Rare earth-magnets

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  • 1. Rare Earth Magnets
  • 2. History– Loadstones (Fe3O4)– Steels– Alnicos (Al, Ni, Co, and Fe)– Ferrites– Rare-Earth• Samarium-Cobalt• Neodymium-Iron-Boron
  • 3. What Makes a Magnet• Quantum Level• Spinning and OrbitingElectrons• Hysteresis Loop• Crystal Structure– Tetragonal Symmetry• Rare-Earth Element– High CurieTemperature– High Magnetization– High Coercivity– High Remanence
  • 4. Processing Rare-Earth Magnets• Classifications– Bonded• Compressing a mixture of NdFeB alloy flakes with a resinbonding agent– Sintered• Powdered alloy (3-5 micrometers) is aligned in anelectromagnetic coil, pressed into shape, and then sintered at1000 degrees Celsius• High Corrosion Factor– Types of coatings• Aluminum ion deposition• Nickel plating• Epoxy-resin Painting• Electrolytic Deposition
  • 5. Applications of Rare-EarthMagnets• 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)
  • 6. Applications of Rare-EarthMagnets• 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)