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Sintered SmCo magnet

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.

The characteristics of Samarium Cobalt Magnet

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

Typical Magnetic Porperties of Samarium Cobalt Materials

Properties of SmCo Permanent Magnet

Grade

Residual Flux Density Br

Coercive Force Hcb

Intrinsic Coercive force Hcj

Max. energy product (BH)max

mT

kGs

kA/m

koe

kA/m

koe

kJ/m3

MGoe

SmCo-YX6

500~600

5.0~6.0

≥358

4.5~5.5

≥960

≥12.0

47~72

6~9

SmCo-YX10

600~700

6.0~7.0

≥438

5.5~6.5

≥1200

≥15.0

64~88

8~11

SmCo-YX12

700~750

7.0~7.5

≥520

6.5~7.3

≥1591

≥20.0

96~120

12~15

SmCo5-YX16

750~880

7.5~8.8

597±40

7.5±0.5

≥1591

≥20.0

127±16

16±2

SmCo-YX16A

750~880

7.5~8.8

597±40

7.5±0.5

≥1989

≥25.0

127±16

16±2

SmCo-YX16B

750~880

7.5~8.8

597±40

7.5±0.5

≥2386

≥30.0

127±16

16±2

Sm2Co17-YX18

800~930

8.0~9.3

637±40

8.0±0.5

≥1194

≥15.0

143±16

18±2

SmCo-YX18A

800~930

8.0~9.3

637±40

8.0±0.5

≥1591

≥20.0

143±16

18±2

SmCo-YX18T

800~930

8.0~9.3

637±40

8.0±0.5

≥1591

≥20.0

143±16

18±2

SmCo-YX18B

800~930

8.0~9.3

637±40

8.0±0.5

≥1989

≥25.0

143±16

18±2

Sm2Co17-YX20

900~980

9.0~9.8

637±40

8.0±0.5

≥1432

≥18.0

159±16

20±2

SmCo-YX20

900~950

9.0~9.5

≥670

8.5~9.2

≥1591

≥20.0

159±16

20±2

SmCo-YX20A

900~980

9.0~9.8

637±40

8.0±0.5

≥1989

≥25.0

159±16

20±2

SmCo-YX22

900~1030

9.0~10.3

653±40

8.2±0.5

≥1432

≥18.0

175±16

22±2

SmCo-YX22A

900~1030

9.0~10.3

653±40

8.2±0.5

≥1989

≥25.0

175±16

22±2

SmCo-YX24

950~1080

9.5~10.8

676±40

8.2±0.5

≥1432

≥18.0

191±16

24±2

SmCo-YX24A

1000~1100

10.0~11.0

676±40

8.2±0.5

≥1989

≥25.0

191±16

24±2

SmCo-YX26

1000~1130

10.0~11.3

357~516

4.5~6.5

413~556

5.0~7.0

207±16

26±2

YX26A

1000~1130

10.0~11.3

716±40

9.0±0.5

≥796

≥10.0

207±16

26±2

YX26B

1000~1130

10.0~11.3

716±40

9.0±0.5

≥1194

≥15.0

207±16

26±2

YX26C

1000~1130

10.0~11.3

716±40

9.0±0.5

≥1591

≥20.0

207±16

26±2

YX26D

1000~1080

10.0~10.8

≥732

9.0~10.5

≥2300

≥30.0

207±16

26±2

SmCo-YX28

1060~1180

10.6~11.8

357~516

4.5~6.5

413~556

5.0~7.0

223±16

28±2

SmCo-YX28A

1060~1180

10.6~11.8

763±40

9.6±0.5

≥796

≥10.0

223±16

28±2

SmCo-YX28B

1050~1150

10.5~11.5

≥750

9.4~9.8

≥960

≥12.0

223±16

28±2

SmCo-YX28C

1060~1180

10.6~11.8

763±40

9.6±0.5

≥1194

≥15.0

223±16

28±2

SmCo-YX30

1100~1200

11.0~12.0

438~597

5.5~6.5

454~597

5.7~7.5

238±16

30±2

SmCo-YX30A

1100~1200

11.0~12.0

≥560

7.0~8.5

≥716

≥12.0

238±16

30±2

Characteristics & application of SmCo permanent magnet

Typical Characteristic Curve for SmCo permanent magnet

Typical Characteristic Curve for SmCo permanent magnet

Characteristics & application of SmCo permanent magnet

  1. SmCo permanent magnet has high magnetic energy product and high cercive 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≥Y99.95%). So its price is high.

Reference points for application design of permanent magnet

  1. What we stated herein are typical grades of SmCo permanent magnet only. We could meet your requirements for various magnetic properties too.
  2. For application of permanent magnet at high temp., you need consider the following two important parameters: recoil temp. coeff (αBr) and intrinsic coercive force(Hcj). Recoil temp. coeff. is a parameter to measure the performance of the permanent magnet with the variation of the temp. When the temp come back to the initial value, the magnetic properties of the permanent magnet will reversibly return to the initial condition too. More smaller the temperature coefficient is, more lower the magnetic properties are. In the meantime, with the variation of the temperature, the magnetic properties of permanent magnet can change irreversibly. This is called irreversible loss. The irreversible loss descends with the increase of the intrinsic coercive force.
  3. The appropriate dimensions of he permanent magnet should be taken into account for the application design. Generally speaking, the demagnetization curve of SmCo permanent magnet is close to a straight line and the difference value between Residual Flux Density Br & coercive force Hcb is relatively small. So we should choose the working point (Pc value) around the Max. energy product, i.e. (BH)max. Thus we could utilize the magnetic energy fully and save the cost greatly. Design reference: 0.5≤Pc≤1.
  4. SmCo permanent magnet is a functional material. It is unsuitable for structure part design. So the usual requirement to the tolerance of the dimensions for structure part is not applicable to it. For the detailed tolerance design, please refer to "permanent magnet supply illustration".
  5. SmCo permanent magnet has strong anticorruption function. So it needn't similar surface treatment as that of NdFeB magnet. For the surface protect of SmCo permanent magnet, please turn to "surface protect and protect coating of permanent magnet". The coating will add to the cost in turn.