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Title: Recycling of additively printed rare-earth bonded magnets

Abstract

Here, we describe an efficient and environmentally benign method of recycling of additive printed Nd-Fe-B polymer bonded magnets. Rapid pulverization of bonded magnets into composite powder containing Nd-Fe-B particles and polymer binder was achieved by milling at cryogenic temperatures. The recycled bonded magnets fabricated by warm compaction of ground cryomilled coarse composite powders and nylon particles showed improved magnetic properties and density. Remanent magnetization and saturation magnetization increased by 4% and 6.5% respectively, due to enhanced density while coercivity and energy product were retained from the original additive printed bonded magnets. This work presents a facile method that enables the direct reuse of end-of-life bonded magnets for remaking new bonded magnets. In addition to magnetic properties, mechanical properties comparable to commercial products have been achieved. This research advances efforts to ensure sustainability in critical materials by forming close loop supply chain.

Authors:
ORCiD logo [1];  [2];  [1]; ORCiD logo [3]; ORCiD logo [3];  [1]
  1. Ames Lab., Ames, IA (United States)
  2. Iowa State Univ., Ames, IA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A)
OSTI Identifier:
1511946
Alternate Identifier(s):
OSTI ID: 1514993
Report Number(s):
IS-J 9933
Journal ID: ISSN 0956-053X
Grant/Contract Number:  
AC05-00OR22725; DE-AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Waste Management
Additional Journal Information:
Journal Volume: 90; Journal Issue: C; Journal ID: ISSN 0956-053X
Publisher:
International Waste Working Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Recycling; Bonded magnets; Cryomilling; Waste management; Additive manufacturing; Nd-Fe-B

Citation Formats

Gandha, Kinjal, Ouyang, Gaoyuan, Gupta, Shalabh, Kunc, Vlastimil, Parans Paranthaman, M., and Nlebedim, Ikenna C.. Recycling of additively printed rare-earth bonded magnets. United States: N. p., 2019. Web. doi:10.1016/j.wasman.2019.04.040.
Gandha, Kinjal, Ouyang, Gaoyuan, Gupta, Shalabh, Kunc, Vlastimil, Parans Paranthaman, M., & Nlebedim, Ikenna C.. Recycling of additively printed rare-earth bonded magnets. United States. doi:10.1016/j.wasman.2019.04.040.
Gandha, Kinjal, Ouyang, Gaoyuan, Gupta, Shalabh, Kunc, Vlastimil, Parans Paranthaman, M., and Nlebedim, Ikenna C.. Wed . "Recycling of additively printed rare-earth bonded magnets". United States. doi:10.1016/j.wasman.2019.04.040.
@article{osti_1511946,
title = {Recycling of additively printed rare-earth bonded magnets},
author = {Gandha, Kinjal and Ouyang, Gaoyuan and Gupta, Shalabh and Kunc, Vlastimil and Parans Paranthaman, M. and Nlebedim, Ikenna C.},
abstractNote = {Here, we describe an efficient and environmentally benign method of recycling of additive printed Nd-Fe-B polymer bonded magnets. Rapid pulverization of bonded magnets into composite powder containing Nd-Fe-B particles and polymer binder was achieved by milling at cryogenic temperatures. The recycled bonded magnets fabricated by warm compaction of ground cryomilled coarse composite powders and nylon particles showed improved magnetic properties and density. Remanent magnetization and saturation magnetization increased by 4% and 6.5% respectively, due to enhanced density while coercivity and energy product were retained from the original additive printed bonded magnets. This work presents a facile method that enables the direct reuse of end-of-life bonded magnets for remaking new bonded magnets. In addition to magnetic properties, mechanical properties comparable to commercial products have been achieved. This research advances efforts to ensure sustainability in critical materials by forming close loop supply chain.},
doi = {10.1016/j.wasman.2019.04.040},
journal = {Waste Management},
number = C,
volume = 90,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
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This content will become publicly available on April 24, 2020
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