What are High Temperature Samarium Cobalt Permanent Magnets?

What are Samarium Cobalt Magnets?

As part of the rare earth group of permanent magnets, samarium cobalt – SmCo magnets typically fall into two families of materials. They include rare earth SmCo5 and Sm2Co17 and are referred to as 1:5 and 2:17 materials.

smco magnets

There are three types of SmCo magnets according to different manufacturing processes: sintered magnet, bonded magnet, and injection molded magnet.

SmCo magnet is a high-performance, low-temperature coefficient, and is mainly made of samarium and cobalt, and other rare-earth elements. Its biggest advantage is its high working temperature of up to 300 °C. It does not need to be coated because it is difficult to erode and oxidized, thus it is widely used in motors, watches, transducers, instruments, positional detectors, generators, radars, etc.


Typical Physical Properties of Samarium Cobalt Permanent Magnets

What are the types of High-Temperature Samarium Cobalt Permanent Magnets?

High-Temperature Samarium Cobalt Permanent Magnets could be classified into Sintered SmCo Magnet, Bonded SmCo Magnet, and Injection molding SmCo Magnets.


Sintered SmCo Magnet

  1. The most excellent temperature characteristics in the Rare Earth magnet family since the mid-1960s
  2. Manufactured by a powder metallurgical process that involves the sintering of powder under a vacuum. As part of the rare earth group of magnets, SmCo magnets typically fall into two families of materials. They include SmCo5 and Sm2Co17, and commonly referred to as 1:5 and 2:17 materials
  3. Good corrosion resistance and no special surface treatment is required, which makes SmCo an excellent choice for compact designs where high-temperature environments may be present
  4. Grinding and slicing can be operated into the desired shape and size

Bonded SmCo Magnet

  1. Being manufactured using both injection and compression molding techniques, particularly suitable for high-volume production of a wide variety of shapes and size ranges.
  2. Rare-Earth Samarium Cobalt 5 and Rare-Earth Samarium 2 Cobalt 17, two different types of powders are applied to production to be varied to achieve the desired magnetic performance
  3. Precise dimensional control is achieved in both processes and usually, the component does not require further machining
  4. Due to excellent corrosion resistance, the coating is not recommended for products

Injection molding SmCo Magnets

  1. Flexible in shape
  2. Precise in size
  3. Good at consistency
  4. Recombination compaction
  5. Flexible in magnetization orientation
  6. High mechanical strength


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