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Sm₁Co₅ (samarium-cobalt 1:5) is a sintered rare-earth magnet family based on samarium and cobalt. Grade, composition and magnetic properties vary. Use the table below for preliminary comparison, then confirm the selected grade and test conditions for the part.
SmCo magnets are hard and brittle, so thin sections and complex geometries need review for chipping and machining feasibility. For a quote, share the drawing, dimensions and tolerances, magnetization direction, target field, operating temperature, environment and inspection requirements. Usable temperature depends on the grade, shape and magnetic circuit.
| 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. | ||||||||||||
| Illustrative linear estimates using the signed coefficients above (%/°C), for T1 = 20°C and T2 within 20–150°C. Verify the proposed grade and working point: | ||||||||||||
| Br(T2) ≈ Br(T1) × [1 + α(Br) × (T2−T1)/100] | ||||||||||||
| Hcj(T2) ≈ Hcj(T1) × [1 + β(Hcj) × (T2−T1)/100] | ||||||||||||
| YX-20s example, assuming Br(20°C) = 0.9 T and Hcj(20°C) = 1830 kA/m. Estimated values at 150°C: | ||||||||||||
| Br(150°C) ≈ 0.9 × [1 + (-0.045) × 130/100] = 0.84735 T | ||||||||||||
| Hcj(150°C) ≈ 1830 × [1 + (-0.28) × 130/100] = 1163.88 kA/m | ||||||||||||
| Sm₁Co₅ | Unit | SmCo5 Magnet |
|---|---|---|
| Density (D) | G/Cm3 | 8.3 |
| Curie Temperature (Tc) | K | 1000 |
| Vickers Hardness (Hv) | HV | 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 |