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通过对伪核壳结构的Ni-Fe合金@MnZnFeO粉末进行放电等离子烧结制备软磁复合材料

Producing Soft Magnetic Composites by Spark Plasma Sintering of Pseudo Core-Shell Ni-Fe Alloy@MnZnFeO Powders.

作者信息

Cotojman Loredana, Marinca Traian Florin, Popa Florin, Neamțu Bogdan Viorel, Prică Virgiliu Călin, Chicinaș Ionel

机构信息

Materials Science and Engineering Department, Technical University of Cluj-Napoca, 400641 Cluj-Napoca, Romania.

出版信息

Materials (Basel). 2023 Jan 4;16(2):501. doi: 10.3390/ma16020501.

DOI:10.3390/ma16020501
PMID:36676237
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9862317/
Abstract

Soft magnetic composite (SMC) cores have been obtained by Spark Plasma Sintering (SPS) using pseudo core-shell powders. Pseudo core-shell powders are formed by a core of soft magnetic particle (nanocrystalline permalloy or supermalloy) surrounded by a thin layer (shell) of nanosized soft ferrite (MnZnFeO). Three compositions of pseudo core-shell powders were prepared, with 1, 2 and 3 wt.% of manganese-zinc mixt ferrite. The pseudo core-shell powders were compacted by SPS at temperatures between 500 and 700 °C, with a holding time ranging from 0 to 10 min. Several techniques have been used for characterization of the samples, both, powders and compacts X-ray diffraction (XRD, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), magnetic hysteresis measurements (DC and AC) and electrical resistivity. The electrical resistivity is in the order of 1 × 10 Ωm, 3-4 orders of magnitude higher than supermalloy electrical resistivity. The SPS at lower temperatures (500 °C) conserves the initial phases of the composite, but increasing the sintering temperature and/or sintering time produces a solid-state reaction between the alloy and ferrite phases, with negative consequence on the magnetic properties of the compacts. The initial relative permeability is around 40 and remains constant until to 2000 Hz. The power losses are lower than 2 W/kg until to 2000 Hz.

摘要

通过火花等离子烧结（SPS）使用伪核壳粉末获得了软磁复合材料（SMC）磁芯。伪核壳粉末由软磁颗粒（纳米晶坡莫合金或超坡莫合金）的核组成，其周围是纳米尺寸的软铁氧体（MnZnFeO）的薄层（壳）。制备了三种组成的伪核壳粉末，分别含有1 wt.%、2 wt.%和3 wt.%的锰锌混合铁氧体。伪核壳粉末在500至700°C的温度下通过SPS进行压实，保温时间为0至10分钟。已经使用了几种技术对样品进行表征，包括粉末和压块的X射线衍射（XRD）、扫描电子显微镜（SEM）、能量色散X射线光谱（EDX）、磁滞测量（直流和交流）以及电阻率。电阻率约为1×10Ωm，比超坡莫合金的电阻率高3 - 4个数量级。在较低温度（500°C）下进行SPS可保留复合材料的初始相，但提高烧结温度和/或烧结时间会在合金相和铁氧体相之间产生固态反应，对压块的磁性能产生负面影响。初始相对磁导率约为40，直到2000 Hz保持恒定。直到2000 Hz，功率损耗低于2 W/kg。

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本文引用的文献

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Soft magnetic materials for a sustainable and electrified world.用于可持续和电气化世界的软磁材料。
Science. 2018 Oct 26;362(6413). doi: 10.1126/science.aao0195.