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首页> 外文期刊>Magnetics, IEEE Transactions on >Magnetic Shielding Effectiveness of Iron-Based Amorphous Alloys and Nanocrystalline Composites
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Magnetic Shielding Effectiveness of Iron-Based Amorphous Alloys and Nanocrystalline Composites

机译：铁基非晶态合金与纳米晶复合材料的磁屏蔽效能

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This paper refers to magnetic field shielding effectiveness $S_{rm H}$ of the selected iron-based amorphous alloys and some magnetic composites. The measurement conditions were chosen regarding the potential sources such as energetic lines or electric devices. As it was shown, the shields made of amorphous and optimized (in amorphous phase) melt spun ribbons can be applied as highly efficient and flexible shields. In the group of the tested alloys, the highest $S_{rm H}$ reveal (at $H=110$ A/m and $f=55$ Hz): Fe$_{84}$ Cr$_{2}$ ${rm B}_{14}$ (95%) and optimized Fe$_{72}$ Co$_{10}$ Nb$_{6}$ B$_{14}$ (97%) and Fe$_{80}$ Nb$_{6}$ B$_{14}$ (92%). In the case of the tested composites, a significant decrease of $S_{rm H}$ was observed. The shielding effectiveness decreases with decreasing size of magnetic addition due to breaking magnetic flux circuit and dipolar interactions between particles. For the composite with magnetic flakes of 4 mm in diameter $S_{rm H}$ is about 60%; therefore, it can be applied as coatings in order to fulfill human protective standards. For the composites with micro and nano-sized magnetic powder $S_{rm H}$ does not depend of the composition which suggests that a response to a magnetic field is fully influenced by the demagnetization effect.
机译：本文涉及选定的铁基非晶合金和某些磁性复合材料的磁场屏蔽效能$ S_ {rm H} $。选择测量条件时要考虑潜在的来源，例如高能线或电气设备。如图所示，由非晶态和优化（非晶态）熔融纺丝带制成的屏蔽层可以用作高效，柔性的屏蔽层。在经过测试的合金组中，最高的$ S_ {rm H} $显露（在$ H = 110 $ A / m和$ f = 55 $ Hz的情况下）：Fe $ _ {84} $ Cr $ _ {{2} $ $ {rm B} _ {14} $（95％）和优化的Fe $ _ {72} $ Co $ _ {10} $ Nb $ _ {66 $ B $ _ {14} $（97％）和Fe $ _ {80} $ Nb $ _ {6} $ B $ _ {14} $（92％）。在测试的复合材料的情况下，观察到$ S_ {rm H} $显着下降。随着磁通回路的中断和粒子之间的偶极相互作用，屏蔽效果随着磁添加量的减小而降低。对于具有直径为4 mm的磁性薄片的复合材料，$ S_ {rm H} $约为60％；因此，它可以用作涂料以满足人类保护标准。对于具有微米和纳米尺寸的磁性粉末的复合材料，$ S_ {rm H} $不取决于组成，这表明对磁场的响应完全受去磁作用的影响。

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