为了获得高矫顽力的Sm2Fe17N3磁粉,对平均粒径为2.5 μm的商用Sm2Fe17N3磁粉进行0~60 min高能球磨,研究球磨时间对Sm2Fe17N3磁粉结构与磁性能的影响。结果表明,随球磨时间延长,Sm2Fe17N3粉体的矫顽力先增大后减小,球磨时间为12 min时,Sm2Fe17N3相晶粒尺寸从原始粉末的40.8 nm减小至31.8 nm,粉体具有最高矫顽力,为875.6 kA/m,且磁粉仍保持磁各向异性。球磨时间为30 min时,虽然晶粒尺寸进一步减小,但Sm2Fe17N3分解生成SmN和α-Fe等软磁相,导致磁粉的矫顽力降低,球磨时间为60 min的磁粉矫顽力仅为477.6 kA/m。本研究制备的Sm2Fe17N3粉体可作为高性能Sm2Fe17N3黏结磁体的优质原料粉末。
Sm2Fe17N3 magnetic powders were prepared by high-energy ball milling. The effects of ball milling times on the magnetic properties and microstructure of Sm2Fe17N3 magnetic powders were studied. The results show that the coercivity of Sm2Fe17N3 powders increases first and then decreases with the milling time increases from 0 min to 60 min. When the milling time is 12 min, the grain size of Sm2Fe17N3 phase decreases from 40.8 nm of the original powder to 31.8 nm. The powder has the highest coercivity of 875.6 kA/m, and the magnetic powder still maintains anisotropy. However, when the ball milling time is 30 mins, although the grain size is further reduced, the Sm2Fe17N3 decomposes to form soft magnetic phases such as SmN and α-Fe, resulting in a decrease in the coercivity of the magnet. When the milling time is 60 min, the coercivity of magnetic powders decreases to 477.6 kA/m. This work provides an effective way for the preparation of high-quality Sm2Fe17N3 powder precursors for the preparation of high-performance Sm2Fe17N3 bonded magnets.
[1] COEY J M D. Perspective and prospects for rare earth permanent magnets[J]. Engineering, 2020, 6(2): 119-131.
[2] 朱明刚, 孙旭, 刘荣辉, 等. 稀土功能材料2035发展战略研究[J]. 中国工程科学, 2020, 22(5): 37-43.
ZHU Minggang, SUN Xu, LIU Ronghui, et al.Development strategies for rare earth functional materials by 2035[J]. Strategic Study of CAE, 2020, 6(2): 119-131.
[3] SUN H, COEY J M D, OTANI Y. Magnetic properties of a new series of rare-earth iron nitrides: R2Fe17Ny[J]. Journal of Physics (Condensed Matter), 1990, 2(30): 6465.
[4] COEY J M D, SUN H. Improved magnetic properties by treatment of iron-based rare earth intermetallic compounds in anmonia[J]. Journal of Magnetism and magnetic materials, 1990, 87(3): 251-254.
[5] COEY J M D, STAMENOV P, PORTER S B, et al. Sm-Fe-N revisited; remanence enhancement in melt-spun Nitroquench material[J]. Journal of Magnetism and Magnetic Materials, 2019, 480: 186-192.
[6] 王忠, 刘亚丕, 牛振标, 等. 粘结磁体的研究现状及发展趋势[J]. 材料科学与工艺, 2018, 26(4): 42-51.
WANG Zhong, LIU Yapi, NIU Zhenbiao, et al .The research situation and development tendency of bonded permanent magnets[J]. Materials Science and Technology, 2018, 26(4): 42-51.
[7] TAKAGI K, SODA R, JINNO M, et al.Possibility of high-performance Sm2Fe17N3 sintered magnets by low-oxygen powder metallurgy process[J]. Journal of Magnetism and Magnetic Materials, 2020, 506: 166811.
[8] 卢赐福. Sm2Fe17Nx永磁材料的组织构建及其磁性能研究[D].北京: 北京科技大学, 2019.
LU Cifu.Microstructure design and magnetic properties of Sm2Fe17Nx magnets[D]. Beijing: University of Science and Technology Beijing, 2019.
