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Samarium-cobalt magnets: Disc magnets for demanding applications
Samarium-cobalt magnets (SmCo), like neodymium magnets, are rare-earth magnets. They are characterized by high energy density, strong magnetic fields, and exceptional temperature stability. They are primarily used in industry, aerospace, and medical technology.
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What are samarium-cobalt magnets?
Samarium-cobalt magnets are high-performance magnets made from a metallic alloy of samarium and cobalt.
They belong to the group of rare-earth magnets and offer exceptionally high magnetic performance in a compact design.
Compared to conventional ferrite magnets, they generate a significantly stronger magnetic field and have high coercivity. This makes them resistant to demagnetization. This combination makes them a reliable solution for long-lasting applications.
What properties do samarium-cobalt magnets have?
The unique properties of samarium-cobalt magnets make them indispensable for many industries. Key features include:
- High temperature resistance up to several hundred degrees Celsius
- Excellent corrosion resistance, even without additional coating
- Very high coercivity for stable magnetization
- Good energy density in a compact design
- Durability and consistent magnetic properties over long periods
These advantages ensure that SmCo magnets function reliably even under extreme conditions.
Why are samarium-cobalt magnets temperature-resistant?
The exceptional temperature resistance of SmCo magnets is due to their special manufacturing process and material structure. The samarium-cobalt alloy used has a stable crystal structure that retains its magnetic properties even at high temperatures. The magnets are manufactured in two alloys:
- SmCo5: 36 % samarium content
- Sm2Co17: 25 % samarium content and up to 18 % iron and up to 12 % copper
While many other types of magnets lose performance when heated, the magnetic field of samarium magnets remains largely constant.
This makes them ideal for applications in motors, sensors, or industrial equipment where high temperatures occur.
What types of samarium-cobalt magnets are there?
Samarium-cobalt magnets are available in various types, differing in composition and performance. The most common types are:
- SmCo5: good corrosion resistance even without coating, temperature resistance up to approx. 250 °C
- Sm2Co17: higher energy density and higher temperature resistance up to approx. 350 °C
At magnet-shop.com, you can purchase samarium-cobalt magnets in the form of disc magnets. This compact design is suitable for a wide range of industrial and technical applications. Benefit from durable, high-performance products of tested quality and find the right magnet for your project.