Product Overview
SmCo magnets are high‑performance permanent magnets made from samarium (Sm) and cobalt (Co), often with additional elements (Cu, Fe, Zr) depending on grade. These magnets belong to the rare‑earth magnet family and stand out for their thermal stability, high coercivity (resistance to demagnetization), and suitability in extreme environments.
At MAG SPRING®, we supply premium SmCo magnets designed for demanding applications—whether high temperature, harsh environment, or precision instrumentation. Our SmCo offerings combine top‑tier material science with flexible manufacturing and customization to meet your specific requirements.
Material Characteristics & Performance Advantages
Extreme Thermal Stability
SmCo magnets maintain magnetic performance at elevated temperatures far beyond many other magnet types. Some SmCo grades have maximum working temperatures above 300 °C, with Curie temperatures (loss of magnetic ordering) up to ~700–800 °C.This makes them the preferred choice for high-temperature applications in permanent magnetic separation.
Superior Resistance to Demagnetization
Due to high coercivity, SmCo magnets resist loss of magnetization even under adverse fields or reversed magnetic exposure.
Corrosion and Environmental Resilience
SmCo alloys exhibit good corrosion resistance, often eliminating the need for extra protective coatings in moderately harsh environments.
High Magnetic Performance in Compact Size
Although not always reaching the absolute highest flux densities of some neodymium magnets, SmCo magnets deliver excellent performance when size‑ or weight‑constraints matter, particularly under challenging conditions.
Manufacturing Flexibility & Customization
SmCo magnets are available in various grades (SmCo 5, Sm₂Co₁₇ series) and can be custom shaped (blocks, rings, discs, special geometries) to your design.
SmCo magnets offer superior high-temperature stability, reliability, and long-term performance, making them the preferred choice for high-temperature applications in permanent magnetic separation.
Grades & Specifications
At MAG SPRING®, our SmCo magnets span multiple grades to match distinct application demands:
- Grade Types: The two main structure series are SmCo 5 (1:5 ratio) and Sm₂Co₁₇ (2:17 ratio). The 2:17 series offers higher energy products and higher maximum operating temperatures.
- Typical Magnetic Values: The maximum energy product (BHₘₐₓ) for SmCo magnets ranges roughly from 15 MGOe up to 35 MGOe, depending on grade.
- Operating Temperature: Many SmCo magnets can function continuously at 250–350 °C or more. Some high‑grade versions can exceed ~500 °C in specialized use.
- Shapes & Processing: Standard shapes such as blocks, discs, rings, and custom geometries. Wet grinding is commonly used due to brittleness; magnets must be handled carefully.
- Material properties (summary): Density ~8.3–8.5 g/cm³; lower mechanical toughness (brittle) — handling & design must consider this.
At MAG SPRING®, we support typical off‑the‑shelf grades as well as specially tailored grades for ultra‑high temperature, ultra‑low temperature coefficient, or specific mechanical/thermal requirements.
Application Fields
SmCo magnets are used in high‑end, performance‑critical sectors, including:
- High‑Temperature Motors & Generators: Electric motors in harsh environments (for automotive, industrial, energy‑generation) relying on SmCo’s thermal stability.
- Precision Instruments & Sensors: Magnetic sensors, gyroscopes, measurement instruments where field stability over temperature is vital.
- Medical & Imaging Equipment: MRI, medical pumps or equipment requiring reliable magnet performance under varied conditions.
- Industrial Extreme Environments: Drilling, downhole tools, harsh chemical or temperature conditions where robust magnets are needed.
- Automotive & EV Applications: In powertrain or high‑speed motor modules where heat, size, and magnetic performance matter.
- High-temperature permanent magnetic separators: hot material conveyors, dryer outlets, kilns, and high-temperature powder handling.
Customization & Technical Support
At MAG SPRING®, we offer full customization services for SmCo magnets:
- Shape & Size Customization: Blocks, rings, discs, complex 3D geometries per your drawing or sample.
- Machining & Finishing: Precision tolerances, holes, slots, chamfers, coatings if required.
- Grade Selection Support: We assist you in choosing the correct SmCo grade for your application: temperature, demagnetization margin, size constraints.
- Magnetization Direction Advice: Guidance on magnetization axis (axial, radial, diametric) for your magnetic circuit.
- Testing & Quality Assurance: Magnetic properties, temperature performance, mechanical integrity are verified.
- Prototype & Batch Production: Fast sample delivery, scale‑up to volume manufacturing.
- Documentation: Material certificates, magnetic performance datasheets, handling & installation guidelines.
