Effects of Dy diffusion time on magnetic properties of Nd–Fe–B sintered magnets
In recent years, significant research efforts were undertaken to enhance coercivity ( H _cj ) of Nd-Fe-B sintered magnets. One of the methods is Dy diffusion, which is very effective in improving H _cj while maintaining the same level of remanence ( B _r ). Experiments reported in this work revealed...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ab64d3 |
| _version_ | 1797747036435513344 |
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| author | Xiao-Ming Song Ting-An Zhang Zhi-He Dou Wen-Li Pei Lian Zhou |
| author_facet | Xiao-Ming Song Ting-An Zhang Zhi-He Dou Wen-Li Pei Lian Zhou |
| author_sort | Xiao-Ming Song |
| collection | DOAJ |
| description | In recent years, significant research efforts were undertaken to enhance coercivity ( H _cj ) of Nd-Fe-B sintered magnets. One of the methods is Dy diffusion, which is very effective in improving H _cj while maintaining the same level of remanence ( B _r ). Experiments reported in this work revealed that Dy diffusion differently affected H _cj of Nd-Fe-B sintered magnets at three diffusion stages: (1) from 0 to 4 h of Dy diffusion, H _cj increased rapidly from 32.3 to 36.5 kOe as Dy content increased rapidly from 0 to 0.27 wt%; (2) from 4 to 24 h, when Dy content changed from 0.27 to 0.56wt%, H _cj increased from 36.5 to 38.7 kOe; (3) from 24 to 30 h, H _cj and Dy content barely changed. Thus, extending Dy diffusion time beyond 24 h period would not yield any improvements. From 0 to 30 h, B _r slightly decreased from 12.40 to 12.22 kGs. During Dy diffusion, intergranular grain boundaries became continuous and homogeneous, and some micro-defects were repaired. As a result, from 0 to 24 h, H _cj enhanced significantly while B _r barely changed. Thus, the Nd-Fe-B sintered magnets with high properties ( B _r = 12.22 kGs, H _cj = 38.9 kOe and ( BH ) _max = 36.87 MGOe) were obtained. |
| first_indexed | 2024-03-12T15:46:20Z |
| format | Article |
| id | doaj.art-bab2d60b2d554a18a25589b867e235f6 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:46:20Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-bab2d60b2d554a18a25589b867e235f62023-08-09T15:27:11ZengIOP PublishingMaterials Research Express2053-15912020-01-017101611010.1088/2053-1591/ab64d3Effects of Dy diffusion time on magnetic properties of Nd–Fe–B sintered magnetsXiao-Ming Song0https://orcid.org/0000-0001-6277-785XTing-An Zhang1Zhi-He Dou2Wen-Li Pei3Lian Zhou4School of Materials Science and Engineering, Northeastern University , Shenyang 110006, People’s Republic of China; Ningbo Qiyuan New Materials Technology Co., Ltd, Ningbo 315040, People’s Republic of ChinaSchool of Metallurgy, Northeastern University , Shenyang 110006, People’s Republic of ChinaSchool of Metallurgy, Northeastern University , Shenyang 110006, People’s Republic of ChinaSchool of Materials Science and Engineering, Northeastern University , Shenyang 110006, People’s Republic of ChinaSchool of Materials Science and Engineering, Northeastern University , Shenyang 110006, People’s Republic of ChinaIn recent years, significant research efforts were undertaken to enhance coercivity ( H _cj ) of Nd-Fe-B sintered magnets. One of the methods is Dy diffusion, which is very effective in improving H _cj while maintaining the same level of remanence ( B _r ). Experiments reported in this work revealed that Dy diffusion differently affected H _cj of Nd-Fe-B sintered magnets at three diffusion stages: (1) from 0 to 4 h of Dy diffusion, H _cj increased rapidly from 32.3 to 36.5 kOe as Dy content increased rapidly from 0 to 0.27 wt%; (2) from 4 to 24 h, when Dy content changed from 0.27 to 0.56wt%, H _cj increased from 36.5 to 38.7 kOe; (3) from 24 to 30 h, H _cj and Dy content barely changed. Thus, extending Dy diffusion time beyond 24 h period would not yield any improvements. From 0 to 30 h, B _r slightly decreased from 12.40 to 12.22 kGs. During Dy diffusion, intergranular grain boundaries became continuous and homogeneous, and some micro-defects were repaired. As a result, from 0 to 24 h, H _cj enhanced significantly while B _r barely changed. Thus, the Nd-Fe-B sintered magnets with high properties ( B _r = 12.22 kGs, H _cj = 38.9 kOe and ( BH ) _max = 36.87 MGOe) were obtained.https://doi.org/10.1088/2053-1591/ab64d3Sintered magnetsNd-Fe-BMagnetic propertiesDy diffusion |
| spellingShingle | Xiao-Ming Song Ting-An Zhang Zhi-He Dou Wen-Li Pei Lian Zhou Effects of Dy diffusion time on magnetic properties of Nd–Fe–B sintered magnets Materials Research Express Sintered magnets Nd-Fe-B Magnetic properties Dy diffusion |
| title | Effects of Dy diffusion time on magnetic properties of Nd–Fe–B sintered magnets |
| title_full | Effects of Dy diffusion time on magnetic properties of Nd–Fe–B sintered magnets |
| title_fullStr | Effects of Dy diffusion time on magnetic properties of Nd–Fe–B sintered magnets |
| title_full_unstemmed | Effects of Dy diffusion time on magnetic properties of Nd–Fe–B sintered magnets |
| title_short | Effects of Dy diffusion time on magnetic properties of Nd–Fe–B sintered magnets |
| title_sort | effects of dy diffusion time on magnetic properties of nd fe b sintered magnets |
| topic | Sintered magnets Nd-Fe-B Magnetic properties Dy diffusion |
| url | https://doi.org/10.1088/2053-1591/ab64d3 |
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