Cylindrical SmCo Magnets with Central Holes OD40xID20xH7mm
Our Cylindrical Samarium Cobalt (SmCo) Magnets with central holes (OD40xID20xH7mm) are high-performance rare-earth magnets designed for applications requiring strong magnetic properties,
excellent temperature resistance, and exceptional stability.
Key Features:
High-Temperature Resistance – Operates effectively in extreme environments, withstanding temperatures up to 350°C (662°F) without significant loss of magnetism.
Superior Magnetic Strength – Offers strong magnetic performance with high energy product and excellent coercivity.
Corrosion Resistance – Naturally resistant to oxidation and corrosion, making them ideal for harsh conditions without the need for additional coatings.
Precision Engineering – Manufactured to strict tolerances, ensuring optimal performance in precision applications.
Applications:
Motors & Generators – Used in high-performance motors, servo motors, and generators requiring reliable magnetic stability.
Aerospace & Automotive – Ideal for aerospace and automotive applications where high-temperature stability is essential.
Sensors & Instruments – Commonly used in magnetic sensing devices, scientific instruments, and positioning systems.
Magnetic Couplings & Assemblies – Integrated into mechanical systems requiring non-contact torque transmission.
At Vormag Electronics, we provide custom SmCo magnet solutions tailored to your specific needs. Contact us for more details or customized specifications!
Corrosion Resistance
SmCo magnets can usually be used in humid applications without any need for a protective coating. In wet envrironments, coating of SmCo(2:17) in NiCuNi is recommended to avoid surface corrosion issue.
The corrosion resistant of SmCo magnets are considered good, surface coating is unnecessary, but the coatings like NiCuNi, Zn, Black epoxy can be plated if required. The oxidation resistance behavior of SmCo (2:17)-type high-temperature magnets modified with Ni–Cr two-layer coating is under studied.
Excellent Temperature Stability
Samarium cobalt magnets experience a minimal change in their magnetic performance as temperature increases from ambient, far less than neodymium and ferrite (ceramic) magnets. Being part of the rare-earth magnet family, Samarium cobalt magnets rank similarly in strength to neodymium magnets but have much higher temperature stability and higher coercivity.
| Physical properties of sintered Sm-Co magnets | |
| Property (unit) | Sm-Co |
| Remanence (T) | 0.8–1.16 |
| Coercivity (MA/m) | 0.493–2.79 |
| Relative permeability (–) | 1.05–1.1 |
| Temperature coefficient of remanence (%/K) | −0.03..–0.05 |
| Temperature coefficient of coercivity (%/K) | −0.15..–0.30 |
| Curie temperature (°C) | 700–850 |
| Density (g/cm3) | 8.2–8.5 |
| CTE, magnetizing direction (1/K) | (5–9)×10−6 |
| CTE, normal to magnetizing direction (1/K) | (10–13)×10−6 |
| Flexural strength (N/mm2) | 150–180 |
| Compressive strength (N/mm2) | 800–1000 |
| Tensile strength (N/mm2) | 35–40 |
| Vickers hardness (HV) | 400–650 |
| Electrical resistivity (Ω·cm) | (50–90)×10−6 |