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Alnico

Alnico

Introduction

Alloy magnets on the basis of Al-Ni and Al-Ni-Co are material types with a long tradition. Although the sector of manufacturing advanced magnet types on the basis of rare earths is rapidly developing, alloy magnets continue to hold an important market share.
In the course of their development they made considerable advances in magnetic parameters – the manufacture of anisotropic variants, and shape requirements – application of precise casting methods.

Properties

Alnico magnets are manufactured using foundry technologies just like other special steels. The material is relatively hard. Its machining, except grinding, is very difficult.
After magnets of rare earths, Alnico magnets have the highest magnetic energy, coercivity and remanence. A high Curie temperature predetermines them for deployment at increased temperatures.

Applications

Alnico magnets are used in the following areas:
  • electric motors of medium size,
  • generators, loudspeakers,
  • acoustic transducers,
  • electrometers,
  • electric measuring instruments,
  • retaining industrial systems


Magnetic properties - Alnico

Class Coercivity Remanence Max. product Curie temperature
HcB [kA/m] Br [mT] (BH)max [kJ/m3] oC
LNG12 1) 45 720 12.4 810
LNG 37 48 1200 37.0 860
LNG 40 48 1250 40.0 860
LNG 60 59 1350 60.0 860
LNGT 32 100 800 32.0 860
LNGT 40 110 800 40.0 860
LNGT 60 110 900 60.0 860
LNGT 72 112 1050 72.0 860

1) isotropic

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