SmCo

Download: Performance of SmCo Magnets


Samarium Cobalt Magnet Materials 

As part of the rare earth group of permanent magnets, samarium cobalt (SmCo) magnets typically fall into two families of materials. They include rare earth Sm1Co5 and Sm2Co17 and are referred to as 1:5 and 2:17 materials. There’re three different manufacturing processes: sintered SmCo magnet, bonded SmCo magnet, and injection moulding SmCo magnet. SmCo magnet is high performance, low temperature coefficient permanent made of samarium and cobalt and other rare-earth elements. Its biggest advantage is high working temperature-300 degree centigrade. It need to be coated because it is difficult to be eroded and oxidized. SmCo magnet is widely used in motor, watch, transducers, instruments, positional detector, generator, radar, etc

Samarium Cobalt holds its standard property in higher maximum temperatures than neodymium, although its maximum strength is less. The cost of SmCo material is the most expensive, so SmCo is recommended only when its performance is a high temperature environment is a concern.

1. SmCo permanent magnet has high magnetic energy product and high coercive force. Its properties are better than Alnico, ferrite permanent magnet. Its max. energy product is up to 239kJ/m3(30MGOe), which is three times of that of AlNiCo8 permanent magnet, eight times of that of ferrite permanent magnet (Y40). So the permanent magnetic component made from SmCo material is small, light and stable in property. It is widely applied to electro acoustic& telecommunication apparatus, electric motors, measure meters, peg-top electronic watch, microwave apparatus, magnetic mechanism, sensor and other static or dynamic magnetic routes.

2. The curie temp. of the SmCo permanent magnet is high and its temp. Coeff. is low. So it is suitable for use at 300, high temp.

3. SmCo permanent magnet is hear and bristle. Its rigidity strength, tensile strength and press strength are low. So it is not suitable for framework.

4. The main ingredient of SmCo permanent magnet is metal cobalt(Co: 99.95%). So its price is high. 

 

The characteristics of Samarium Cobalt Magnet 

*Very high magnetic properties with good stability. 
*Superior resistance to high temperature, Curie temperature of majority is over 800℃.
*Excellent corrosion resistance capability, no coating is needed for surface protection.

Typical Magnetic Performance for Sintered SmCo Magnet

Grade Br Hcb Hcj (BH)max Tc Tw Remark
T KGS KA/m Koe KA/m Koe KJ/m3 MGOe ℃ ℃
YX-16 0.81-0.85 8.10-8.50 620-660 7.80-8.30 1194-1830 15-23 110-127 14-16 750 250 1:5
YX-18 0.85-0.90 8.50-9.00 660-700 8.30-8.80 1194-1830 15-24 127-143 16-18 750 250
YX-20 0.90-0.94 9.00-9.40 680-725 8.50-9.10 1194-1831 15-25 150-167 19-21 750 250
YX-22 0.92-0.96 9.20-9.60 710-750 8.90-9.40 1194-1832 15-26 160-175 20-22 750 250
YX-24 0.96-1.00 9.60-10.00 730-770 9.20-9.70 1194-1833 15-27 175-190 22-24 750 250
YX-20S 0.90-0.94 9.00-9.40 680-725 8.50-9.10 1433-1830 18-23 143-160 18-20 750 250
YX-22S 0.92-0.96 9.20-9.60 710-750 8.90-9.40 1433-1830 18-23 160-175 20-22 750 250
LTc(YX-10) 0.59-0.63 5.90-6.30 460-493 5.80-6.20 1430-1830 18-23 68---80 8.5-10 700 250
YX-12 0.70-0.74 7.00-7.40 358-390 4.50-4.90 358---478 4.5-6 80-103 10-13 450 200
YXG-24H 0.95-1.02 9.50-10.20 700-750 8.70-9.40 ≥1990 ≥25 175-191 22-24 800 350 2:17
YXG-26H 1.02-1.05 10.20-10.50 750-780 9.40-9.80 ≥1990 ≥25 191-207 24-26 800 350
YXG-28H 1.03-1.08 10.30-10.80 756-796 9.50-10.00 ≥1990 ≥25 207-220 26-28 800 350
YXG-30H 1.08-1.10 10.80-11.00 788-835 9.90-10.50 ≥1990 ≥25 220-240 28-30 800 350
YXG-24 0.95-1.02 9.50-10.20 700-750 8.70-9.40 ≥1433 ≥18 175-191 22-24 800 300
YXG-26 1.02-1.05 10.20-10.50 750-780 9.40-9.80 ≥1433 ≥18 191-207 24-26 800 300
YXG-28 1.03-1.08 10.30-10.80 756-796 9.50-10.00 ≥1433 ≥18 207-220 26-28 800 300
YXG-30 1.08-1.10 10.80-11.00 788-835 9.90-10.50 ≥1433 ≥18 220-240 28-30 800 300
YXG-26M 1.02-1.05 10.20-10.50 750-780 9.40-9.80 955-1273 12-16 191-207 24-26 800 300
YXG-28M 1.03-1.08 10.30-10.80 756-796 9.50-10.00 955-1273 12-16 207-220 26-28 800 300
YXG-30M 1.08-1.10 10.80-11.00 788-835 9.90-10.50 955-1273 12-16 220-240 28-30 800 300
YXG-28L 1.02-1.08 10.20-10.80 413-716 5.20-9.00 438---796 5.5-10 207-220 26-28 800 250
YXG-30L 1.08-1.15 10.80-11.50 416-716 5.20-9.00 438---796 5.5-10 220-240 28-30 800 250
LTC(YXG-22) 0.94-0.98 9.40-9.80 688-715 8.40-9.00 1194-1591 15-20 167-183 21-23 840 300

