Cryogenically Crushed Ni Zn Ferrites.

Abstract

A high density Ni Zn ferrite, with high permeability and high Q factor for RF applications, has been developed by utilizing a new cryogenic crush procedure. In this procedure, extensive grinding, which is normally required to obtain small particle size, is replaced by crushing the calcined ferrite under liquid nitrogen plus a short ball mill cycle prior to sintering. Permeabilities of 20 at a Q of 100 were obtained on toroidal samples tested at 350 MHz. Magnetic properties were determined by applying a bias field greater than needed for resonance parallel to the axis of the toroid. The study includes the effects of hot-pressing temperature and crushing procedure variables on the magnetic and physical properties of the ferrite. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1971
Accession Number
AD0721587

Entities

People

  • Janina J. Mitchell

Organizations

  • United States Army Communications-Electronics Command

Tags

DTIC Thesaurus Topics

  • Ball Mills
  • High Density
  • Hot Pressing
  • Magnetic Properties
  • Mechanical Properties
  • Nitrogen
  • Particle Size
  • Particles
  • Permeability
  • Physical Properties
  • Q Factor
  • Resonance
  • Sintering

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Microwave Engineering.