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SmCo
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 strengh 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(CoY99.95%). 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.

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Magnetic Properties of SmCo

Grade

Max. Energy Product

Remanence

Coercive Force

Rev. Temp. Coeff.

Working Temp.

Density

(BH)max

Br

Hc

Hci

Bd

Hd

Tw

D

MGOe

kJ/m3

kG

mT

kOe

kA/m

kOe

kA/m

%/°C

%/°C

°C

g/cm3

SmCo5 16A

16.0

130.0

8.2

820

7.5

600

>16.0

>1270

-0.05

0.25

250

8.4

SmCo5 16B

16.0

130.0

8.2

820

7.5

600

>20.0

>1590

-0.05

0.25

250

8.4

SmCo5 18A

18.0

146.3

8.7

870

8.2

656

>16.0

>1272

-0.05

0.25

250

8.4

SmCo5 18B

18.0

146.3

8.7

870

8.2

656

>20.0

>1590

-0.05

0.25

250

8.4

SmCo5 20A

20.0

162.5

9.0

900

8.6

690

>16.0

>1272

-0.05

0.25

250

8.4

SmCo5 20B

20.0

162.5

9.0

900

8.6

690

>20.0

>1590

-0.05

0.25

250

8.4

SmCo5 22A

22.0

178.8

9.5

950

9.1

728

>16.0

>1272

-0.05

0.25

250

8.4

SmCo5 22B

22.0

178.8

9.5

950

9.1

728

>20.0

>1590

-0.05

0.25

250

8.4

Sm2Co17 24

24.0

195.0

10.0

1000

9.5

760

>20.0

>1590

-0.03

0.23

300

8.3

Sm2Co17 26A

26.0

211.3

10.6

1060

9.8

784

>16.0

>1272

-0.03

0.23

300

8.3

Sm2Co17 26B

26.0

211.3

10.6

1060

9.8

784

>20.0

>1590

-0.03

0.23

300

8.3

Sm2Co17 26H

26.0

211.3

10.6

1060

9.8

784

>26.0

>2067

-0.03

0.23

300

8.3

Sm2Co1728A

28.0

227.5

10.9

1090

10.0

800

>16.0

>1272

-0.03

0.23

300

8.3

Sm2Co17 28B

28.0

227.5

10.9

1090

10.0

800

>20.0

>1590

-0.03

0.23

300

8.3

Sm2Co17 28H

28.0

227.5

10.9

1090

10.0

800

>26.0

>2067

-0.03

0.23

300

8.3

Sm2Co17 30A

30.0

243.8

11.0

1100

10.2

816

>16.0

>1272

-0.03

0.23

300

8.3

Sm2Co17 30B

30.0

243.8

11.2

1120

10.2

816

>20.0

>1590

-0.03

0.23

300

8.3

Sm2Co17 32

31.0

251.8

11.5

1150

10.0

800

>15.0

>1192

-0.03

0.23

300

8.3

Sm2Co17 25H

25.0

203.2

10.5

1050

9.7

776

>35.0

>2782

-0.03

0.23

375

8.3

Physical Characteristics

 

SmCo5

Sm2Co17

Temperature Coefficient of Br (%/°C)

-0.05

-0.03

Temperature Coefficient of iHc (%/°C)

-0.3

-0.2

Curie Temperature (°C)

700-750

800-850

Density (g/cm3)

8.2-8.4

8.3-8.5

Vickers Hardness (HV)

450-500

500-600

Working Temperature (°CC)

250

350


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