Compression molding of anisotropic NdFeB bonded magnets in a polycarbonate matrix

Mungale, Kaustubh; Lamichhane, Tej N.; Wang, Haobo; Sales, Brian C.; Paranthaman, M. Parans; Vaidya, Uday Kumar

doi:10.1016/j.mtla.2021.101167

Compression molding of anisotropic NdFeB bonded magnets in a polycarbonate matrix

Journal Article · Wed Jul 28 00:00:00 EDT 2021 · Materialia

DOI:https://doi.org/10.1016/j.mtla.2021.101167· OSTI ID:1817504

^[1]; Lamichhane, Tej N. ^[2]; ^[3]; ^[2]; ^[2]; ^[1]

Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Institute for Advanced Composites Manufacturing Innovation (IACMI)-The Composites Institute, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States). Bredesen Center for Interdisciplinary Research and Graduate Education

Anisotropic bonded Nd₂Fe₁₄B (NdFeB) magnets in a polycarbonate (PC) binder matrix are fabricated using a compression molding process. The weight fractions (w.f.) of NdFeB in PC on the batch mixer are 20, 50, 75, 85 and 95% compared to the twin screw extruder with 20, 50 and 75% respectively. The density of the 95% batch mixed magnets fabricated was 5.34 g/cm³ and the magnetic properties are, intrinsic coercivity H_ci = 942.99 kA/m, remanence B_r = 0.86 T, and energy product (BH)_max = 120.96 kJ/m³. Furthermore, the measured tensile properties are in the range of 27-59 MPa, comparable to that of polyamide (PA), polyphenylene sulfide (PPS) bonded magnets and demonstrating potential for bonded magnet applications. Scanning electron microscopy showed that the onset of failure occurs in the magnetic particle- matrix interface. This study demonstrates that compression additive molding technique can be used to fabricate high performance NdFeB polycarbonate composite magnets with improved mechanical properties.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1817504

Journal Information:: Materialia, Journal Name: Materialia Journal Issue: 7 Vol. 19; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
NdFeB
bonded magnets
compression molding
polycarbonate
polymer batch mixing
twin screw extrusion

Compression molding of anisotropic NdFeB bonded magnets in a polycarbonate matrix

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