SMC05
1:5 Samarium Cobalt
1:5 samarium cobalt, also known as SmCo₅, is a magnetic material composed of samarium, cobalt, and in some formulations, praseodymium. It is produced by smelting, crushing, pressing, and sintering. The maximum energy product of this grade ranges from 16–25 MGOe, with a maximum operating temperature of 250°C. While its magnetic energy product is lower than that of 2:17 samarium cobalt, its mechanical properties and ductility are slightly better, making it easier to machine and less brittle. For example, 1:5 samarium cobalt can be processed into complex shapes like blocks, rings, and special profiles with thin walls, whereas 2:17 samarium cobalt is typically limited to simpler geometries.
In addition, the magnetizing field required to saturate a 1:5 samarium cobalt magnet is generally 4,000 gauss, which is smaller than the 6,000 gauss or higher needed for 2:17 high-coercivity samarium cobalt. The rare earth content in 1:5 samarium cobalt is nearly 40%, making it more costly than 2:17 samarium cobalt. When designing, users can select 1:5 or 2:17 samarium cobalt magnets based on their specific application requirements.
SM2C017
2:17 Samarium Cobalt Magnet
2:17 samarium cobalt magnet, also known as Sm₂Co₁₇, is a magnetic material composed of samarium, cobalt, copper, iron, and zirconium, produced via smelting, crushing, pressing, sintering, and aging. Its maximum energy product ranges from 20–35 MGOe, and its maximum operating temperature is 350°C. The 2:17 grade offers a low temperature coefficient, excellent corrosion resistance, and magnetic performance that surpasses NdFeB magnets at high temperatures. It is widely used in aerospace, military, high-temperature motors, automotive sensors, magnetic drives, magnetic pumps, microwave devices, and other high-end applications.
2:17 samarium cobalt is extremely brittle and difficult to process into complex shapes, especially thin flakes and thin-walled rings. Additionally, small machining defects or process deviations during manufacturing can affect magnetic performance or functionality, so only qualified products are considered acceptable. Important safety note: During assembly, users must exercise caution to avoid the attraction between magnets or iron components, which can cause the magnet to break or result in personal injury.
The Sm₂Co₁₇ magnet is not easily saturated or magnetized. If users need to magnetize it themselves, they must confirm the magnetic field strength of their magnetizing equipment and select the appropriate grade accordingly.
Applications
Samarium cobalt magnets—also referred to as samarium cobalt permanent magnets or rare-earth cobalt permanent magnets—are composed of samarium, cobalt, and other rare-earth materials. They are produced via proportioning, smelting, crushing, pressing, and sintering. These magnets offer an extremely high magnetic energy product, excellent low-temperature coefficient, a maximum operating temperature of up to 350°C, and no upper limit on negative temperature performance. When the operating temperature exceeds 180°C, their magnetic energy product, temperature stability, and chemical stability outperform NdFeB permanent magnets. They also exhibit strong corrosion and oxidation resistance.
As a result, they are widely used in aerospace, defense, microwave devices, communications, medical equipment, instruments, meters, magnetic transmission devices, sensors, magnetic processors, motors, magnetic cranes, and other industrial fields.