Samarium Cobalt Magnets-Sm2Co17

Consisted of samarium and cobalt with an atomic ratio of 2:17

Samarium Cobalt Magnets-Sm<sub>2</sub>Co<sub>17</sub>
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The 2:17 samarium cobalt magnets, also known as Sm2Co17 magnets, are a high-performance magnetic material made of samarium, cobalt, copper, iron, and zirconium through melting, grinding, pressing, sintering, and aging processes. With a maximum energy product ranging from 17-35 MGOe and a high working temperature between 250℃-500℃, Sm2Co17 magnets have excellent corrosion resistance and low temperature coefficient, making them ideal for various applications in aerospace, high-temperature motors, automotive sensors, magnetic drives, pumps, and microwave devices.

Although Sm2Co17 has excellent properties, it is brittle and not easily shaped into complex shapes or thin-walled structures like round disks or rings. During the production process, it may cause minor chipping, which is acceptable as long as it does not affect the magnet's functionality. We advise users to handle with care during assembly to avoid attracting iron or other magnetic materials, which could lead to breakage or injury.

Moreover, it is not easy to saturate and magnetize 2:17 magnets. If users need to magnetize the magnets themselves, it is essential to consider the magnetic field strength of the magnetizer and select the appropriate grade.

Sintered Sm2Co17 Magnet Magnetic Properties Standard (General) Download PDF
Material Grade Br
Remanence Br		 Hcb
Coercivity Force		 Hcj Intrinsic Coercivity (BH)max Maximun Energy Tc
Curie Temperature		 Tw
Max. Operating Temperature		 Temperature Coefficient of Br α(Br) Temperature Coefficient of Hcj β(Hcj)
T KGs KA/m KOe KA/m KOe KJ/m3 MGOe ℃ ℃ ％/℃ ％/℃
Sm2(CoFeCuZr)17
YXG-24H
 0.95-1.02 9.5-10.2 692-764 8.7-9.6 ≥1990 ≥25 175-191 22-24 800 350 -0.035 -0.20
YXG-26H
 1.02-1.05 10.2-10.5 748-796 9.4-10.0 ≥1990 ≥25 191-207 24-26 800 350 -0.035 -0.20
YXG-28H
 1.03-1.08 10.3-10.8 756-812 9.5-10.2 ≥1990 ≥25 207-223 26-28 800 350 -0.035 -0.20
YXG-30H
 1.08-1.10 10.8-11.0 788-835 9.9-10.5 ≥1990 ≥25 223-239 28-30 800 350 -0.035 -0.20
YXG-32H
 1.10-1.13 11.0-11.3 812-860 10.2-10.8 ≥1990 ≥25 231-255 29-32 800 350 -0.035 -0.20
YXG-33H
 1.12-1.16 11.2-11.6 845-890 10.6-11.2 ≥1990 ≥25 239-263 30-33 800 350 -0.035 -0.20
YXG-22
 0.93-0.97 9.3-9.7 676-740 8.5-9.3 ≥1433 ≥18 160-183 20-23 800 300 -0.035 -0.20
YXG-24
 0.95-1.02 9.5-10.2 692-764 8.7-9.6 ≥1433 ≥18 175-191 22-24 800 300 -0.035 -0.20
YXG-26
 1.02-1.05 10.2-10.5 748-796 9.4-10.0 ≥1433 ≥18 191-207 24-26 800 300 -0.035 -0.20
YXG-28
 1.03-1.08 10.3-10.8 756-812 9.5-10.2 ≥1433 ≥18 207-223 26-28 800 300 -0.035 -0.20
YXG-30
 1.08-1.10 10.8-11.0 788-835 9.9-10.5 ≥1433 ≥18 223-239 28-30 800 300 -0.035 -0.20
YXG-32
 1.10-1.13 11.0-11.3 812-860 10.2-10.8 ≥1433 ≥18 231-255 29-32 800 300 -0.035 -0.20
YXG-33
 1.12-1.16 11.2-11.6 845-890 10.6-11.2 ≥1433 ≥18 239-263 30-33 800 300 -0.035 -0.20
YXG-35
 1.16-1.2 11.6-12.0 868-908 10.9-11.4 ≥1433 ≥18 255-278 32-35 800 300 -0.035 -0.25
YXG-26M
