Internal defect detection and characterization of samarium-cobalt sintered magnets by ultrasonic testing technique

Cui, Baozhi; Cui, Jun; Barnard, Daniel J.; Bond, Leonard J.

doi:10.1016/j.jmmm.2023.170524

Internal defect detection and characterization of samarium-cobalt sintered magnets by ultrasonic testing technique

Journal Article · Sat Feb 11 00:00:00 EST 2023 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2023.170524· OSTI ID:1959192

Cui, Baozhi ^[1]; Cui, Jun ^[2]; Barnard, Daniel J. ^[3]; Bond, Leonard J. ^[3]

Ames Lab., Ames, IA (United States)
Ames Lab., and Iowa State Univ., Ames, IA (United States)
Iowa State Univ., Ames, IA (United States)

Excessive quantities of samarium-cobalt (Sm-Co) magnet material are being scrapped needlessly due to a lack of understanding of inhomogeneity distribution and unacceptable internal defects. If there is a way to identify, locate, characterize and when needed separate the defective portions of magnet material, utilization can be increased and product quality improved. Further, the magnets’ magnetic and mechanical performance can be improved by reducing the occurrence of internal defects. This paper reports on a cost-effective and efficient nondestructive evaluation method based on an ultrasonic testing (UT) technique applied for detecting and characterizing internal defects in Sm-Co sintered magnets. Applying the UT technique will allow users to comprehensively analyze internal defects, such as inclusions, porosity, microcracks, and other structural irregularities, check for homogeneity and anomalous regions and give the locations of these internal anomalies and defects within the Sm-Co sintered magnets. The UT technique can also be applied to other rare-earth permanent magnets, such as sintered or die-upset neodymium-iron-boron (Nd-Fe-B) magnets. The UT technique can effectively guide quality control and acceptable product selection, in addition to optimizing the magnet alloy design and production processes. Therefore, it can facilitate the improvement of magnet manufacturing efficiency and machinability, reduce scrap, prolong service life, increase the use of what would be post-production waste, and enhance product reuse and recycling at end-of-life disposition.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Office (AMMTO); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1959192

Report Number(s):: IS-J 11,002

Journal Information:: Journal of Magnetism and Magnetic Materials, Journal Name: Journal of Magnetism and Magnetic Materials Vol. 570; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Internal defect detection and characterization
Microcracks and inclusions
Sm-Co sintered magnets
Ultrasonic testing technique

Internal defect detection and characterization of samarium-cobalt sintered magnets by ultrasonic testing technique

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References (18)

Figures / Tables (12)

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