neodymium(NdFeB) magnets, samarium cobalt(SmCo5, Sm2Co17)magnets, Alnico magnets, permanent rare earth magnets.
NCMag™ supplier of SmCo(rings, blocks, discs) magnets; manufacturer of samarium cobalt (cylinders, segments, rods) magnets in china.

what's SmCo(SmCo5, Sm2Co17) magnets? where's samarium cobalt(SmCo1:5, SmCo2:17) manufacturer? how to buy rare earth SmCo magnets?

Samarium Cobalt (SmCo) is the other Rare Earth magnet! SmCo is the alternative to Neodymium magnets when a more stable output over a much wider temperature range is required.

Sintered Samarium Cobalt rare-earth (SmCo) magnets are manufactured by using powder metallurgy techniques which include stringent process controls and complicated heat treatment cycles. The composition of this 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 tosaturate. The 2:17 offers a better performance & lower temperature coefficient, however it is slightly more expensive and requires very high fields to magnetise it.

The SmCo magnets can be used from temperatures nearly as low as absolute zero (-273°C) up to +350°C. Although Neodymium magnets provide stronger fields at room temperature, SmCo starts to outperform at temperatures above +150°C.

The 2:17 grade is the most popular and is readily available from stock in a disc or block format. Non standard sizes can be sliced or ground at short notice to suit customers' dimensional specifications. Being extremely brittle, great care must be taken when handling magnetised Samarium Cobalt to prevent personal injury or damage to the magnets.

grades of samarium cobalt SmCo magnets

samarium cobalt SmCo(SmCo5, Sm2Co17) magnets
Grade Br Hcb Hcj BHmax Density Tw Max Remark
kGs mT kA/m kOe kA/m kOe KJ/m3 MGOe g/cm3
SmCo16 8.3 830 640 8.0 1430 18.0 128 16.0 8.3 250 1:5
SmCo18 8.8 880 680 8.5 1430 18.0 144 18.0 8.3 250
SmCo20 9.2 920 700 8.7 1430 18.0 160 20.0 8.3 250
SmCo22 9.4 940 730 9.1 1450 18.0 176 22.0 8.3 250
SmCo24 9.8 980 730 9.1 1450 18.0 192 24.0 8.4 300 2:17
SmCo26 10.3 1030 760 9.5 1450 18.0 208 26.0 8.4 300
SmCo28 10.5 1050 780 9.7 1450 18.0 224 28.0 8.4 300
SmCo30 11.0 1100 810 10.1 1450 18.5 240 30.0 8.4 300
SmCo26M 10.5 1050 760 9.5 1100 15.0 208 26.0 8.4 300
SmCo26M 10.5 1050 780 9.7 1100 15.0 224 28.0 8.4 300
SmCo30M 11.0 1100 810 10.1 1100 15.0 224 30.0 8.4 300
SmCo28L 10.5 1050 550 6.9 700 8.0 224 28.0 8.4 250
SmCo30L 11.0 1100 550 6.9 700 8.0 240 30.0 8.4 250
SmCo24H 10.0 1000 720 9.0 2000 25.0 192 24.0 8.4 350
SmCo26H 10.3 1030 760 9.5 2000 25.0 208 26.0 8.4 350
SmCo28H 10.5 1050 770 9.6 2000 25.0 224 28.0 8.4 350
SmCo30H 10.8 1080 810 10.1 2000 25.0 240 30.0 8.4 350
Total 17samarium cobalt magnets, SmCo(SmCo5, Sm2Co17) magnets

With superior temperature coefficients than Neodymium, magnetic output from SmCo varies less over a change in temperature, making it an ideal choice for temperature sensitive applications such as sensors and loudspeakers where stability of the field during operation is important. SmCo also has a very good intrinsic coercivity allowing it to be used in applications where high external demagnetising forces may be present, such as the starting of an electric motor.

SmCo has very little free iron in its structure meaning it offers excellent corrosion resistance to water. It very rarely requires protective coating. Because of its performance characteristics SmCo is often used instead of Neodymium in mission critical applications such as aerospace and military applications. SmCo is a brittle material and could break, chip, snap or possibly even shatter if mishandled. Care should be taken when assembling with the SmCo.

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