Si含量及终轧温度对屏蔽用电磁纯铁磁性能的影响

为优化屏蔽用电磁纯铁的磁性能,研究了Si含量及终轧温度(770~920 ℃)对屏蔽用电磁纯铁磁性能的影响。结果表明,随着硅含量增加到2.0%,最大磁导率先增大后减小,矫顽力与之相反,饱和磁感应强度逐渐减小但减幅较小。随着终轧温度的升高,晶粒中难磁化方向[111]组分先急剧减少后缓慢增多,有利的(110)[001]组分缓慢增多,偏差度先变小后增大。试验钢中磁性能最佳的成分和工艺是含1.4%Si的电磁纯铁840 ℃终轧,1100 ℃退火,其最大磁导率为37.84 mH/m,矫顽力为16.85 A/m,饱和磁感应为1.80 T,在直流低频弱磁场的环境下,屏蔽效能为13.92 dB。

Effect of silicon content and finish rolling temperature on magnetic properties of electromagnetic pure iron for shielding

Effects of Si content and finish rolling temperature( 770-920 ℃) on the electromagnetic properties of electromagnetic pure iron for shielding were investigated in order to optimize such properties. The results show that as the Si content increases to 2. 0%,the maximum magnetic conductivity increases first and then decreases,and the coercive force is the opposite,while the saturation magnetic induction intensity decreases gradually but the decrease is small. With the increasing final rolling temperature,the [111]component in the hard-tomagnetization direction of the grain first decreases sharply and then increases slowly. The favorable( 110) [001]component slowly increases,and the deviation degree first decreases and then increases. The composition and process for the best magnetic properties of the experimental steels are final rolling of electromagnetic pure iron containing 1. 4% Si at 840 ℃ and annealing at 1100 ℃,where the maximum magnetic conductivity is 37. 84 m H/m,the coercive force is 16. 85 A/m,the saturation magnetic induction is 1. 80 T,and the shielding effectiveness is 13. 92 d B in low-frequency DC magnetic field environment.