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Further reading about Samarium Cobalt Magnets can be found below.

Grade
(click to view
demagnetization
curve)
 Max Energy
Product
 Residual
Induction
 Min Intrinsic
Coercivity
 Coercivity 
 Max Operating
Temp
 Curie Temp
 Coefficient
Induction
20-150°C
 Coefficient
Coercivity
20-150°C
BHmax Br Hci Hc Tmax Tc α β
MGOe kG kOe kOe °C °C % / °C % / °C
Type 2:17
S3010
 30
 11.2
 10
 9.2
 300
 825
 -0.03
 -0.17
S2610
 26 10.5
 10
 8.8
 300
 825
 -0.03
 -0.17
S3212
 32
 11.5
 12
 10.0
 300
 825
 -0.03
 -0.17
S3012
 30
 11.3
 12
 9.8
 300
 825
 -0.03
 -0.17
S2612
 26
 10.6
 12
 9.4
 300
 825
 -0.03
 -0.17
S2212
 22
 9.9
 12
 9.0
 300
 825
 -0.03
 -0.17
S3315
 33
 11.7
 15
 10.7
 300
 825
 -0.03
 -0.22
S3215
 32
 11.5
 15
 10.5
 300
 825
 -0.03
 -0.22
S3015
 30
 11.3
 15
 10.3
 300
 825
 -0.03
 -0.22
S2816
 28
 11.0
 16
 10.3
 300
 825
 -0.03
 -0.22
S2616
 26
 10.8
 16
 10.1
 300
 825
 -0.03
 -0.22
S3218
 32
 11.6
 18
 10.8
 300
 825
 -0.03
 -0.22
S3018
 30
 11.3
 18
 10.6
 300
 825
 -0.03
 -0.22
S2618
 26
 10.7
 18
 10.1
 300
 825
 -0.03
 -0.22
S2820
 28
 11.0
 20
 10.4
 300
 825
 -0.03
 -0.22
S2620
 26
 10.8
 20
 10.3
 300
 825
 -0.03
 -0.22
S3022
 30
 11.3
 19
 10.5
 300
 825
 -0.03
 -0.22
S2825
 28
 11.1
 25
 10.5
 300
 825
 -0.03
 -0.22
S2625
 26
 10.8
 25
 10.2
 300
 825
 -0.03
 -0.22
S2425
 24
 10.3
 25
 9.8
 350
 825
 -0.03
 -0.22
S2225
 22
 9.7
 25
 9.2
 350
 825
 -0.03
 -0.22
S2830
 28
 11.0
 30
 10.5
 350
 825
 -0.03
 -0.22
S2630
 26
 10.8
 30
 10.3
 350
 825
 -0.03
 -0.22
S2430
 24
 10.3
 30
 9.8
 350
 825
 -0.03
 -0.22
S2230
 22
 9.7
 30
 9.3
 350
 825
 -0.03
 -0.22
S2435
 24
 10.3
 35
 9.9
 350
 825
 -0.03
 -0.22
S2235
 22
 9.7
 35
 9.3
 350
 825
 -0.03
 -0.22
Type 1:5
S2415
 24
 10.0
 15
 9.3
 250
 750
 -0.05
 -0.22
S2215
 22
 9.5
 15
 8,8
 250
 750
 -0.05
 -0.22
S2418
 24
 10.0
 18
 9.4
 250
 750
 -0.05
 -0.22
S2218
 22
 9.5
 18
 9.0
 250
 750
 -0.05
 -0.22
S2018
 20
 9.0
 18
 8.5
 250
 750
 -0.05
 -0.22
S1818
 18
 8.6
 18
 8.2
 250
 750
 -0.05
 -0.22
S2220
 22
 9.5
 20
 9.1
 250
 750
 -0.05
 -0.22
S2020
 20
 9.0
 20
 8.6
 250
 750
 -0.05
 -0.22
S1820
 18
 8.6
 20
 8.2
 250
 750
 -0.05
 -0.22
S2223
 22
 9.5
 23
 9.1
 250
 750
 -0.05
 -0.22
S2025
 20
 9.0
 25
 8.6
 250
 750
 -0.05
 -0.22
S1825
 18
 8.6
 25
 8.2
 250
 750
 -0.05
 -0.22
S2030
 20
 9.0
 30
 8.6
 250
 750
 -0.05
 -0.22

 

Typical Physical Properties - Type 2:17
Curie Temperature  800 - 825°C
*Coefficient of Thermal Expansion - Perpendicular to magnetization orientation +11.0 - +12.0 x 10-6 °C-1
*Coefficient of Thermal Expansion - Parallel to magnetization orientation  +9.0 - +10.0 x 10-6 °C-1
 Electrical Resistivity  80 - 90 µΩ·cm
 Density  8.3 - 8.4 g·cm-3
 Vicker's Hardness  550 - 650 HV
 Young's Modulus  140 - 150 kN·mm-2
 Bending Strength  0.09 - 0.15 kN·mm-2
 Compressive Strength  0.65 - 0.80 kN·mm-2

*Due to magnetostriction, all magnetic materials expand/contract at different rates, depending on magnetic orientation.

 

Typical Physical Properties - Type 1:5
Curie Temperature  720 - 750°C
*Coefficient of Thermal Expansion - Perpendicular to magnetization orientation  +12.0 - +13.0 x 10-6 °C-1
*Coefficient of Thermal Expansion - Parallel to magnetization orientation  +6.0 - +7.0 x 10-6 °C-1
 Electrical Resistivity  50 - 60 µΩ·cm
 Density  8.2 - 8.3 g·cm-3
 Vicker's Hardness  550 - 650 HV
 Young's Modulus  100 - 110 kN·mm-2
 Bending Strength  0.12 - 0.18 kN·mm-2
 Compressive Strength  0.9 - 1.0 kN·mm-2

*Due to magnetostriction, all magnetic materials expand/contract at different rates, depending on magnetic orientation.

About Samarium Cobalt

As the first commercially viable rare earth permanent magnet material, Samarium Cobalt (Sm-Co) is considered to still be the premium material for many high performance applications. Formulated in the 1960's, it came as a revolutionary product, initially tripling the energy product of other materials available at the time.

Sm-Co materials come in energy products from 16 MGOe up to 33 MGOe. Their high resistance to demagnetizing influences and excellent thermal stability has ensured Sm-Co as the premium choice for the most demanding motor applications. In addition, the corrosion resistance is significantly higher than, for example, Nd-Fe-B. It is still recommended to coat the magnet in acidic conditions. Its corrosion resistance has also offered a high degree of comfort to those looking to use magnets in medical applications.

On a 'per pound' basis, Sm-Co is the most expensive permanent magnet material. However, because of its high energy product, it has achieved considerable commercial success by decreasing the required volume of magnet material to fulfill a certain task. Sm-Co can typically be used up to 300 °C, though, of course, its actual performance at that temperature is governed strongly by the design of the magnetic circuit. As with all permanent magnet materials, extreme caution must be exercised when handling magnetized samples. Sm-Co can be prone to chipping and should not be used a structural component in an assembly.