Abstract：FeCo nanoparticles were prepared using KBH4 as a reducing agent through chemical reduction method and then annealed at 400-600 ℃. FeCo nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer (VSM). The electromagnetic parameters of FeCo nanoparticles were measured by network vector analyzer (NVA). The microwave absorbing properties of FeCo nanoparticles were analyzed. The effect of annealing temperature on the microwave absorbing properties of FeCo nanoparticles was studied. The results show that the sample prepared under chemical reduction has the maximum reflection loss of -14.9 dB at 2.24 GHz and at the thickness of 5.0 mm, and the main loss mechanism is dielectric loss. With annealing temperature increasing from 400 ℃ to 600 ℃, the dielectric loss decreases and the magnetic loss increases. The sample has the optimal matching performance and the strongest reflection loss after annealed at 400 ℃. The reflection loss of -49.14 dB at 4.48 GHz can be obtained at a thickness of 3.55 mm.
刘艳紫, 苏玉长, 董巧巧, 石聪聪. 退火处理对FeCo纳米粒子吸波性能的影响[J]. 粉末冶金材料科学与工程, 2021, 26(1): 24-31.
LIU Yanzi, SU Yuchang, DONG Qiaoqiao, SHI Congcong. Effect of annealing treatment on microwave absorbing properties of FeCo nanoparticles. Materials Science and Engineering of Powder Metallurgy, 2021, 26(1): 24-31.
[1] SUN X, HE J, LI G, et al.Laminated magnetic graphene with enhanced electromagnetic wave absorption properties[J]. Journal of Materials Chemistry C, 2012, 1(4): 765-777. [2] ZHAO H, HOU L, BI S, et al.Enhanced X-band electromagnetic-interference shielding performance of layer- structured fabric-supported polyaniline/cobalt-nickel coatings[J]. Acs Appl Mater & Interfaces, 2017, 9(38): 33059-33070. [3] HE P, HOU Z L, ZHANG K L, et al.Lightweight ferroferric oxide nanotubes with natural resonance property and design for broadband microwave absorption[J]. Journal of Materials Science, 2017, 52(13): 1-10. [4] ZENG Q, CHEN P, YU Q, et al.Self-assembly of ternary hollow microspheres with strong wideband microwave absorption and controllable microwave absorption properties[J]. Scientific Reports, 2017, 7(1): 8388-8397. [5] LI X, HAN X, TAN Y, et al.Preparation and microwave absorption properties of Ni-B alloy-coated Fe3O4 particles[J]. Journal of Alloys & Compounds, 2008, 464(1/2): 352-356. [6] WANG S, LIANG B, KUANG D, et al.Facile synthesis and excellent microwave absorption properties of FeCo-C core-shell nanoparticles[J]. Nanotechnology, 2018, 29(7): 085604-085625. [7] LIU X G, LI B, GENG D Y, et al.(Fe, Ni)/C nanocapsules for electromagnetic-wave-absorber in the whole Ku-band[J]. Carbon, 2009, 47(2): 470-474. [8] HUANG Y, YAN J, ZHOU S, et al.Preparation and electromagnetic wave absorption properties of CoNi@SiO2 microspheres decorated graphene-polyaniline nanosheets[J]. Journal of Materials Science: Materials in Electronics, 2017, 29(1): 70-79. [9] 王晓磊, 包秀坤, 关银燕, 等. C/Co核壳亚微米复合物的吸波性能[J]. 材料研究学报, 2017, 31(4): 241-247. WANG Xiaolei, BAO Xiukun, GUAN Yinyan, et al.Microwave absorption properties of submicro-composites of core-shell C/Co[J]. Chinese Journal of Materials Research, 2017, 31(4): 241-247. [10] 褚海荣, 陈平, 于祺, 等. FeCo/石墨烯的制备和吸波性能[J]. 材料研究学报, 2018, 32(3): 161-167. CHU Hairong, CHEN Ping, YU Qi, et al.Preparation and microwave absorption properties of FeCo/graphene[J]. Chinese Journal of Materials Research, 2018, 32(3): 161-167. [11] SUNDAR R S, DEEVI S C.Softmagnetic FeCo alloys: Alloy development, processing, and properties[J]. Cheminform, 2010, 50(3): 157-192. [12] KOLHATKAR A G, NEKRASHEVICH I, LITVINOV D, et al.Cubic silica-coated and amine-functionalized FeCo nanoparticles with high saturation magnetization[J]. Chemistry of Materials, 2013, 25(7): 1092-1097. [13] WAECKERLE T, FRAISSE H, CHAPUT L, et al.Low cobalt content electrical sheets for optimized high power density rotating machines[J]. Journal of Magnetism and Magnetic Materials, 2000, 215(1): 207-209. [14] YINYUN L, YITING W, HONGLI L, et al.MOF-derived porous Co/C nanocomposites with excellent electromagnetic wave absorption properties[J]. ACS Applied Materials & Interfaces, 2015, 7(24): 13604-13611. [15] WANG H, YAN Z, AN J, et al.Iron cobalt/polypyrrole nanoplates with tunable broadband electromagnetic wave absorption[J]. RSC Advances, 2016, 6(95): 91252-91258. [16] YAN S J, ZHEN L, XU C Y, et al.Synthesis, characterization and electromagnetic properties of Fe1-xCox alloy flower-like microparticles[J]. Journal of Magnetism & Magnetic Materials, 2011, 323(5): 515-520. [17] YANG Y, XU C, XIA Y, et al.Synthesis and microwave absorption properties of FeCo nanoplates[J]. Journal of Alloys & Compounds, 2010, 493(1/2): 549-552. [18] 樊明德, 袁鹏, 何宏平, 等. 化学液相还原法制备零价铁纳米颗粒研究进展及展望[J]. 化工进展, 2012, 31(7): 1542-1548. FAN Mingde, YUAN Peng, HE Hongping, et al.Review and prospect of zerovalent iron nanoparticles synthesized by chemical solution reduction process[J]. Chemical Industry and Engineering Progress, 2012, 31(7): 1542-1548. [19] DONG X L, ZHANG Z D, JIN S R, et al.Characterization and magnetic properties of Fe-Co ultrafine particles[J]. Journal of Magnetism & Magnetic Materials, 2000, 210(1/3): 143-149. [20] CHAUBEY G S, BARCENA C, POUDYAL N, et al.Synthesis and stabilization of FeCo nanoparticles[J]. Journal of the American Chemical Society, 2007, 129(23): 7214-7215. [21] ABBAS M, ISLAM M N, RAO B P, et al.One-pot synthesis of high magnetization air-stable FeCo nanoparticles by modified polyol method[J]. Materials Letters, 2013, 91(15): 326-329. [22] VAN J, MORUP S, KOCH W, et al.Formation of ultra-fine amorphous alloy particles by reduction in aqueous solution[J]. Nature, 1986, 322: 622-623.
2021, Vol. 26 
