High Performance Magnets

Abstract

Our efforts in this project were focused on three different materials, namely; interstitial Sm-Fe carbides and nitrides, high energy product Nd2Fe14B magnets with MgO addition, and nanocomposite Nd2Fe14B/alpha-Fe consisting of a fine mixture of hard and soft phases. In the Sm-Fe carbides and nitrides the interstitial C and N significantly change the anisotropy and Curie temperature of the 2:17 phase and make these materials attractive for permanent magnets. Addition of Ga and Cr lead to higher amounts of C in the 2:17 phase and to large coercivities in melt spun samples with fine microstructure. In Nd-Fe-B, the addition of MgO in sintered magnets leads to a Nd-Fe-Mg-O phase surrounding the 2:14:1 grains and causes a high coercivity. The addition of grain growth inhibitors (Nb) in nanocomposite R12Fe14B/alpha-Fe(R=Nd,Pr) magnets leads to a variety of crystallization behaviors with the discovery of metastable phases and the development of fine microstructures with high coercivity.

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Document Details

Document Type
Technical Report
Publication Date
Mar 29, 2000
Accession Number
ADA378878

Entities

People

  • George C. Hadjipanayis

Organizations

  • University of Delaware

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Anisotropy
  • Coercivity
  • Curie Temperature
  • Domain Walls
  • Fiber Spinning
  • Grain Growth
  • Grain Size
  • Magnetic Domains
  • Magnetic Materials
  • Magnetic Properties
  • Magnets
  • Materials
  • Materials Processing
  • Microstructure
  • Nanocomposites
  • Permanent Magnets
  • Students

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials
  • Superconducting Magnet Technology