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高温退火对高饱和磁感应强度Fe-Co合金磁性能的影响

     

摘要

Effect of high temperature annealing on the quality and magnetic properties of Fe-Co alloys with high saturation magnetic induction was studied. The results showed that the quality and magnetic properties did not change significantly when the alloy annealed below 500 ℃. However, the quality increased and the magnetic properties decreased significantly when the alloy annealed over 500 ℃. When annealed at 600 ℃ for 4h, Bs of alloys decreased to 2178mT and Hc increased to 76. lA/m. The study of microstructure revealed that the effect of high temperature annealing on the grain of alloys was small, and the surface of alloys consisted of Fe3O4. The decreasing of magnetic properties for Fe-Co alloys after high temperature annealing may due to the increase of oxides and impurities.%对具有高饱和磁感应强度的1J22型Fe-Co软磁合金进行高温退火实验,并研究了其质量、磁性能随退火温度及时间的变化.结果表明,合金在500℃以下退火时,质量无明显增加且磁体磁性能并无降低;而当合金在500℃以上退火后,合金增重速率增加,且磁性能明显下降.当合金在600℃退火后,合金饱和磁感应强度Bs降至2178mT,矫顽力Hc增至76.1A/m.微观结构研究表明,高温退火后合金晶粒尺寸及形貌无明显变化,而合金表面完全生成Fe3O4.合金磁性能的降低是由氧化物的增多及杂质的引入造成的.

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