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SmCo Magnet

SmCo magnets known as Samarium, Samarium Cobalt or rare earth Cobalt magnets, are the second generation of rare earth permanent magnets. According to the difference between the production technologies, SmCo can be divided into bonded SmCo and sintered SmCo, but we are only specialized in sintered SmCo.

The sintered SmCo are anisotropic and can only be magnetized in the orientation direction. They consist mainly of Sm (Samarium) and Co (Coblat), and they are available with two series of materials, SmCo5 and Sm2Co17 often referred to as SmCo 1:5 and SmCo 2:17. SmCo5 have lower energy, Hcj (intrinsic coercive force), maximum operation temperature and Curie temperature than Sm2Co17, but SmCo5 are easier to magnetize to saturation.

They are available in a number of grades that span a wide range of properties and application requirements. They are powerful, with (BH)max range of 14MGOe~32MGOe; however, they are also very brittle and prone to cracking and chipping, so they must be handled with care and adequate protective gear. Due to their relative frailty, mechanisms and applications in which the magnets are used must be adapted and designed to support the material.

Characteristics:

High magnetic values – Br high to 11.3 kGs (1.13 T) and (BH)max high to 32 MGOe (255 kJ/m3)

High working temperature – maximum working temperature high to 250ºC~350ºC

Outstanding thermal stability – α(Br) low to -0.03 %/ºC and β(Hcj) low to -0.2%/ºC

Excellent corrosion resistance – no surface treatment needed

Excellent demagnetization resistance – maximum Hcj higher than 25 kOe (1990 kA/m)

Applications:

Due to their characteristics above, SmCo are the ideal magnetic material in following applications, particularly where the magnets are required to operate at high temperatures, across a broad temperature range, with stable magnetic field, or in a corrosive environment: travelling wave tubes, circulators, isolators, speakers, magnetron sputtering cathodes, sensors, servo motors, pump couplings, chemical pumps, magnetic assemblies, etc

Physical Properties:

Characteristics

Reversible Temperature Coefficient 20-150ºC, α(Br)

Reversible Temperature Coefficient 20-150ºC, β(Hcj)

Coefficient of Thermal Expansion

Thermal Conductivity

Specific Heat

Curie Temperature

Flexural Strength

Density

Hardness, Vickers

Electrical Resistivity

Unit

%/ºC

%/ºC

ΔL/L per ºCx10-6

kcal/mhrºC

cal/gºC

ºC

Mpa

g/cm3

Hv

μΩ • cm

SmCo5

-0.04

-0.2

//6⊥12

750

150-180

450-550

50~60

Sm2Co17

-0.03

-0.2

//9⊥11

850

130-150

550-650

80~90

Magnetic Properties:

Material

Grade

Residual Induction

Coercivity

Intrinsic Coercivity

Maximum Energy Product

Density

Curie Temp.

Maximum Operating Temp.

Br

Hcb

Hcj

(BH )max

D

α(Br)

β(Hcj)

Tc

Tw

T

kG

kA/m

kOe

kA/m

kOe

kJ/m3

MGOe

g/cm3

%/°C

%/°C

°C

°C

SmCo5

YX16

612-660

>1194

>15

110-135

14-17

-0.04

-0.20

750

250

YX16H

612-660

>1592

>20

110-135

14-17

-0.04

-0.20

750

250

YX18

644-700

>1194

>15

127-151

16-19

-0.04

-0.20

750

250

YX18H

644-700

>1592

>20

127-151

16-19

-0.04

-0.20

750

250

YX20

676-725

>1194

>15

143-167

18-21

-0.04

-0.20

750

250

YX20H

676-725

>1592

>20

143-167

18-21

-0.04

-0.20

750

250

YX22

710-748

>1194

>15

160-183

20-23

-0.04

-0.20

750

250

YX22H

710-748

>1592

>20

160-183

20-23

-0.04

-0.20

750

250

YX24

730-780

>1194

>15

175-199

22-25

-0.04

-0.20

750

250

YX24H

730-780

>1592

>20

175-199

22-25

-0.04

-0.20

750

250

Sm2Co17

YXG22

676-740

>1433

>18

160-183

20-23

-0.03

-0.20

850

350

YXG22H

676-740

>1990

>25

160-183

20-23

-0.03

-0.20

850

350

YXG24

692-764

>1433

>18

175-191

22-24

-0.03

-0.20

850

350

YXG24H

692-764

>1990

>25

175-191

22-24

-0.03

-0.20

850

350

YXG26M

541-780

636-1433

8-18

191-207

24-26

-0.03

-0.20

850

300

YXG26

748-796

>1433

>18

191-207

24-26

-0.03

-0.20

850

350

YXG26H

748-796

>1990

>25

191-207

24-26

-0.03

-0.20

850

350

YXG28M

541-796

636-1433

8-18

207-223

26-28

-0.03

-0.20

850

300

YXG28

756-812

>1433

>18

207-223

26-28

-0.03

-0.20

850

350

YXG28H

756-812

>1990

>25

207-223

26-28

-0.03

-0.20

850

350

YXG30M

541-835

636-1433

8-18

223-240

28-30

-0.03

-0.20

850

300

YXG30

788-835

>1433

>18

223-240

28-30

-0.03

-0.20

850

350

YXG30H

788-835

>1990

>25

223-240

28-30

-0.03

-0.20

850

350

YXG32M

541-844

636-1433

8-18

230-255

29-32

-0.03

-0.20

850

300

YXG32

812-844

>1433

>18

230-255

29-32

-0.03

-0.20

850

350

YXG32H

812-844

>1990

>25

230-255

29-32

-0.03

-0.20

850

350

Low Temp. Coefficient Sm2Co17

YXG22LT

668-716

>1194

>15

167-183

21-23

-0.015

-0.20

850

350

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