Samarium–cobalt magnet is a kind of Rare earth magnet. It is a kind of magnetic material made of samarium, cobalt and other metal rare earth materials through proportioning, melting into alloy, crushing, molding and sintering. It has high magnetic energy product and extremely low temperature coefficient. The maximum operating temperature can reach 350 ℃. Negative temperature is unlimited. When the operating temperature is above 180 ℃, its maximum magnetic energy product (BHmax) The coercivity, temperature stability, and chemical stability all exceed those of neodymium iron boron permanent magnet materials.
Samarium Cobalt(SmCo5) Magnet Grade
| Material | Grade | Br | Hcb | Hcj | (BH)max | Tw | α(Br) | α(Br) | ||||
| T | KGS | KA/m | kOe | KA/m | kOe | kJ/m³ | MGOe | C | %/。C | %/。C | ||
| SmCo5 | 6 | 0.50-0.58 | 5.0-5.8 | 374-454 | 4.7-5.7 | ≥1194 | ≥15 | 48-64 | 6-8 | 250 | -0.050 | -0.30 |
| 8 | 0.58-0.65 | 5.8-6.5 | 430-509 | 5.4-6.4 | ≥1194 | ≥15 | 64-80 | 8-10 | 250 | -0.050 | -0.30 | |
| 10 | 0.64-0.72 | 6.4-7.2 | 478-565 | 6.0-7.1 | ≥1194 | ≥15 | 80-96 | 10-12 | 250 | -0.050 | -0.30 | |
| 12 | 0.70-0.76 | 7.0-7.6 | 517-589 | 6.5-7.4 | ≥1194 | ≥15 | 96-111 | 12-14 | 250 | -0.050 | -0.30 | |
| 14 | 0.75-0.82 | 7.5-8.2 | 557-637 | 7.0-8.0 | ≥1194 | ≥15 | 111-127 | 14-16 | 250 | -0.050 | -0.30 | |
| 16 | 0.77-0.86 | 7.7-8.6 | 573-668 | 7.2-8.4 | ≥1194 | ≥15 | 119-143 | 15-18 | 250 | -0.050 | -0.30 | |
| 18 | 0.82-0.90 | 8.2-9.0 | 621-700 | 7.8-8.8 | ≥1194 | ≥15 | 127-159 | 16-20 | 250 | -0.050 | -0.30 | |
| 20 | 0.86-0.92 | 8.6-9.2 | 653-716 | 8.2-9.0 | ≥1194 | ≥15 | 143-175 | 18-22 | 250 | -0.050 | -0.30 | |
| 22 | 0.90-0.95 | 9.0-9.5 | 677-740 | 8.5-9.3 | ≥1194 | ≥15 | 159-183 | 20-23 | 250 | -0.050 | -0.30 | |
| 24 | 0.95-1.00 | 9.5-10.0 | 716-780 | 9.0-9.8 | ≥1194 | ≥15 | 175-183 | 22-23 | 250 | -0.050 | -0.30 | |
| 16S | 0.79-0.84 | 7.9-8.4 | 612-660 | 7.7-8.3 | ≥1830 | ≥23 | 118-135 | 15-17 | 250 | -0.035 | -0.28 | |
| 18S | 0.84-0.90 | 8.4-9.0 | 644-692 | 8. 1-8.7 | ≥1830 | ≥23 | 135-151 | 17-19 | 250 | -0.040 | -0.28 | |
| 20S | 0.90-0.94 | 9.0-9.4 | 684-732 | 8.6-9.2 | ≥1830 | ≥23 | 151-167 | 19-21 | 250 | -0.045 | -0.28 | |
| 22S | 0.92-0.96 | 9.2-9.6 | 710-756 | 8.9-9.5 | ≥1830 | ≥23 | 167-183 | 21-23 | 250 | -0.045 | -0.28 | |
| 24S | 0.96-1.00 | 9.6-10.0 | 740-788 | 9.3-9.9 | ≥1830 | ≥23 | 183-199 | 23-25 | 250 | -0.045 | -0.28 | |
Samarium Cobalt(SmCo) Physical Properties
| Grade | SmCo5(RECo5) | Sm2Co17(RE2Co17) |
| Temperature Coefficient of Remanence(Br) | -0.05%/C | -0.03%/C |
| CurieTemperature | 750C | 800C |
| Density | 8.2-8.4g/cm³ | 8.3-8.5g/cm³ |
| Vickers Hardness | 450-500Hv | 500-600Hv |
| Max.Operating Temperature | 250C | 300-350C |
Comparison of Physical Properties- SmCo
| Material | SmCo |
| Remanence | 0.82-1. 16T |
| Coercivity | 0.493-1.99MA/m |
| Relative Permeability | 1.05 |
| Temperature Coefficient of Remanence(Br) | -0.03%/C |
| Temperature Coefficient of Coercivity(Hcj) | -0. 15~-0.30%/C |
| CurieTemperature | 750-800C |
| Density | 8.2-8.4g/cm³ |
| CTE,Magnetizing Direction | 5.2x10-6%/K |
| Flexural Strength | 150N/mm² |
| Compressive Strength | 800N/mm² |
| Tensile Strength | 35N/mm² |
| Vickers Hardness | 500-550Hv |
| Electrical Resistivity | 86x10-6Ω .cm |
