Bonded NdFeB magnets and injection molded ferrite magnets are two common permanent magnet materials, yesterday an engineer asked what are the differences between the two of them (differences), this is how I replied to him.

Bonded NdFeB magnets and injection molded ferrite magnets are two common permanent magnet materials, they are in the material, performance, shape flexibility, application and cost there are some differences, the following is the content details.

1. Material Differences

Bonded NdFeB uses high-performance NdFeB alloy powder, which belongs to rare earth permanent magnetic materials. While injection molded ferrite uses ferrite ceramic magnetic powder.

2、 Differences in magnetic properties

Bonded neodymium iron boron has high magnetic properties, usually with high coercivity and magnetic energy product, which is generally between 60-90 kJ/m ³， Suitable for applications that require high magnetic energy product. However, the magnetic properties of injection molded ferrite are relatively low, with smaller coercivity and magnetic energy product. The magnetic energy product is generally between 12-17 kJ/m ³， Suitable for applications that require lower magnetic performance.

Pictured is an injection molded ferrite radial rotor ring magnet.

3、 Differences/Differences in Shape Flexibility

Due to the characteristics of injection molding technology, injection molded ferrite is more flexible in shape and can manufacture complex shaped components, suitable for applications with special shape requirements. Bonded neodymium iron boron is usually prepared using powder metallurgy technology, which is more complex than injection molding technology. In general, the shape of bonded neodymium iron boron is limited by mold design and sintering process, so its shape is relatively limited, and most commonly seen are ordinary rings.

4、 Differences in application fields

Bonded neodymium magnets is commonly used in applications that require high magnetic performance, such as motors, sensors, disk drives, etc.

Injection molded ferrite is often used in applications that are cost sensitive and require high corrosion resistance, such as automotive parts, household appliances, medical equipment, etc.

5、 Differences in cost

The main raw materials for bonding neodymium iron boron magnets are rare earth elements such as neodymium, iron, and boron, while the main raw materials for injection molded ferrite magnets are ferrite magnetic powders. In contrast, the price of rare earth elements is relatively high, so the cost of raw materials for bonding neodymium iron boron is higher.

Injection molded ferrite and bonded NdFeB size selection;

Bonded Neodymium Magnets

Injection Molded Ferrite Magnets

More comparisons between magnets;

Injection molded ferrite vs injection molded neodymium magnets

Sintered Ferrite Magnets VS Injection Molded Ferrite Magnets