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As one of the members of magnets family, Alnico remains the workhorse of the permanent magnet industry and can be relied upon to deliver impressive flux density at an economical price. Alnico also boasts the lowest temperature coefficient of any commercial magnet material (0.02% per degree centigrade) allowing for excellent stability over a wide temperature range.
The most efficient
use of Alnico requires that it be magnetized after the magnet has
been assembled with its pole pieces into the final magnetic circuit.
Magnetic saturation at the end-use location requires the application
of a magnetizing force 4 to 5 times greater than the coercive force
of the material. For Alnico 5, a magnetizing force of 3000 oersteds
(240 KA/m) is recommended. For Alnico 8, the magnetizing force
should be at least 7000 oersteds (560 KA/m). The magnetizing force
need be applied only momentarily. Thus, impulse magnetizers
employing a capacitor discharge are commonly used. Direct current
magnetizers are also effective.
Alnico magnets offer
excellent stability with respect to temperature changes: reversible
change is 0.02% per degree Centigrade. Heating may produce an
irreversible loss of magnet strength. The magnitude of loss depends
upon the dimensions of the magnet and its composition, but is
usually less than 5%, and may be recovered by re-magnetization. At
temperatures exceeding 1000oF (538ºC), a metallurgical change takes
place which causes magnetic strength to reduce rapidly. This change
will not be recovered by re-magnetization.
Please view our Alnico magnet material specification below:
The following products series are available:
* Cow magnets
* Horseshoe magnet
* U-shaped magnet
* Disc magnet
* Round bar magnet
* Rectangular magnet
* Rotor magnet with multi poles
* Button magnets
* Ring magnets
* Pick ups
More information will be available by sending e-mail to:
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