In addition to saturation magnetization, Curie temperature of Sm2Co17 can approach to 922 degrees Celsius which significantly higher than SmCo5 and Nd-Fe-B based alloy. Intrinsic coercivity of pure Sm2Co17 alloy is not high enough and practical Sm2Co17 magnet need to utilize transition metal Iron (Fe), Copper (Cu), and Zirconium (Zr) to replace Cobalt (Co) in Sm2Co17 alloy. Ojima reported 238.8kJ/m3 for Sm(Co, Cu, Fe, Zr)7.2 and sat a new (BH)max record in 1977. Sm2Co17 magnet thus is referred as the second generation of the rare earth magnet. The most notable products of Sm2Co17 magnet include high performance SmCo magnet, temperature compensated SmCo magnet, and ultra high temperature SmCo magnet.
Magnetic Properties of Sm2Co17 Magnet
| Grade | Remanence Br | Coercivity Hcb | Intrinsic Coercivity Hcj | Max. Energy Product (BH)max | Curie Temp. Tc | Max. Ope. Tem. Tw | Temp. Coeff. of Br | Temp. Coeff. of Hcj | ||||
| T | kGs | kA/m | kOe | kA | kOe | kJ/m3 | MGOe | ℃ | ℃ | %/℃ | %/℃ | |
| RE2Co17-24H | 0.95-1.02 | 9.5-10.2 | 692-764 | 8.7-9.6 | ≥1990 | ≥25.0 | 175-191 | 22-24 | 800 | 350 | -0.025 | -0.20 |
| RE2Co17-26H | 1.02-1.05 | 10.2-10.5 | 740-788 | 9.4-10.0 | ≥1990 | ≥25.0 | 191-207 | 24-26 | 800 | 350 | -0.030 | -0.20 |
| RE2Co17-28H | 1.03-1.08 | 10.3-10.8 | 756-812 | 9.5-10.2 | ≥1990 | ≥25.0 | 207-220 | 26-28 | 800 | 350 | -0.035 | -0.20 |
| RE2Co17-30H | 1.08-1.10 | 10.8-11.0 | 788-835 | 9.9-10.5 | ≥1990 | ≥25.0 | 220-240 | 28-30 | 800 | 350 | -0.035 | -0.20 |
| RE2Co17-32H | 1.10-1.13 | 11.0-11.3 | 812-860 | 10.2-10.8 | ≥1990 | ≥25.0 | 230-255 | 29-32 | 800 | 350 | -0.035 | -0.20 |
| RE2Co17-22 | 0.93-0.97 | 9.3-9.7 | 676-740 | 8.5-9.3 | ≥1433 | ≥18.0 | 160-183 | 20-23 | 800 | 300 | -0.020 | -0.20 |
| RE2Co17-24 | 0.95-1.02 | 9.5-10.2 | 692-764 | 8.7-9.6 | ≥1433 | ≥18.0 | 175-191 | 22-24 | 800 | 300 | -0.025 | -0.20 |
| RE2Co17-26 | 1.02-1.05 | 10.2-10.5 | 748-796 | 9.4-10.0 | ≥1433 | ≥18.0 | 191-207 | 24-26 | 800 | 300 | -0.030 | -0.20 |
| RE2Co17-28 | 1.03-1.08 | 10.3-10.8 | 756-812 | 9.5-10.2 | ≥1433 | ≥18.0 | 207-220 | 26-28 | 800 | 300 | -0.035 | -0.20 |
| RE2Co17-30 | 1.08-1.10 | 10.8-11.0 | 788-835 | 9.9-10.5 | ≥1433 | ≥18.0 | 220-240 | 28-30 | 800 | 300 | -0.035 | -0.20 |
| RE2Co17-32 | 1.10-1.13 | 11.0-11.3 | 812-860 | 10.2-10.8 | ≥1433 | ≥18.0 | 230-255 | 29-32 | 800 | 300 | -0.035 | -0.20 |
| RE2Co17-26M | 1.02-1.05 | 10.2-10.5 | 676-780 | 8.5-9.8 | 955-1433 | 12-18 | 191-207 | 24-26 | 800 | 300 | -0.035 | -0.20 |
| RE2Co17-28M | 1.03-1.08 | 10.3-10.8 | 676-796 | 8.5-10.0 | 955-1433 | 12-18 | 207-220 | 26-28 | 800 | 300 | -0.035 | -0.20 |
| RE2Co17-30M | 1.08-1.10 | 10.8-11.0 | 676-835 | 8.5-10.5 | 955-1433 | 12-18 | 220-240 | 28-30 | 800 | 300 | -0.035 | -0.20 |
| RE2Co17-32M | 1.10-1.13 | 11.0-11.3 | 676-852 | 8.5-10.7 | 955-1433 | 12-18 | 230-255 | 29-32 | 800 | 300 | -0.035 | -0.20 |
| RE2Co17-24L | 0.95-1.02 | 9.5-10.2 | 541-716 | 6.8-9.0 | 636-955 | 8-12 | 175-191 | 22-24 | 800 | 250 | -0.025 | -0.20 |
| RE2Co17-26L | 1.02-1.05 | 10.2-10.5 | 541-748 | 6.8-9.4 | 636-955 | 8-12 | 191-207 | 24-26 | 800 | 250 | -0.035 | -0.20 |
| RE2Co17-28L | 1.03-1.08 | 10.3-10.8 | 541-764 | 6.8-9.6 | 636-955 | 8-12 | 207-220 | 26-28 | 800 | 250 | -0.035 | -0.20 |
| RE2Co17-30L | 1.08-1.15 | 10.8-11.5 | 541-796 | 6.8-10.0 | 636-955 | 8-12 | 220-240 | 28-30 | 800 | 250 | -0.035 | -0.20 |
| RE2Co17-32L | 1.10-1.15 | 11.0-11.5 | 541-812 | 6.9-10.2 | 636-955 | 8-12 | 230-255 | 29-32 | 800 | 250 | -0.035 | -0.20 |
| LTC(RE2Co17-16) | 0.81-0.85 | 8.1-8.5 | 605-669 | 7.6-8.4 | ≥1592 | ≥20 | 117-127 | 14-16 | 840 | 300 | -50-20℃: +0.005 20-100℃: -0.008 100-200℃: -0.008 200-300℃: -0.011 | – |
| LTC(RE2Co17-18) | 0.85-0.90 | 8.5-9.0 | 629-708 | 7.9-8.9 | ≥1592 | ≥20 | 127-143 | 16-18 | 840 | 300 | ||
| LTC(RE2Co17-20) | 0.90-0.94 | 9.0-9.4 | 661-732 | 8.3-9.2 | ≥1592 | ≥20 | 143-159 | 18-20 | 840 | 300 | ||
| LTC(RE2Co17-22) | 0.94-0.97 | 9.4-9.7 | 685-740 | 8.6-9.3 | ≥1592 | ≥20 | 159-175 | 20-22 | 840 | 300 | ||
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