Effects of Ag on the magnetic and mechanical properties of sintered NdFeB permanent magnets

H. Chen, X. Yang, L. Sun, P. Yu, X. Zhang, L. Luo

Research output: Journal PublicationArticlepeer-review

13 Citations (Scopus)

Abstract

This paper investigates the effects of Ag on the magnetic and mechanical properties of sintered NdFeB permanent magnets. The microstructure of the NdFeB permanent magnets was characterised using scanning electron microscopy (SEM)with energy dispersive X-ray spectroscopy (EDS)analysis. 0.1 wt% of Ag was added to the overall NdFeB composition to study the effects of Ag on the microstructural changes. The NdFeB and NdFeB + Ag magnets exhibit a two-phase structure with the main Nd2Fe14B phase and the Nd-rich grain boundary phase. It is found that Ag is enriched in the Nd-rich grain boundary phase and tends to alloy with the minor element, Cu. An enhanced coercivity (Hcj)is obtained in the NdFeB + Ag whilst the remanence (Br)and maximum magnetic energy product ((BH)max)decrease due to the addition of 0.1 wt% Ag. Impact resistance tests were carried out to examine the impact toughness of NdFeB and NdFeB + Ag magnets. It is shown that the magnets still exhibit a brittle fracture behaviour and no significant increase in the impact resistance of the NdFeB + Ag magnet is presented.

Original languageEnglish
Pages (from-to)49-53
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume485
DOIs
Publication statusPublished - 1 Sep 2019

Keywords

  • Alloy elements
  • Impact toughness
  • Magnetic properties
  • Mechanical properties
  • NdFeB permanent magnets

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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