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Rare Earth Magnets

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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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 Orbiting Electrons Hysteresis Loop Crystal Structure Tetragonal Symmetry Rare-Earth Element High Curie Temperature High Magnetization High Coercivity High Remanence

  4. 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

  5. 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)

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