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What are the maximum recommended operating temperatures for different magnet materials?

What are the maximum recommended operating temperatures for different magnet materials?

The maximum temperature that a magnet may be effectively used at depends greatly on the 'permeance coefficient' - which is a function of the magnetic circuit - the magnet is operating in. The higher the permeance coefficient (the more 'closed' the circuit), the higher temperature at which the magnet may operate at, without becoming severely demagnetized. Shown here are approximate maximum operating temperatures for the various classes of magnet material. At temperatures close to those listed here, special attention may be needed in order to ensure that the magnet will not become demagnetized.

 

 

 

Material

Approx. Maximum Operating Temperatures

 

C

F

   NdFeB

140

284

   SmCo

300

572

   Ferrite

300

572

   Alnico

540

1,004

   Flexible

100

212