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中文简体SmCo5 magnets are the first generation of samarium cobalt magnets. The numbers in the grade designation refer to the ratio of samarium to cobalt in the magnet composition. The 1:5 grades have one samarium atom coupled with five cobalt atoms. They contain approximately 15-25% samarium, 5-7% cobalt, and small amounts of other rare earth metals such as praseodymium and neodymium. Such magnets have a maximum energy product (BH)max of around 26-30 MGOe (mega gauss-oersteds). They are suitable for use in high-temperature applications up to 350°C, while their curie temperature is about 500°C.
Additionally, the 1:5 series excels at better corrosion resistance and machinability because such samarium cobalt magnets do not possess any iron. Meanwhile, Sm2Co17 magnets might have few iron contents, so extra corrosion protection is required.
