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

作　　者：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 

机构地区：[1]Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices&College of Rare Earths,Jiangxi University of Science and Technology,Ganzhou,341000,China [2]Institute of Rare Earth Magnetic Material,Xiamen Tungsten Co.Ltd,Xiamen,361010,China [3]Fujian Key Laboratory for Rare Earth Functional Materials,Longyan,366300,China [4]Ganjiang Innovation Academy,Chinese Academy of Science,Ganzhou,341000,China [5]National Rare Earth Function Materials Innovation Center,Ganzhou,341000,China

出　　处：《Journal of Materials Science & Technology》2024年第14期63-70,共8页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52371188,52061015);Young Talents Program of Jiangxi Provincial Major Discipline Academic and Technical Leaders Training Program(No.20212BCJ23008);Jiangxi Provincial Natural Science Foundation(No.20212BAB214018);the Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology(No.JXUSTQJYX2020003);National College Students Innovation and Entrepreneurship Training Program(No.202110407013);Technology Program of Fujian Province(Nos.2020H6027,2021T3063);Self-deployed Projects of Ganjiang Innovation Academy,Chinese Academy of Sciences(No.E055B002);the Key Research Program of the Chinese Academy of Sciences(No.ZDRW-CN-2021–3).

摘　　要：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 27.3%and 65.3%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 RE 6(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.

关 键 词：Magnetic property RE_(6)(Fe M)_(14) compound Nd-Fe-B sintered magnets Post-sinter annealing Regulation mechanism 

分 类 号：TM273[一般工业技术—材料科学与工程]