Disc Alnico Magnets

Disc Alnico magnets adopt thin disc as basic shape, with dimensions defined by outer diameter and thickness. They deliver stable and reliable magnetic performance, and their magnetic force is barely affected by temperature fluctuations. Thus they are ideal for working conditions that demand consistent magnetic fields and experience wide ambient temperature variations.

Compared with NdFeB and samarium-cobalt magnets, Alnico magnets have relatively lower magnetic energy product, yet they stand out in temperature stability and anti-demagnetization capacity. They are particularly suitable for high-temperature, precision and long-term stable operation applications.

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

Magnetization Direction: Customizable based on customers’ equipment magnetic circuit structure.

1. Material Composition

Disc Alnico magnets mainly consist of aluminum, nickel, cobalt, iron, copper and other metallic elements, manufactured by high-temperature smelting, casting or sintering processes. Different grades deliver differentiated magnetic properties and temperature stability by adjusting metal ratios and heat treatment procedures.

2. Product Classification

Alnico magnets are categorized into cast Alnico and sintered Alnico. Cast Alnico features stable internal structure and cost advantages, suitable for general industrial applications; sintered Alnico owns more uniform internal microstructure and consistent magnetic performance, perfect for precision instruments and high-performance scenarios.

3. Production Process

Both processes can produce various shapes including discs, cylinders, squares and special-shaped custom magnets.

4. Surface Treatment

Alnico magnets have natural excellent oxidation resistance, and passivation treatment is sufficient for standard working environments. For strict requirements on appearance and anti-corrosion performance, nickel plating, zinc plating and epoxy coating are optional to improve surface smoothness and environmental adaptability.

5. Main Applications

Precision measuring instruments, temperature sensors, motors, electro-acoustic components, relays, magnetic chucks, high-temperature equipment, petroleum testing instruments, aerospace fittings, military electronic components, and all magnetic systems requiring long-term stable magnetic output.