Specifications of Different Types of Permanent Magnet
Permanents magnets are divided into Ceramic magnet, Alnico magnet, Samarium Cobalt magnet, Neodymium Iron Boron (NdFeB) magnet, Injection moldable magnets, Flexible magnets.
1. Ceramic magnet, also called Ferrite Magnet. It is made of a composite of iron oxide and barium or strontium carbonate.
Strength: Low Cost, High Coercive Force, High Resistance to Corrosion
Weakness: Low Energy Product, Low Mechanical Strength - Brittle
2. Alnico magnets, are an alloy containing Aluminium (Al), Nickel (Ni), Cobalt (Co) hence its name Alnico.
Strength: High Corrosion Resistance, High Mechanical Strength, High Temperature Stability
Weakness: High Cost, Low Coercive Force, Low Energy Product
3. Samarium Cobalt magnet, is a strong permanent magnet made of an alloy of samarium and cobalt.
Strength: High Corrosion Resistance, High Energy Product, High Temperature Stability, High Coercive Force
Weakness: High Cost, Low Mechanical Strength - Brittle
4. Neodymium Iron Boron (NdFeB) magnet, a permanent magnet made from an alloy of neodymium, iron and boron, from Nd2Fe14B tetragonal crystalline strcuture.
Strengeth: Very High Energy Product, High Coercive Force
Weakness: Low Mechanical Strength - Brittle, Moderate Temperature Stability, Low Corrosion Resistance
5. Injection moldable magnets, are a composite of resin and magnetic powders of different materials allowing parts to be made in an injection molding process.
Strength: Moderate Energy Product, Moderate Coercive Force, High Corrosion Resistance, Highly Shapeable
Weakness: High Cost, Low Temperature Stability
6. Flexible magnets, also named as rubber magnet, are produced in flat strips and sheets.
Strength: Low Cost, High Corrosion Resistance,Moderate Coercive Force
Weakness: Low Energy Product, Low to Medium Temperature Stability