Sintered Samarium Cobalt Magnet

sintered smco magnets

Sintered Samarium Cobalt (SmCo) magnets are manufactured by using powder metallurgy techniques, which include stringent process controls and complicated heat treatment, cycles. The composition of this Sintered SmCo magnets alloy is approximately 35% Samarium, 60% cobalt with the balance being Fe & Cu. By varying the percentages of this composition and changing the sintering & heat treatment cycles the two grades 1:5 & 2:17 are produced. The difference between them is in energy product, temperature coefficient and magnetisation force required to saturate. The 2:17 Sintered SmCo magnets (most popular) offers a better performance & lower temperature coefficient, however it is slightly more expensive and requires very high fields to magnetise it.

Features of Sintered SmCo Magnet:

An alloy compose of SmCo5/Sm2Co17; Limited raw material supply result high in cost; High resistance to demagnetization; Energy products go up to 32 MGOe, suitable for using in a temperature of over 100 C to 350C or hostile environments; Various shapes and dimensions can be met; low temperature coefficient; High performance and Extremely brittle; Outstanding thermal stability; Excellent resistance to corrosion and oxidation, no coating is needed for surface protecting.

Applications of Sintered SmCo Magnet:

Sintered Samarium Cobalt magnet is suitable for machines with high magnetic requirements Good for strict working environment requirement. robotics, machine tools to relays sensors, UHV magnetrons, motors, watch, transducers, instruments, positional detector, generators, radar and so on. Electronic magnetron, Magnetic Transmission, Magnetic Treatment, Magnistor, Etc.

Grade Residual Fulx Br Coercive Force Hcb Intrinsic Coercive force Hcj Max. Energy Product (BH) max
mT kGs kA/m koe kA/m koe kJ/m3 MGoe
SMCO 1:5 SmCo5-YX16 750~880 7.5~8.8 597±40 7.5±0.5 ≥1591 ≥20.0 127±16 16±2
SmCo-YX16A 750~880 7.5~8.8 597±40 7.5±0.5 ≥1989 ≥25.0 127±16 16±2
SmCo-YX16B 750~880 7.5~8.8 597±40 7.5±0.5 ≥2386 ≥30.0 127±16 16±2
SmCo-YX18A 800~930 8.0~9.3 637±40 8.0±0.5 ≥1591 ≥20.0 143±16 18±2
SmCo-YX18T 800~930 8.0~9.3 637±40 8.0±0.5 ≥1591 ≥20.0 143±16 18±2
SmCo-YX18B 800~930 8.0~9.3 637±40 8.0±0.5 ≥1989 ≥25.0 143±16 18±2
SMCO 2:17 SmCo-YX20 900~950 9.0~9.5 ≥670 8.5~9.2 ≥1591 ≥20.0 159±16 20±2
SmCo-YX20A 900~980 9.0~9.8 637±40 8.0±0.5 ≥1989 ≥25.0 159±16 20±2
SmCo-YX22 900~1030 9.0~10.3 653±40 8.2±0.5 ≥1432 ≥18.0 175±16 22±2
SmCo-YX22A 900~1030 9.0~10.3 653±40 8.2±0.5 ≥1989 ≥25.0 175±16 22±2
SmCo-YX24 950~1080 9.5~10.8 676±40 8.2±0.5 ≥1432 ≥18.0 191±16 24±2
SmCo-YX24A 1000~1100 10.0~11.0 676±40 8.2±0.5 ≥1989 ≥25.0 191±16 24±2
SmCo-YX26 1000~1130 10.0~11.3 357~516 4.5~6.5 413~556 5.0~7.0 207±16 26±2
SmCo-YX26A 1000~1130 10.0~11.3 716±40 9.0±0.5 ≥796 ≥10.0 207±16 26±2
SmCo-YX26B 1000~1130 10.0~11.3 716±40 9.0±0.5 ≥1194 ≥15.0 207±16 26±2
SmCo-YX26C 1000~1130 10.0~11.3 716±40 9.0±0.5 ≥1591 ≥20.0 207±16 26±2
SmCo-YX26D 1000~1080 10.0~10.8 ≥732 9.0~10.5 ≥2300 ≥30.0 207±16 26±2
SmCo-YX28 1060~1180 10.6~11.8 357~516 4.5~6.5 413~556 5.0~7.0 223±16 28±2
SmCo-YX28A 1060~1180 10.6~11.8 763±40 9.6±0.5 ≥796 ≥10.0 223±16 28±2
SmCo-YX28B 1050~1150 10.5~11.5 ≥750 9.4~9.8 ≥960 ≥12.0 223±16 28±2
SmCo-YX28C 1060~1180 10.6~11.8 763±40 9.6±0.5 ≥1194 ≥15.0 223±16 28±2
SmCo-YX30 1100~1200 11.0~12.0 438~597 5.5~6.5 454~597 5.7~7.5 238±16 30±2
SmCo-YX30A 1100~1200 11.0~12.0 ≥560 7.0~8.5 ≥716 ≥12.0 238±16 30±2
SmCo-YX30B 1100~1200 10.8~11.2 796-859 10.0-10.8 ≥1990 ≥25.0 223-247 28.0-31.0
SmCo-YX32 ≤1120 ≤11.2 ≤557 ≥7.0 ≥637 ≥8.0 ≥239 ≥30.0
Characteristics & application of Samarium Cobalt permanent magnet
Curie Temp. Tc 800-850 Coeff. of thermal expansion C// 1/℃ ~8×10-5
Density D g/cm3 8.3~8.5 C⊥ 1/℃ ~11×10-5
Recoil Permeability μrec   1.00~1.05; Rigidity strength N/m2 ~1.5×108
Max. Working Temp. Tmax 350 Compress strength N/m2 ~8×108
Electrical Resistivity Ω.Cm 8.6×105 Tensile stength N/m2 ~3.5×107
Vickers Hardness Hv   500~600 Young's Modulus N/m2 ~1.2×1011
Thermal Conduct rate   W/mK ~12 Magnetization field Ha kA/m ≥1600

Typical Demagnetization Curves of Samarium Cobalt Magnets

SmCo5 Demagnetization Curve YX 18A
SmCo5 Demagnetization Curve YX 18A
Hysteresgraph loop Sm2Co17 YX 26A
Sm2Co17 Demagnetization Curve YX 26A
Hysteresgraph loop Sm2Co17 YX 28A
Sm2Co17 Demagnetization Curve YX 28A
Sm2Co17 Demagnetization Curve YX 30A
Sm2Co17 Demagnetization Curve YX 30A