HIP is most suitable one for the densification of ferrite, especially Mn-Zn ferrite. Like many other ceramics, in most cases, presintered ferrite block is HIP'ed without capsule. Crucial issues for ferrite are heating/cooling speed and atmosphere control. Atmosphere at HIP is controlled by ferrite powder, in which presintered ferrite block is embeded. Otherwise, Oxygen containing Argon gas is used as pressure/heat medium instead of pure Argon.