SmCo Magnet(Samarium-cobalt magnet) is a type of strong permanent magnet made of an alloy of samarium and cobalt. They are generally ranked similarly in strength to neodymium magnet, but have higher temperature ratings and higher coercivity.
- Higher coercivity than Neodymium Magnet- Extremely resistant to demagnetization
- Good temperature stability (maximum use temperatures between 250 °C (523 K) and 550 °C (823 K); Curie temperatures from 700 °C (973 K) to 800 °C (1,070 K)
- Very brittle, easy to chip in all magnetic materials. Eays to have inherent cracks that do not have mechanical integrity.
- Much expensive than other magnetic materials.
- SmCO magnets have two series: SmCo5,Sm2Co17
Applications
Holding systems requiring very high holding forces, high field yoke magnets, high performance stepper, DC motors, servo motors, linear motors, voice coil motors, magnetic bearings, magnetic couplings, loudspeakers, Halbach arrays, headphones, microphones, magnetic separation, instrumentation, switches, relays, magnetic resonance, sputtering, vacuum deposition, charged particle beam guidance, particle accelerators, Undulators, Wigglers, Traveling wave tubes, Computer rigid disc drives, Sensors, Various automotive applications
Typical Magnetic Properties
| Grade | Br | Hcb | Hcj | (BH)max | Density | TW Max | Series |
|---|---|---|---|---|---|---|---|
| The effective Maximum Operating Temperature for a Samarium Cobalt Magnet is a function of the magnet’s magnetic characteristics and the geometry of the system (the magnet and the circuit). The listing maximum operating temperature is a recommendation and infers and ideal geometry and no external demagnetizing fields. Please engage Jack to review the application before selecting a particular grade. | |||||||
| kGs(mT) | kOe(kA/m) | kOe(kA/m) | MGOe(kJ/M3) | g/cm3 | ℃ | ||
| SmCo16 | 8.3(830) | 8.0(640) | 18.0(1430) | 16.0(128) | 8.3 | 250 | 1:5 |
| SmCo18 | 8.8(880) | 8.5(680) | 18.0(1430) | 18.0(144) | 8.3 | 250 | |
| SmCo20 | 9.2(920) | 8.7(700) | 18.0(1430) | 20.0(160) | 8.3 | 250 | |
| SmCo22 | 9.4(940) | 9.1(730) | 18.5(1450) | 22.0(176) | 8.3 | 250 | |
| SmCo24 | 9.8(980) | 9.4(750) | 18.5(1450) | 24.0(192) | 8.3 | 250 | |
| SmCo24 | 9.8(980) | 9.1(730) | 18.5(1450) | 24.0(192) | 8.4 | 300 | 2:17 |
| SmCo26 | 10.3(1030) | 9.5(760) | 18.5(1450) | 26.0(208) | 8.4 | 300 | |
| SmCo28 | 10.5(1050) | 9.7(780) | 18.5(1450) | 28.0(224) | 8.4 | 300 | |
| SmCo30 | 11.0(1100) | 10.1(810) | 18.5(1450) | 30.0(240) | 8.4 | 300 | |
| SmCo26M | 10.3(1030) | 9.5(760) | 15.0(1100) | 26.0(208) | 8.4 | 300 | |
| SmCo28M | 10.5(1050) | 9.7(780) | 15.0(1100) | 28.0(224) | 8.4 | 300 | |
| SmCo30M | 11.0(1100) | 10.1(810) | 15.0(1100) | 30.0(240) | 8.4 | 300 | |
| SmCo28L | 10.5(1050) | 6.9(550) | 8.0(700) | 28.0(224) | 8.4 | 250 | |
| SmCo30L | 11.0(1100) | 6.9(550) | 8.0(700) | 30.0(240) | 8.4 | 250 | |
| SmCo24H | 10.0(1000) | 9.0(720) | 25.0(2000) | 24.0(192) | 8.4 | 350 | |
| SmCo26H | 10.3(1030) | 9.5(760) | 25.0(2000) | 26.0(208) | 8.4 | 350 | |
| SmCo28H | 10.5(1050) | 9.6(770) | 25.0(2000) | 28.0(224) | 8.4 | 350 | |
| SmCo30H | 10.8(1080) | 10.1(810) | 25.0(2000) | 30.0(240) | 8.4 | 350 | |
| Property | Unit | Values SmCo (1-5) | Values SmCo (2-17) |
|---|---|---|---|
| The listed values are approximate and should be used as a reference. Any magnetic or physical characteristics should be substantiated before selecting a magnet material. | |||
| Vickers Hardness | Hv | 450 – 550 | 500 – 600 |
| Density | g/cm3 | 8.3 | 8.4 |
| Curie Temp Tc | °C | 700 – 750 | 800 – 850 |
| Curie Temp Tf | °F | 1,292 – 1,382 | 1,472 – 1,562 |
| Specific Resistance | μΩ·Cm | 53 | 86 |
| Bending Strength | Mpa | 1.8 x 108 | 1.5 x 108 |
| Compressive Strength | Mpa | 10 x 108 | 8 x 108 |
| Thermal Expansion Parallel (∥) to Orientation (M) | °C-1 | 6 x 10-6 | 8 x 10-6 |
| Thermal Expansion Perpendicular (⊥) to Orientation (M) | °C-1 | 13 x 10-6 | 11 x 10-6 |
| Young’s Modulus | kg/mm2 | 1.6 x 104 | 1.2 x 104 |
| Temperature Range (°C) | Induction Br (α) SmCo 1-5 (%)/°C | Induction Br (α) SmCo 2-17 (%)/°C |
|---|---|---|
| α = Δ Br / Δ T * 100 (Br @ 20°C) [ΔT = Relevant ranges listed above.] | ||
| -100°C to 20°C | -0.045 | -0.030 |
| 20°C to 100°C | -0.045 | -0.030 |
| 100°C to 200°C | -0.050 | -0.035 |
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