首页|Effects and regulation mechanisms of post-sinter annealing treatment on magnetic properties and microstructures of Nd-Fe-B sintered magnets with varying boron contents

Effects and regulation mechanisms of post-sinter annealing treatment on magnetic properties and microstructures of Nd-Fe-B sintered magnets with varying boron contents

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In traditional Nd-Fe-B-based sintered magnets,the composition,role of each element and microstruc-tures have been extensively investigated globally since they were invented in 1983.However,the effects of boron(B)content and post-sinter annealing(PSA)on the microstructure and magnetic properties have been least studied so far and the relative mechanisms are not yet clear.In this paper,we investigated the influence of B on the magnetic performance and microstructure of Nd-Fe-B sintered magnets origi-nally containing copper(Cu),gallium(Ga)and titanium(Ti).It is shown that the intrinsic coercivity has a substantial increment of 2.86 kOe and the remanence has a slight reduction of 0.16 kGs when B content is reduced from 0.980 wt.％to 0.900 wt.％.Moreover,there is a coercivity increment of 273％and 653％for samples with 0.980 wt.％and 0.900 wt.％B content after PSA,respectively.It is shown that the im-pacts of B content and PSA are significant and their regulation mechanisms are worthwhile to be studied systematically.Furthermore,it is revealed by microstructural analysis that high coercivity of the sample with 0.900 wt.％B after PSA results from the uniform distribution of Ga,Cu,Nd,and the formation of RE6(Fe,M)14(RE=Pr,Nd,M=Cu,Ga)compound in triple junction phases.The dilution of Fe content in grain boundary phases(GB phases)also plays an important role.It is found out that decrease of the re-manence is mainly due to reduction of the matrix phase and c-axis alignment degree.In this study,we explored a new path to develop Nd-Fe-B-based sintered magnets with high comprehensive properties by novel approaches through varying B content,PSA technique and co-adding trace elements.

Magnetic propertyRE6(Fe,M)14 compoundNd-Fe-B sintered magnetsPost-sinter annealingRegulation mechanism

Qingfang Huang、Qingzheng Jiang、Kexiang Zhong、Dakun Chen、Deqin Xu、Dawei Shi、Gang Fu、Junlin Yan、Sajjad Ur Rehman、Qiang Ma、Renhui Liu、Zhenchen Zhong

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Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices & College of Rare Earths,Jiangxi University of Science and Technology,Ganzhou,341000,China

Institute of Rare Earth Magnetic Material,Xiamen Tungsten Co.Ltd,Xiamen,361010,China

Fujian Key Laboratory for Rare Earth Functional Materials,Longyan,366300,China

National Rare Earth Function Materials Innovation Center,Ganzhou,341000,China

Ganjiang Innovation Academy,Chinese Academy of Science,Ganzhou,341000,China

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国家自然科学基金国家自然科学基金Young Talents Program of Jiangxi Provincial Major Discipline Academic and Technical Leaders Training ProgramJiangxi Province Double Thousand Plan江西省自然科学基金Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology国家级大学生创新创业训练计划Technology Program of Fujian ProvinceTechnology Program of Fujian ProvinceSelfdeployed Projects of Ganjiang Innovation Academy,Chinese Academy of Sciences中国科学院重点研究项目

523711885206101520212BCJ23008jxsq202320108520212BAB214018JXUSTQJYX20200032021104070132020H60272021T3063E055B002ZDRW-CN-2021-3

2024

10.1016/j.jmst.2023.08.067

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.181(14)
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