Generally, the practitioners of NdFeB magnet manufacturers have the most contact with sintered NdFeB magnets, that is, sintered magnets. According to different production processes, there are injection-molded NdFeB magnets in the classification of NdFeB products, What are the differences between injection molded NdFeB magnets and sintered NdFeB magnets?

Sintered NdFeB Magnets

Sintered neodymium magnets are made by powder metallurgy technology. Sintered NdFeB permanent magnets have strong machinability and can be machined (cutting, slicing, grinding, etc.) into different shapes. The coercivity value is high, but its surface is easy to corrode and oxidize, and it needs to be electroplated according to the specific use environment. Its texture is hard and brittle, it has high resistance to retreat, and its temperature resistance is not strong, so it is not suitable for high temperature working environment. However, most of the NdFeB magnet manufacturers on the market are sintered magnets because they are widely used.

Injection NdFeB Magnets

A composite material made by mixing NdFeB magnetic powder and some polymer materials through a special process. It has extremely high precision, corrosion resistance, does not require machining such as cutting, and can be made into thin-walled rings or thin magnets with complex anisotropic shapes.

Comparison between injection molded magnets and sintered magnets:

1. Production process

• Injection molding permanent magnet: The process is simple, and it can be injection molded together with various metal and non-metal inserts, and multiple composite moldings can be performed.

• Sintered permanent magnet: the process is more complicated, and it needs to be assembled with other metal inserts.

• Advantages of injection molding magnetic contrast: lower production and assembly costs.

2. Magnetic properties

• Injection permanent magnet: the surface magnetic field performance is high.

• Sintered permanent magnet: the surface magnetic field performance is very high.

• Advantages of injection molding magnetic contrast: stable performance, effectively improving motor performance.

3. Reliability

• Injection permanent magnet: The product has high toughness, strong mechanical properties, and is not easy to break and notch.

• Sintered permanent magnet: The product has high strength, but it is brittle and easy to break, chip and collapse.

• Advantages of injection molding magnetic contrast: greatly increase the service life and reliability of the motor.

4. Dimensional accuracy

• Injection permanent magnet: injection molding method is adopted, with high precision, good product consistency and high operation balance

• Sintered permanent magnet: The sintered molding method is used, the product precision is poor, and it is assembled with other inserts, and the product operation balance is not high.

• Advantages of injection molding magnetic contrast: high product consistency, stable quality, and guaranteed motor quality.

5. Multi-polarization

• Injection permanent magnet: It can be molded into any multi-pole product at one time without reducing the surface magnetism.

• Sintered permanent magnet: coil magnetization method is used, the process is complicated, the more the number of poles, the higher the cost, the accuracy is poor, and the magnetism is not easy to control.

• Advantages of injection molding magnetic contrast: greatly improve the freedom of motor design.

The above content is the comparison between injection-molded magnets and sintered magnets in terms of production process, magnetic properties, reliability, dimensional accuracy, and multi-polarization. Injection-molded magnets can be processed into complex shapes and have high product precision. Generally, they are widely used as high-end magnetic materials.