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Casting AlNiCo Magnet

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Casting AlNiCo Magnet


Alnico magnets are composed predominantly of aluminum, nickel, and cobalt with minor amounts of other elements including titanium and copper, permit design latitudes providing high indications, high energies and relatively high coercivities. AlNiCo magnets are characterized by excellent temperature stability and good resistance to demagnetization from vibration and shock, besides they offer the best temperature characteristics of any standard production magnet material available. They can be used for continuous duty applications where temperature extremes up to 930F can be expected.

Alnico magnets are manufactured through either a casting or sintering process. Cast AlNiCo magnet is very hard and brittle. Machining or drilling can not therefore be accomplished by ordinary methods. Holes are usually cored in at the foundry. Magnets are cast or sintered as closely as possible to required sized so that abrasive grinding to finish dimensions and tolerances is minimized.

Special casting techniques are used to achieve the unique crystalline grain orientation found in the alnico 5 and 8 grades. These anisotropic grades are designed to produce high magnetic output in a specified direction. Orientation is achieved during heat treatment, by cooling the casting from 2000F at a controlled rate within a magnetic field which conforms to the preferred direction of magnetization. Alnico 5 and Alnico 8 are anisotropic and exhibit a preferred direction of orientation. Magnetic orientation should be specified on your drawing when you send an order to us.

Cast Alnico 5 is the most commonly used of all the cast AlNiCo's. It combines high indications with a high energy product of 5 MGOe or more, and is used extensively in rotation machinery, communications, meters and instruments, sensing devices and holding applications. The higher resistance to demagnetization(coercive force) of AlNiCo 8, cobalt content to 35%, allows this material to function well for short lengths or for length to diameter ratios of less than 2 to 1.

Sintered Alnico magnet offers slightly lower magnetic properties but better mechanical characteristics than the cast Alnico materials. Sintered Alnico magnets are most suitable in small sizes(less than 1 oz.) in this process. The desired mix of metal powder is pressed to shape and size in a die, then sintered at 2300 F in a hydrogen atmosphere. The sintering process is well suited to large volume production, and results in parts which are structurally stronger than cast magnets. Relatively close tolerances can be achieved without grinding.

The Characteristics of casting AlNiCo Magnet:

  • Small changes in magnetic properties to temperature effects
  • Maximum working temperature can be as high as 450°C~550°C
  • Low coercive force
  • Strong corrosion resistance capability, no coating is needed for surface protection
  Remanence Coercivity Maximun Energy Temp. Coefficient
Of Br
Temp. Coefficient
Of Hcj
Material Br Hcb (BH)Max α(Br) α(Hcj)
Grade MT KA/M KJ/M3 %/C° %/C°
  Gs Oe MGOe
LN10 600/6000 40/500 10.00/1.20 -0.02 0.03
LNG12 700/7000 44/550 12.00/1.50 -0.02 0.03
LNG13 680/6800 48/600 13.00/1.63 -0.02 0.03
LNG18 900/9000 48/600 18.00/2.25 -0.02 0.03
LNG37 1200/12000 48/600 37.00/4.63 -0.02 0.03
LNG40 1250/12500 48/600 40.00/5.00 -0.02 0.03
LNG44 1250/12500 52/650 44.00/5.50 -0.02 0.03
LNG52 1300/13000 56/700 52.00/6.50 -0.02 0.03
LNG56 1300/13000 58/720 56.00/7.00 -0.02 0.03
LNG60 1330/13300 60/750 60.00/7.50 -0.02 0.03
LNGT18 580/5800 90/1130 18.00/2.25 -0.02 0.03
LNGT30 1100/11000 56/700 30.00/3.75 -0.02 0.03
LNGT32 800/8000 100/1250 32.00/4.00 -0.02 0.03
LNGT38 800/8000 110/1380 38.00/4.75 -0.02 0.03
LNGT44 850/8500 120/1500 44.00/5.50 -0.02 0.03
LNGT48 900/9000 120/1500 48.00/6.00 -0.02 0.03
LNGT60 950/9500 110/1380 60.00/7.50 -0.02 0.03
LNGT72 1050/10500 112/1400 72.00/9.00 -0.02 0.03
LNGT88 1100/11000 115/1450 88.00/11.00 -0.02 0.03
LNGT36J 700/7000 140/1750 36.00/4.50 -0.02 0.03
LNGT52J 900/9000 140/1750 52.00/6.50 -0.02 0.03

Typical Applications of casting AlNiCo magnet:

  1. Widely used in applications such as instruments and meters which require very stable temperature properties.
  2. Electronic ignition systems, watt bour meters, volt-amp meters, medical instruments, industrial motors, magnetic reed switches, generators, hand tools, vending machines.

Rod Magnet  block magnet
Ring Magnet  Horseshoe magnet
alnico cow Magnet  Rectangular Magnet

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