[9] LIU K, WANG S H, FENG Y L, et al.Phase transformation mechanism and magnetic properties of Sm-Fe alloys produced by melt-spinning and high-energy ball milling[J]. Journal of Magnetism and Magnetic Materials, 2020, 513(1): 167-229.
[10] XU K, LIU Z W, YU H Y, et al.Improved efficiency for preparing hard magnetic Sm2Fe17NX powders by plasma assisted ball milling followed by nitriding[J]. Journal of Magnetism and Magnetic Materials, 2020, 500: 166383.
[11] MATSUDA R, MATSUURA M, TEZUKA N, et al.Preparation of highly geat-Resistant Sm-Fe-N magnetic powder by reduction-dffusion process[J]. Materials Transactions, 2020, 61(11): 2201-2207.
[12] TAKAGI K, JINNO M, OZAKIK. Preparation of TbCu7-type Sm-Fe powders by low-temperature HDDR treatment[J]. Journal of Magnetism and Magnetic Materials, 2018, 454: 170-175.
[13] LYU J, LIDER A, KUDIIAROV V.Using ball milling for modification of the hydrogenation/dehydrogenation process in magnesium-based hydrogen storage materials: an overview[J]. Metals, 2019, 9(7): 768.
[14] RANDRIANANTOANDRO N, COOPER R J, GRENECHE J M, et al.Study of the solid-state ‘amorphization’ reaction in Fe50Re50 by means of Mössbauer spectrometry and diffraction measurements[J]. Journal of Physics: Condensed Matter, 2002, 14(41): 9713.
[15] MISHRA D, PERUMAL A, SRINIVASAN A.Magnetic properties of mechanically alloyed Fe100-xZrx(20≤x≤35) powder[J]. Journal of Physics D: Applied Physics, 2008, 41(21): 215003.
[16] MARTÍNEZ-BLANCO D, GORRIA P, PÉREZ M J, et al. Martensite-austenite transformation in Fe80Ni20 ball-milled powder[J]. Journal of Magnetism and Magnetic Materials, 2007, 316(2): 328-331.
[17] FANG L, ZHANG T, WANG H, et al.Effect of ball milling process on coercivity of nanocrystalline SmCo5 magnets[J]. Journal of Magnetism and Magnetic Materials, 2018, 446: 200-205.
[18] AN X, JIN K, ABBAS N, et al.High anisotropic NdFeB submicro/nanoflakes prepared by surfactant-assisted ball milling at low temperature[J]. Journal of Magnetism and Magnetic Materials, 2017, 442: 279-287.
[19] MA X B, LI L Z, LIU S Q, et al.Anisotropic Sm-Fe-N particles prepared by surfactant-assisted grinding method[J]. Journal of Alloys and Compounds, 2014, 612: 110-113.
[20] YUE M, LI Y Q, LIU R M, et al.Abnormal size-dependent coercivity in ternary Sm-Fe-N nanoparticles[J]. Journal of Alloys and Compounds, 2015, 637: 297-300.
[21] FECHT H J, HELLSTERN E, FU Z, et al.Nanocrystalline metals prepared by high-energy ball milling[J]. Metallurgical Transactions A, 1990, 21(9): 2333-2337.
[22] HEJAZI R F, HUSAIN T, KHAN F I.Landfarming operation of oily sludge in arid region-human health risk assessment[J]. Journal of Hazardous Materials, 2003, 99(3): 287-302.
[23] KOBAYASHI K, SKOMSKI R, COEY J M D. Dependence of coercivity on particle size in Sm2Fe17N3 powders[J]. Journal of Alloys and Compounds, 1995, 222(1/2): 1-7.
[24] LIU R M, YUE M, LIU W Q, et al.Structure and magnetic properties of ternary Tb-Fe-B nanoparticles and nanoflakes[J]. Applied Physics Letters, 2011, 99(16): 162510.
[25] HUANG G, ZHU G, LOU L, et al.Anisotropic bulk Nd2Fe14B/ α-Fe nanohybrid magnets with an enhanced energy product[J]. Materials Letters, 2018, 217: 219-222.
[26] HUANG G, LI X, LOU L, et al.Engineering bulk, layered, multicomponent nanostructures with high energy density[J]. Small, 2018, 14(22): 1800619.
