Hybrid R-Fe-B/R-Co Magnets with Improved Thermal Stability

Abstract

Hybrid Pr2(Fe,Co)14B/Pr(Co,Fe)5 magnets with nanograin and micrograin structures were studied and synthesized in this project using various processes, including a rapid hot press and hot deformation process, a conventional sintering process, and a rapid induction sintering process. Hybrid Pr2(Fe,Co)14B/ Pr(Co,Fe)5 magnets demonstrated improved long-term thermal stability as compared with those containing no Pr(Co,Fe)5 components. The possibility of applying nanoparticles to synthesize bulk magnets was also explored. A PrCo5 nanopowder was produced by surfactant-assisted high-energy ball milling, and PrCo5 bulk magnets were successfully fabricated by compaction at 200 to approximately 525 degrees C using the nanopowder. The bulk magnet has cluster microstructure with nanocrystalline. The density of the bulk up to 92% theoretical value was obtained.

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Document Details

Document Type
Technical Report
Publication Date
Dec 23, 2009
Accession Number
ADA519522

Entities

People

  • A. Higgins
  • Chun-Hui Chen
  • Siqing Liu
  • Yangyang Shen

Organizations

  • University of Dayton Research Institute

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Curie Temperature
  • Electron Microscopes
  • Electron Microscopy
  • Fungi
  • Heat Treatment
  • High Energy
  • High Temperature
  • Laboratory Magnetometers
  • Magnetic Fields
  • Magnetic Materials
  • Magnetic Properties
  • Materials
  • Metallurgy
  • Nanoparticles
  • Particles
  • Permanent Magnets
  • Powder Metallurgy

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Superconducting Magnet Technology

Technology Areas

  • Biotechnology