Rare Earth Magnets
History– Loadstones (Fe3O4)– Steels– Alnicos (Al, Ni, Co, and Fe)– Ferrites– Rare-Earth• Samarium-Cobalt• Neodymium-Iron-B...
What Makes a Magnet• Quantum Level• Spinning and OrbitingElectrons• Hysteresis Loop• Crystal Structure– Tetragonal Symmetr...
Processing Rare-Earth Magnets• Classifications– Bonded• Compressing a mixture of NdFeB alloy flakes with a resinbonding ag...
Applications of Rare-EarthMagnets• Aerospace– Frictionless Couplings– Auto Compass• Automotive• Medical– Magnetic Resonanc...
Applications of Rare-EarthMagnets• Aerospace– Frictionless Couplings– Auto Compass• Automotive• Medical– Magnetic Resonanc...
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Rare earth-magnets

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Rare earth-magnets

  1. 1. Rare Earth Magnets
  2. 2. History– Loadstones (Fe3O4)– Steels– Alnicos (Al, Ni, Co, and Fe)– Ferrites– Rare-Earth• Samarium-Cobalt• Neodymium-Iron-Boron
  3. 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. 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. 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. 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)

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