Alnico magnets

Description

Alnico range

For a long time their remanence property remained unequalled and despite the modesty of their coercive field, they are still unequalled today for the following aspects:

  • Their ability to operate at high temperatures without loss
  • Their stability and durability
  • Their ability to calibrate magnetic performance
  • The ease with which they can be magnetized and demagnetized.

They are highly appreciated in sensors and measuring instruments, in calibrated or flow-switched magnetic circuits.

HOLDING FORCE

  • It is optimal when the magnet is in contact with a soft, flat, clean and sufficiently thick steel frame. It decreases for alloyed steels and cast iron (-30% for cast iron)
  • It decreases when there is an air gap (space between the part to be attracted and the pole face of the magnet).
  • It decreases by 0.04% per degree C. This loss is reversible.

SURFACE INDUCTION

  • In order to have a maximum surface value, the magnet must be bare and have a length, between the two polar faces, of about 5 times its diameter.
  • The value of the induction created by the Alnico decreases by 0.02% per degree C, as the temperature increases.
    This loss is reversible.

MECHANICAL STRENGTH

  • Of all the rigid magnetic materials, Alnico offers the best impact resistance.

RESISTANCE TO OXIDATION

  • Oxidation resistance is good in a normal atmosphere.

PRECAUTIONS FOR USE

  • Do not put magnets in repulsion.
  • Never slide them against each other, or leave a magnet against a part to be attracted: they can lose up to 30% of their attraction power.
Ressources
Fiche Matériau Alnico
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Courbes caractéristiques B(H) des nuances ALNICO
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Our materials

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