(華中科技大學 電子科學與技術系, 武漢 430074)
摘 要: 采用扁平化工藝以及絕緣包覆工藝對鐵硅鋁系軟磁合金粉末進行改性。 對實驗樣品進行掃描電鏡分析， 觀察顆粒形貌對材料性能的影響； 探討球磨時間以及不同絕緣介質含量對于材料電磁性能的影響規(guī)律。 根據(jù)單層吸波材料(含導電襯底)對電磁波的反射率公式的分析以及對不同樣品反射率的計算可知， 球磨扁平化工藝以及絕緣包覆工藝可有效地改善鐵硅鋁金屬粉末的微波吸收性能。 經改性后的鐵硅鋁系軟磁金屬粉末在1.0~3.5 GHz頻段具有較好的吸波性能， 可應用于抗電磁干擾領域。
關鍵字: Fe-Si-Al系合金； 扁平化處理； 包覆工藝； 反射系數(shù)
（Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China）
Abstract: By flattening the metallic materials and by means of a chemical coating method, the anti-electromagnetic interference characteristic of the Fe-Si-Al magnetic alloy powder can be improved. The influence of different flattening time and the different additive contents of insulative materials on electro-magnetic parameters of Fe-Si-Al magnetic alloy powders were discussed. The formulas of reflection coefficient of absorbing materials with conduction bases was analysed. The results shows that this materials can be used as absorbing materials on 1.0-3.5 GHz.
Key words: Fe-Si-Al magnetic alloy powders; flattening; chemical coating method; reflection coefficient
