One of Shanghai CJ Magnet's main products is rare-earth samarium cobalt (SmCo). SmCo magnet is a light rare earth magnet. It is a permanent magnet made of samarium, cobalt, and other metal materials. It was successfully developed in 1970.
SmCo magnet’s production process is similar to sintered NdFeB. According to its composition, SmCo can be divided into two categories: SmCo5 and Sm2Co17, the first and second-generation rare-earth permanent magnet materials, respectively. The main component, samarium, has low reserves of iron on the planet. So the price is also costly; the density of the SmCo magnet is 8.3g/cm3.
Its main features are relatively high magnetic properties and good temperature resistance. Samarium cobalt magnets have higher magnetic energy product products and higher coercivity. Compared with neodymium iron boron, samarium cobalt is more suitable for working in a high-temperature environment (the highest temperature resistance is 350 degrees), and it has good corrosion resistance. Therefore, no coating is generally required, and sometimes Ni plating is selected to play a specific protective role. However, due to the particularity of the molecular structure of samarium cobalt, it is relatively fragile and easy to crack.
Main applications: motors that require high-temperature resistance, aerospace, defense industry, sensors, magnetic transmission equipment, etc.