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| 1 | 烧结NdFeB永磁体的腐蚀性研究现状显示文摘综述了在不同因素影响下的烧结钕铁硼永磁体的腐蚀行为,影响因素包括:环境温度、湿度、气体组成、水溶液pH值,以及磁体磁化状态、密度及富钕相分布、成分组成等。提高磁体密度,使富钕相均匀分布以及添加合金元素,都可以有效提高磁体的抗腐蚀性。 | 孔祥薇 刘国征 赵明静 赵瑞金 鲁富强 武斌 | 2013 | 稀土2013，34，6： | 15 |
| 2 | 镝扩渗对烧结钕铁硼磁体组织结构与磁性能的影响显示文摘对比研究了38UH、42SH和N50薄片状钕铁硼磁体晶界镝扩渗前后的组织结构与磁性能,发现经过镝扩渗处理后磁体的矫顽力提高了400kA·m^(-1)以上,而剩磁几乎不变,最大磁能积因为矫顽力和方形度的提高而提高.经组织结构分析认为,钕铁硼磁体晶界镝扩渗提高矫顽力主要是通过提高Nd_2Fe_(14)B晶粒外延层的各向异性和形核场实现的.根据Fick第一扩散定律,对磁体晶界镝扩渗进行了模拟计算,可近似得到定温热处理不同时间后渗镝深度及对应的镝的质量浓度及质量分数. | 包小倩 毛华云 高学绪 | 2014 | 北京科技大学学报2014，36，9： | 12 |
| 3 | 烧结NdFeB永磁材料腐蚀与防护的研究现状及挑战显示文摘烧结NdFeB永磁材料的腐蚀敏感性限制了其在复杂工况下的应用,提高磁体的抗腐蚀能力和开发优异的防护涂层是领域发展的重点方向。尽管针对长寿命NdFeB磁体的探索已经做了大量工作,但是从技术工艺到基础理论,系统地研究NdFeB磁体的腐蚀问题仍然比较少,这一方面是由于材料腐蚀与防护的基础研究滞后于磁性能方面的研究工作,另一方面还与市场对材料品质要求的不断提高及多样化需求有较大关系。本文综述了耐蚀烧结NdFeB永磁材料的最新研究成果,包括影响腐蚀的因素、提高磁体耐蚀性能的基础理论及方法、表面防护战略的基本框架及工程应用中的关键技术;最后,展望了未来前景并分析了面临的挑战,期望为今后的发展指明方向。 | 吴玉程 高志强 徐光青 刘家琴 轩海成 刘友好 衣晓飞 陈静武 韩培德 | 2021 | 金属学报2021，57，2： | 5 |
| 4 | Enhancement of corrosion resistance in sintered Nd-Fe-B permanent magnet doping with different CuZn5 contents显示文摘Nd-Fe-B permanent magnets doped with CuZn_5 powders were prepared via conventional sintered method. The effects of CuZn_5 contents on magnetic properties and corrosion resistance of the magnets were systematically studied. It shows that the remanence,coercivity, and maximum energy product decrease gradually with the increase in CuZn_5 doping content. The magnet's corrosion kinetics in autoclaves environment and its electrochemical properties in electrolytes were also examined. It is interesting to see that the weight loss of3.5 wt% and 4.5 wt% CuZn5 powders doping magnets is only 1 and 0 mg·cm^(-2) after autoclaves test at 121℃,2 ×10~5 Pa for 500 h, respectively, which is much lower than that of the magnets without CuZn_5 doping. Electrochemical results show that the CuZn_5 powders doping magnets display more positive corrosion potential(E_(corr))and lower corrosion current density(I_(corr)) than those of the original magnets without CuZn_5 doping in sulphuric acid electrolyte and distilled water. It is, therefore, concluded that doping CuZn_5 powders is a promising way to enhance the corrosion resistance of sintered Nd-Fe-B magnets. | Zhuang Wang Wei-Qiang Liu Dong-Tao Zhang Ming Yue Xiu-Lian Huang Xu-Liang Li | 2017 | Rare Metals2017，36，10： | 5 |
| 5 | 烧结NdFeB磁体晶界扩散Tb_(70)Cu_(30)合金的热稳定性及微观结构研究显示文摘采用涂敷的方式,在烧结NdFeB磁体晶界扩散Tb_(70)Cu_(30)合金,研究磁体扩散前后磁性能及微观结构变化,并分析了磁体矫顽力及热稳定性的提升的机制。研究表明,扩散磁体经过810℃×6 h+490℃×3 h工艺处理后性能达到最优,矫顽力从17.37 kOe提升到20.04 kOe,剩磁和最大磁能积基本不下降。扩散磁体的矫顽力温度系数|β|由0.454%·℃^(-1)降为0.442%·℃^(-1),不可逆磁通损失低于原始磁体,表明扩散Tb_(70)Cu_(30)提高了烧结NdFeB磁体的热稳定性。微观结构分析得出,晶界扩散矫顽力提升的机制是形成高各向异性场的(Nd,Tb)_(2)Fe_(14)B核壳结构和连续分布富钕相,增加去磁耦合作用,使扩散磁体的矫顽力及热稳定性提高。 | 周头军 潘为茂 刘仁辉 屈鹏鹏 黎绵付 钟震晨 | 2021 | 中国稀土学报2021，39，6： | 3 |
