氮添加量对块体纳米晶NdFeB永磁材料的影响

doi:10.11896/cldb.19090215

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Abstract The bulk nanocrystalline magnets of Nd_8.5Fe_65.5Ti₂ZrNbB_22-xN_x(x=0—2, at%) in the rod form with 2 mm diameter were prepared by copper mold suction casting. The effects of nitrogen addition on the microstructure, room-temperature and high-temperature magnetic properties, and corrosion resistance of the samples were studied. It is shown that the N addition can refine the grains, inhibit the formation of Nd₁₉Fe₆₈B₆₈ phase, and promote the formation of Nd₂Fe₁₄B permanent magnetic phase. Thus, the magnetic properties, thermal stability and corrosion resis-tance of the samples are significantly improved. The sample with x=1 exhibited the best room-temperature and high-temperature magnetic properties, and the best corrosion resistance. As compared to the sample with x=0, the intrinsic coercivity _iH_c, the remanence B_r and the maximum energy product (BH)_max of the sample with x=1 at room temperature increased by 70.6%, 14.6% and 100.0%, respectively. At the same time, in the temperature range of 25—180 ℃, the absolute values of the temperature coefficients α and β for the remanence and coercivity decrease by 36.1% and 19.7%, respectively. The flux irreversible loss in the temperature range of 25—250 ℃ increases from -30.8%/K for the sample with x=0 to -19.6%/K for the sample with x=1. Furthermore, as x increases from 0 to 1, the corrosion potential E_corr increases from -0.979 V to -0.784 V, and the corrosion current density I_corr decreases from 1.054×10^-4 A/cm² to 1.736×10^-5 A/cm².

Key words： permanent magnets NdFeB copper mold suction casting magnetic property corrosion resistance

Published: 25 April 2020

CLC number:

TM273

Fund:This work was financially supported by the Natural Science Foundation of Fujian Province (2017J01477), the Joint Research Fund for Industry and University of Fujian Province (2017H6016), the Qimai Science and Technology Innovation Foundation of Shanghang County (2017SQM04), the National Natural Science Foundation of China (51871057).

About author:: Huidong Liangreceived his bachelor’s degree in College of Materials Science and Engineering at Jiangxi University of Science and Technology in June 2017. He is currently pursuing his master’s degree at School of Materials Science and Engineering, Fuzhou University under the supervision of Prof. Chen Wang. His research has focused on rare-earth permanent magnets.
Chen Wang, professor of Fuzhou University, obtained his Ph.D. degree in materials science and engineering from Zhejiang University in 2006. His research interests are rare-earth permanent magnets, high strength and high conductivity copper alloys. He has published more than 50 papers in domestic and international journal, and obtained 10 national invention patents.

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	LIANG Huidong
	ZHENG Hanjie
	YANG Hao
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	CHEN Junfeng
	WANG Bingshu

Cite this article:

LIANG Huidong,ZHENG Hanjie,YANG Hao, et al. Effects of Nitrogen Addition on Bulk Nanocrystalline NdFeB Permanent Magnets[J]. Materials Reports, 2020, 34(8): 8025-8030.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19090215 OR http://www.mater-rep.com/EN/Y2020/V34/I8/8025

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