高速压制制备高密度纯铁软磁材料

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

以退火纯铁粉末为原料,采用粉末退火结合高速压制技术的方法制得高密度压坯(7.70 g·cm-3),经烧结后获得高密度高性能的纯铁软磁材料.研究退火粉末的高速压制行为,以及烧结时间和烧结温度对材料磁性能和晶粒大小的影响.结果显示:退火粉末的压坯密度随压制速度的增加而增加,压坯密度最高可达到7.70 g·cm-3,相对密度可达到98.10%.烧结温度为1450℃,烧结时间为4 h时,材料密度达到7.85 g·cm-3,相对密度为99.96%,最大磁导率达到13.60 m H·m-1,饱和磁感应强度为1.87 T,矫顽力为56.50 A·m-1.

High density green compacts of annealed iron powder with a density of 7. 70 g·cm- 3were 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 of98. 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 of56. 50 A·m- 1.