ALNICO CERAMIC RARE EARTH ASSEMBLIES FILTRATION
 

 
APPLICATIONS
  • Separators
  • Sensors
  • Radar
  • Holding magnets
  • Coin acceptors
  • Motors
  • Relays
  • Controls
  • Generators
  • Receivers
  • Telephones
  • Microphones
  • Bell ringers
  • Guitar pickups
  • Loudspeakers
  • Security systems
  • Cow magnets
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    ALNICO MAGNETS

    Alnico magnets, composed of primarily aluminum, nickel, and cobalt, were developed in the 1940's. This class of magnet remains a preferred material because of its excellent temperature stability, high magnetic flux density, and resistance to corrosion. Alnico magnets are manufactured through a casting or sintering process. The casting process allows for the magnet to be manufactured into intricate and complex shapes. Sintered Alnico is made from a powdered mixture of ingredients that are pressed into a die under tons of pressure. The Sintering process allows for the magnets to be manufactured to tighter tolerances and higher mechanical strength.

    CAST ALNICO MAGNETS
    The most common Alnico cast magnets are in grades 1, 2, 3, 5, 6, 8, and 9. They are best suited for applications exposed to operating temperatures above 400 ° Fahrenheit. They maintain approximately 85% of their room-temperature strength up to 1000 ° F. They become completely demagnetized at approximately 1600 °F. For best results with Alnico 5 magnets, the length should be no less than 5 times the cross section diameter or the diameter of a circle equal in area to the cross section. See table below for grades and properties of cast Alnico magnets.
    Cast Alnico Magnet Grades & Properties
    Grade Br Hc (Bd Hd) max Curie Temp. Temp. Coe Max. Practical Operating Temp
    [Gs] [Oe] MGOe [ ˚ F] [%/ ˚ F] [ ˚ F]
    Alnico 1 7200 480 1.40 1490 0.016 842
    Alnico 2 7000 620 1.60 1490 0.016 842
    Alnico 3 6500 530 1.20 1490 0.016 842
    Alnico 5 12200 650 5.50 1580 0.011 977
    Alnico 6 10500 700 3.50 1580 0.011 977
    Alnico 8 8800 1500 5.50 1580 0.014 1022
    Alnico 9 10500 1410 9.00 1580 0.014 1022

    Br: Residual Induction
    Gs: Gauss
    Hc: Coercive Force
    Oe: Oersted
    Bd Hd: Maximum Energy Product
    ˚F Degree Fahrenheit

    Standard Tolerances (inches);
    Rod - Diameter (±0.002), Length (±0.005)
    Rectangle – Length & Width (±0.01), Thickness (±0.005)
    Ring – Outside Diameter (±0.002), Inside Diameter (±0.02), Thickness (±0.005)
    SINTERED ALNICO MAGNETS

    They have marginally lower magnetic properties, but better mechanical properties, than cast Alnico. Their fine grain structure results in highly uniform flux distributions and mechanical strength. So they are suited for applications requiring short magnets. See table below for grades and properties of cast Alnico magnets.
    Sintered Alnico Magnet Grades & Properties
    Grade Br Hc (Bd Hd) max Curie Temp. Temp. Coe Max. Practical Operating Temp
    [Gs] [Oe] MGOe [ ˚ F] [%/ ˚ F] [ ˚ F]
    SAlnico 2 7000 620 1.55 1490 0.008 842
    SAlnico 3 5800 1130 2.20 1580 0.011 842
    SAlnico 5 11000 600 4.25 1634 0.009 842
    SAlnico 6 10000 710 3.50 1562 0.011 842
    SAlnico 8 8800 1530 5.25 1562 0.011 842
    SAlnico 8HC 7000 1750 4.13 1580 0.011 842

    Br: Residual Induction
    Gs: Gauss
    Hc: Coercive Force
    Oe: Oersted
    Bd Hd: Maximum Energy Product
    ˚F Degree Fahrenheit

    Standard Tolerances (inches);
    Rod - Diameter (±0.002), Length (±0.005)
    Rectangle – Length & Width (±0.01), Thickness (±0.005)
    Ring – Outside Diameter (±0.002), Inside Diameter (±0.02), Thickness (±0.005)