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Customized Sintered Alnico Magnets
Sintered Alnico magnets are formed by compacting fine Alnico powder
in a press and then sintering the compacted powder into a solid
magnet. The powdered mixture of contents is pressed into a die
under tons of pressure. It is then sintered in a hydrogen
atmosphere at 2300F and then cooled either within a magnetic field
or without a magnetic field. When cooled within the magnetic field
it is known as an anisotropic magnet and when cooled outside of a
magnetic field it is called an isotropic magnet. The sintering
process is well suited to large volume production.
Up to 0.125" Up to 3.18 mm
±.005" .13 mm
0.126" to 0.625" 3.20 to 15.88 mm
±.010" .25 mm
0.626" to 1.250" 15.90 to 31.75 mm
±.015" .38 mm
Advantages and Disadvantages of Alnico Magnets
Alnico Br as high as NdFeB at room temperature.
Can be used up to 450-550 degrees C (842-932F).
Least variation in magnetic output with temperature change of any
Can be cast in very large sizes.
Sintered alnico is usually limited to small to medium sizes and
Low coercivity (Hci) making them easy to demagnetise.
Complex cast alnico sometimes needs sand mold tooling which can be
expensive if existing tooling is not available.
Magnetic Property Parameters of Sintered Alnico
Equivalent MMPA Class
Maximum Energy Product
Reversible Temp. Coefficient