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What are the differences between neodymium iron boron permanent magnets and samarium cobalt?
Time： 2023-03-17
Differences between neodymium iron boron permanent magnets and samarium cobalt - magnetic aspects
Neodymium iron boron magnets are known as the "magnetic king" in the industry, and the magnetic properties of samarium cobalt magnets are second to neodymium iron boron.
Difference between neodymium iron boron permanent magnets and samarium cobalt - temperature resistance
Neodymium iron boron high-temperature 220 ° C materials require a temperature of 28AH or above to reach 220 ° C, while samarium cobalt high-temperature resistant magnets are 350 ° C higher but require Sm2Co17 materials to achieve it.
Differences between neodymium iron boron permanent magnets and samarium cobalt in terms of stability
The temperature coefficient of neodymium iron boron remanence is relatively large, and the higher the temperature rises, the lower the remanence; The remanence temperature coefficient of samarium cobalt is very low, and at the same temperature, the demagnetization of samarium cobalt is much less than that of neodymium iron boron. In addition, neodymium iron boron needs to be electroplated, otherwise it is easy to be oxidized, corroded, and weathered away. Samarium cobalt generally does not require electroplating, but if the usage environment is harsh, the service life after electroplating is longer and more beautiful.
Differences between neodymium iron boron permanent magnets and samarium cobalt in terms of value
The proportion of neodymium and boron in neodymium magnet earth elements is relatively small, so their value is relatively cheap; Samarium and cobalt are more common elements in samarium cobalt magnets, with around 70% being samarium and cobalt, making them relatively valuable.
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Processing and Hazards of Samarium Cobalt Magnets
Production process of samarium cobalt magnets: Ingredients → melting and ingot making → powder making → pressing → sintering and tempering → magnetic testing → grinding processing → pin cutting processing → finished product. These alloys are usually processed in a non magnetized state. Samarium cobalt is finely ground using wet grinding (water-cooled heat dissipation) and diamond grinding wheels.
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