Bulk Nanocomposite LaCo5/LaCo13 Magnets (POSTPRINT)

Abstract

The effects of processing parameters and composition on the magnetic properties and microstructure of nanocrystalline La-Co-based hard magnetic materials were investigated. Bulk nanocomposite LaCo5/LaCo13 magnets were fabricated by mechanical alloying of LaCo5 and La2Co7 powder mixtures and subsequent hot pressing at 580-810 deg C. A high coercive field (Hc) of over 16 kOe with a smooth demagnetization curve was obtained in a composition range of 25-30 wt. % La2Co7 when hot-pressed at 660-760 deg C. Microstructural investigations indicated that the magnets consist of a primary LaCo5 phase with grain sizes of 200-400 nm, coexisting with 20-100 nm grains of LaCo13 located both at the grain boundaries and within the hard LaCo5 grains.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2012
Accession Number
ADA566254

Entities

People

  • John Horwath
  • Meiqing Huang
  • Yuhui Shen
  • Zafer Turgut

Organizations

  • University of Dayton

Tags

Communities of Interest

  • Advanced Electronics
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Boundaries
  • Crystal Structure
  • Demagnetization
  • Electron Microscopy
  • Grain Boundaries
  • Grain Size
  • Hot Pressing
  • Magnetic Materials
  • Magnetic Properties
  • Materials
  • Materials Processing
  • Microstructure
  • Nanocomposites
  • Permanent Magnets
  • X Rays

Fields of Study

  • Materials science
  • Physics

Readers

  • Materials Science and Engineering.
  • Thin Film Deposition Science.