Strategy for co-enhancement of interface adhesion and coercivity of Nd-Fe-B grain boundary diffusion magnet: TbH3 nanopowders used in screen printing - Details

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Abstract：

Screen　printing　technology　(SPT)　was　applied　to　conduct　grain　boundary　diffusion　sintered　Nd-Fe-B　magnets　using　TbH3　and　TbF3　nanopowders　as　diffusion　sources.　TbH3　grain　boundary　diffusion　(HGBD)　coating　had　better　adhesion　to　the　magnet　surface　than　TbF3　grain　boundary　diffusion　(FGBD)　coating.　When　the　weight　gain　ratio　was　1.0　wt%,　the　HGBD　magnet　achieved　a　coercivity　increment　of　11.07　kOe　under　non-pressurized　heat　treatment,　while　effectively　controlling　the　magnet＇s　residual　C　and　O　elements.　However,　pressure　heat　treatment　was　necessary　for　the　FGBD　magnet　to　improve　the　coercivity　due　to　the　poor　adhesion　between　the　coating　and　the　magnet　surface,　resulting　in　more　residual　C　and　O　elements　inside　the　magnet.　Moreover,　the　coercivity　of　the　FGBD　magnet　only　increased　by　7.96　kOe.　Compared　to　the　FGBD　magnet,　Tb　diffused　deeper　into　the　HGBD　magnet　and　formed　more　(Nd,　Tb)2Fe14B-Nd2Fe14B　core–shell　structures.　The　formation　of　core–shell　structures　greatly　enhanced　the　nucleation　field　of　the　reverse　domain,　thereby　increasing　the　coercivity.　Hence,　the　HGBD　magnet　had　a　higher　coercivity　increment.　In　addition,　the　HGBD　magnet　possessed　better　coercivity　temperature　stability　than　the　original　and　FGBD　magnets.　Using　TbH3　nanopowders　as　a　diffusion　source　for　SPT　can　achieve　higher　magnetic　properties　and　simplified　processes　without　pressure.　©　2024　Elsevier　B.V.

Keyword：

Sintered Nd-Fe-B magnets Screen printing technology Grain boundary diffusion Coercivity temperature stability TbH3 nanopowders

Author Community：

[ 1 ] [Wu H.]College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing, 100124, China
[ 2 ] [Wang Z.]College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing, 100124, China
[ 3 ] [Liu W.]College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing, 100124, China
[ 4 ] [Fan M.]Independent Researcher, San Jose, 95131, CA, United States
[ 5 ] [Li Y.]College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing, 100124, China
[ 6 ] [Ji M.]College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing, 100124, China
[ 7 ] [Du R.]College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing, 100124, China
[ 8 ] [Zhang D.]College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing, 100124, China
[ 9 ] [Xiang G.]College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing, 100124, China
[ 10 ] [Yue M.]College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing, 100124, China
[ 11 ] [Yi X.]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei, 231500, China
[ 12 ] [Yi X.]Earth-Panda Advance Magnetic Material Co., Ltd., Hefei, 231500, China
[ 13 ] [Liu Y.]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei, 231500, China
[ 14 ] [Liu Y.]Earth-Panda Advance Magnetic Material Co., Ltd., Hefei, 231500, China
[ 15 ] [Zha S.]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei, 231500, China
[ 16 ] [Zha S.]Earth-Panda Advance Magnetic Material Co., Ltd., Hefei, 231500, China

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Source ：

Journal of Magnetism and Magnetic Materials

ISSN： 0304-8853

Year： 2024

Volume： 610

2 . 7 0 0

JCR@2022

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SCOPUS Cited Count： 1

ESI Highly Cited Papers on the List： 0 Unfold All

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Chinese Cited Count：

30 Days PV： 8

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