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材料导报  2020, Vol. 34 Issue (8): 8025-8030    https://doi.org/10.11896/cldb.19090215
  无机非金属及其复合材料 |
氮添加量对块体纳米晶NdFeB永磁材料的影响
梁惠东, 郑汉杰, 杨浩, 王晨, 陈俊锋, 汪炳叔
福州大学材料科学与工程学院,福州 350108
Effects of Nitrogen Addition on Bulk Nanocrystalline NdFeB Permanent Magnets
LIANG Huidong, ZHENG Hanjie, YANG Hao, WANG Chen, CHEN Junfeng, WANG Bingshu
College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China
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摘要 通过铜模吸铸法制备Φ2 mm的棒状Nd8.5Fe65.5Ti2ZrNbB22-xNx(x=0~2,原子分数,%)合金,研究了氮添加量对样品微结构、室温和高温磁性能、耐腐蚀性能的影响。结果表明,添加氮元素可以细化晶粒,抑制Nd19Fe68B68相的生成,促进Nd2Fe14B永磁相的生成,显著提高样品的磁性能、温度稳定性和耐腐蚀性能。当x=1时,样品的室温磁性能、高温磁性能和耐腐蚀性能均达到最佳。与x=0的样品相比,x=1的样品的室温内禀矫顽力iHc、剩磁Br和最大磁能积(BH)max分别提高了70.6%、14.6%和100.0%;25~180 ℃温度范围内的剩磁温度系数α和矫顽力温度系数β的绝对值分别降低了36.1%和19.7%;25~250 ℃温度范围内的磁通不可逆损失Hirr从-30.8%/K提高到-19.6%/K;自腐蚀电位Ecorr从-0.979 V升高到-0.784 V,自腐蚀电流Icorr从1.054×10-4 A/cm2下降到1.736×10-5 A/cm2。
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梁惠东
郑汉杰
杨浩
王晨
陈俊锋
汪炳叔
关键词:  永磁材料  NdFeB  铜模吸铸法  磁性能  耐腐蚀性能    
Abstract: The bulk nanocrystalline magnets of Nd8.5Fe65.5Ti2ZrNbB22-xNx(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 iHc, the remanence Br 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 Ecorr increases from -0.979 V to -0.784 V, and the corrosion current density Icorr 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
                    发布日期:  2020-04-25
ZTFLH:  TM273  
基金资助: 福建省自然科学基金项目(2017J01477);福建省高校产学合作项目(2017H6016);上杭县奇迈科技创新基金项目(2017SQM04); 国家自然科学基金(51871057)
通讯作者:  msewang@fzu.edu.cn   
作者简介:  梁惠东,2017年6月毕业于江西理工大学材料科学与工程学院,获得工学学士学位。现为福州大学材料科学与工程学院硕士研究生,在王晨教授的指导下进行研究。目前主要研究领域为稀土永磁材料。
王晨,福州大学教授,2006年毕业于浙江大学,获材料科学与工程专业博士学位。同年进入福州大学工作至今,主要研究方向包括:稀土永磁材料和高强高导铜合金材料。在国内外学术期刊上发表文章50多篇,授权发明专利10项。
引用本文:    
梁惠东, 郑汉杰, 杨浩, 王晨, 陈俊锋, 汪炳叔. 氮添加量对块体纳米晶NdFeB永磁材料的影响[J]. 材料导报, 2020, 34(8): 8025-8030.
LIANG Huidong, ZHENG Hanjie, YANG Hao, WANG Chen, CHEN Junfeng, WANG Bingshu. Effects of Nitrogen Addition on Bulk Nanocrystalline NdFeB Permanent Magnets. Materials Reports, 2020, 34(8): 8025-8030.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.19090215  或          http://www.mater-rep.com/CN/Y2020/V34/I8/8025
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