Preparation of high-density iron soft magnetic materials by HVC technology

High density green compacts of annealed iron powder with a density of 7.70 g·cm^-3 were prepared by high velocity compaction(HVC) combined with powder annealing. Iron soft magnetic materials with high performance and high density were obtained after sintering. The HVC behavior of the annealed powder was investigated,and the effects of sintering temperature and sintering time on the magnetic properties and grain size of the soft magnetic materials were studied. The results show that the density of the green compacts increases with increasing compaction velocity,and the maximum density is 7.70 g·cm^-3(relative density of 98.10%). Specimens sintered at 1450℃ for 4 h have the optimum magnetic properties,with the sinter density of 7.85 g·cm^-3(relative density 99.96%),the maximum permeability of 13.60 m H·m^-1,the saturation induction of 1.87 T,and the coercive force of 56.50 A·m^-1.