Sintered Sm2Co17 samarium cobalt magnet
Samarium cobalt magnets are composed of samarium, cobalt and iron. These rare earth magnets are extremely strong for their small size, metallic in appearance and found in simple shapes such as rings, blocks and discs.
According the composition, we divide two of SMCO: Sm2CO17 and SmCo5
According the process, we divide to sintered Smco and bonded Smco
Sm2Co17:
The (BH)max between 20-32, the maximum operating temperature can be reached 350 °C, the 2:17 has a low temperature coefficient (-0.02% / ℃) and good corrosion resistance, magnetic properties is more than NdFeB magnets when in high working temperatures,
Sm2co17: not only has a high intrinsic saturation magnetic induction, but also good anti-oxidation.
The Curie temperature is high to 840-870 degrees, higher than Smco5.
The disadvantage is that the process is complex with high costs.
Materials | Grade | Br (Residual induction) | Hcb (Coercive Force) | Hcj (Intrinsic coercive Force) | (BH)max. Max. Energy Product | Max. Operating Temp. | TC Curie Temp. |
(KGs) | (KOe) | (KOe) | (MGOe) | (°c) | (°c) | ||
Sm2Co17 | YXG-24H | 9.5-10.2 | 8.7-9.6 | ≥25 | 22-24 | 350 | 800 |
Sm2Co17 | YXG-26H | 10.2-10.5 | 9.4-10.0 | ≥25 | 24-26 | 350 | 800 |
Sm2Co17 | YXG-28H | 10.3-10.8 | 9.5-10.2 | ≥25 | 26-28 | 350 | 800 |
Sm2Co17 | YXG-30H | 10.8-11.0 | 9.9-10.5 | ≥25 | 28-30 | 350 | 800 |
Sm2Co17 | YXG-32H | 11.0-11.3 | 10.2-10.6 | ≥25 | 29-32 | 350 | 800 |
Sm2Co17 | YXG-22 | 9.3-9.7 | 8.5-9.3 | ≥18 | 20-23 | 300 | 800 |
Sm2Co17 | YXG-24 | 9.5-10.2 | 8.7-9.6 | ≥18 | 22-24 | 300 | 800 |
Sm2Co17 | YXG-26 | 10.2-10.5 | 9.4-10.0 | ≥18 | 24-26 | 300 | 800 |
Sm2Co17 | YXG-28 | 10.3--10.8 | 9.5-10.2 | ≥18 | 26-28 | 300 | 800 |
Sm2Co17 | YXG-30 | 10.8-11.0 | 9.9-10.5 | ≥18 | 28-30 | 300 | 800 |
Sm2Co17 | YXG-32 | 11-11.3 | 10.2-10.7 | ≥18 | 29-32 | 300 | 800 |
Sm2Co17 | YXG-26M | 10.2-10.5 | 8.5-9.8 | 12-18 | 24-26 | 300 | 800 |
Sm2Co17 | YXG-28M | 10.3-10.8 | 8.5-10.0 | 12-18 | 26-28 | 300 | 800 |
Sm2Co17 | YXG-30M | 10.8-11.0 | 8.5-10.5 | 12-18 | 28-30 | 300 | 800 |
Sm2Co17 | YXG-32M | 11.0-11.3 | 8.5-10.6 | 12-18 | 29-32 | 300 | 800 |
Sm2Co17 | YXG-24L | 9.5-10.2 | 6.8-9.0 | 8-12 | 22-24 | 250 | 800 |
Sm2Co17 | YXG-26L | 10.2-10.5 | 6.8-9.4 | 8-12 | 24-26 | 250 | 800 |
Sm2Co17 | YXG-28L | 10.3-10.8 | 6.8-9.6 | 8-12 | 26-28 | 250 | 800 |
Sm2Co17 | YXG-30L | 10.8-11.5 | 6.8-10.0 | 8-12 | 28-30 | 250 | 800 |
Sm2Co17 | YXG-32L | 11.0-11.5 | 6.8-10.2 | 8-12 | 29-32 | 250 | 800 |
(SmEr)2(CoTM)17 | LTC(YXG-22) | 9.4-9.8 | 8.4-9.0 | 15-20 | 21-23 | 300 | 840 |
CE(CoFeCu) | YX-12 | 7.0-7.4 | 4.5-4.9 | 4.5-6.0 | 10-13 | 200 | 450 |
Sintered Smco auxiliary magnetic and physical properties
Item | Parameters | SmCo5 | Sm2Co17 |
Auxiliary magnetic properties | Temp. coefficient of Br (α(Br))/%/ K-1 | -0.05 | -0.03 |
Temp. coefficient. of Hcj (α(Hcj)/%/ K-1 | -0.3 | -0.3 | |
Curie Temperature (Tc)/K | 1000 | 1000 | |
Recoil Permeability (μrec) | 1.05 | 1.10 | |
physical properties | Density (g/cm-3) | 8.2 | 8.4 |
Vickers Hardness Hv/MPa | 450 | 650 | |
Electrical Resistivity (ρ/Ω•cm) | 5.3x10-5 | 8.5x10-5 | |
Compressive Strengthδc/MPa | 1000 | 800 | |
Tensile Strength δb/ MPa | 400 | 350 | |
Bending Strength δw/MPa | 180 | 150 |
Compare of the magnetic properties for permanent magnet material
item | Js/T | (BH)m /KJ.m-3 | HA /MA.m-1 | Tc/℃ | RE/TM | TM |
SmCo5 | 1.15 | 248 | 32 | 740 | 0.166 | Co |
Sm2Co17 | 1.56 | 480 | 8 | 890 | 0.105 | Co |
Nd2Fe14B | 1.61 | 528 | 6 | 310 | 0.117 | Fe |
Applications
²aerospace fields,
²military fields,
²high temperature motor,
²automotive sensors,
²variety of magnetic drive,
²magnetic drive pump,
²microwave devices.
²Computer disc drives
²Sensors
²Radar
²Traveling wave tubes
² Satellite systems
²Motors where temporary stability is vital
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