Cylindrical SmCo Magnets

Cylindrical SmCo magnets adopt cylinder as basic structure, whose dimensions are defined by diameter and height. Compared with block magnets, cylindrical magnets bear more uniform stress and are easier to position during installation, making them suitable for round holes, sensor assemblies, magnetic attraction structures and high-temperature precision equipment.

According to different magnetic circuit designs, cylindrical SmCo magnets can generate stable axial magnetic fields. Radial magnetization is also customizable to meet assembly requirements of special structures.

Performance Grades: Please refer to our full SmCo grade performance table.

Magnetization Direction: Customized based on customers’ service conditions and assembly structures.

1. Material Composition

Cylindrical SmCo magnets are made of precisely proportioned rare metals including samarium, cobalt, iron, copper and zirconium. They are divided into two main systems: SmCo₅ and Sm₂Co₁₇, manufactured via multiple processes such as vacuum melting, powder making, compression molding and sintering, featuring stable magnetic properties under high temperatures.

2. Product Classification

Samarium-cobalt permanent magnets fall into Type 1:5 SmCo and Type 2:17 SmCo. Type 1:5 boasts a lower temperature coefficient, while Type 2:17 delivers higher magnetic energy product. Both types possess excellent high-temperature stability and anti-demagnetization performance, serving as premium permanent magnetic materials for high-temperature harsh working conditions.

3. Production Process

Raw material proportioning → Vacuum melting → Powder preparation → Oriented compression molding → High-temperature sintering → Precision machining → Surface protection → Magnetization for finished products

Machining procedures include cutting, cylindrical grinding, surface grinding, chamfering and polishing to guarantee that the outer diameter, height, parallelism and surface precision of cylinders meet precision assembly standards.

4. Surface Treatment

SmCo magnets have better natural oxidation resistance than NdFeB magnets. Passivation treatment is applicable for general working environments. For humid, acid-base and underground corrosive environments, optional treatments such as zinc plating, nickel plating, epoxy coating and electrophoresis can be adopted to enhance corrosion resistance and service life.

5. Main Applications

Aerospace components, high-temperature sensors, petroleum downhole detection instruments, vacuum equipment, precision medical instruments, high-temperature motors, military electronics, high-temperature testing equipment and other applications under high-temperature harsh conditions.