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通过机械合金化制备钕铁硼和铁铝纳米结构粉末及其表征

Production and Characterization of Nanostructured Powders of NdFeB and FeAl by Mechanical Alloying.

作者信息

Gómez Rodríguez Alvaro Javier, Oyola Lozano Dagoberto, Bustos Rodríguez Humberto, Rojas Martínez Yebrail, Pérez Alcázar German Antonio, Zamora Alfonso Ligia Edith, Trujillo Hernandez Juan Sebastian

机构信息

Departamento de Física, Universidad del Tolima, Ibagué 730006299, Colombia.

Grupo de Metalurgia Física y Teoría de Transiciones de Fase, Departamento de Física, Universidad del Valle, Cali 25360, Colombia.

出版信息

Molecules. 2022 Oct 24;27(21):7190. doi: 10.3390/molecules27217190.

DOI:10.3390/molecules27217190
PMID:36364015
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9656077/
Abstract

The objective of this work is to evaluate the applicability of exchange coupling between nanoparticles of NdFeB (hard magnetic material) and FeAl (soft magnetic material), as permanent magnets produced by surfactant-assisted mechanical alloying. The obtained powders were then mixed with 85% of the NdFeB system and 15% of the FeAl system and subsequently sintered at 300 °C, 400 °C and 500 °C for one hour. The results obtained by Mössbauer spectrometry (MS) show a ferromagnetic behavior with six magnetic sites represented by sextets (16k1, 16k2, 8j1, 8j2, 4c and 4e), characteristic of the NdFeB system. X-ray diffraction (XRD) results show a tetragonal and BCC structure for the NdFeB and FeAl systems, respectively. The results obtained by vibrating sample magnetometry (VSM), for mixtures of the NdFeB and FeAl sy stems sintered at 300 °C, 400 °C and 500 °C, allow for the conclusion that the coercive field (Hc) decreases drastically with temperature and the percentage of soft phase at values of Hc = 132 Oe compared to the coercive field values reported for NdFeB Hc = 6883 Oe, respectively. Images obtained by transmission electron microscopy (TEM), for the FeAl system, show a tendency for the nanoparticles to agglomerate.

摘要

这项工作的目的是评估作为表面活性剂辅助机械合金化制备的永磁体，钕铁硼（硬磁材料）和铁铝（软磁材料）纳米颗粒之间交换耦合的适用性。然后将获得的粉末与85%的钕铁硼体系和15%的铁铝体系混合，并随后在300℃、400℃和500℃下烧结1小时。穆斯堡尔谱（MS）获得的结果显示出具有由六重峰（16k1、16k2、8j1、8j2、4c和4e）表示的六个磁位点的铁磁行为，这是钕铁硼体系的特征。X射线衍射（XRD）结果分别显示钕铁硼和铁铝体系为四方结构和体心立方结构。通过振动样品磁强计（VSM）对在300℃、400℃和500℃下烧结的钕铁硼和铁铝体系混合物获得的结果表明，矫顽场（Hc）随温度和软相百分比急剧下降，与报道的钕铁硼矫顽场值Hc = 6883 Oe相比，在Hc = 132 Oe时。通过透射电子显微镜（TEM）获得的铁铝体系图像显示纳米颗粒有团聚的趋势。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/7a2222fc26c3/molecules-27-07190-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/139a0b486d45/molecules-27-07190-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/4ea8b4898c37/molecules-27-07190-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/5a61dac2f75d/molecules-27-07190-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/6cf21b9d62d4/molecules-27-07190-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/04ee128ed949/molecules-27-07190-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/4c10fefac287/molecules-27-07190-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/4dba013a2568/molecules-27-07190-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/f4030208ddba/molecules-27-07190-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/cce723511cfa/molecules-27-07190-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/45482077c195/molecules-27-07190-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/7a2222fc26c3/molecules-27-07190-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/139a0b486d45/molecules-27-07190-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/4ea8b4898c37/molecules-27-07190-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/5a61dac2f75d/molecules-27-07190-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/6cf21b9d62d4/molecules-27-07190-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/04ee128ed949/molecules-27-07190-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/4c10fefac287/molecules-27-07190-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/4dba013a2568/molecules-27-07190-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/f4030208ddba/molecules-27-07190-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/cce723511cfa/molecules-27-07190-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/45482077c195/molecules-27-07190-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab2f/9656077/7a2222fc26c3/molecules-27-07190-g011.jpg

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