Samarium cobalt magnets (also known as SmCo magnets): one of the two types of rare earth magnets is a strong permanent magnet made of an alloy of samarium and cobalt. They were developed in the early 1970s. They are generally the second-strongest type of magnet made, less strong than neodymium magnets, but have higher temperature ratings. They are expensive, brittle, and prone to cracking and chipping. Samarium-cobalt magnets have maximum energy products (BHmax) that range from 16 megagauss-oersteds (MGOe) to 32 MGOe; their theoretical limit is 34 MGOe. They are available in two ''series'', namely Series 1:5 and Series 2:17.
Samarium Cobalt Magnets (SmCo) magnets feature excellent temperature stability while retaining their magnetic properties under extreme temperature conditions. Thus, they are very suitable for applications involving high or extremely low temperatures.
SmCo magnets have high coercivity (Hci) to resist demagnetization.
SmCo magnets have good corrosion resistance. Sm1Co5 does not rust because it does not contain iron. However, Sm2Co17 should be coated with a protective coating in very wet conditions to minimize the risk of surface corrosion. However, Sm1Co5 does not rust because it does not contain iron.
SMCO magnets can be used at a higher temperature than NdFeB magnets, up to 300 degrees Celsius or more.
Above 180 degrees Celsius, SmCo magnets start to provide higher performance than NdFeB magnets.
Samarium Cobalt has good corrosion resistance and generally does not require surface treatment, while NdFeB is easy to be corroded.
The general price of samarium cobalt magnets is higher than NdFeB magnets.
Among all magnets, samarium cobalt magnets are the most brittle one.
Corrosion-resistant round, cylindrical samarium cobalt magnets.
Circular shaped samarium cobalt magnets for a variety of applications.
Highly powerful block and square shaped samarium cobalt magnets.
The maximum operating temperature of SmCo magnets is between 250 and 550°C and they have a Curie temperature range of 700 to 800°C.
SmCo magnets are widely used in the military, wind energy, semiconductor, petroleum, manufacturing, aerospace, medical, automotive, electric power, and energy industries, such as high-performance motors, generators, turbo machinery, electric motors, magnetic separation devices, sensor systems, wind turbine equipment, medical devices, magnetic drive components and more.
As the Samarium Cobalt magnets have better corrosion resistance, the products do not need surface treatments in general. However, some customers need to use Samarium Cobalt magnets as appearance parts, or the application environment of the product is harsh, the product will be required to be plated.
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