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采用快淬法制备了(Fe1-xCox)85Si9.6Al5.4(x=0,0.05,0.10,0.15,0.20,质量分数,%)四元合金薄带,经高能球磨获得扁平化程度良好的微粉.球磨粉在氮气保护下,在773 K退火30min.退火磁粉与适量环氧树脂相混合,在30 MPa下压制成φ19mm×φ10mm×3mm的圆环样品,利用XRD,VSM等研究了Co添加对Fe-Si-Al微粉结构和磁性能的影响.结果表明:添加Co并不改变快淬薄带样品的相结构,但能显著提高居里温度;当x=0.15时,获得最大的饱和磁化强度Ms真为129.8 A·m2/kg,圆环样品在GHz频段均显示良好的抗电磁干扰特性,x=0.15的样品截止频率达到1.154GHz.

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