Microstructure and magnetic properties of high density P/M pure iron

• High-density pure iron was produced by high-density forming technology.
• The magnetic properties were closely related to density and microstructure.
• High magnetic performance P/M pure iron was got by means of δ phase sintering.

P/M high density pure iron with excellent magnetic properties was prepared by the combination of high density forming technology and heat treatment. The effects of sintering parameters on microstructural evolution and magnetic properties of sintered pure iron were investigated. The results showed that the grain sizes of the samples increased with increasing sintering temperature and time, facilitating the enhancement of permeability and the decrease of coercive force. When the specimens were sintered at 1450 °C for 4 h, the maximum permeability reached 10,746, and saturation induction of 1.85 T and coercive force of 50.12 A/m were achieved.

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