Typical Magnetic Performance for Sintered SmCo Magnet

Material

 Br Hcb Hcj BHmax Density Tw Max Remark
kGs mT kA/m kOe kA/m kOe KJ/m3 MGOe g/cm3 ℃

SmCo16

 8.30 830 640 8.00 1430 18 128 16 8.3 250 1:5

SmCo18

 8.80 880 680 8.50 1430 18 144 18 8.3 250

SmCo20

 9.20 920 700 8.70 1430 18 160 20 8.3 250

SmCo22

 9.40 940 730 9.10 1450 18 176 22 8.3 250

SmCo24

 9.80 980 750 9.40 1450 18 192 24 8.3 250

SmCo24

 9.80 980 730 9.10 1450 18 192 24 8.4 300 2:17

SmCo26

 10.30 1030 760 9.50 1450 18 208 26 8.4 300

SmCo28

 10.50 1050 780 9.70 1450 18.5 224 28 8.4 300

SmCo30

 11.00 1100 810 10.10 1450 18.5 240 30 8.4 300

SmCo26M

 10.30 1030 760 9.50 1100 15 208 26 8.4 300

SmCo28M

 10.50 1050 780 9.70 1100 15 224 28 8.4 300

SmCo30M

 11.00 1100 810 10.10 1100 15 240 30 8.4 300

SmCo28L

 10.50 1050 550 6.90 700 8 224 28 8.4 250

SmCo30L

 11.00 1100 550 6.90 700 8 240 30 8.4 250

SmCo24H

 10.00 1000 720 9.00 2000 25 192 24 8.4 350

SmCo26H

 10.30 1030 760 9.50 2000 25 208 26 8.4 350

SmCo28H

 10.50 1050 770 9.60 2000 25 224 28 8.4 350

SmCo30H

 10.80 1080 810 10.10 2000 25 240 30 8.4 350

Typical Magnetic Performance for Sintered SmCo Magnet

Material Br bHc jHc (BH) max Temp. Coeff. Tw Max Density
kGs T kOe kA/m kOe kA/m mGOe kJ/m3 αBr αjHc ℃ g/cm3
RCS16 7.5-8.8 0.75-0.88 7.0-8.0  557-637 ≧25  ≧1900 14-18 111-143 -0.045 -0.30 250 8.00-8.20
RCS18(SmCo5) 8.2-8.5 0.82-0.85 7.5-8.0 597-639 ≧15 ≧1199 17-19 135-151 -0.045 -0.30 250 8.20-8.30
RCS20(SmCo5) 8.5-9.0 0.85-0.90 7.5-8.0 597-639 ≧15 ≧1199 19-21 151-167 -0.045 -0.30 250 8.20-8.30
RCS22(SmCo5) 9.0-9.5 0.90-0.95 7.5-8.0 597-639 ≧18 ≧1440 21-23 167-183 -0.045 -0.30 250 8.20-8.30
RCS24(Sm2Co17) 9.5-10.0 0.95-1.00 8.2-10.0 655-799 ≧15 ≧1199 22-24 175-191 -0.045 -0.30 300 8.30-8.50
RCS24H(Sm2Co17) 9.5-10.0 0.95-1.00 8.2-10.0 655-799 ≧18 ≧1440 22-24 175-191 -0.035 -0.29 300 8.30-8.50
RCS26(Sm2Co17) 10.0-10.5 1.00-1.05 8.2-10.0 655-799 ≧15 ≧1199 24-26 191-210 -0.045 -0.30 300 8.30-8.50
RCS26H(Sm2Co17) 10.0-10.5 1.00-1.05 8.2-10.0 655-799 ≧18 ≧1440 24-26 191-210 -0.035 -0.29 300 8.30-8.50
RCS28(Sm2Co17) 10.5-10.8 1.05-1.08 8.2-10.0 655-799 ≧15 ≧1199 26-28 210-223 -0.045 -0.30 300 8.30-8.50
RCS28H(Sm2Co17) 10.5-10.8 1.05-1.08 8.2-10.0 655-799 ≧18 ≧1440 26-28 210-223 -0.035 -0.29 300 8.30-8.50