Samarium cobalt magnet is one of the rare earth permanent magnets. It includes SmCo5 (1:5), and Sm2Co17 (2:17).
Compared with neodymium magnets, the biggest feature of samarium cobalt magnets is that it has superior anti-corrosive and oxidation resistance. So they don’t need any coating.
Due to excellent properties, we can hardly see any SmCo magnet in daily supplies. They are mainly for use in aerospace, national defense, microwave devices, communication, medical equipment, instruments, and meters, all kinds of the magnetic transmission device, sensor, magnetic processor, and voice coil motor, magnetic crane.
The BH(max.) ranges from 16 MGOe to 32 MGOe. So it is the only one type of rare earth magnet that can be close to low grade sintered neodymium magnet.
Meanwhile, the high-temperature resistance of SmCo magnet is from 250℃ to 350℃, the Curie temperature is from 700℃ to 840℃. That’s what makes the SmCo magnet different – high magnetic property, high working temperature.
But if you need a coating for nice appearance or enhance anti-corrosive performance, they can be plated with nickel, zinc, gold, or epoxy or other coatings.
In regard to SmCo magnet application, they are used chiefly in a very complex working environment because of good magnetic stability. So they are very suitable for manufacturing various high-performance permanent magnet rotor.
For more information, please visit https://www.stanfordmagnets.com/