Block SmCo Magnets

Sintered samarium cobalt (SmCo) magnets, available since the early 1970's, offer the designer a tremendous combination of extremely high magnetic properties, outstanding thermal stability and excellent corrosion resistance. These characteristics make SmCo the ideal material in applications such as servo-motor, pump couplings, and sensors, particularly where the magnet is required to operate at high temperatures, across a broad temperature range or in a corrosive environment.

The first alloy composition was SmCo5 with maximum energy products of about 18 MGOe (140 kJ/m3). Shortly after this development, an additional alloy composition, Sm2Co17 was developed. This was developed over time to provide over 30 MGOe (240 kJ/m3). Although processing of the 2-17 composition is more difficult, it also has the advantage of containing less Cobalt than the 1-5 composition. Raw material costs are lower. 2-17 is also very corrosion resistant and more stable at very high temperatures. Both types are manufactured by precision machining to satisfy specific customer needs.
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MAGNETIC AND PHYSICAL CHARACTERISTICS OF SINTERED SMCO MAGNETS
MAGNETIC AND PHYSICAL CHARACTERISTICS OF SINTERED SMCO MAGNETS

Material

Grade

(BH)max

Br(min)

Hcb(min)

Hcj(min)

Density

Temp Coeff α (Br)

TC

Tw

KJ/m 3

MGsOe

T

KGs

KA/m

KOe

KA/m

KOe

g/cm 3

%/ ℃

℃

℃

SmCo5 and Sm(Pr)Co

XG18

127~159

16~20

0.82~0.92

8.2~9.2

639~756

8.0~9.5

1194~1751

15.0 ~22.0

8.3

-0.04

≥ 740

250

XG20

143~175

18~22

0.87~0.95

8.7~9.5

639~756

8.0~9.5

1194~1751

15.0 ~22.0

XG22

159~191

20~24

0.93~1.0

9.3~10.0

660~772

8.3~9.7

1194~1751

15.0 ~22.0

XG24

175~207

22~26

0.96~1.04

9.6~10.4

660~780

8.3~9.8

1194~1751

15.0 ~22.0

Sm2Co17

XGS24M

175~207

22~26

0.96~1.04

9.6~10.4

318~772

4.0~9.7

398~955

5.0 ~12.0

8.4

-0.03

≥ 850

350

XGS24

175~207

22~26

0.96~1.04

9.6~10.4

660~780

8.3~9.8

≥1194

≥ 15.0

XGS24H

175~207

22~26

0.96~1.04

9.6~10.4

660~780

8.3~9.8

≥1592

≥ 20 .0

XGS26M

191~223

25~28

1.0~1.07

10.0~10.7

318~796

4.0~10.0

398~955

5.0 ~12.0

XGS26

191~223

25~28

1.0~1.07

10.0~10.7

677~820

8.5~10.3

≥1194

≥ 15.0

XGS26H

191~223

25~28

1.0~1.07

10.0~10.7

677~820

8.5~10.3

≥1592

≥ 20 .0

XGS28M

207~239

26~30

1.04~1.10

10.4~11.0

318~796

4.0~10.0

398~955

5.0 ~12.0

XGS28

207~239

26~30

1.04~1.10

10.4~11.0

677~820

8.5~10.3

≥1194

≥ 15.0

XGS28H

207~239

26~30

1.04~1.10

10.4~11.0

677~820

8.5~10.3

≥1592

≥ 20 .0

XGS30M

223~247

28~31

1.07~1.12

10.7~11.2

318~796

4.0~10.0

398~955

5.0 ~12.0

XGS30

223~247

28~31

1.07~1.12

10.7~11.2

677~820

8.5~10.3

≥1194

≥ 15.0

XGS32M

238~262

29~32

1.09~1.15

10.9~11.5

318~796

4.0~10.0

398~955

5.0 ~12.0

XGS32

238~262

29~32

1.09~1.15

10.9~11.5

677~820

8.5~10.3

≥955

≥ 12.0

Low Temp Coeff Sm2Co17

XGS22LT

159~191

20~24

0.93~1.0

9.3~10.0

677~756

8.5~9.5

≥1194

≥ 15.0

8.4

-0.01

≥ 850

350

XGS24LT

175~207

22~26

0.96~1.04

9.6~10.4

677~756

8.5~9.5

≥1194

≥ 15.0

XGS26LT

191~223

25~28

1.0~1.07

10.0~10.7

677~812

8.5~10.2

≥1433

≥ 18.0

8.4

-0.02

≥ 850

350