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Rare Earth Magnets - PowerPoint PPT Presentation


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Rare Earth Magnets. History. Loadstones (Fe 3 O 4 ) Steels Alnicos (Al, Ni, Co, and Fe) Ferrites Rare-Earth Samarium-Cobalt Neodymium-Iron-Boron. What Makes a Magnet. Quantum Level Spinning and Orbiting Electrons Hysteresis Loop Crystal Structure Tetragonal Symmetry

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Presentation Transcript
history
History
  • Loadstones (Fe3O4)
  • Steels
  • Alnicos (Al, Ni, Co, and Fe)
  • Ferrites
  • Rare-Earth
    • Samarium-Cobalt
    • Neodymium-Iron-Boron
what makes a magnet
What Makes a Magnet

Quantum Level

Spinning and Orbiting Electrons

Hysteresis Loop

Crystal Structure

Tetragonal Symmetry

Rare-Earth Element

High Curie Temperature

High Magnetization

High Coercivity

High Remanence

processing rare earth magnets
Processing Rare-Earth Magnets

Classifications

Bonded

Compressing a mixture of NdFeB alloy flakes with a resin bonding agent

Sintered

Powdered alloy (3-5 micrometers) is aligned in an electromagnetic coil, pressed into shape, and then sintered at 1000 degrees Celsius

High Corrosion Factor

Types of coatings

Aluminum ion deposition

Nickel plating

Epoxy-resin Painting

Electrolytic Deposition

applications of rare earth magnets
Applications of Rare-Earth Magnets

Aerospace

Frictionless Couplings

Auto Compass

Automotive

Medical

Magnetic Resonance Imaging

Dentures

Wound Closures

Optical Implants

Domestic

Head sets

Electric Clocks

Hearing Aids

Electronic Instrumentation

Sensors

Servo Motors (robotics)