What are Sintered AlNiCo magnets?

- May 06, 2019-

Alnico alloys are composed primarily of Cobalt, Nickel, and Aluminum with the addition of Iron, Copper, and sometimes Titanium that help make them become stronger permanent magnets. They can be magnetized to produce strong magnetic fields. Alnico magnets produce magnetic fields with strength at their poles as high as 1500 gauss, or about 3000 times the strength of the earth’s magnetic field.

Cast Alnico can be processed to be intricate and complex shapes to meet customer’s demand . Some types of Alnico are isotropic, meaning they can be efficiently magnetized in any direction. Other types, such as Alnico 5 and Alnico 8 are anisotropic, meaning they have a preferred direction of magnetization, orientation. Anisotropic magnets generally have a greater magnetic capacity in their preferred orientation than isotropic. Anisotropic Alnico magnets, cast alnicos are oriented by heating them above a critical temperature and cooling them in the presence of a magnetic field.

Unlike casted Alnico magnets, sintered Alnico magnets, cast alcomax, cast alnico magnet, teaching magnet, education magnet offer lower magnetic properties but better mechanical characteristics. Mixes of metal powders are pressed to shape and size, and then sintered at 2300oF in a hydrogen atmosphere. The sintering process is well suited to large volume production, and results in parts that are structurally stronger than cast magnets. Relatively close tolerances can be achieved without grinding.

Why choose Alnico magnet? 

1. High energies and relatively low coercivity. 
2. Excellent ability to withstand extreme temperatures stability (as high as 500℃, 930℉)
3. High magnetic flux density, and resistance to demagnetization from vibration and shock. 
4. Typical Applications for Alnico Magnets.

Electronic ignition systems

Volt-amp meters

Industrial motors


Vending machines

Watt hour meters

Medical instruments

Magnetic reed switches

Hand tools

alnico magnets