Magnet
COMUS INTERNATIONAL
A good general purpose material that can be machined or cast to the
required shape prior to being magnetised. It has a maximum working temperature
of 550ºC and good corrosion resistance.
Composed mainly of alloys of Aluminium, Nickel and Cobalt, Alnico / Alcomax
magnets are manufactured by either sintering, or casting. Sintered magnets have
slightly lower magnetic properties to cast magnets, but have better mechanical
characteristics. Cast magnets allow for more complex shapes such as horseshoes, which
are not possible with other magnetic materials.
NEODYMIUM IRON BORON (NdFeB)
An alloy of the Lanthanide group of elements, and also known as Rare Earth
magnets, Neodymium Iron Boron (NdFeB) along with Samarium Cobalt (SmCo) are
the most advanced permanent magnet materials available today. There are various
grades available which satisfy a number of application requirements.
NdFeb magnets are available in sintered or bonded forms. Sintered magnets offer
the higher energy, however require some finishing techniques to keep to tight
tolerances not required using bonded forms.
FERRITE
Ferrite magnets are sintered permanent magnets composed of Barium or
Strontium Ferrite. Aside from having good resistance to demagnetization they have
the popular advantage of being low cost.
Ferrite magnets are very hard, but also very brittle, and as such require
specialized machining techniques. They are machined in an unmagnetized state.
Anisotropic grades are oriented in the manufacturing direction, and must be
magnetized in the direction of the orientation.
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