permanent magnet

SmCo Magnets

permanent magnet

SmCo Magnets

Samarium-cobalt magnets
Samarium-cobalt magnets are mainly divided into two series: 1:5 type (SmCo5) and 2:17 type (Sm2Co17). Sintered samarium-cobalt magnets are brittle and fragile, and cannot be machined using traditional methods; instead, grinding wheels with a high content of diamond must be used, along with water or oil for cooling. Performance: The Curie temperature of samarium-cobalt can reach 710-880°C, and the highest operating temperature can reach 250-350°C, which is higher than the 230°C maximum operating temperature of neodymium-iron-boron; samarium-cobalt has better corrosion resistance compared to neodymium-iron-boron; when the operating temperature is above 150°C, samarium-cobalt has lower magnetic flux loss compared to neodymium-iron-boron; the 1:5 type samarium-cobalt (SmCo5).
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Magnetic Properties

Material

Grade

Br

Hcb

Hcj

(BH)max

Tc

Tw

kGs

mT

kA/m

kOe

kA/m

kOe

KJ/m3

MGOe

°C

°C

SmCo

(1:5)

SM-18

8.5

850

620

7.8

≥1350

≥17

145~150

17~19

750

250

SM-20

9.0~9.6

900~960

653~717

8.2~9.0

1194~1513

15~19

150~175

19~22

750

250

SM-22

9.3~10.0

930~1000

660~772

8.3~9.7

1194~1751

15~22

159~191

20~24

750

250

SM-24

9.6~10.4

960~1040

660~780

8.3~9.8

1194~1751

15~22

175~207

22~26

750

250

SmCo

(2:17)

SMG-24

9.5~10.2

950~1020

637~732

8.0~9.2

1433~1990

18~25

175~190

22~24

800

300

SMG-26

10.2~10.5

1020~1050

748~796

9.4~10.0

1433~1990

18~25

195~215

24~26

800

300

SMG-28

10.5~10.8

1050~1080

756~796

9.5~10.0

1433~1831

18~23

205~220

26~28

800

300

SMG-30

10.7~11.2

1070~1120

677~820

8.5~10.3

≥1194

≥15

223~247

28~31

800

300

SMG-32

10.9~11.5

1090~1150

677~820

8.5~10.3

≥955

≥12

238~262

29~32

800

300

Surface Treatment

The corrosion resistance of SmCo is considered good while that of NdFeB is considered poor. Coatings for corrosion resistance are therefore not generally required for SmCo magnets. We also can offer coatings such as Ni, Zn, or Epoxy if they are used in corrosive environment.

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Temperature Characteristics

SmCo magnets can operate at temperatures up to 350°C, depending upon the grade and permeance coefficient. Sm2Co17 materials exhibit superior temperature characteristics as compared to the Sm1Co5 types. SmCo magnets have extremely resistant to demagnetization, and good temperature stability (maximum use temperatures between 250 °C and 550 °C).

Application

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The versatility of SmCo permanent magnets finds application across a diverse range of industries where magnetic stability and performance are paramount. Notably, it is a cornerstone material in critical sectors such as aerospace, defense, telecommunications, medical instrumentation, and electric motors, where demanding operating conditions necessitate the exceptional magnetic properties and reliability that SmCo magnets provide.

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