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Title: Compression Molding and Novel Sintering Treatments for Alnico Type-8 Permanent Magnets in Near-Final Shape with Preferred Orientation

Abstract

We present economic uncertainty in the rare earth (RE) permanent magnet marketplace, as well as in an expanding electric drive vehicle market that favors permanent magnet alternating current synchronous drive motors, motivated renewed research in RE-free permanent magnets like “alnico,” an Al-Ni-Co-Fe alloy. Thus, high-pressure, gas-atomized isotropic type-8H pre-alloyed alnico powder was compression molded with a clean burn-out binder to near-final shape and sintered to density >99% of cast alnico 8 (full density of 7.3 g/cm 3). To produce aligned sintered alnico magnets for improved energy product and magnetic remanence, uniaxial stress was attempted to promote controlled grain growth, avoiding directional solidification that provides alignment in alnico 9. Lastly, successful development of solid-state powder processing may enable anisotropically aligned alnico magnets with enhanced energy density to be mass-produced.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [2];  [2];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Department of Materials Science and Engineering
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1374730
Report Number(s):
IS-J-9368
Journal ID: ISSN 1047-4838; PII: 2453
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 69; Journal Issue: 9; Journal ID: ISSN 1047-4838
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Kassen, Aaron G., White, Emma M. H., Tang, Wei, Hu, Liangfa, Palasyuk, Andriy, Zhou, Lin, and Anderson, Iver E. Compression Molding and Novel Sintering Treatments for Alnico Type-8 Permanent Magnets in Near-Final Shape with Preferred Orientation. United States: N. p., 2017. Web. doi:10.1007/s11837-017-2453-0.
Kassen, Aaron G., White, Emma M. H., Tang, Wei, Hu, Liangfa, Palasyuk, Andriy, Zhou, Lin, & Anderson, Iver E. Compression Molding and Novel Sintering Treatments for Alnico Type-8 Permanent Magnets in Near-Final Shape with Preferred Orientation. United States. doi:10.1007/s11837-017-2453-0.
Kassen, Aaron G., White, Emma M. H., Tang, Wei, Hu, Liangfa, Palasyuk, Andriy, Zhou, Lin, and Anderson, Iver E. Fri . "Compression Molding and Novel Sintering Treatments for Alnico Type-8 Permanent Magnets in Near-Final Shape with Preferred Orientation". United States. doi:10.1007/s11837-017-2453-0. https://www.osti.gov/servlets/purl/1374730.
@article{osti_1374730,
title = {Compression Molding and Novel Sintering Treatments for Alnico Type-8 Permanent Magnets in Near-Final Shape with Preferred Orientation},
author = {Kassen, Aaron G. and White, Emma M. H. and Tang, Wei and Hu, Liangfa and Palasyuk, Andriy and Zhou, Lin and Anderson, Iver E.},
abstractNote = {We present economic uncertainty in the rare earth (RE) permanent magnet marketplace, as well as in an expanding electric drive vehicle market that favors permanent magnet alternating current synchronous drive motors, motivated renewed research in RE-free permanent magnets like “alnico,” an Al-Ni-Co-Fe alloy. Thus, high-pressure, gas-atomized isotropic type-8H pre-alloyed alnico powder was compression molded with a clean burn-out binder to near-final shape and sintered to density >99% of cast alnico 8 (full density of 7.3 g/cm3). To produce aligned sintered alnico magnets for improved energy product and magnetic remanence, uniaxial stress was attempted to promote controlled grain growth, avoiding directional solidification that provides alignment in alnico 9. Lastly, successful development of solid-state powder processing may enable anisotropically aligned alnico magnets with enhanced energy density to be mass-produced.},
doi = {10.1007/s11837-017-2453-0},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
number = 9,
volume = 69,
place = {United States},
year = {2017},
month = {7}
}

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Works referenced in this record:

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