cylinder smco magnets

Cylinder SMCO magnets​ are high-performance permanent magnets made from samarium cobalt, designed for applications requiring stable magnetic output under high temperatures and harsh environments. Their cylindrical shape makes them especially suitable for axial installation and precision systems.

Introduced in the 1970s, samarium cobalt magnets were the first commercially available rare earth magnets. Their introduction was revolutionary, offering an energy product three times higher than any other magnet at the time. Before their development, AlNiCo magnets were the standard magnetic material. Samarium cobalt magnets remained the strongest magnets until rising production costs led to the development of neodymium magnets, which are now the most powerful magnets available.

The most commonly used grades of samarium cobalt magnets are composed of approximately 35% samarium (Sm) and 60% cobalt (Co), with small amounts of iron (Fe), copper (Cu), hafnium (Hf), zirconium (Zr), and praseodymium (Pr). Some grades are made entirely of samarium and cobalt, providing excellent corrosion resistance.

SmCo Magnets belong to the rare-earth permanent magnet series like NdFeB magnets. While they are not as powerful as neodymium magnets, they have two distinct advantages over neodymium magnets. They are in the higher temperature range and are more resistant to corrosion. And from 150 degrees Celsius, it will be better than NdFeB magnets with high temperature resistance. Usually, the maximum working temperature of ordinary NdFeB magnets is only 80 degrees Celsius. Therefore, in relatively high temperature environments or applications, samarium cobalt magnets are also a good choice.

Not only do samarium cobalt magnets excel at high temperatures, but they retain their magnetism even at temperatures below absolute dew (-273 degrees Celsius), making them popular for cryogenic applications.

Since most grades of samarium cobalt magnets contain little or no iron, which gives them excellent corrosion resistance, neodymium magnets typically contain 60-75% iron. Therefore, SmCo magnets generally do not require electroplating.

The magnetic properties

Compared with NdFeB magnets, the magnetic properties are not as good as SmCo magnets, but they are stronger than ordinary ferrites, equivalent to low-grade NdFeB magnets.

Price

The disadvantage of samarium cobalt magnets is that they are expensive compared to neodymium magnets due to the cost of producing samarium. Like other rare earth magnets, they are also very brittle and therefore best suited for applications that do not require direct impact.

Due to their properties, samarium cobalt magnets are most commonly used in applications requiring high temperature operation such as generators, pump couplings, sensors, electric motors, marine applications as well as automotive, aerospace, military, food and manufacturing.

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