Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Substrate Pre-heating on Microstructure and Magnetic Properties of Nd-Fe-B Permanent Magnet Manufactured by L-PBF

L-PBF 공정으로 제조된 Nd-Fe-B계 영구자석의 기판 가열에 따른 미세조직과 자기적 특성 변화

  • Yeon Woo Kim (Korea Institute of Materials Science (KIMS)) ;
  • Haeum Park (Korea Institute of Materials Science (KIMS)) ;
  • Tae-Hoon Kim (Korea Institute of Materials Science (KIMS)) ;
  • Kyung Tae Kim (Korea Institute of Materials Science (KIMS)) ;
  • Ji-Hun Yu (Korea Institute of Materials Science (KIMS)) ;
  • Yoon Suk Choi (Department of Materials Science and Engineering, Pusan National University) ;
  • Jeong Min Park (Korea Institute of Materials Science (KIMS))
  • Received : 2023.03.31
  • Accepted : 2023.04.27
  • Published : 2023.04.28
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Abstract

Because magnets fabricated using Nd-Fe-B exhibit excellent magnetic properties, this novel material is used in various high-tech industries. However, because of the brittleness and low formability of Nd-Fe-B magnets, the design freedom of shapes for improving the performance is limited based on conventional tooling and postprocessing. Laser-powder bed fusion (L-PBF), the most famous additive manufacturing (AM) technique, has recently emerged as a novel process for producing geometrically complex shapes of Nd-Fe-B parts owing to its high precision and good spatial resolution. However, because of the repeated thermal shock applied to the materials during L-PBF, it is difficult to fabricate a dense Nd-Fe-B magnet. In this study, a high-density (>96%) Nd-Fe-B magnet is successfully fabricated by minimizing the thermal residual stress caused by substrate heating during L-PBF.

Keywords

Acknowledgement

This work was supported by Basic Research Program (Development of Magnetic Powders Specialized for 3D Printing for Next-generation High-efficiency Motors) of Korea Institute of Machinery and Materials (KIMM). This work was also supported by National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (grant number: 2021M3D1A2047724).

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