低损耗FeSiBPC非晶磁粉芯的制备及磁性能研究

FABRICATION AND MAGNETIC PROPERTIES OF FeSiBPC AMORPHOUS POWDER CORES WITH ULTRA-LOW CORE LOSS

采用高压水雾化方法制备了成分为(Fe0.76Si0.09B0.10P0.05)98C2的非晶粉末,由该成分非晶粉末制备出的磁粉芯具有较高的抗直流偏置性能及优异的损耗特性。研究了制备工艺对样品磁性能的影响。研究结果表明,非晶磁粉芯压制后的去应力退火处理能够有效的提高磁导率和降低损耗,过高的热处理温度会使非晶粉末晶化,导致涡流损耗急剧升高,恶化磁性能,最佳的退火温度为693K,绝缘包覆是制备高性能磁粉芯的必备工艺,通过最优化工艺制备的磁粉芯,其损耗为Pcv=320kW/m3(f=100kHz,Bm=0.1T),抗直流偏置性能为:在H=100Οe(1Oe=7.9578×10A/m)外加磁场下,磁导率μa=60的磁粉芯样品对应电感下降为原感值的60%。通过与同规格其他类型磁粉芯的对比,发现FeSiBPC非晶磁粉芯具有极低的损耗及优异的高频磁性能。

The high pressure water-atomized （Fe0.76 Si0.09 B0.10 P0.05 ）98 C2 amorphous powder cores with superior DC-bias properties and low loss characteristics were prepared. The effects of processing parameters on the magnetic properties were studied. The annealed amorphous powder cores after compaction promote magnetic permeability and loss characteristics effectively. Over-annealing treatment result in a crystallization of the amorphous powders, which deteriorate magnetic properties by increasing the loss of the eddy current. The optimum annealing temperature is 693K. The insulation coating is an effective process to fabricate magnetic powder cores with superior magnetic properties. The lowest core loss of 320kW/mg（f= 100 kHz, Bm=0. 1T） is obtained with the optimal preparation process. FeSiBPC amorphous powder cores exhibit an excellent direct-current overlapping characteristic at a flow of large current with a percent permeability of about 60% at the field of H=100 Oe for/L= 60. The FeSiBPC amorphous powder cores exhibit the ultra-low core loss and superior properties at high frequency （〉1MHz） compared with other powder cores.