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Title: Investigation of Powder Processing, Heat Treating, and Texturing to Improve Gas Atomized alnico Magnets for use in Electric Drive Motors

Abstract

Alnico permanent magnet materials have been proposed as a rare earth free permanent magnet alternative during an ongoing search to replace rare earth permanent magnets that are used for interior permanent magnet motors, a common motor found in electric vehicles. A powder processing approach was used to study two alnico alloys (Full-Co and lower cost Co-Lean, both with enhanced coercivity) to anticipate high volume manufacturing needed to supply millions of permanent magnets to interior permanent magnet motors. In this study the two alloys were gas atomized, compression molded, and solid-state sintered to fabricate near-final shape alnico magnets. The Full-Co displayed abnormal grain growth (resulting in >1 mm size grains) during sintering while the Co-Lean did not (~20 μm – 400 μm sized grains depending on the sintering hold times). Solid state grain alignment was used to promote a <001> textured (easy axis) microstructure to enhance magnetic properties, yet both alloys did not show predicted grain alignment behavior. Comparisons of the powder processing, microstructures, and magnetic properties of the two alloys will be discussed, as well as an evaluation as to why non-theoretical processing behavior of the Full-Co and Co-Lean alnico permanent magnets is occurring. Preliminary interior permanent magnet motor designsmore » for alnico magnets are discussed, as this is the overarching objective for powder-based alnico permanent magnets.« less

Authors:
 [1];  [2];  [1];  [2];  [2];  [2]; ORCiD logo [3];  [4]
  1. Iowa State University
  2. Ames Laboratory
  3. ORNL
  4. Ames Laboratory and Iowa State University
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1550731
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: POWDERMET 2019: International Conference on Powder Metallurgy & Particulate Materials - Phoenix, Arizona, United States of America - 6/23/2019 8:00:00 AM-6/26/2019 8:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Rinko, Emily, Anderson, Iver, Kassen, Aaron, White, Emma, Tang, Wei, Zhou, Lin, Pries, Jason, and Kramer, Matthew. Investigation of Powder Processing, Heat Treating, and Texturing to Improve Gas Atomized alnico Magnets for use in Electric Drive Motors. United States: N. p., 2019. Web.
Rinko, Emily, Anderson, Iver, Kassen, Aaron, White, Emma, Tang, Wei, Zhou, Lin, Pries, Jason, & Kramer, Matthew. Investigation of Powder Processing, Heat Treating, and Texturing to Improve Gas Atomized alnico Magnets for use in Electric Drive Motors. United States.
Rinko, Emily, Anderson, Iver, Kassen, Aaron, White, Emma, Tang, Wei, Zhou, Lin, Pries, Jason, and Kramer, Matthew. Sat . "Investigation of Powder Processing, Heat Treating, and Texturing to Improve Gas Atomized alnico Magnets for use in Electric Drive Motors". United States. https://www.osti.gov/servlets/purl/1550731.
@article{osti_1550731,
title = {Investigation of Powder Processing, Heat Treating, and Texturing to Improve Gas Atomized alnico Magnets for use in Electric Drive Motors},
author = {Rinko, Emily and Anderson, Iver and Kassen, Aaron and White, Emma and Tang, Wei and Zhou, Lin and Pries, Jason and Kramer, Matthew},
abstractNote = {Alnico permanent magnet materials have been proposed as a rare earth free permanent magnet alternative during an ongoing search to replace rare earth permanent magnets that are used for interior permanent magnet motors, a common motor found in electric vehicles. A powder processing approach was used to study two alnico alloys (Full-Co and lower cost Co-Lean, both with enhanced coercivity) to anticipate high volume manufacturing needed to supply millions of permanent magnets to interior permanent magnet motors. In this study the two alloys were gas atomized, compression molded, and solid-state sintered to fabricate near-final shape alnico magnets. The Full-Co displayed abnormal grain growth (resulting in >1 mm size grains) during sintering while the Co-Lean did not (~20 μm – 400 μm sized grains depending on the sintering hold times). Solid state grain alignment was used to promote a <001> textured (easy axis) microstructure to enhance magnetic properties, yet both alloys did not show predicted grain alignment behavior. Comparisons of the powder processing, microstructures, and magnetic properties of the two alloys will be discussed, as well as an evaluation as to why non-theoretical processing behavior of the Full-Co and Co-Lean alnico permanent magnets is occurring. Preliminary interior permanent magnet motor designs for alnico magnets are discussed, as this is the overarching objective for powder-based alnico permanent magnets.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {6}
}

Conference:
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