影响SmCo_5@FeCo软磁相包覆效果的关键因素
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摘要
为获得良好磁性耦合和高磁能积的纳米复合永磁粉,系统研究了化学法包覆软磁相FeCo的关键影响因素。研究发现,在制备纳米复合磁粉SmCo_5@FeCo过程中表面活性剂的分子量、反应的加热方式、SmCo_5磁粉的预处理时间以及化学包覆反应的时间等对软磁相的形貌、尺寸、分布,以及对复合粉体的磁性能都有重要影响。表面活性剂分子量的调控和加热方式的改善可使相同量软磁相前躯物投入时形成更致密的高含量包覆层。经过酸洗预处理的SmCo_5粉更有利于软磁相包覆,酸洗时间0.5 h为佳。此结果对制备超高性能纳米复合永磁粉体及块体材料具有重要意义。
In order to get magnetic nanocomposites with good exchange coupling and high magnetic energy product,the key factors during chemical synthesis of soft magnetic phase FeCo coating on hard magnetic phase SmC_o5 were systematically investigated. It was found that the molecular weight of surfactants,the type of heating methods,the pretreatment of hard magnetic SmCo_5 powders by acid pickling had important effects on the morphology,grain size,distribution of soft magnetil plase,and the properties of composite powders. The tuning of molecular weight of surfactants and heating methods could result in more compacted and higher concentrated coating layer. The pretreatment of acid pickling of SmCo_5 was beneficial to the coating of soft magnetic phase layer,and the optimum acid pickling time was 0.5 h. These results are of great significance for the preparation of super high performance permanent magnetic nano-composite powder materials and bulk materials.
In order to get magnetic nanocomposites with good exchange coupling and high magnetic energy product,the key factors during chemical synthesis of soft magnetic phase FeCo coating on hard magnetic phase SmC_o5 were systematically investigated. It was found that the molecular weight of surfactants,the type of heating methods,the pretreatment of hard magnetic SmCo_5 powders by acid pickling had important effects on the morphology,grain size,distribution of soft magnetil plase,and the properties of composite powders. The tuning of molecular weight of surfactants and heating methods could result in more compacted and higher concentrated coating layer. The pretreatment of acid pickling of SmCo_5 was beneficial to the coating of soft magnetic phase layer,and the optimum acid pickling time was 0.5 h. These results are of great significance for the preparation of super high performance permanent magnetic nano-composite powder materials and bulk materials.
引文
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[20]ZENG Yao,HAO Rui,XING Bengang,et al.One-pot synthesis of Fe3O4nanoprisms with controlled electrochemical properties[J].Chem Commun(Camb),2010,46(22):3920-3922.
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[2]宋新昌,周鹰,杨云.稀土永磁材料在国防军工领域的应用[J].舰船电子工程,2015,35(2):26-28.
[3]SKOMSKI R,COEY J M D.Giant energy product in nanostructured two-phase magnets[J].Physical Review B,1993,48(21):15812-15816.
[4]KNELLER E F,HAWIG R.The exchange-spring magnet-a new material principle for permanent-magnets[J].IEEE Transactions on Magnetics,1991,27(4):3588-3600.
[5]COEHOORN R.Novel permanent magnetic materials made by rapid quenching[J].J De Phys,1988,49:669-670.
[6]COEHOORN R,DE MOOIJ D B,DEWAARD C.Meltspun permanent magnet materials containing Fe3B as the main phase[J].Journal of Magnetism and Magnetic Materials,1989,80(1):101-104.
[7]LóPEZ-ORTEGA A,ESTRADER M,SALAZAR-ALVAREZG,et al.Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles[J].Physics Reports,2015,553:1-32.
[8]LIU Fei,ZHU Jinghan,YANG Wenlong,et al.Building nanocomposite magnets by coating a hard magnetic core with a soft magnetic shell[J].Angew Chem Int Ed Engl,2014,53(8):2176-2180.
[9]KIM C W,KIM Y H,LEE D K,et al.A Study of exchange-coupling effect on Nd2Fe14B/α-Fe forming core/shell shape[J].Solid State Phenomena,2007,119:147-150.
[10]NIU Peili,YUE Ming,LI Yongli,et al.Bulk anisotropy Nd-Fe-B/α-Fe nanocomposite permanent magnets prepared by sonochemistry and spark plasma sintering[J].Physica Status Solidi(a),2007,204(12):4009-4012.
[11]YUE Ming,NIU Peili,LI Yongli,et al.Structure and magnetic properties of bulk isotropic and anisotropic Nd2Fe14B∕α-Fe nanocomposite permanent magnets with differentα-Fe contents[J].Journal of Applied Physics,2008,103(7):07E101.
[12]LAMICHANNE M,RAI B K,MISHRA S R,et al.Magnetic properties hard-soft SmCo5-FeNi and SmCo5-FeCo composites prepared by electroless coating technique[J].Open Journal of Composite Materials,2012,2(4):119-124.
[13]LV Lin,WANG Fengqing,ZHENG Qiang,et al.Preparation and magnetic properties of anisotropic SmCo5/Co composite particles[J].Acta Metallurgica Sinica(English Letters),2017,31(2):143-147.
[14]YANG Ce,HOU Yanglong.Advance in the chemical synthesis and magnetic properties of nanostructured rare-earth-based permanent magnets[J].Rare Metals,2013,32(2):105-112.
[15]SEO K,SINHA K,NOVITSKAYA E,et al.Polyvinylpyrrolidone(PVP)effects on iron oxide nanoparticle formation[J].Materials Letters,2018,215:203-206.
[16]LI Jinhui,INUKAI K,TAKAHASHI Y,et al.Effect of PVPon the synthesis of high-dispersion core-shell barium-titanatepolyvinylpyrrolidone nanoparticles[J].Journal of Asian Ceramic Societies,2018,5(2):216-225.
[17]徐杰,甘国友,HTWE N C,et al.PVP平均分子量对纳米银线制备的影响及工艺探究[J].人工晶体学报,2018,47(3):564-569.
[18]LUNA C,MORALES M P,SERNA C J,et al.Effects of surfactants on the particle morphology and self-organization of Co nanocrystals[J].Materials Science and Engineering:C,2003,23(6/7/8):1129-1132.
[19]陈进,韩绍昌,范长岭.聚乙烯吡咯烷酮分子量对LiFePO4/C形貌及电化学性能的影响[J].人工晶体学报,2014,43(10):2528-2533.
[20]ZENG Yao,HAO Rui,XING Bengang,et al.One-pot synthesis of Fe3O4nanoprisms with controlled electrochemical properties[J].Chem Commun(Camb),2010,46(22):3920-3922.
[21]WU Liheng,JUBERT P O,BERMAN D,et al.Monolayer assembly of ferrimagnetic CoxFe3-xO4nanocubes for magnetic recording[J].Nano Letters,2014,14(6):3395-3399.
[22]ZENG Q,ZHANG Y,BONDER M J,et al.Fabrication of SmCo/Co(Fe)composites by electroless Co and Co-Fe plating[J].Journal of Applied Physics,2003,93(10):6498-6500.