FeCrCo Magnets

Iron Chrome Cobalt FeCrCo

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).

FeCrCo Magnets for compass

FeCrCo Magnets for compass

Advantages
• 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
• 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
• 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.

 

FeCrCo-Crovac

Iron chromium Cobalt (FeCrCo) magnets are similar to Alnico magnets in magnetic property, but they have better mechanical property. FeCrCo alloys can be easily hot deformed and machined. There are practically no limitations of their shapes and sizes. They can be made to block, square rods, round rods, tube, strips, wire. FeCrCo magnets are beneficial combination of magnets and mechanical properties. Their maximum working trmperature can be as high as 400°C.

FeCrCo Characteristics:
FeCrCo Can be made to small and complex shape components. Its minimum diameter can reach 0.05mm and the thinnest thickness can reach 0.1mm, so it is suitable for the production of high-precision components. It has good temperature stability and corrosion resistance. The high Curie temperature is about 680℃ and the highest wroking teperature can reach 400℃ .

Iron-Chrome-Cobalt permanent magnets are a malleable, magnetically semi-hard alloy which is available in cast form (see the Alnico Magnet section) and as thin rolled strip,bar,rod or wire  from Rolled Products facility. It is an excellent material for hysteresis coupling and for sensor applications. It is also a substitute for CuNiFe, which is no longer commercially available.

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