Samarium Cobalt Magnets

Samarium Cobalt ( SmCo ) Magnets - Samarium cobalt magnets (SmCo)

Samarium Cobalt magnets are a rare earth magnet material that offers the best value when comparing performance and size in high temperature or adverse environments. Samarium Cobalt magnets are higher in cost, but magnetically very strong and typically allow for dimensional reductions. A Samarium Cobalt rare earth magnet will offer excellent corrosion resistance and typically will not require a surface treatment. No magnet material should be employed as a structural element in a design. Samarium Cobalt magnets are especially prone to fracturing and are very weak under tensile or compressive loads. Samarium Cobalt magnets have good resistance to external demagnetizing fields because of their high Intrinsic Coercive Force (Hci) . This resistance makes Samarium Cobalt rare earth magnets an excellent choice for electro-mechanical applications.

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. There are three types of SmCo magnets according to different manufacturing processes: sintered magnet, bonded magnet, and injection molded magnet. SmCo magnet is high performance, low temperature coefficient, and mainly made of samarium and cobalt and other rare-earth elements. Its biggest advantage is high working temperature upto 300 ℃. It does not need to be coated because it is difficult to be eroded and oxidized.

Advantages

• High heat resistance.
• Curie point 780 - 860 ℃
• Temperature coefficient of residual magnetic flux density -0.036% /°C.
• Samarium Cobalt rare earth magnets are very resistant to corrosion and do not normally require any surface treatment.

Main application

• Magnet couplings.
• Electric motors.
• Magnets for sputtering equipment.
• Actuators.
• Automobile magnets (Antilock brake system (ABS), ignition magnets, etc.).
• Assembly parts, magnetic circuit design.
• Magnetization system (Magnetization power source design, Magnetization yoke design and manufacturing).

Samarium Cobalt Magnetizing

Samarium cobalt magnet can be magnetized in any direction as long as it is aligned properly.

oriented through thickness	axially oriented	axially oriented in segments
oriented laterally multipole on one face	multipole oriented in segments on outside diameter*	multipole oriented in segments on one face
radially oriented *	oriented through diameter *	multipole oriented in segments on inside diameter*
radially oriented	diametrically oriented	all available as isotropic or anisotropic material * only available in isotropic and certain anisotropic materials only

Samarium Cobalt Corrosion Characteristics (Surface Treatment)

Samarium Cobalt rare earth magnets are very resistant to corrosion and do not normally require any surface treatment.

The various elements that compose a samarium cobalt magnet -samarium (Sm), cobalt (Co), copper (Cu), zirconium (Zr), and iron (Fe).