FeCo Nanowire–Strontium Ferrite Powder Composites for Permanent Magnets with High-Energy Products,ACS Applied Nano Materials

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FeCo Nanowire–Strontium Ferrite Powder Composites for Permanent Magnets with High-Energy Products
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-09-11 , DOI: 10.1021/acsanm.0c01905
J. C. Guzmán-Mínguez ₁ , S. Ruiz-Gómez ₂ , L. M. Vicente-Arche _{1,

3} , C. Granados-Miralles ₁ , C. Fernández-González ₄ , F. Mompeán ₅ , M. García-Hernández ₅ , S. Erohkin ₆ , D. Berkov ₆ , D. Mishra _{7,

8} , C. de Julián Fernández ₇ , J. F. Fernández ₁ , L. Pérez _{3,

4} , A. Quesada ₁

Affiliation

Due to the issues associated with rare-earth elements, there arises a strong need for magnets with properties between those of ferrites and rare-earth magnets that could substitute the latter in selected applications. Here, we produce a high remanent magnetization composite bonded magnet by mixing FeCo nanowire powders with hexaferrite particles. In the first step, metallic nanowires with diameters between 30 and 100 nm and length of at least 2 μm are fabricated by electrodeposition. The oriented as-synthesized nanowires show remanence ratios above 0.76 and coercivities above 199 kA/m and resist core oxidation up to 300 °C due to the existence of a >8 nm thin oxide passivating shell. In the second step, a composite powder is fabricated by mixing the nanowires with hexaferrite particles. After the optimal nanowire diameter and composite composition are selected, a bonded magnet is produced. The resulting magnet presents a 20% increase in remanence and an enhancement of the energy product of 48% with respect to a pure hexaferrite (strontium ferrite) magnet. These results put nanowire–ferrite composites at the forefront as candidate materials for alternative magnets for substitution of rare earths in applications that operate with moderate magnet performance.

中文翻译：

FeCo纳米线–锶铁氧体粉末复合材料，用于具有高能产品的永磁体

由于与稀土元素相关的问题，强烈需要具有在铁氧体和稀土磁体之间的性能的磁体，以在选定的应用中替代后者。在这里，我们通过将FeCo纳米线粉末与六价铁氧体颗粒混合来生产高剩磁化复合粘结磁体。在第一步中，通过电沉积来制造直径在30到100 nm之间且长度至少为2μm的金属纳米线。取向的合成纳米线的剩磁比大于0.76，矫顽力大于199 kA / m，并且由于存在> 8 nm的薄氧化物钝化壳，可抵抗高达300°C的核心氧化。在第二步中，通过将纳米线与六价铁氧体颗粒混合来制造复合粉末。选择最佳的纳米线直径和复合材料成分后，便产生了粘结磁体。相对于纯六方铁氧体（锶铁氧体）磁体，所得磁体的剩磁增加了20％，能量积提高了48％。这些结果使纳米线-铁氧体复合材料成为替代磁体的候选材料，从而替代了在中等磁体性能的应用中替代稀土的材料。

更新日期：2020-10-25

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