Minerals & Metallurgy

Sm2Co17 MagnetsSmCo2:17 magnet (Sm2Co17) is mainly prorated with metallic samarium, cobalt, Copper, iron and zirconium. The (BH) max range is from 20 to 32, maximum working temperature 350°C. Sm2Co17 bears extremely low temperature coefficient and preferably anti-causticity. When working in?high-temperature environment, magnetic properties of SmCo magnet is better than NdFeB magnet.?Thus,?SmCo magnets are?widely used in fields such as aeronautics and space, national defense and sensors. Because of?great brittleness of Sm2Co17 materials, it is not suitable for complex shapes and disc or ring with thin thickness.?Also due to this character, there may be some appearance defects such as small chips during production, inspection and magnetizing process. However, magnetic?property?will not be affected.A samarium–cobalt (SmCo) magnet, a type of rare earth magnet, is a strong permanent magnet made of an alloy of samarium and cobalt. They were developed in the early 1970s, by Albert Gale and Dr. Daas, of Raytheon Corporation. They are generally ranked similarly in strength to neodymium magnets, but have higher temperature ratings and higher coercivity. They are brittle, and prone to cracking and chipping. Samarium–cobalt magnets have maximum energy products (BHmax) that range from 16 megagauss-oersteds (MGOe) to 33 MGOe, that is approx. 128 kJ/m3 to 264 kJ/m3; their theoretical limit is 34 MGOe, about 272 kJ/m3.Attributes-Extremely resistant to demagnetization- Good temperature stability (maximum use temperatures between 250 °C (523 K) and 550 °C (823 K); Curie temperatures from 700 °C (973 K) to 800 °C (1,070 K)- Expensive and subject to price fluctuations (cobalt is market price sensitive)Physical and mechanical propertiesComparison of physical properties of sintered neodymium and Sm-Co magnetsPropertyNeodymiumSm-CoRemanence?(T)1–1.30.82–1.16Coercivity?(MA/m)0.875–1.990.493–1.59Relative permeability1.051.05Temperature coefficient of remanence (%/K)?0.12?0.03Temperature coe