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Alnico Magnets - Aluminium-Nickel-Cobalt Magnets



Product Information of Alnico Magnets
Further Information on Permanent Magnets
 
Alnico magnet material is an alloy of aluminum-nickel-cobalt which possesses an excellent temperature stability over a wide temperature range and high residual induction. Their maximum working temperature is about 500°C. It has strong corrosion resistance capability without any coating for surface protection.

However, its low coercive force limits its applications in many cases. Casting and sintering are two major processes used to manufacture the Alnico magnets. Alnico magnets with complex shapes may be manufactured by casting. Once the Alnico magnets are formed, it is difficult to machine or drill them due to the hard and brittle mechanical properties of Alnico. Magnets are casted or sintered as closely as possible to required sized so that abrasive grinding to finish dimensions and tolerances is minimized.

Sintered Alnico materials offer slightly lower magnetic properties but better mechanical characteristics than the cast Alnico materials. Sintered Alnico magnets are most suitable for small sizes. The desired mix of metal powders is pressed to shape and size in a die, then sintered at about 1700°C 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.
 

Manufacturing Process of Alnico Magnets

Process Sintered Alnico Cast Alnico
Stage 1 Raw Material Raw Material
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Stage 2 Mixing Mixing
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Stage 3 Power Melting
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Stage 4 Pressing Molding Casting
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Stage 5 Sintering Heat Treatment
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Stage 6 Heat Treatment Magnetic Testing
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Stage 7 Magnetic Testing Grinding
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Stage 8 Grinding Inspection
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Stage 9 Inspection Alnico Final Product
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Stage 10 Alnico Final Product  

Typical Demagnetization Curves of Alnico Magnets (Aluminium-Nickel-Cobalt)

 
 

Magnetization Directions of Permanent Magnets


oriented through thickness
axially oriented
axially oriented in segments

oriented laterally
multipole on one face
multipole oriented in segments
on outside diameter*
multipole oriented in segments
on one face

radially oriented *
oriented through
diameter *
multipole oriented in segments
on inside diameter*

radially oriented
diametrical oriented		 all available as isotropic or
anisotropic material.
* only available in isotropic
and certain anisotropic
materials only

Product Information of Alnico Magnets
Further Information on Permanent Magnets

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