Warm Compaction of Nanostructured Fe powder

Abstract

In recent years, a rapid increase in demands for the soft magnetic composite parts has been created and it has been tried to improve their properties by various processing methods, alloying elements and compaction parameters. To produce a compressed powder magnetic core without sintering, high compacting pressures should be applied. Because of the presence of polymer materials such as epoxy insulating materials, sintering process can not be used. For this reason the elimination of residual stresses in the compaction step is very important. Various approaches have been proposed to increase the green density. Warm compaction method has been used for the reduction of residual stress, the improvement of magnetic properties and the higher densities. In this work, the effects of warm compaction and particle size on magnetic properties of Fe powder core were investigated. Ball-milled Fe oxide powder for 30 hours, Fe oxide was reduced through hydrogen reduction process.