SmCo magnet
SmCo magnet
Samarium Cobalt Magnets: The Ultimate Solution for Extreme Environments
What are SmCo Magnets?
SmCo magnets, composed of Samarium (Sm) and Cobalt (Co), are rare earth magnets renowned for:
✅ Unmatched thermal stability (-270°C to 350°C operating range)
✅ Intrinsic corrosion resistance (No coating required)
✅ Demagnetization resistance (<0.1% flux loss per decade)
With energy products up to 33 MGOe, SmCo magnets power mission-critical systems where failure is not an option.
Five Competitive Edges of Our SmCo Magnets:
1. Military-Grade Durability
Radiation-resistant grades for satellite components
Vibration-proof up to 15G acceleration
2. Zero Maintenance Design
Natural oxidation resistance
IP67 waterproof standard
3. Precision Manufacturing
±0.01mm tolerance for medical imaging devices
Isostatic pressing technology
SmCo vs. NdFeB: When to Choose Which?
Parameter SmCo NdFeB
Max Operating Temp 350°C 230°C
Corrosion Resistance Intrinsic Requires Coating
Ideal For Aerospace, Downhole Drilling EVs, Consumer Electronics
Critical Applications in Harsh Conditions:
1. Aerospace Systems
Actuators in jet engines (Boeing 787 uses 120+ SmCo magnets)
Gyroscopes for spacecraft orientation
2. Medical Technology
MRI scanner magnetic assemblies
Surgical robot joints
3. Energy Infrastructure
Downhole drilling sensors (Withstand 200MPa pressure)
Nuclear reactor control rods
FAQ Section:
Q: Can SmCo magnets work in space vacuum?
A: Yes! Our Sm2Co17 grades maintain performance at 10^-6 Torr pressure.
Q: Do you provide radiation shielding options?
A: We offer boron-embedded SmCo for nuclear applications (Neutron absorption cross-section 760 barns).
Physical & Mechanical Properties of Sintered SmCo
Material | Sm2Co17 | SmCo5 |
Physical Properties | ||
Curie temperature | 800~850℃ | 700~750℃ |
Thermal expansion coefficient (//) | 8×10-6/℃ | 6×10-6/℃ |
Thermal expansion coefficient (⊥) | 11×10-6/℃ | 13×10-6/℃ |
Thermal coefficient | 10Kcal/mhr℃ | 11Kcal/mhr℃ |
Specific heat | 8×10-2Cal/g℃ | 9×10-2Cal/g℃ |
Resistivity | 8.6×10-5Ω-cm | 5.3×10-5Ω-cm |
Mechanical Properties | ||
Bending strength | 15Kg/mm2 | 18Kg/mm2 |
Compressive strength | 82Kg/mm2 | 102Kg/mm2 |
Tensile strength | 3.6Kg/mm2 | 4.1Kg/mm2 |
Young's modulus | 1.2×104Kg/mm2 | 1.6×104Kg/mm2 |
Vickers Hardness | 500~600Hv | 450~500Hv |
Typical magnetic properties of SmCo magnets
系列 | 牌号 | 剩磁Br ( 20°C) | 矫顽力(Hcb) | 内禀矫顽力(Hcj) | 最大磁能积 | 密度 | 最大工作温度 | ||||
T | KGs | KA/m | KOe | KA/m | KOe | KJ/m3 | MGOe | g/cm3 | °C | ||
钐钴1:5 | XG18 | 0.84-0.89 | 8.4-8.9 | ≥661 | ≥8.3 | ≥1751 | ≥22.0 | 135-151 | 17-19 | 8.1-8.3 | 250 |
XG20 | 0.89-0.93 | 8.9-9.3 | ≥685 | ≥8.6 | ≥1751 | ≥22.0 | 151-167 | 19-21 | 8.1-8.3 | 250 | |
XG22 | 0.92-0.96 | 9.2-9.6 | ≥708 | ≥8.9 | ≥1751 | ≥22.0 | 167-183 | 21-23 | 8.1-8.3 | 250 | |
XG24 | 0.96-1.00 | 9.6-10.0 | ≥740 | ≥9.3 | ≥1751 | ≥22.0 | 183-199 | 23-25 | 8.1-8.3 | 250 | |
钐钴2:17 | XGS26 | 1.02-1.05 | 10.2-10.5 | ≥748 | ≥9.4 | ≥1433 | ≥18.0 | 191-207 | 24-26 | 8.2-8.4 | 300 |
XGS28 | 1.03-1.08 | 10.3-10.8 | ≥756 | ≥9.5 | ≥1433 | ≥18.0 | 207-223 | 26-28 | 8.2-8.4 | 300 | |
XGS30 | 1.08-1.10 | 10.8-11.0 | ≥788 | ≥9.9 | ≥1433 | ≥18.0 | 223-239 | 28-320 | 8.2-8.4 | 300 | |
XGS32 | 1.10-1.13 | 11.0-11.3 | ≥812 | ≥10.2 | ≥1433 | ≥18.0 | 231-255 | 29-32 | 8.2-8.4 | 300 | |
XGS33 | 1.12-1.16 | 11.2-11.6 | ≥845 | ≥10.6 | ≥1433 | ≥18.0 | 239-263 | 30-33 | 8.2-8.4 | 300 | |
XGS26H | 1.02-1.05 | 10.2-10.5 | ≥748 | ≥9.4 | ≥1990 | ≥25.0 | 191-207 | 24-26 | 8.3-8.5 | 350 | |
XGS28H | 1.03-1.08 | 10.3-10.8 | ≥756 | ≥9.5 | ≥1990 | ≥25.0 | 207-223 | 26-28 | 8.3-8.5 | 350 | |
XGS30H | 1.08-1.10 | 10.8-11.0 | ≥788 | ≥9.9 | ≥1990 | ≥25.0 | 223-239 | 28-30 | 8.3-8.5 | 350 | |
XGS32H | 1.10-1.13 | 11.0-11.3 | ≥812 | ≥10.2 | ≥1990 | ≥25.0 | 231-255 | 29-32 | 8.3-8.5 | 350 | |
XGS-33H | 1.12-1.16 | 11.2-11.6 | ≥845 | ≥10.6 | ≥1990 | ≥25.0 | 239-263 | 30-33 | 8.3-8.5 | 350 | |
Remark:
What we list herein are only typical grades of SmCo magnets. We also could manufacture various magnetic properties according to the customer’s requirements.
Reference points for SmCo magnets:
SmCo magnets are highly prone to chipping and cracking, and specialized machining techniques are required. Press-fit assembly is not recommended because of their brittle nature. The SmCo materials are sensitive to thermal shock and hairline fractures can occur if subjected to thermal shock. Where cosmetic appearance of a magnet is important, this should be specified to us prior to ordering.
SmCo magnets are anisotropic, and can only be magnetized in the orientation direction. In general, magnetizing fields of about 35 to 45 kOe are required to saturate SmCo materials. This is not common to produce and large power supplies in conjunction with carefully designed magnetizing fixtures must be used. A special consideration must be given to this when designing complex assemblies if it is intended to magnetize after assembly.
Two types of SmCo magnets are SmCo5 and Sm2Co17. The 2-17 composition is also more corrosion resistant and more stable at very high temperature.