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Title: A superconducting solenoid and press for permanent magnet fabrication.

Abstract

For the first time, a superconducting solenoid (SCM) was used to increase the remnant magnetization of sintered NdFeB permanent magnets (PMs). In particular, improved magnetic alignment of commercial-grade PM powder was achieved, as it was axial die pressed into 12.7-mm diameter cylindrical compacts in the 76.2-mm warm bore of a 9-T SCM. The press used to compact the powder is unique and was specifically designed for use with the SCM. Although the press was operated in the batch mode for this proof of concept study, its design is intended to enable automated production. In operation, a simple die and punch set made of nonmagnetic materials was filled with powder and loaded into a nonmagnetic press tube. The cantilevered press tube was inserted horizontally, on a carrier manually advanced along a track, into the SCM. The robustness of the mechanical components and the SCM, in its liquid helium dewar, were specifically designed to allow for insertion and extraction of the magnetic powder and compacts, while operating at 9 T. Compaction was achieved by pressing the punches between the closed end of the press tube and the hydraulic cylinder mounted on the opposite end. Improvements up to 10% in magnetization and 20%more » in energy products of the permanent magnets were obtained, as the alignment fields were increased above the 2-T maximum field of the electromagnets used in industry. Increases in magnetization of 3% are significant in the mature sintered magnet industry.« less

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
799824
Report Number(s):
ANL/ET/CP-106795
Journal ID: ISSN 1051--8223; TRN: US200224%%98
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Conference
Resource Relation:
Journal Volume: 13; Journal Issue: 2; Conference: Applied Superconductivity Conference and Expo (ASC 2002), Houston, TX (US), 08/04/2002--08/09/2002; Other Information: PBD: 16 Jul 2002
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ALIGNMENT; DESIGN; ELECTROMAGNETS; FABRICATION; PERMANENT MAGNETS; PRESSING; SOLENOIDS; SUPERCONDUCTING DEVICES; PRESSES; NEODYMIUM BORIDES; IRON BORIDES

Citation Formats

Mulcahy, T M, and Hull, J R. A superconducting solenoid and press for permanent magnet fabrication.. United States: N. p., 2002. Web. doi:10.1109/TASC.2003.812859.
Mulcahy, T M, & Hull, J R. A superconducting solenoid and press for permanent magnet fabrication.. United States. doi:10.1109/TASC.2003.812859.
Mulcahy, T M, and Hull, J R. Tue . "A superconducting solenoid and press for permanent magnet fabrication.". United States. doi:10.1109/TASC.2003.812859. https://www.osti.gov/servlets/purl/799824.
@article{osti_799824,
title = {A superconducting solenoid and press for permanent magnet fabrication.},
author = {Mulcahy, T M and Hull, J R},
abstractNote = {For the first time, a superconducting solenoid (SCM) was used to increase the remnant magnetization of sintered NdFeB permanent magnets (PMs). In particular, improved magnetic alignment of commercial-grade PM powder was achieved, as it was axial die pressed into 12.7-mm diameter cylindrical compacts in the 76.2-mm warm bore of a 9-T SCM. The press used to compact the powder is unique and was specifically designed for use with the SCM. Although the press was operated in the batch mode for this proof of concept study, its design is intended to enable automated production. In operation, a simple die and punch set made of nonmagnetic materials was filled with powder and loaded into a nonmagnetic press tube. The cantilevered press tube was inserted horizontally, on a carrier manually advanced along a track, into the SCM. The robustness of the mechanical components and the SCM, in its liquid helium dewar, were specifically designed to allow for insertion and extraction of the magnetic powder and compacts, while operating at 9 T. Compaction was achieved by pressing the punches between the closed end of the press tube and the hydraulic cylinder mounted on the opposite end. Improvements up to 10% in magnetization and 20% in energy products of the permanent magnets were obtained, as the alignment fields were increased above the 2-T maximum field of the electromagnets used in industry. Increases in magnetization of 3% are significant in the mature sintered magnet industry.},
doi = {10.1109/TASC.2003.812859},
journal = {},
issn = {1051--8223},
number = 2,
volume = 13,
place = {United States},
year = {2002},
month = {7}
}

Conference:
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