Fracture Strength and Surface Magnetic Flux Uniformity in an Isotropic Polymer-Bonded Ring-Shaped Nd-Fe-B Magnet

FARZAM MEHR, Navid, Sahand BEHRANGI, Milad AHMADI and Abbas KIANVASH. Fracture Strength and Surface Magnetic Flux Uniformity in an Isotropic Polymer-Bonded Ring-Shaped Nd-Fe-B Magnet. JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE. NEW YORK: SPRINGER, 2018, vol. 27, No 8, p. 3972-3977. ISSN 1059-9495. Available from: https://dx.doi.org/10.1007/s11665-018-3494-4.

Basic information

• Original name: Fracture Strength and Surface Magnetic Flux Uniformity in an Isotropic Polymer-Bonded Ring-Shaped Nd-Fe-B Magnet
• Authors: FARZAM MEHR, Navid, Sahand BEHRANGI, Milad AHMADI and Abbas KIANVASH.
• Edition: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, NEW YORK, SPRINGER, 2018, 1059-9495.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Confidentiality degree: is not subject to a state or trade secret
• Impact factor: Impact factor: 1.476
• Doi: http://dx.doi.org/10.1007/s11665-018-3494-4
• UT WoS: 000440433900018
• Keywords in English: magnetic properties; Nd-Fe-B; polymer-bonded ring-shaped magnets; surface magnetic flux uniformity; tensile fracture strength
• Tags: RIV ne

Abstract

Ring-shaped (RS) polymer-bonded magnets were produced from a mixture of an isotropic nanocrystalline Nd-Fe-B powder with a nominal composition of 59.8 wt.% Fe, 29 wt.% Nd, 5 wt.% Zr, 4.8 wt.% Co and 1.4 wt.% B and a variety of epoxy resins as binders, using a compaction-molding technique. The morphology and average particle size of the powders are determined by an SEM. The magnetic properties of the magnets were measured using a permeameter. Magnetic flux on the surface of the magnets was determined by a Gauss meter. The mechanical properties of the RS specimens were determined using a tensile fracture strength (FS) test. The effects of polymer type and amount, hardener amount, applied pressing pressure and curing temperature and time on FS were investigated. The experimental results showed that at optimal conditions of 8 wt.% solid epoxy, 3.5 wt.% solid hardener, a pressing pressure of 900 MPa and a curing time of 8 h at 170 degrees C, a maximum tensile strength of similar to 36 MPa was achieved. Surface magnetic flux uniformity in optimal mechanical conditions was also found to be optimum at around +/- 40 G, which is one of the best flux uniformities in bonded magnets.