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Enhanced magnetic properties and improved corrosion performance of nanocrystalline Pr-Nd-Y-Fe-B spark plasma sintered magnets

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Journal of Materials Science & Technology 2020年第23期58卷 138-144页

作者： Qingzheng Jiang Jie Song Qingfang Huang Sajjad Ur Rehman Lunke He Qingwen Zeng Zhenchen Zhong Jiangxi Key Laboratory for rare earth Magnetic Materials and Devices&Institute for rare earth Magnetic Materials and Devices(IREMMD) Jiangxi University of Science and TechnologyGanzhou 341000China fujian changting golden dragon rare-earth co.ltd. Longyan 366300China

Recently it is a hot topic to make full use of high abundant Y element in Nd_(2)Fe_(14)B-type permanent *** contrast to Pr and Nd elements,Y shows different metallurgical behaviors during preparation *** 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,*** 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 *** 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 ***(Pr,Nd,Y)-rich phase was found out in SPS-C *** and Nd elements are rich at grain boundary while Y is distributed uniformly at main phase and grain boundary *** strip grains and equiaxed grains exist in SPS-C and SPS-A magnets,*** enhanced magnetic properties for SPS-A magnets are accredited to the uniform distribution of rare-earth-rich phase and low demagnetization *** 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 *** work is also expected to shed light on developing the nanocrystalline Pr-Nd-Y-Fe-B SPSed high-performance magnets in industry.

关键词： Pr-Nd-Y-Fe-B magnets Spark plasma sintering(SPS) Magnetic properties corrosion performance Microstructure and homogeneity

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Uneven Evolution of Microstructure,Magnetic Properties and coercivity Mechanism of Mo-Substituted Nd-Ce-Fe-B Alloys

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Acta Metallurgica Sinica(English Letters) 2021年第4期34卷 590-596页

作者： Li-Li Zhang Jie Song Sajjad Ur Rehman Jia-Jie Li Lei Wang Mu-Nan Yang Ren-Hui Liu Qing-Zheng Jiang Zhen-Chen Zhong Jiangxi Key Laboratory for rare earth Magnetic Materials and Devices/Institute for rare earth Magnetic Materials and Devices Jiangxi University of Science and TechnologyGanzhou341000China fujian changting golden Gragon rare-earth co. LtdChangting366300China

The purpose of this paper is to study the influence of Mo addition on the phase morphologies,microstructures and magnetic properties of the designated *** is found out that the coercivity H_(cj) increases unevenly from 12.2 kOe for(Nd_(0.8)Ce_(0.2))_(13)Fe_(82)B_(5) to the maximum value of 13.3 kOe for(Nd_(0.8)Ce_(0.2))_(13)Fe_(80)B_(5)Mo_(2).The transmission electron microscopy images demonstrate that the grain size decreases with the addition of Mo,which indicates that Mo has grain refinement *** correlative analysis gives rise to the conclusion that the coercivity mechanism of the investigated alloys is dominated by pinning *** in all,the enhancement of the magnetic properties is mainly attributed to the synergistic impact of grain refinement,pinning effects and the micro structural *** research may shed light on the potential development and application of rare earth-based counterpart magnets.

关键词： Mo-doped Nd-Ce-Fe-B alloy Magnetic properties Melt-spun ribbons Microstructure coercivity mechanism

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