Why Choose MAG SPRING® for SmCo Magnets
- Expertise & Quality: With deep experience in magnet materials and manufacturing, we bring you high‑performance SmCo magnet solutions, reliably delivered.
- Performance‑Driven: Our SmCo magnets are designed for the toughest environments—delivering the thermal, magnetic and mechanical stability needed for advanced applications.
- Flexible Customization: From standard sizes to highly customized parts, we tailor to your needs.
- Technical Support: We go beyond supply—engineering advice, magnet circuit consultation, installation best practices.
- Design for Life: Considering brittleness, heat‑cycling, demagnetization, we ensure your SmCo magnet choice will last and perform in real‑world use.
Why Choose SmCo Magnets for High-Temperature Permanent Magnetic Separators?
In industries where high-temperature ferromagnetic contamination is a challenge, choosing the right magnetic material is crucial. SmCo magnets offer superior high-temperature stability, ensuring that high-temperature permanent magnetic separators continue to deliver effective iron removal performance, even in environments where NdFeB magnets may fail.
For applications involving hot material handling, dryer outlets, or high-temperature powder conveyance, SmCo magnets are the ideal solution to ensure consistent and reliable iron contamination control.
Advantages of SmCo Magnets in High-Temperature Magnetic Separators
1. Exceptional High-Temperature Stability
Unlike NdFeB magnets, which lose magnetic performance above 80–150°C, SmCo magnets retain their magnetic properties in high-temperature environments. They can effectively operate at 250–350°C and beyond, making them perfect for high-temperature applications, such as drying lines, baking processes, and hot material handling.
2. Reliability in Extreme Heat
SmCo magnets have high coercivity, which means they are less likely to lose their magnetism even in high-temperature environments. Whether in high-temperature powder transport lines or hot material transfer pipes, SmCo magnets ensure long-lasting magnetic performance without compromising separation efficiency.
3. Longer Service Life for Equipment
Traditional NdFeB magnets may experience significant performance degradation in high temperatures, leading to more frequent maintenance and higher replacement costs. In contrast, SmCo magnets reduce the likelihood of magnetic loss, thus extending the service life of permanent magnetic separators and ensuring reliable operation for extended periods.
SmCo Magnets vs NdFeB Magnets: High-Temperature Performance Comparison
| Feature | SmCo Magnets | NdFeB Magnets |
|---|---|---|
| Operating Temperature | 250–350°C or higher | 80–150°C |
| Resistance to Demagnetization | Extremely strong, suitable for high-temperature environments | Loses magnetism at high temperatures |
| Corrosion Resistance | Excellent, ideal for harsh environments | Requires extra coating for protection |
| Applications | High-temperature PMS, heat-processing applications | Common temperature applications in various industries |
Ordering & Installation Guidance
Here are some recommendations to ensure you get the full benefit of SmCo magnets:
- Define Application Environment
‑ Specify operating temperature range, environment (humidity, corrosion), mechanical loads, expected demagnetizing fields. - Select Appropriate Grade
‑ For ultra‑high temps or harsh demag fields, choose a higher grade of SmCo (e.g., Sm₂Co₁₇ series). - Determine Geometry & Magnetization Direction
‑ Provide CAD drawings or technical sketch with desired shape, tolerances, magnetization direction. - Consider Mechanical & Thermal Constraints
‑ As SmCo magnets are brittle, account for mounting stress, thermal expansion, shock. Use appropriate fixtures and avoid mechanical loads that can crack the magnet. - Installation & Magnetization
‑ Magnetize after machining if required. Ensure safe handling and correct orientation in the circuit. - Testing & Validation
‑ Test in your actual application environment (temperature cycling, field stability). - Packaging & Transport
‑ SmCo magnets can be sensitive to mechanical impact. We ensure appropriate packaging to prevent damage or chipping.
FAQ
Q: What is the maximum operating temperature of SmCo magnets?
A: Many SmCo magnets can operate continuously at 250 °C to 350 °C or higher; some custom grades are designed for >500 °C.
Q: How do SmCo magnets compare to NdFeB magnets?
A: While NdFeB magnets often have higher surface flux density, SmCo magnets offer superior thermal stability, higher coercivity (less prone to demagnetization), and better performance in high‑temperature or harsh environments.
Q: Are SmCo magnets corrosion resistant?
A: Yes — SmCo alloys have strong corrosion resistance in many environments; however, in extremely aggressive chemical environments a protective coating may still be required.
Q: Can you supply custom SmCo magnet shapes and sizes?
A: Absolutely. MAG SPRING® offers custom machining, shapes, magnetization directions and special grades tailored to your design.
