High magnetic performance of metal injection-molded pure iron using δ phase sintering

• High-performance pure iron was produced by metal injection molding.
• The δ phase sintering improved the density and magnetic properties greatly.
• The magnetic properties were found to be closely related to density and grain size.

Using atomized iron powder as raw materials, pure iron soft magnetic material was prepared by metal injection molding and δ phase sintering. The δ phase sintering improved the density and magnetic properties greatly. The specimen with nearly full density and the maximum permeability of 17,400, magnetic induction (B6000) of 1.81 T and coercive force of 20.6 A/m was achieved after sintering at 1450 °C for 6 h. The magnetic properties were comparable to those of wrought pure iron.