采用熔炼-铸锭-球磨的方法制备了Fe-Si-Ni粉末,经过预退火热处理、绝缘包覆后将粉末压制成磁粉芯,并对成型后的磁粉芯进行去应力退火处理.对Fe-Si-Ni粉末及磁粉芯的性能系统地进行了检测分析.结果显示:经过预退火处理后的Fe-Si-Ni粉末具有较高的饱和磁化强度(M.).Fe-Si-Ni磁粉芯的有效磁导率(μc)在10～1000kHz的频率范围内变化很小,且随着Ni含量和退火温度的升高而增大.Fe-Si-Ni磁粉芯有着良好的直流叠加特性(dc-bias),当Ni≥5wt.％时,尽管磁导率百分比随着退火温度的升高逐渐减小,然而在外加直流磁场强度为50Oe时,磁粉芯的磁导率百分比均在70％以上.品质因数(Q)随着Ni含量和退火温度的升高逐渐增大,磁芯损耗随着Ni含量和退火温度的升高而减小.当Ni=8wt.％,退火温度为750℃时,磁粉芯在50kHz,50mT下的磁芯损耗有最小值312mW/cm3.
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