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
SmCo5
SmCo5's physical character and ductibility is better than Sm2Co17,
Compare Sm2Co17, the price is higher, it is not easy brittle,The (BH) max range is from 16 to 25, maximum working-temperature 250°C. The physical character and ductibility is better than Sm2Co17, so SmCo5 is easier to be machined thin thickness disc such as very small Samarium cobalt magnets cylinder with size: D2xh2mm or ring wall and complex shapes which Sm2Co17 are difficult to make.
very small Samarium cobalt magnets cylinder with size: D2xh2mm
very small Samarium cobalt magnets cylinder with size: D2xh2mm
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
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) | ||
SmCo5 | YX-16 | 8.1-8.5 | 7.8-8.3 | 15-23 | 14-16 | 250 | 750 |
SmCo5 | YX-18 | 8.5-9.0 | 8.3-8.8 | 15-23 | 16-18 | 250 | 750 |
SmCo5 | YX-20 | 9.0-9.4 | 8.5-9.1 | 15-23 | 19-21 | 250 | 750 |
SmCo5 | YX-22 | 9.2-9.6 | 8.9-9.4 | 15-23 | 20-22 | 250 | 750 |
SmCo5 | YX-24 | 9.6-10.0 | 9.2-9.7 | 15-23 | 22-24 | 250 | 750 |
SmCo5 | YX-16s | 7.9-8.4 | 7.7-8.2 | ≥23 | 15-17 | 250 | 750 |
SmCo5 | YX-18s | 8.4-8.9 | 8.1-8.6 | ≥23 | 17-19 | 250 | 750 |
SmCo5 | YX-20s | 8.9-9.3 | 8.6-9.1 | ≥23 | 19-21 | 250 | 750 |
SmCo5 | YX-22s | 9.2-9.6 | 8.9-9.4 | ≥23 | 21-23 | 250 | 750 |
SmCo5 | YX-24s | 9.6-10.0 | 9.3-9.8 | ≥23 | 23-25 | 250 | 750 |
(SmGd)Co5 | LTc(YX-10) | 6.2-6.6 | 6.1-6.5 | ≥23 | 9.5-11 | 300 | 750 |
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 |
the magnetic properties of Samarium cobalt magnets and Neo magnets
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 |
This pic showed very small Samarium cobalt magnets cylinder with size: D2xh2mm, it is usually used in military assembly.
