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HOME > ALNICO MAGNETS
 
1 - Alnico
 

Alnico is usually manufactured in a foundry by a casting process. Patterns are needed and these can be expensive.
Alnico can also be sintered to form small, intricate and accurate shapes.

     
  cast alnico magnets  
     

The Alnico alloy consists mainly of Aluminium, Nickel, Cobalt and Iron.

Strengths - High temperature ability, high corrosion resistance, good magnetic stability.

Weaknesses - Poor resistance to demagnetisation, high cost

The most common grade is Alnico 5 and it has the following properties

 
Br (Gauss) 12,500 (The amount of magnetism)
Hc (Oersteds) 640 (It's resistance to demagnetisation)
BH max (MGOe) 5.5 (Derived from the above two)
Density (gm/cm3) 7.3 weight in grams per cm3
Max operating temp 540 (Degrees C)
Temp. coefficient -0.02 loses 0.02% of its Br value per degree C rise in temperature

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