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Compression Molding of Anisotropic Ndfeb Bonded Magnets in a Polycarbonate Matrix

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Document pages: 25 pages

Abstract: Anisotropic bonded Nd2Fe14B (NdFeB) magnets in a polycarbonate (PC) binder matrix are fabricated into a near-net shape using a compression molding process. The weight fractions (w.f.) of NdFeB in PC 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 Hci = 942.99 kA m­­, remanence Br = 0.86 T, and energy product (BH)max = 120.96 kJ m3. The tensile properties are in the range of 27-59 MPa, displaying higher tensile strength compared to that of polyamide (PA) and polyphenylene sulfide (PPS) bonded magnets. Scanning electron microscopy showed the onset of failure occurs in the magnetic particle- matrix interface. This study demonstrates compression additive molding technique can be used to fabricate high performance NdFeB polycarbonate composite magnets with improved mechanical properties.

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