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Iron Chrome Cobalt FeCrCo

Iron Chrome Cobalt Magnets - Overview

 

Iron Chrome Cobalt magnets (FeCrCo) have similar properties to cast Alnico 5 but, unlike cast alnico, the FeCrCo magnets are actually reasonably malleable. The FeCrCo magnet material is semi-hard magnetically and exists in bar, rod, wire and also as thin rolled strip.

They are a replacement for CuNiFe magnetic material (CuNiFe is not commercially available any more).

 
 

Advantages of Iron Chrome Cobalt Magnets

  • • Malleable – FeCrCo is easier to machine than Alnico
  • • FeCrCo can be hot deformed
  • • The maximum recommended operating temperature is typically around +400 degrees C (752F)
  • • FeCrCo has a Hc varying typically from 50kA/m to 300kA/m. The value of Hc produced depends on the method of the final heat treatment (timescale, temperature and quench rate)
  • • FeCrCo usually does not require any corrosion coating
 

Disadvantages of Iron Chrome Cobalt Magnets

  • • If the final heat treatment is not performed, the magnetic performance is very poor
  • • The strips are usually thin. Thicker sheets and plate are not really possible
  • • Easily demagnetised or remagnetised in a different direction
 

Typical Applications for Iron Chrome Cobalt Magnets

  • • Compasses
  • • Hysteresis coupling applications e.g. a multi-pole permanent magnet rotor turning a FeCrCo disc by hysteresis
 

Example

A company wanted a customised needle for a compass they were designing. The needle could be produced to the shape, heat treated, painted and magnetised to their requirements.