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The 1:5 samarium cobalt magnets, also known as SmCo₅, are made from a combination of rare earth metals such as samarium, cobalt, gadolinium, and praseodymium. Magnetstek Engineering supplies custom SmCo5 magnets.
The 1:5 samarium cobalt magnets offer a maximum magnetic energy range of 10-25 and can withstand temperatures up to 250℃. Meanwhile, the total magnetic energy product is lower than that of 2:17 samarium cobalt magnets. Moreover, the mechanical properties and flexibility are superior. This makes it easier to machine into complex shapes such as thin disks, squares, rings, and custom shapes.
| Grade | Remanence/Br. | Coercivity Force/HcB. | Intrinsic Coercivity/HcJ. | Maximun Energy/(BH)max | Curie Temperature | Max. Operating Temperature | Temperature Coefficient of Br α(Br) | Temperature Coefficient of Hcj β(Hcj) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| T | KGs | KA/m | KOe | KA/m | KOe | KJ/m3 | MGOe | ℃ | ℃ | ％/℃ | ％/℃ | |
| YX-16s | 0.79-0.84 | 7.9-8.4 | 620-660 | 7.8-8.3 | ≥1830 | ≥23 | 118-135 | 15-17 | 750 | 250 | -0.035 | -0.28 |
| YX-18s | 0.84-0.89 | 8.4-8.9 | 660-700 | 8.3-8.8 | ≥1830 | ≥23 | 135-151 | 17-19 | 750 | 250 | -0.04 | -0.28 |
| YX-20s | 0.89-0.93 | 8.9-9.3 | 684-732 | 8.6-9.2 | ≥1830 | ≥23 | 150-167 | 19-21 | 750 | 250 | -0.045 | -0.28 |
| YX-22s | 0.92-0.96 | 9.2-9.6 | 710-756 | 8.9-9.5 | ≥1830 | ≥23 | 167-183 | 21-23 | 750 | 250 | -0.045 | -0.28 |
| YX-24s | 0.96-1.00 | 9.6-10.0 | 740-788 | 9.3-9.9 | ≥1830 | ≥23 | 183-199 | 23-25 | 750 | 250 | -0.045 | -0.28 |
| LTC (YX-10) (SmGd)Co5 | 0.62-0.66 | 6.2-6.6 | 485-517 | 6.1-6.5 | ≥1830 | ≥23 | 75-88 | 9.5-11 | 750 | 300 | Temp. Range 20-100℃ 100-200℃ 200-300℃ | α(Br) +0.0156+0.0087 +0.0007 |
| The temperature coefficients of remanence Br and intrinsic coercivity Hcj are measured at 20°C to 150°C, only for reference. | ||||||||||||
| Theoretical calculation formula (T1 = room temperature (usually 20℃), T2=high temperature): | ||||||||||||
| Br@T2=Br@T1-[(T2-T1)*α(Br)*Br@T1] | ||||||||||||
| Hcj@T2=Hcj@T1-[(T2-T1)*β(Hcj)*Hcj@T1] | ||||||||||||
| Taking YX-20s，Br=0.9T, Hcj=1830KA/m as an example, the theoretical value at 150℃ is calculated as follows: | ||||||||||||
| Br@150℃=0.9-[(150-20)*0.045%*0.9]=0.8473T | ||||||||||||
| Hcj@150℃=1830-[(150-20)*0.28%*1830]=1163.88KA/m | ||||||||||||
| Sm₁Co₅ | Unit | SmCo5 Magnet |
|---|---|---|
| Density (D) | G/Cm3 | 8.3 |
| Curie Temperature (Tc) | K | 1000 |
| Vickers Hardness (Hv) | MPa | 450-500 |
| Compressive Strength (δc) | MPa | 1000 |
| Resistivity (ρ) | Ω.Cm | 5～6×10⁻⁵ |
| Bending Strength (δb) | Mpa | 150-180 |
| Tensile Strength (δt) | Mpa | 40 |
| Coeff. of Thermal Expansion (α) | (10⁻⁶/℃) | ∥ 6 |
