一种具有良好直流叠加特性的Fe95Si1B2P0.5Cu1.5磁粉芯

A Kind of Fe95Si1B2P0.5Cu1.5 Magnetic Powder Core with Optimal DC-bias Property

摘要:

：本文采用片状Fe₉₅Si₁B₂P_0.5Cu_1.5合金粉体替代球形Fe-6.5%Si合金粉体,制备了FeSi系金属磁粉芯,研究了合金粉及磁粉芯的制备,退火温度和成型压力对磁粉芯的软磁性能的影响情况。研究结果表明,Fe₉₅Si₁B₂P_0.5Cu_1.5磁粉芯的磁导率在1~200kHz频率范围内具有良好的频率稳定性,经450℃×1h退火处理后,磁粉芯内部残余内应力得到充分的释放,其有效磁导率μe得到大幅的提升,成型压力为1.74GPa时,最大值达到53。随着外加直流磁场强度的逐渐变大,磁粉芯的磁导率逐渐下降,当外加直流磁场强度H=50Oe时,有效磁导率μe维持在70%以上,当H继续增大到130Oe时,μe仍大于20,表明磁粉芯具有良好的直流叠加特性。

Abstract:

In this thesis, Fe-Si system metal magnetic powder core was prepared from flaky Fe₉₅Si₁B₂P_0.5Cu_1.5 alloy powders instead of the spherical Fe-6.5%Si alloy powders. Firstly, the preparation of Fe₉₅Si₁B₂P_0.5Cu_1.5 alloy powders and Fe₉₅Si₁B₂P_0.5Cu_1.5 magnetic powder core were studied, and then the influences of annealing temperature and forming pressures on soft magnetic properties of the magnetic powder core were systematically investigated. Research showed that the permeability (μe) of Fe₉₅Si₁B₂P_0.5Cu_1.5 magnetic powder core had optimal stability of frequency in the frequency range of 1~200kHz. Residual internal stress produced in the pressing process was fully released after annealing at 450℃ for 1h, which could significantly improve the permeability (μe) of the magnetic powder core, and the maximum value was 53 with a forming pressure of 1.74GPa. With the increase of the applied DC magnetic field level, the permeability of the magnetic powder core decreased gradually. When DC magnetic field levels(H) was 50Oe, the percentage permeability of the magnetic powder core remain higher than 70%, As H increase to 130Oe, the permeability of magnetic powder core was still greater than 20. This showed that Fe₉₅Si₁B₂P_0.5Cu_1.5 magnetic power core had optimal DC-bias property.