Date：2025-05-28 Views：1037
The 1:5 samarium cobalt, also known as samarium cobalt 5 or SmCo5, is a magnetic material made from samarium, cobalt, or partly praseodymium-substituted samarium, blended in certain proportions and processed through melting, crushing, pressing, and sintering. Its maximum energy product ranges from 16 to 25, with a maximum operating temperature of 250°C. While its maximum energy product is lower than that of 2:17 samarium cobalt magnets, it has better mechanical properties and ductility. It’s less brittle than 2:17 magnets, making it suitable for machining into complex shapes like thin discs, squares, rings, and various irregular forms hard to achieve with 2:17 magnets.
Additionally, it requires a lower magnetizing field—about 40,000 gauss for saturation, compared to 60,000 gauss or more for high-coercivity 2:17 magnets. Due to its nearly 40% rare earth content, it’s more expensive than 2:17 magnets. Users should select between 1:5 and 2:17 types based on specific application requirements
Material | Grade | Br Residual Magnetism | Hcb Coercive Force | Hcj Intrinsic Coercive Force | (BH)max Maximum Energy Product | Tc Curie Temperature | Tw Maximum Operating Temperature | Br Temperature Coefficient α(Br) | Hcj Temperature Coefficient β(Hcj) | ||||
T | KGs | KA/m | KOe | KA/m | KOe | KJ/m³ | MGOe | ℃ | ℃ | %/℃ | %/℃ | ||
Pure Samarium Cobalt SmCo₅ | 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 | -0.040 | -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 | |
Low Temperature Coefficient 1:5 (SmGd)Co₅ | LTC(YX-10) | 0.62-0.66 | 6.2-6.6 | 485-517 | 6.1-6.5 | ≥1830 | ≥23 | 75-88 | 9.5-11 | 750 | 300 | Temperature Range 20-100℃ 100-200℃ 200-300℃ | Br Temperature Coefficient +0.0156%/℃ +0.0087%/℃ +0.0007%/℃ |
Theoretical Calculation of Br and Hcj at High Temperatures | The temperature coefficients of remanence (Br) and intrinsic coercivity (Hcj) are measured between 20°C and 150°C for reference only.Theoretical calculation formulas (T1 = room temperature (usually 20°C), T2 = high temperature): Br@T2=Br@T1-[(T2-T1)*α(Br)*Br@T1] Hcj@T2=Hcj@T1-[(T2-T1)*β(Hcj)*Hcj@T1] For example, for YX-20s with Br = 0.9 T and Hcj = 1830 KA/m, the theoretical values at 150°C are 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 | ||||||||||||
Notes: 1） Magnetic property testing may have slight errors, but the error rate is less than 1%. Due to incomplete testing of raw materials, there may be individual deviations in the performance indicators of all grades. For example, for YX-22s grade, Br = 9.2-9.6 KGs (with less than 5% of the performance range possibly between 9.15-9.64 KGs). 2） The maximum operating temperature is greatly related to the specific working environment,load coil, and other factors. 3） With the advancement of technology, performance indicators may change. Please refer to the latest NGYC performance table. | |||||||||||||
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