Coercivity enhancement of selective laser sintered NdFeB magnets by grain boundary infiltration

Christian Huber; Hossein Sepehri-Amin; Michael Goertler; Martin Groenefeld; Iulian Teliban; Kazuhiro Hono; Dieter Suess

Coercivity enhancement of selective laser sintered NdFeB magnets by grain boundary infiltration

Applied Physics 2019-03-07 v1

Authors: Christian Huber , Hossein Sepehri-Amin , Michael Goertler , Martin Groenefeld , Iulian Teliban , Kazuhiro Hono , Dieter Suess

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Abstract

Laser powder bed fusion is a well-established additive manufacturing method that can be used for the production of net-shaped Nd-Fe-B sintered magnets. However, low coercivity has been one of the drawbacks in the laser powder bed fusion processed Nd-Fe-B magnets. In this work, we have demonstrated that the grain boundary diffusion process using low-melting Nd-Cu, Nd-Al-Ni-Cu, and Nd-Tb-Cu alloys to the selective laser sintered NdFeB magnets can results in a substantial enhancement of coercivity from 0.65 T to 1.5 T. Detailed microstructure investigations clarified formation of Nd-rich grain boundary phase, introducing Tb-rich shell at the surface of Nd2Fe14B grains, and maintaining the grain size in nano-scale are responsible for the large coercivity enhancement.

Keywords

ndfeb magnets selective laser sintering coercivity enhancement grain boundary diffusion additive manufacturing microstructure

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@article{arxiv.1903.02233,
  title  = {Coercivity enhancement of selective laser sintered NdFeB magnets by grain boundary infiltration},
  author = {Christian Huber and Hossein Sepehri-Amin and Michael Goertler and Martin Groenefeld and Iulian Teliban and Kazuhiro Hono and Dieter Suess},
  journal= {arXiv preprint arXiv:1903.02233},
  year   = {2019}
}

Coercivity enhancement of selective laser sintered NdFeB magnets by grain boundary infiltration

Abstract

Keywords

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