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Alnico (Cast & Sintered)

Alnico Magnets - Overview

 

Alnico magnets have the best temperature coefficients of any magnet material. Alnico magnets are a best choice in extremely high temperature applications.

Alnico magnets are Cast or Sintered.

Weaker Isotropic alnico takes complex magnetic fields. Stronger anisotropic alnico has a fixed DoM axis.

Cast Alnico 5 is the most common grade of Alnico, with the LNG44 variant of Alnico 5 (Alcomax 3) being the most popular.

 

Advantages of Alnico Magnets

  • • Cast Alnico offers a near net shape. Cast alnico can be produced to complex shapes with complex magnetic patterns.
  • • Alnico Br as high as NdFeB at room temperature.
  • • Can be used up to 450-550 degrees C (842-932F).
  • • Least variation in magnetic output with temperature change of any magnetic material.
  • • Can be cast in very large sizes.
 

Disadvantages of Alnico Magnets

  • • Sintered alnico is usually limited to small to medium sizes and simpler shapes.
  • • Low coercivity (Hci) making them easy to demagnetise.
  • • Complex cast alnico sometimes needs sand mold tooling which can be expensive if existing tooling is not available.
 

Typical Applications for Alnico Magnets

  • • Very high temperature applications
  • • Use in hot oils
  • • Clamping
  • • Motors and Generators
  • • Mass spectrometers
  • • Precision sensors and meters
  • • Aerospace
 

Example

A company was using Alnico to operate a Mass Spectrometer but they were struggling to achieve the required magnetic field to detect the materials they were testing for.

The solution was to use a higher strength of Alnico magnet assembly and then deliberately use the low coercivity of alnico to demagnetise it slightly to tune the magnetic field in the assembly air gap to the required field strength.

The thermal stability of the alnico meant that the field would be stable enough for the entire operation of the unit. In the laboratories.

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