Comparison between injection molded magnets and sintered magnets
Injection molding and sintering are two common methods for preparing permanent magnet materials. They have some similarities, but also some differences. Here is a comparison of them:
1. Preparation method: Injection molding is prepared by mixing magnetic powder and plastic resin and then injection molding, while sintering is done by pressing magnetic powder at high temperature.
2. Cost: The production cost of injection molding is relatively low because of its simple preparation process and high production efficiency, while the preparation process of sintering is more complicated and requires high-temperature treatment, so the cost is higher.
3. Magnetic properties: The magnetic properties of sintering are generally higher than those of injection molding, because the particle structure of sintering is denser and the magnetic domain alignment is better, while the particle structure of injection molding is relatively loose and the magnetic domain alignment is poor.
4. Shape and size: Injection molding can be prepared into magnets with complex shapes and small sizes, while sintering is generally suitable for the preparation of magnets with large sizes and simple shapes.
5. Process control: The production process of injection molded magnets can be controlled by controlling parameters such as injection speed and temperature, while the production process of sintered magnets is more important for controlling parameters such as temperature and pressure.
Sintered Magnets
Injection Molded Magnets
In summary, injection molded magnets and sintered magnets each have their own advantages and limitations, and the specific choice depends on factors such as the required magnetic properties, shape and size, cost and process requirements.
