In order to improve the microwave absorbing properties of NdFeB alloys, as-jet milled powders were further processed in a planetary mill. The phase structure, morphology and particle size of the alloy powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and laser diffraction-based particle size analyzer, respectively. The saturation magnetization and electromagnetic parameters of the powders were determined by a vibrating sample magnetometer (VSM) and a vector network ana-lyzer (VNA), respectively. The results showed that the saturation magnetization decreased as the milling time increased. The mini-mum absorption peak frequency shifted towards the lower region and the reflection loss values increased with increasing the ball mill-ing time. The minimum absorption peak value of the powders milled for 15 h on the basis of jet milling reached–44.4 dB at 11.04 GHz, and the bandwidth of R<–10 dB was 1.2 GHz with the best matching thickness of 1.8 mm.
参考文献
| [1] | Yanagimoto K, Majima K, Sunada S. Effect of powder compositions on GHz microwave absorption of EM ab-sorbing sheets. J. Jpn. Soc. Powder Metallurgy, 2004, 51(4):293.,2004. |
| [2] | Wang L, Lin P H, Pan S K, Zhou H Y. Microwave ab-sorbing properties of NdFeCo magnetic powder. J. Rare Earths, 2012, 6:529.,2012. |
| [3] | Zhang S G, Zhu H G, Tian J J. Electromagnetic and mi-crowave absorbing properties of FeCoB powder. Rare Metals, 2013, 32(4):402.,2013. |
| [4] | Kim M S, Min E H, Koh J G. Comparison of the effects of particle shape on thin FeSiCr electromagnetic wave ab-sorber. J. Magn. Magn. Mater., 2009, 321(6):581.,2009. |
| [5] | Zhan J, Yao Y L, Zhang C F, Li C J. Synthesis and mi-crowave absorbing properties of quasione-dimensional mesoporous NiCo2O4 nanostructure. J. Alloys Compd., 2014, 585:240.,2014. |
| [6] | Lü H L, Ji G B, Li X G, Chang X F, Wang M, Zhang H Q, Du Y W. Microwave absorbing properties and enhanced infrared reflectance of FeAl mixture synthesized by two-step ball-milling method. J. Magn. Magn. Mater., 2015, 374:225.,2015. |
| [7] | Zhou T D, Liang D F, Deng L J, Luan D C. Electron struc-ture and microwave absorbing ability of flaky FeSiAl powders. J. Mater. Sci. Technol., 2011, 27(2):170.,2011. |
| [8] | Liao J S, Feng Z K, Qiu J, Tong Y Q. Microwave perme-ability spectra of sputtered Fe-Co-B soft magnetic thin films. Acta Metall. Sin.(Engl. Lett.), 2008, 21(6):419.,2008. |
| [9] | Wang X K, Pan S K, Zhou H Y, Yang T, Lin P H, Yu J. Research on microwave electromagnetic properties ofTb-Fe-Cr alloy. J. Rare Earths, 2011, 29(10):946.,2011. |
| [10] | Wang X, Gong R Z, Li P G, Liu L Y, Cheng W M. Effects of aspect ratio and particle size on the microwave proper-ties of Fe-Cr-Si-Al alloy flakes. Mater. Sci. Eng. A, 2007, 466(1-2):178.,2007. |
| [11] | 付新,韩小磊,杜志伟,冯海波,李岩峰.Microstructural investigation of Nd-rich phase in sintered Nd-Fe-B magnets through electron microscopy[J].稀土学报（英文版）,2013(08):765-771. |
| [12] | SONG Jie,YUE Ming,ZUO Jianhua,ZHANG Zirui,LIU Weiqiang,ZHANG Dongtao,ZHANG Jiuxing.Structure and magnetic properties of bulk nanocrystalline Nd-Fe-B permanent magnets prepared by hot pressing and hot deformation[J].稀土学报（英文版）,2013(07):674-678. |
| [13] | Lian L X, Liu Y, Deng L J. Microstructure and microwave electromagnetic properties of rapidly quenched α-Fe/Nd2Fe14B nanocomposites with low RE content. Rare Metal Mater. Eng., 2013, 2(42):292.,2013. |
| [14] | Zou B F, Zhou T D, Hu J. Effect of amorphous on struc-ture and absorption properties of FeSiCr alloy powders. J. Magn. Magn. Mater., 2013, 335:17.,2013. |
| [15] | Liao S B. Ferromagnetic(Part II). Beijing:Science Press, 1988. 5.,1988. |
| [16] | Michielssen E, Sajer J M, Ranjithan S, Mittra R. Design of lightweight, broad-band microwave absorbers using ge-netic algorithms. IEEE Trans. Microw. Theory Technol., 1993, 41:1024.,1993. |
| [17] | Liu L D, Duan Y P, Ma L X, Liu S H, Yu Z. Microwave absorption properties of a wave-absorbing coating em-ploying carbonyl-iron powder and carbon black. Appl. Surf. Sci., 2010, 257:842.,2010. |
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