Samarium Cobalt Magnets
Samarium Cobalt Magnets are rare earth magnets that offer the best quality and value when comparing performance and size in high temperature environments. Samarium Cobalt Magnets are extremely strong and typically allow for smaller size magnet profiles. Samarium Cobalt Magnets are not as strong as Neodymium Magnets but they have three significant advantages: 1. Samarium Cobalt Magnets work over a wider temperature range; 2. Samarium Cobalt Magnets have superior temperature coefficients; and 3. they have a greater resistance to corrosion. Samarium Cobalt Magnets are extremely hard and brittle and should be protected from shock and mechanical forces when handled in their application. They resist corrosion and retain most of their energy up to 575° Fahrenheit, making them ideal replacements for Alnico when high temperature use or miniaturization is required. Samarium Cobalt Magnets offer excellent corrosion resistance and typically do not require a surface treatment. Samarium Cobalt magnets have good resistance to external demagnetizing fields because of its High Intrinsic Coercive Force (Hci). This resistance makes Samarium Cobalt rare earth magnets an excellent choice for electromechanical applications. Samarium Cobalt Magnets have good temperature stability (maximum use temperatures between 250 and 550 °C; Curie temperatures from 700 to 800 °C) Samarium Cobalt magnets are available in three grades; 18, 22 and 26. The Samarium Cobalt Magnet energy products of these alloys are 18 Mega Gauss Oersteds (MGOe), 22 (MGOe) and 26 (MGOe). The magnets are rich in cobalt and contain other elements such as iron and copper. Common applications and typical uses for Samarium Cobalt magnets include technical applications, such as computers, electronics, switches, and automotive “under-the-hood” applications, where elevated temperatures apply. Samarium Cobalt magnets are used in a variety of applications such as motors, compact high force magnetic assemblies, turbomachinery, dipole assemblies, microphones, speakers, sputtering arrays for vacuum deposition, triggering hall sensors, particle accelerators and many other applications. Samarium Cobalt magnets will work in applications that require the system to function at cryogenic temperatures or very hot temperatures (over 350°F or 180°C). In applications where performance is required to be consistent with temperature change, the flux density of a Samarium Cobalt magnet will vary under 5% per 100°C change in temperature (in the range of 25–250°C or 77°F-480°F). Rare Earth Sintered Samarium Cobalt magnets are extremely resistant to demagnetization and they can operate at temperatures up to 500°F (260°C). Samarium Cobalt magnets which are relatively thin compared to their pole cross-section (Magnetic Length / Pole Area) will demagnetize easier than Samarium Cobalt magnets which are thick. Magnetic geometries utilizing backing plates, yokes, or return path structures will respond better to increased temperatures. Samarium Cobalt is manufactured by a sintering process, and inherent cracks are possible. Samarium Cobalt magnets can easily chip; eye protection must be worn when handling them. Samarium Cobalt alloys are typically machined in an un-magnetized state, using a wet grinding process. The grinding waste produced must not be allowed to completely dry as Samarium Cobalt has a low ignition point. A BuyMagnets.com team member can help determine if custom machining is required or if “pressed to size” option is possible. Keep Samarium Cobalt magnets away from children.