Description Of Super Permanent Strong Samarium Cobalt Magnets
Samarium Cobalt SmCo is the alternative Rare Earth magnet. It is often used in aerospace, automotive and military applications. It is usually weaker than NdFeB Neodymium at room temperature. Samarium Cobalt SmCo is capable of use in extremes of cold and heat. It also has very high coercivity making it ideal for high-temperature motor applications.
Samarium Cobalt (SmCo) magnets are powerful magnets rare earth magnets composed of samarium and cobalt. They are commonly used in high-performance motors, magnetic couplings, and magnetic separators. These are brittle magnets and are prone to cracking and chipping. Samarium magnets can be used for high-temperature applications where neodymium will not work.
Super Permanent Strong Samarium Cobalt Magnets
There are two compositions of magnets in this family: Sm1Co5 and Sm2Co17. The highest commercially available energy products of Sm2Co17 are in the 30MGOe range. Samarium Cobalt SmCo magnets exist in two alloy varieties. Sm1Co5 (SmCo1:5) is the original SmCo alloy. Sm2Co17 (SmCo2:17) is the more common used and stronger SmCo alloy with SmCo26 being the most popular variety. Sm1Co5 contains mainly Sm and Co and contains no iron (Fe) so it has excellent corrosion resistance. Sm2Co17 is mainly Sm and Co but also contains Cu, Hf &/or Zr, sometimes Pr, and Fe. The low free iron content in Sm2Co17 means it is technically prone to a little surface corrosion when in water. Sm2Co17 is regarded as having good to very good corrosion resistance (far superior to NdFeB) in most applications.
Physical Feature Of Super Permanent Strong Samarium Cobalt Magnets
Sintered Smco Physical Feature | |||
Parameter Name | Unit | SmCo 1:5 | SmCo 2:17 |
Density | G/cm3 | 8.3 | 8.4 |
Curie Temperature Tc | K | 1000 | 1100 |
Vickers Hardness Hv | MPa | 450-500 | 550-600 |
Compressive Strength | MPa | 1000 | 800 |
Electrical Resistivity ρ | Ω.cm | 5~6×10-5 | 8~9×10-5 |
Bending Strength | Mpa | 150-180 | 130-150 |
Tensile Strength | Mpa | 400 | 350 |
Thermal Expansion Coefficient | (10-6/℃) | 6⊥12 | 8⊥11 |
Magnetic field strength H(min) of Super Permanent Strong Samarium Cobalt Magnets
Materials | SmCo1:5 | SmCo1:5 | SmCo2:17 | SmCo2:17 | Ce(co,Fe,cu)5 |
Hcj Scope | HCj≥1194 | HCj ≤ 1433 | HCj ≥ 1433 | HCj ≤1273 | HCj ≤800 |
Difference between Neodymium and SmCo magnets:
Comparison of NdFeB and SmCo Magnets | ||
Property | Neodymium | SmCo |
Remanence (T) | 1–1.3 | 0.82–1.16 |
Coercivity (MA/m) | 0.875–1.99 | 0.493–1.59 |
Relative permeability | 1.05 | 1.05 |
Temperature coefficient of remanence (%/K) | −0.12 | −0.03 |
Temperature coefficient of coercivity (%/K) | −0.55..–0.65 | −0.15..–0.30 |
Curie temperature (°C) | 320 | 800 |
Density (g/cm3) | 7.3–7.5 | 8.2–8.4 |
CTE, magnetizing direction (1/K) | 5.2×10−6 | 5.2×10−6 |
CTE, normal to magnetizing direction (1/K) | −0.8×10−6 | 11×10−6 |
Flexural strength (N/mm2) | 250 | 150 |
Compressive strength (N/mm2) | 1100 | 800 |
Tensile strength (N/mm2) | 75 | 35 |
Vickers hardness (HV) | 550–650 | 500–650 |
Electrical resistivity (Ω·cm) | (110–170)×10−6 | 86×10−6 |
Advantages of Samarium Cobalt Magnets
Can be used in extremely cold conditions (e.g. to a few Kelvin above absolute zero).
SmCo can be used up to +300 degrees C (572F); the H-rated versions up to +350 degrees C (662F).
High coercivity (Hci) to resist demagnetization.
Above +150 to +180 degrees C (302-356F) the SmCo magnet starts to offer more performance than NdFeB magnet grades.
SmCo is regarded as being corrosion resistant.
Very low field strength changes with varying temperatures.
Super Permanent Strong Samarium Cobalt Magnets Size Range:
Samarium Cobalt Magnet Grades of SmCo 5(Sintered SmCo Magnet)
Samarium Cobalt Magnet Grades of SmCo 17(Sintered SmCo Magnet)
Certificates of SmCo5 and Sm2Co17 Samarium Cobalt Magnets:
Customers And Applications:
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