 1.02-1.05 10.2-10.5 676-780 8.5-9.8 955-1433 12-18 199-215 25-27 800 300 -0.035 -0.20
YXG-28M
 1.03-1.08 10.3-10.8 676-796 8.5-10.0 955-1433 12-18 207-220 26-28 800 300 -0.035 -0.20
YXG-30M
 1.08-1.10 10.8-11.0 676-835 8.5-10.5 955-1433 12-18 220-240 28-30 800 300 -0.035 -0.20
YXG-32M
 1.10-1.13 11.0-11.3 676-852 8.5-10.7 955-1433 12-18 230-255 29-32 800 300 -0.035 -0.20
YXG-24L
 0.95-1.02 9.5-10.2 541-716 6.8-9.0 636-955 8-12 183-199 23-25 800 250 -0.035 -0.20
YXG-26L
 1.02-1.05 10.2-10.5 541-748 6.8-9.4 636-955 8-12 199-215 25-27 800 250 -0.035 -0.20
YXG-28L
 1.03-1.08 10.3-10.8 541-764 6.8-9.6 636-955 8-12 207-220 26-28 800 250 -0.035 -0.20
YXG-30L
 1.08-1.15 10.8-11.5 541-796 6.8-10.0 636-955 8-12 220-240 28-30 800 250 -0.035 -0.20
YXG-32L
 1.10-1.15 11.0-11.5 541-812 6.8-10.2 636-955 8-12 230-255 29-32 800 250 -0.035 -0.20
2:17 Low temperature coefficient
(SmEr)2(CoTm)17
LTC(YXG-18)
 0.84-0.89 8.4-8.9 629-668 7.9-8.4 ≥1433 ≥18 135-151 17-19 840 300 -0.001 -0.25
LTC(YXG-20)
 0.89-0.94 8.9-9.4 660-708 8.3-8.9 ≥1433 ≥18 151-167 19-21 840 300 -0.007 -0.25
LTC(YXG-22)
 0.94-0.98 9.4-9.8 692-740 8.7-9.3 ≥1433 ≥18 167-183 21-23 840 300 -0.01 -0.25
High temperature SmCo Sm2(CoFeCuZr)17
HT400(YXG-26)
 0.99-1.04 9.9-10.4 740-812 9.3-10.2 ≥1830 ≥23 191-215 24-27 850 400 -0.035 -0.12
HT450(YXG-24)
 0.96-0.99 9.6-9.9 724-772 9.1-9.7 ≥1830 ≥23 175-199 22-25 850 450 -0.035 -0.12
HT500(YXG-22)
 0.93-0.97 9.3-9.7 708-756 8.9-9.5 ≥1830 ≥23 160-183 20-23 850 500 -0.035 -0.12
Calculation of Theoretical Values of Br and Hcj at High Temperature The temperature coefficients of remanence Br and intrinsic coercivity Hcj are measured at 20°C to 150°C, only for reference.
Theoretical calculation formula (T1 = room temperature (usually 20℃), T2=high temperature):
Br@T2=Br@T1-[(T2-T1)*α(Br)*Br@T1]
Hcj@T2=Hcj@T1-[(T2-T1)*β(Hcj)*Hcj@T1]
Taking YXG-28H, Br=1.03T, Hcj=1990KA/m as an example, the theoretical value at 150℃ is calculated as follows:
Br@150℃=1.03-[(150-20)*0.035%*1.03]=0.9831T
Hcj@150℃=1990-[(150-20)*0.2%*1990]=1472KA/m
Remark:
1) There will be a slight test error during the magnetic performance test, but the error rate is less than 1%. Because the roughcast are not fully inspected, the performance indicators of all grades will have individual deviations. Take the YXG-30 grade as an example, Br=10.8-11.0KGs (of which there may be less than 5% of the performance range between 10.75-11.04KGs).
2) The maximum working temperature has a lot to do with the specific working environment, load coil and other factors.
3) With the improvement of technology, the performance index may be changed, please refer to the latest version of NGYC property sheet.
Physical Properties
Item Unit Sm2Co17 Magnet
Density (D) G/Cm3 8.4
Curie Temperature (Tc) K 1100
Vickers Hardness (Hv) MPa 550-600
Compressive Strength (δc) MPa 800
Resistivity (ρ) Ω.Cm 8～9×10-5
Bending Strength (δb) Mpa 130-150
Tensile Strength (δt) Mpa 35
Coeff. of Thermal Expansion (α) (10-6/℃) ∥ 8
⊥11

Please note that the above values are for reference purposes only and should not be used as the sole basis for material acceptance or rejection.

