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Samarium cobalt magnet, also known as SmCo magnet, is another type of permanent magnet. A big advantage of SmCo magnets is that they can operate at temperatures up to 300 degrees Centigrade. SmCo magnets are widely used in applications in which high operating temperature and high corrosion and oxidation resistance are crucial.

Samarium cobalt magnets are made of an alloy of samarium and cobalt. Their strength is similar to neodymium magnets, but SmCo magnets have better performance in retaining their magnetic strength. Therefore, SmCo magnets can function in applications that run on extremely high or low temperatures. 

Stanford Magnets specializes in manufacturing and supplying samarium cobalt magnets applied in various industrial applications. We have advanced technology, rich experience, and professional engineering technicians in this field. If you require a specific size, please contact us for a custom SmCo magnet quote.



What are Samarium Cobalt (SmCo) magnets?
Samarium Cobalt magnets are a type of rare-earth magnet made from an alloy of samarium and cobalt. They are known for their high magnetic strength, excellent temperature stability, and resistance to corrosion. They come in two main varieties: SmCo_5 (1:5 series) and Sm_2Co_17 (2:17 series), indicating the ratio of samarium to cobalt.
How do SmCo magnets compare to Neodymium (NdFeB) magnets?
While both SmCo and NdFeB magnets are considered rare-earth magnets and possess high magnetic strengths, SmCo magnets excel in high-temperature environments and have superior corrosion resistance without the need for protective coatings. Neodymium magnets are generally stronger at room temperature and are more cost-effective but have lower temperature resistance and are more prone to corrosion.
What are the main applications of SmCo magnets?
SmCo magnets are used in various applications where high magnetic strength and temperature stability are required. Common uses include aerospace and defense systems, automotive sensors and motors, medical devices, and industrial applications such as magnetic couplings and high-temperature motors.
Can SmCo magnets work under high temperature?
Yes, SmCo magnets are particularly valued for their ability to maintain magnetic properties at high temperatures, up to 300°C (572°F) for some grades. This makes them suitable for applications exposed to high thermal environments.
Are SmCo magnets corrosion-resistant?
Yes, SmCo magnets have good corrosion resistance and do not typically require any protective coating, unlike neodymium magnets, which often need to be coated to prevent corrosion.
How strong are SmCo magnets?
SmCo magnets have high magnetic strength, though not as high as the strongest neodymium magnets. Their strength is sufficient for most applications where temperature stability and corrosion resistance are also important factors.
Are there any handling concerns with SmCo magnets?
Like other rare-earth magnets, SmCo magnets are brittle and can chip or break if mishandled. They should be handled with care, especially when large magnets are involved, as they can snap together with significant force.
How are SmCo magnets made?
The manufacturing process of SmCo magnets involves melting the raw materials, casting the alloy, milling it into a powder, pressing the powder in a magnetic field, sintering, and then machining the magnet to its final dimensions. The magnets are then magnetized to achieve their full magnetic potential.
Do SmCo magnets need a protective coating?
Generally, SmCo magnets do not require a protective coating due to their inherent corrosion resistance. However, for specific applications or environments, a coating might be applied for additional protection or for aesthetic reasons.
How do I choose between a SmCo and a Neodymium magnet for my application?
The choice between SmCo and neodymium magnets depends on several factors, including the required magnetic strength, temperature conditions, exposure to corrosive elements, and budget constraints. For high-temperature applications or environments where corrosion resistance is crucial without coatings, SmCo magnets are the preferred choice. For applications requiring the highest magnetic strength at room temperature and where cost is a significant factor, neodymium magnets are more suitable.

Protocols and articles

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How Are Samarium Cobalt Magnets Made?
Common Applications of Samarium Cobalt Magnets
How Does Temperature Affect Samarium Cobalt Magnets?
What Are SmCo Magnets, and How are They Made?
Samarium Cobalt Magnet Motor vs. Neodymium Magnet Motor: A Comparative Analysis


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