Permanent magnet ferrite is primarily categorized into sintered ferrite magnets and injection-molded ferrite magnets. Both types are frequently requested by customers, but what exactly sets them apart? Recently, a customer reached out asking about the differences between these two types of magnets. This article aims to provide some clarity and help interested customers gain a deeper understanding.
To begin with, let's briefly discuss sintered ferrite magnets. Their production process closely resembles that of ceramics, which is why they're sometimes referred to as ceramic magnets. Sintered ferrite magnets are cost-effective, highly resistant to corrosion, and capable of withstanding temperatures up to 250°C. They require molds for shaping, and the most common forms include round, ring, tile, and cylindrical designs.
Next, we'll explore injection-molded ferrite magnets. These are a type of bonded magnet created by mixing ferrite magnetic powder with thermoplastic binders like nylon 12 (PA12), nylon 6 (PA6), or polyphenylene sulfide (PPS). This combination allows for injection molding, providing a versatile manufacturing method. The maximum operating temperature for these magnets is around 150°C, and molds are essential for production.
Now that we've covered the basics, let's delve into the key differences between these two types of magnets:
1. **Shape Complexity**: Injection-molded ferrite magnets excel in producing intricate shapes, whereas sintered ferrite magnets are limited to simpler designs, such as cutting corners, adding grooves, or drilling holes.
2. **Dimensional Accuracy**: Injection-molded ferrite magnets offer superior dimensional precision, typically with a tolerance of ±0.08. In contrast, sintered ferrite magnets usually have a tolerance range of ±0.1.
3. **Durability**: Due to their nylon content, injection-molded ferrite magnets exhibit enhanced durability. They are less prone to breaking upon impact compared to sintered ferrite magnets.
4. **Magnetic Strength**: Sintered ferrite magnets possess stronger magnetic properties than their injection-molded counterparts.
5. **Temperature Resistance**: While both types demonstrate excellent heat resistance, sintered ferrite magnets can endure higher temperatures, up to 250°C.
In today's motor industry, injection-molded ferrite magnets are increasingly being considered as a viable alternative to sintered ferrite magnets. Additionally, other options like injection-molded neodymium iron boron and bonded neodymium iron boron are gaining traction among customers. For those seeking samples, Kariki Magnet, a reputable manufacturer, welcomes inquiries.
This overview should help clarify the distinctions between these two types of ferrite magnets. If you have further questions or need assistance with specific applications, feel free to reach out!
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