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Q&A
You can compare your specifications with the information on our website to find the right magnetic properties or grade. Our "General Dimensions and Shapes" page can help you determine the product size you need. For more information, please click on "Technical Support."
No, each magnet is typically customized to meet the needs of our customers. We can assist you in designing the approximate size based on the product's application. Please refer to our "Standard Sizes and Shapes" page for the range of sizes we can manufacture.
Since all of our products are customized, normally we do not keep extras in stock. Therefore, we may need to make new samples when customers request them, which incurs additional costs. We may provide free samples only if we happen to have the product in stock.
  • The notation of the grade is different: SmCo5 is generally represented by YX, while Sm2Co17 is represented by YXG.
  • The composition is different: SmCo5 is mainly composed of samarium, cobalt, and praseodymium, or pure samarium cobalt without praseodymium. Sm2Co17 is mainly composed of samarium, cobalt, copper, iron, and zirconium.
  • The physical properties are different: SmCo5's maximum working temperature is 250℃, while Sm2Co17's maximum working temperature is 350-500℃. SmCo5 has better mechanical and physical properties and is easier to produce, while Sm2Co17 is more brittle.

The physical properties of samarium cobalt magnets make them brittle and prone to chipping or breaking under force. The production of one magnet involves more than ten processes, and small chips or breaks can occur during processing, inspection, transportation, or use. Therefore, we recommend that you handle and protect the magnets with great care throughout these processes. Nevertheless, small chips or breaks may still occur.

Yes, samarium cobalt magnets contain iron and can rust. However, compared to NdFeB magnets, the iron content in samarium cobalt magnets is lower, so rusting is not as severe. If the magnet is used in seawater, some rust spots may appear on the surface, but this does not affect its performance or usage.

Samarium Cobalt magnets have good corrosion resistance, so they generally do not need to be plated. However, some customers may require plating for cosmetic purposes or if the application environment is harsh. We can provide a variety of plating types, including zinc, nickel, silver, copper, chemical nickel, nickel-copper-nickel, nickel-gold, nickel-tin, epoxy, and more.

The price of SmCo5 is higher than Sm2Co17 because SmCo5 contains more cobalt, and cobalt is a rare metal, making it very expensive. Therefore, although the magnetic energy product of SmCo5 is lower than that of Sm2Co17, the price is higher.

Currently, the highest performance samarium cobalt magnet that we can produce is YXG-35, with the following specifications: Br = 11,600-12,000Gs; bHc = 10,900-11,400Oe; iHc ≥ 18,000Oe; (BH)max = 32-35MGOe.

We offer a wide range of permanent magnet materials to meet the diverse needs of our customers. Our offerings include Samarium Cobalt (SmCo) magnets, Neodymium Iron Boron (NdFeB) magnets, Ferrite magnets, Alnico magnets, injection molded magnets, bonded magnets, and rubber magnets, among others.

Absolutely! Our company has the complete capability to provide magnet assemblies composed of magnets and metal components. With over 600 advanced processing and precision machining equipment, we are equipped to deliver high-quality permanent magnet assemblies and plastic integrated magnets to our customers.

The need for coatings depends on the specific permanent magnet material used. Samarium Cobalt (SmCo) and Alnico magnets are corrosion-resistant and typically do not require additional coatings for enhanced protection. On the other hand, Neodymium Iron Boron (NdFeB) magnets are susceptible to corrosion and are always coated to provide effective corrosion protection. We offer three commonly used coatings for NdFeB magnets:

  • Nickel-Copper-Nickel (maximum temperature of 200°C)
  • Aluminum IVD (maximum temperature of 500°C)
  • Zinc (maximum temperature of 200°C)

The answer depends on the attributes that are important for your specific application. Different materials offer different combinations of performance characteristics. Choosing the right permanent magnet material requires careful consideration and trade-offs. Share with us your specific requirements and application details, and we will recommend the most suitable product for you.

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