Q: What must I watch out for when using SmCo magnets?
A: Key considerations: brittleness (avoid mechanical impact/shock), proper mounting to allow for thermal expansion, ensuring magnetization direction aligns with your design, and protecting from strong reverse magnetic fields if applicable.
Q:What are High-Temperature Magnetic Separators?
High-temperature magnetic separators are designed to handle high-heat environments, ensuring stable performance even in extreme conditions. SmCo magnets are specifically used in these separators for high-temperature iron removal and effective contamination control.
Conclusion
If you’re looking for a high‑performance, high‑reliability magnet solution for extreme conditions—temperature, environment, precision—look to MAG SPRING® SmCo (Samarium‑Cobalt) magnets. With industry‑leading material characteristics, customization capability and expert support, we’re ready to help you engineer the right magnet solution. Contact us today for quotes, technical consultation and sample delivery.
Samarium Cobalt (SmCo) Rare-Earth Permanent Magnets
• Ultimate corrosion resistance: Works without coating in most harsh or humid environments.
• Extreme temperature stability: Standard grades up to 350 °C, special grades up to 550 °C.
• Two alloy families to choose from:
– SmCo5 (1:5) – easier to machine, ideal for thin disks & complex shapes.
– Sm2Co17 (2:17) – higher energy (BHmax 20-35 MGOe), best for aerospace, motors & sensors.
• Available in the widest size range on the market:
– Largest block: 130 × 130 × 100 mm
– Smallest disc: Φ1 × 1 mm
• Tight-angle magnetization: <1° magnetic deviation available for precision assemblies.
• No Dy or Tb required—stable raw-material pricing compared to NdFeB.
• Optional coatings: Ni, Zn, Epoxy to reduce chipping during automatic handling.
Send us your drawing or tell us the working temperature, energy requirement and quantity, we will quote within 24 hours.
SmCo Magnet Quick-Choice Matrix
| Series | Typical Grade Range | BHmax (MGOe) | Max Working Temp. (°C) | Key Features | Best-fit Applications |
| SmCo5 | 16–25 | 16–25 | 250 | Easier to machine; less brittle; saturation ≈ 4 T premium price | Thin disks, miniature rings, complex micro-shapes |
| Sm2Co17 | 20–35 | 20–35 | 350 | Highest energy at high temp; very brittle; may need plating | Aerospace, high-temp motors, sensors, magnetic couplings |
Quick Guide
• Need intricate shapes or minimal machining risk → choose SmCo5
• Need maximum energy at ≥ 300 °C → choose Sm₂Co₁₇
• Both series require careful handling; Sm₂Co₁₇ needs ≥ 6 T for full saturation.
Related Products
If you’re interested in SmCo magnets, you might also find these related products valuable for your applications. MAG SPRING® offers a range of magnetic materials with varying properties to suit different needs.
1. NdFeB Magnets (Neodymium Iron Boron)
Neodymium magnets are the most powerful type of permanent magnet and are ideal for applications requiring high magnetic strength. These magnets offer higher magnetic energy product (BHmax) but may not be suitable for high-temperature applications.
Key Benefits: Higher magnetic strength, compact size, efficient for motors, and sensors.
Explore Neodymium Magnets →
2. AlNiCo Magnets (Aluminum Nickel Cobalt)
AlNiCo magnets are known for their high-temperature resistance and stable magnetic properties over time. Ideal for applications such as electric motors, sensors, and guitar pickups. They are perfect for environments where temperature stability is critical.
Key Benefits: Superior high-temperature performance, high resistance to corrosion.
Explore AlNiCo Magnets →
3. Ceramic (Ferrite) Magnets
Ceramic magnets are a cost-effective solution for applications where high magnetic strength is not necessary. These magnets are often used in small motors, loudspeakers, and magnetic assemblies.
Key Benefits: Affordable, non-corrosive, good for high-volume applications.
Explore Ceramic Magnets →
4. Magnetic Separators
If you need high-performance magnetic solutions for industrial use, MAG SPRING® also offers a range of magnetic separators that can help with metal separation, purifying processes, and enhancing the efficiency of your systems.
Key Benefits: Effective for metal contamination control in production processes, customizable sizes and power levels.
Explore Magnetic Separators →
5. Custom Magnet Solutions
Not finding exactly what you need? MAG SPRING® provides custom magnet design and manufacturing services. Whether you need a specific shape, material, or performance requirement, our engineers can create the perfect magnet solution for your needs.
Key Benefits: Tailored to your exact specifications, high-performance materials, expert engineering support.
Explore Custom Magnet Solutions →
