High Performance (Nd,Pr)-(Fe,Co)-B Magnets

Abstract

This project was focused on the advanced Nd(Pr)-Fe-B based magnets. The aim of this study was twofold: (1) to develop high performance nanocomposite R2Fe14B/alpha-Fe magnets through adjustments in chemical compositions and processing conditions; and (2) to investigate the effect of small substitutions on the coercivity of the higher energy product (BH)m Nd-Fe-B sintered magnets in an attempt to increase their coercivity without decreasing much their remanent magnetization. The studies on nanocomposite magnets have been very successful and led to the development of Pr-Th-Fe-Nb-B magnets with (BH)m=17.3 MGOe. In the other project, Ga substitution was found to alter the intergranular morphology and chemical composition, and thus significantly increase the coercivity through domain wall pinning/nucleation.

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Document Details

Document Type
Technical Report
Publication Date
May 31, 2002
Accession Number
ADA402253

Entities

People

  • George C. Hadjipanayis

Organizations

  • University of Delaware

Tags

Communities of Interest

  • Energy and Power Technologies
  • Human Systems

DTIC Thesaurus Topics

  • Chemical Composition
  • Coercivity
  • Domain Walls
  • Electron Microscopy
  • Energy
  • Grain Size
  • Heat Treatment
  • Magnetic Properties
  • Magnetization
  • Magnets
  • Microstructure
  • Nanocomposites
  • Nucleation
  • Scanning Electron Microscopy

Fields of Study

  • Materials science

Readers

  • Superconducting Magnet Technology
  • Systems Analysis and Design