Alnico permanent magnet  is a kind of alloy made from aluminum, nickel, cobalt, iron and other trace metal elements.
 
 
Alnico is the earliest developed permanent magnetic material which was developed in the 1930s.
At that time, Alnico's magnetic performance was the best with small temperature coefficient. Therefore, they were most widely used in the permanent magnet motor application.
Since the 1960s, with the emerging of ferrite magnets and rare earth magnets, Alnico magnets  application in motors was replaced gradually and the proportion was on a declining curve.
 
Alnico magnets are divided into Sintered Alnico and Cast Alnico. Disc, cylinder bar and rectangle bar are the most common shapes of Alnico magnets.
By casting process, Alnico material can be produced into different sizes and shapes.
Compared with casting technology, sintered Alnico magnets are limited to small sizes, and their dimensional tolerance is better than that of casting Alnico.  
Moreover, sintered Alnico magnets have better machinability, while their magnetic performance is slightly weaker than that of the casting products.
 
Super high temperature resistance and corrosion resistance are the significant advantages of Alnico magnets.
Their maximum operating temperature is up to 550 ~600 degree Celsius.
Alnico permanent magnets are mainly used in motors, sensors, medical instruments, hand tools, loudspeakers and all kinds of instruments.