| 6 | Enhanced magnetic properties and improved corrosion performance of nanocrystalline Pr-Nd-Y-Fe-B spark plasma sintered magnets显示文摘Recently it is a hot topic to make full use of high abundant Y element in Nd_(2)Fe_(14)B-type permanent magnets.In contrast to Pr and Nd elements,Y shows different metallurgical behaviors during preparation process.In this paper,we have explored the magnetic properties,microstructures and corrosion performance of Pr-Nd-Y-Fe-B magnets fabricated by spark plasma sintering(SPS)technique from the ribbons of nanocrystalline and amorphous precursors,respectively.The coercivity and maximum energy product were improved for the magnets prepared from amorphous precursor materials(denoted as SPS-A hereafter)compared with the magnets prepared from crystalline precursor materials(denoted as SPS-C hereafter).Magnetic properties of Jr=0.79 T,Hci=864 k A/m,and(BH)_(max)=102 k J/m^(3)were obtained for SPS-A magnets.In contrast with SPS-C magnets,the magnetic properties of SPS-A magnets are not so sensitive to the preparation conditions,which is quite beneficial to the homogeneity of microstructure and enhancement of coercivity for large-scale production of the designated magnets.Aggregated(Pr,Nd,Y)-rich phase was found out in SPS-C magnets.Pr and Nd elements are rich at grain boundary while Y is distributed uniformly at main phase and grain boundary phase.The strip grains and equiaxed grains exist in SPS-C and SPS-A magnets,respectively.The enhanced magnetic properties for SPS-A magnets are accredited to the uniform distribution of rare-earth-rich phase and low demagnetization factor.It is revealed by electrochemical test and dipping test that the corrosion potential is more positive and the corrosion rate is slower for the SPS-A magnets in 3.5 wt.%Na Cl solution.The work is also expected to shed light on developing the nanocrystalline Pr-Nd-Y-Fe-B SPSed high-performance magnets in industry. | Qingzheng Jiang Jie Song Qingfang Huang Sajjad Ur Rehman Lunke He Qingwen Zeng Zhenchen Zhong | 2020 | Journal of Materials Science & Technology2020，58，23： | 1 |
| 7 | 非稀土金属及合金化合物改性烧结NdFeB磁体的研究进展显示文摘研究发现,烧结钕铁硼(NdFeB)磁体的矫顽力(H_C)、腐蚀性与晶界相成分、微观结构息息相关.传统熔炼添加重稀土元素虽可改善晶界相提高磁体的H_C及抗蚀性,但同时也使添加物均匀地分布于主相,引起稀磁效应并使成本增加.通过晶界添加非稀土物质调控磁体晶界相,可优化晶界相微观结构,提高其电极电位及润湿性,从而在磁体H_C和耐蚀性得以改善的同时,降低磁体中重稀土元素的用量及成本.对近些年晶界添加非稀土金属及合金化合物调控烧结NdFeB晶界相成分、微观结构及其对磁体H_C、抗蚀性影响的部分研究进行了归纳. | 吕蒙 孔拓 朱明原 胡业旻 金红明 李文献 李瑛 | 2017 | 上海师范大学学报(自然科学版)2017，46，6： | 0 |
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