Samarium Cobalt Magnets-SmCo5

Consisted of samarium and cobalt with an atomic ratio of 1:5

Samarium Cobalt Magnets-SmCo<sub>5</sub>
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The 1:5 samarium cobalt magnets, also known as SmCo5, are made by melting, grinding, pressing, and sintering a combination of rare earth metals such as samarium, cobalt, gadolinium, and praseodymium. Our 1:5 samarium cobalt magnets offer a maximum magnetic energy range of 10-25 and can withstand temperatures up to 250℃. While their maximum magnetic energy product is lower than that of our 2:17 samarium cobalt magnets, their mechanical properties and ductility are superior. This makes them easier to machine into complex shapes such as thin disks, squares, rings, and custom shapes.

Moreover, our 1:5 samarium cobalt magnets require a lower magnetizing field compared to our 2:17 samarium cobalt magnets. They can be magnetized to saturation with a field strength of only 40,000 Gauss, whereas the 2:17 magnets require a higher field strength of 60,000 Gauss or more. Although the high rare earth content in our 1:5 samarium cobalt magnets makes them relatively more expensive than the 2:17 magnets, customers can select the most suitable magnets for their application.

Sintered SmCo5 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 ℃ ℃ ％/℃ ％/℃
Pure SmCo5
YX-16s
 0.79-0.84 7.9-8.4 620-660 7.8-8.3 ≥1830 ≥23 118-135 15-17 750 250 -0.035 -0.28
YX-18s
 0.84-0.89 8.4-8.9 660-700 8.3-8.8 ≥1830 ≥23 135-151 17-19 750 250 -0.040 -0.28
YX-20s
 0.89-0.93 8.9-9.3 684-732 8.6-9.2 ≥1830 ≥23 150-167 19-21 750 250 -0.045 -0.28
YX-22s
 0.92-0.96 9.2-9.6 710-756 8.9-9.5 ≥1830 ≥23 167-183 21-23 750 250 -0.045 -0.28
YX-24s
 0.96-1.00 9.6-10.0 740-788 9.3-9.9 ≥1830 ≥23 183-199 23-25 750 250 -0.045 -0.28
1:5 Low temperature coefficient
(SmGd)Co5
LTC (YX-10)
 0.62-0.66 6.2-6.6 485-517 6.1-6.5 ≥1830 ≥23 75-88 9.5-11 750 300 Temp. Range 20-100℃ 100-200℃ 200-300℃ α(Br) +0.0156%/℃ +0.0087%/℃ +0.0007%/℃
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 YX-20s，Br=0.9T, Hcj=1830KA/m as an example, the theoretical value at 150℃ is calculated as follows:
Br@150℃=0.9-[(150-20)*0.045%*0.9]=0.8473T
Hcj@150℃=1830-[(150-20)*0.28%*1830]=1163.88KA/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.
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 SmCo5 Magnet
Density (D) G/Cm3 8.3
Curie Temperature (Tc) K 1000
Vickers Hardness (Hv) MPa 450-500
Compressive Strength (δc) MPa 1000
Resistivity (ρ) Ω.Cm 5～6×10-5
Bending Strength (δb) Mpa 150-180
Tensile Strength (δt) Mpa 40
Coeff. of Thermal Expansion (α) (10-6/℃) ∥ 6
⊥12

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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