Samarium Cobalt-SmCo magnet
SmCo(SamariumCobalt) Magnet is one of kind of rare earth magnet with a highPercentage of samarium, which is relatively stable against temperature change.With high energy product and excellent coercive force, this material is ideally compact and suitable to highly efficient machines and components,And widely used in application in which higher operation temperature, higherCorrosion and oxidation resistance are crucial. Two common compositions Of this kind of magnet are Sm1Co5 and Sm2Co17.
Samarium cobalt magnets have also a very strong magnetic field and they tend to resist demagnetization extremely well. Unlike Neodymium magnets, it is also very corrosion resistant. SmCo magnets can operate at higher temperatures up to 300��C and are widely used in applications in which higher operating temperature and higher corrosion and oxidation resistance are crucial.
Two common compositions of Samarium Cobalt magnets are Sm1Co5 and Sm2Co17. Generally, the cost of SmCo magnets is higher than NdFeB magnets. But NdFeB magnets are stronger than SmCo magnets.
Characteristics of Sintered Samarium Cobalts (SmCo)
Characteristics
Material Grade |
Remanence
Br |
Coercive Force
Hcb |
Intrinsic
Coercive Force
Hcj |
Max. Energy Product
(BH)max |
Curie Temp
Tc |
Density
ρ |
Temp. Coefficient
△Bd/Bd |
Thermal
Expansion
coefficient |
Vickers
Hardness
|
Tesal
(kGs) |
KA/m
(kOe) |
KA/m
(kOe) |
kJ/m3
(MGOe) |
(℃) |
g/cm3 |
(％℃) |
C⊥
(1℃) |
C∥
(1℃) |
Hv |
SmCo5 |
SM~18 |
0.8~0.9
(8.0~9.0) |
621~700
(7.8~8.8) |
≥1990
(≥25.0) |
127~159
(16.0~20.0) |
750~800 |
8.1~8.4 |
-0.05 |
13×10-6 |
6×10-6 |
450~500 |
SM~20 |
0.88~0.95
(8.8~9.5) |
676~740
(8.5~9.3) |
≥1432
(≥18.0) |
151~167
(19~21) |
750~800 |
8.1~8.4 |
-0.05 |
13×10-6 |
6×10-6 |
450~500 |
SM~22 |
0.94~1.00
(9.4~10.0) |
716~756
(8.8~9.5) |
≥1194
(≥15.0) |
167~183
(21~23) |
750~800 |
8.1~8.4 |
-0.05 |
13×10-6 |
6×10-6 |
450~500 |
Sm2Co 17 |
SM~18T |
0.85~0.95
(8.5~9.5) |
636~716
(8.0~9.0) |
≥1592
(≥20.0) |
127~159
(16.0~20.0) |
800~900 |
8.3~8.5 |
-0.01 |
11×10-6 |
8×10-6 |
500~600 |
SM~22T |
0.95~1.00
(9.4~10.0) |
676~756
(8.5~9.5) |
≥1592
(≥20.0) |
159~191
(20.0~24.0) |
800~900 |
8.3~8.5 |
-0.01 |
11×10-6 |
8×10-6 |
500~600 |
SM~22L |
0.95~1.00
(9.5~10.0) |
477~557
(6.0~7.0) |
493~716
(6.2~9.0) |
159~191
(20.0~24.0) |
800~850 |
8.3~8.5 |
-0.03 |
11×10-6 |
8×10-6 |
500~600 |
SM~22H |
0.95~1.00
(9.5~10.0) |
557~756
(7.0~9.5) |
≥637
(≥8.0) |
159~191
(20.0~24.0) |
800~850 |
8.3~8.5 |
-0.03 |
11×10-6 |
8×10-6 |
500~600 |
SM~22U |
0.95~1.00
(9.5~10.0) |
716~796
(9.0~10.0) |
≥1990
(≥25.0) |
159~191
(20.0~24.0) |
800~850 |
8.3~8.5 |
-0.03 |
11×10-6 |
8×10-6 |
500~600 |
SM~26L |
1.02~1.08
(10.2~10.8) |
477~557
(6.0~7.0) |
493~716
(6.2~9.0) |
191~223
(24.0~28.0) |
800~850 |
8.3~8.5 |
-0.03 |
11×10-6 |
8×10-6 |
500~600 |
SM~26H |
1.00~1.06
(10.0~10.6) |
557~812
(7.0~10.2) |
≥637
(≥8.0) |
191~223
(24.0~28.0) |
800~850 |
8.3~8.5 |
-0.03 |
11×10-6 |
8×10-6 |
500~600 |
SM~26U |
1.02~1.08
(10.2~10.8) |
756~836
(9.5~10.5) |
≥1990
(≥25.0) |
191~223
(24.0~28.0) |
800~850 |
8.3~8.5 |
-0.03 |
11×10-6 |
8×10-6 |
500~600 |
SM~30L |
1.08~1.12
(10.8~11.2) |
477~557
(6.0~7.0) |
493~716
(6.2~9.0) |
223~247
(28.0~31.0) |
800~850 |
8.3~8.5 |
-0.03 |
11×10-6 |
8×10-6 |
500~600 |
SM~30H |
1.08~1.12
(10.8~11.2) |
637~836
(8.0~10.5) |
≥637
(≥8.0) |
223~247
(28.0~31.0) |
800~850 |
8.3~8.5 |
-0.03 |
11×10-6 |
8×10-6 |
500~600 |
SM~30U |
1.08~1.12
(10.8~11.2) |
796~859
(10.0~10.8) |
≥1990
(≥25.0) |
223~247
(28.0~31.0) |
800~850 |
8.3~8.5 |
-0.03 |
11×10-6 |
8×10-6 |
500~600 |
SM~32 |
≥1.12
(≥1.12)
|
≥557
(≥7.0) |
≥637
(≥8.0) |
≥239
(≥30.0) |
800~850 |
8.3~8.5 |
-0.03 |
11×10-6 |
8×10-6 |
500~600 |
|
| Physical Characteristics of Sintered SmCo |
Tc
Curie Temp |
Tc |
℃ |
800~850 |
Thermal
Expansion
Coefficient |
C// |
1/℃ |
~8×10-5 |
ρ
Density |
D |
g/cm3 |
8.3~8.5 |
C⊥ |
1/℃ |
~11×10-5 |
μrec
Recoil permeability |
μrec |
|
1.00~1.05 |
Bending Strength |
N/m2 |
~1.5×108 |
Max. Operating Temp |
T.max |
℃ |
350 |
Compressive Strength |
N/m2 |
~8×108 |
Electrical
Resistivity |
|
Ω.Cm |
~8.6×103 |
Tensile Strength |
N/m2 |
~3.5×107 |
Vicker |
Hv |
|
500~600 |
Young’s Modulus |
N/m2 |
~1.2×1011 |
Thermal Permeability |
|
W/mK |
~12 |
Ha
Magnetizing Field |
Ka/m |
≥1600 |
|
| Typical Curve |
 |
 |
 |
