Introduction: Samarium Cobalt magnets (also known as SmCo magnets) are another type of permanent magnet. A big advantage of SmCo magnets is that they can operate at temperatures up to 300C. SmCo magnets are widely used in applications in which high operating temperature and high corrosion and oxidation resistance are crucial.
SmCo magnet, generally written as SmCo5 and Sm2Co17, is prepared by powder metallurgy. Currently, this magnetic material is second only to NdFeB. The advantages of SmCo include high magnetic stability, temperature resistance, and excellent anti-corrosion performance, which make it a perfect alternative for sintered NdFeb magnets under a particular environment. But the hardness and brittleness of SmCo limit its processability.
Physical Properties of SmCo Magnets
|
Parameter |
Unit |
Parameter Range |
|
Curie Temperature |
℃ |
700-800 |
|
Maximum Working Temperature |
℃ |
250 |
|
Electrical Resistivity |
KΩ.cm |
50-90 |
|
Hardness |
HV |
450-600 |
|
Density |
g/cm3 |
8.0-8.5 |
|
Relative Recoil Permeability |
urec |
1.1 |
|
Saturation Magnetization |
kOe |
>37.5 |
|
kA/m |
>3.000 |
|
Temperature Coefficient of Remanence |
%/℃ |
-0.050- -0.03 |
|
Temperature Coefficient of iHc |
%/℃ |
-0.25- -0.19 |
|
Compression Strength |
N/Mm2 |
|
|
Flexural Strength |
N/Mm2 |
|
|
Young’s Modulus |
KN/Mm2 |
|
|
Elongation |
% |
|
Size Range of SmCo Magnets
|
Shape |
Grade |
Range |
|
Disc |
26M |
Diameter: 2mm-10mm, Thickness: 1/16''-3/8'' |
|
Block |
26M |
Legth: 3/8''-2'' ,Width: 3/8''-1/2'', Thickness:1/16''-1/2'' |
|
Ring |
26M |
Diameter: 10mm- 25mm Thickness: 5mm-20mm |
|
Rod |
26M |
Diameter: 5mm- 6mm Thickness: 6mm-10mm |
|
Pot |
26M |
Diameter: 25 mm, Thickness: 10mm |
Samarium Cobalt Magnet Performance
|
Magnets |
Serial Number |
Coefficient of Remanence |
Coercivity Force |
Intrinsic Coercivity |
Maximum Magnetic Energy Product |
|
Br(mT) |
Br(kGs) |
bHc(kA/m) |
bHc(kOe) |
iHc(kA/m) |
iHc(kOe) |
(BH)max |
B(H)max (MGOe) |
|
(KJ/m2) |
|
SmCo5 |
S16 |
750-800 |
7.5-8.0 |
557-637 |
7.0-8.0 |
>=1989 |
>=25 |
111-143 |
14-18 |
|
S18 |
800-930 |
8.0-9.3 |
597-677 |
7.5-8.5 |
>=1432 |
>=18 |
127-159 |
16-20 |
|
S20 |
850-980 |
8.5-9.8 |
597-677 |
7.5-8.5 |
>=1271 |
>=16 |
143-175 |
18-22 |
Sm2C017 |
S180 |
900-1030 |
9.0-10.3 |
597-677 |
7.5-8.5 |
>=1194 |
>=15 |
127-159 |
16-20 |
|
S22A |
900-1030 |
9.0-10.3 |
613-633 |
7.7-8.7 |
>=1989 |
>=25 |
159-191 |
20-24 |
|
S22B |
900-1030 |
9.0-10.3 |
613-693 |
7.7-8.7 |
>=1432 |
>=18 |
159-191 |
20-24 |
|
S24 |
980-1080 |
9.0-10.8 |
636-716 |
8.0-9.0 |
>=1432 |
>=18 |
175-207 |
22-26 |
|
S26A |
1000-1130 |
10.0-11.3 |
676-756 |
8.5-9.5 |
>=1194 |
>=15 |
191-223 |
24-28 |
|
S26B |
1000-1130 |
10.0-11.3 |
676-756 |
8.5-9.5 |
>=796 |
>=10 |
191-223 |
24-28 |
|
S28 |
1000-1130 |
10.0-11.3 |
716-796 |
9.0-10.0 |
>=1432 |
>=18 |
207-239 |
26-30 |
|
S27 |
1000-1100 |
10.0-11.0 |
357-516 |
4.5-6.5 |
>=413 |
>=5.2 |
183-233 |
24-28 |
|
S30 |
1100-1200 |
11.0-12.0 |
438-517 |
5.5-6.5 |
>=454 |
>=5.7 |
223-255 |
28-32 |
Production Process of SmCo Magnets
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