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 |
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:
Metal samarium, cobalt, copper, iron, zirconium, according percentage to melting,grinding,profiling,sintering,aging,and make of various grades, shapes and sizes.
The (BH)max between 20-32, the maximum operating temperature can be reached 350 °C,
SmCo ring magnets not only have high intrinsic saturation magnetic induction, but also good anti-oxidation.
SmCo ring magnets not only have 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.
Sintered SmCo ring magnets 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 |
Applications
Generator
microphone
vibration sensor
ignition device
a bomb detonated
meter
magnetic recording
Traveling wave tubes
backward wave tubes
cathode ray tubes
orthogonal magnetic amplifier
klystron
microwave devices
compare of properties for rare earth magnet:
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 |
SmCo ring magnets
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