SmCo Magnets
Samarium-Cobalt magnets were developed in 1960. They are produced by pressing alloys to shape, then sintered. Two different compositions are available: SmCo5 and Sm2Co17 (with higher coercivity). Among the rare-earth magnets, it has the best Br temperature coefficient (-0,035%/°C) granting the absolute highest available induction above 150°C operating temperature.
Despite a higher cost than other magnetic materials, SmCo provides an outstanding combination of high energy, thermal stability and corrosion resistance.The typical final shapes such as blocks, cylinders, rings and arcs are obtained by cutting and grinding processes of pressed standard blocks or unitary compression pre-moulded part. Because of its high brittleness, it has to be handled and assembled with care to avoid chips and cracks. SmCo Remanece Coercivity force(HcB) Coercivity force(HcJ) Energy product Max. operating temperature mT KGs KA/m KOe KA/m KOe KJ/m³ MGOe °C SmCo5 16 8.1-8.5 620-660 7.8-8.3 >1200 >15 110-127 14-16 250 SmCo5 18 8.5-8.9 660-700 8.3-8.8 >1200 >15 127-145 16-18 250 SmCo5 20 9.0-9.4 680-725 8.5-9.1 >1200 >15 145-160 18-20 250 SmCo5 22 9.2-9.6 710-750 8.9-9.4 >1200 >15 160-175 20-22 250 SmCo5 24 9.6-10.0 730-770 9.2-9.7 >1200 >15 175-190 22-24 250 Sm2Co17 24 9.5-10.2 700-750 8.7-9.4 >1433 >18 175-190 22-24 300 Sm2Co17 26 10.2-10.5 750-780 9.4-9.8 >1433 >18 190-207 24-26 300 Sm2Co17 28 10.3-10.8 756-796 9.5-10.0 >1433 >18 207-220 26-28 300 Sm2Co17 30 10.8-11.0 788-835 9.9-10.5 >1433 >18 220-240 28-30 300 Sm2Co17 26M 10.2-10.5 750-780 9.4-9.8 >955 >12 190-207 24-26 300 Sm2Co17 28M 10.3-10.8 756-796 9.5-10.0 >955 >12 207-220 26-28 300 Sm2Co17 30M 10.8-11.0 788-835 9.9-10.5 >955 >12 220-240 28-30 300 Sm2Co17 24H 9.5-10.2 700-750 8.7-9.4 >1900 >25 175-190 22-24 350 Sm2Co17 26H 10.2-10.5 750-780 9.4-9.8 >1900 >25 190-207 24-26 350 Sm2Co17 28H 10.3-10.8 756-796 9.5-10.0 >1900 >25 207-220 26-28 350 Sm2Co17 30H 10.8-11.0 788-835 9.9-10.5 >1900 >25 220-240 28-30 350 Temperature coefficient of remanence Br: -0,03 %/°C to -0,04 %/°C (for 20 °C to 100 °C) Curie temperature: 750-800 °C
quality category
(Br)
(BHmax)
810-850
850-890
900-940
920-960
960-1000
950-1020
1020-1050
1030-1080
1080-1100
1020-1050
1030-1080
1080-1100
950-1020
1020-1050
1030-1080
1080-1100
The specific density of SmCo materials is at 8,3-8,5 g/cm³
Temperature coefficient of coercivity (HcJ): -0,25 %/°C to -0,3 %/°C (for 20 °C to 100 °C)
