Performance Curve – BH Demagnetization Curves
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AlNiCo BH curve:
Alnico alloys consist of aluminum, nickel, cobalt, copper, and iron. Some grades have titanium and some manufactures also use additions of silicon, columbium zirconium, or other elements to enhance the magnetic properties.
These alloys are formed by foundry processes as previously noted. The magnetic performance is developed by heat treating the castings. The heat treat process for most of the grade includes the application of a magnetic field to produce domain alignment.
Example of a SmCo BH curve:
SmCo magnets will outperform NdFeB magnets at temperatures above +150 to +180 degrees C.
SmCo magnets can be used at cryogenic temperatures (i.e. towards absolute zero, -273 degrees C).
The magnet shape, its environment, and the actual application affect how the NdFeB magnet will perform. Temperature is important as well as damp or wet conditions.
When determining suitability, you should analyse the Intrinsic curve not the Normal curve.
By keeping the intrinsic working point above the ‘knee’ and ideally at the BHmax working point maximum performance is possible.
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