一种具有良好直流叠加特性的Fe_(95)Si_1B_2P_(0.5)Cu_(1.5)磁粉芯的制备（英文）

Preparation of a Kind of Fe_(95)Si_1B_2P_(0.5)Cu_(1.5) Magnetic Powder Core with Optimal DC-bias Property

采用片状Fe_(95)Si_1B_2P_(0.5)Cu_(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。结果表明,经450℃/1 h退火处理后,Fe_(95)Si_1B_2P_(0.5)Cu_(1.5)磁粉芯的磁导率在1～200 kHz频率范围内具有良好的频率稳定性,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增大,磁粉芯的有效磁导率逐渐下降,当外加直流磁场强度H=4 kA/m时,有效磁导率μe维持在70%以上,当H继续增大到10.4 kA/m时,μe仍大于20,表明磁粉芯具有良好的直流叠加特性。

Fe-Si system metal magnetic powder core was prepared from flaky Fe95Si1B2P0.5Cu1.5 alloy powders instead of the spherical Fe-6.5%Si alloy powders. Firstly, the preparation of Fe95Si1B2P0.5Cu1.5 alloy powders and Fe95Si1B2P0.5Cu1.5 magnetic powder core was studied, and then the influences of annealing temperature and forming pressure on soft magnetic properties of the magnetic powder core were investigated. The result shows that the permeability(μ e) of Fe95Si1B2P0.5Cu1.5 magnetic powder core has optimal stability of frequency in the frequency range of 1~200 kHz. Residual internal stress produced in the pressing process is fully released after annealing at 450 °C for 1 h, which could significantly improve the permeability(μ e) of the magnetic powder core, and the maximum value is 53 at forming pressure of 1.74 GPa. With the increase of the applied DC magnetic field, the permeability of the magnetic powder core decreases gradually. When the DC magnetic field(H) is 4 kA/m, the percentage permeability of the magnetic powder core remains higher than 70%. As H increases to 10.4 kA/m, the permeability of magnetic powder core is still greater than 20. This shows that Fe95Si1B2P0.5Cu1.5 magnetic power core has optimal DC-bias property.