Magnetic materials category
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Magnetic materials basically contain Ferrite and Alnico, Sm-Co and Nd-Fe-B.The rare earth permanent-magnet material contains Sm-Co and Nd-Fe-B. At present the products widely applied are Ferrites. The product is inexpensive, following is the Nd-Fe-B.
The temperature stability of Alnico and Sa-Co are better than the Nd-Fe-B. So in some pointer instrument, military supplies and luxury goods, Al-Ni-Co and Sm-Co materials are widely used.
Curie temperature of Ferrites is 465℃, Nd-Fe-B 's is 310℃, Alnico's is 800℃, Sm-Co 's is 700℃--800℃. Therefore, temperature stability of Nd-Fe-B is the worst. But the performance is highest, which are called "magnetism king", Currently manufacture craft of magnetic materials is sintered and binder. As the binder are added adhesive bonding ，the magnetism performance will not be high, but the product precision is high.
