Abstract
Generally the anisotropic permanent magnet is produced by the magnetic field orientation forming, namely, the compaction of magnetic powders under magnetic field. In the magnetic field orientation forming, there is the close relation in degree of orientation and sintering shrinkage of the compact. The sintering shrinkage is simply obtained from dimensional measurement of green compacts and sintered ones. It is proposed that the saturation value of the sintering shrinkage is made to be evaluation criterion for deciding the strength of applied magnetic field in order to find the optimum condition in the magnetic field orientation forming. Though various factors affect the degree of orientation, it is possible to estimate as those accumulation effect by sintering shrinkage. This evaluation criterion is applicable in case of not only the dry compaction of Sr-ferrite powder under magnetic field but also the forming of the compound mixed with a MIM binder.
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