Production principle
Sintered ferrite magnets are manufactured using a powder metallurgy process, using iron oxide as the primary raw material, with the addition of strontium or barium compounds. After pre-sintering and pulverization into a micron-sized powder, they are pressed into a mold. Orientation and compaction in a magnetic field can be performed to enhance magnetic properties. The resulting green body is sintered at approximately 1200°C, where the particles diffuse and bond to form a dense ceramic structure, resulting in excellent strength and stable magnetic properties. Subsequent grinding, cutting, and magnetization processes yield a finished product with precise dimensions, stable performance, high-temperature and corrosion resistance, and low cost. These products are widely used in applications such as motors and speakers.
Workshop environment
FAQ
Why is sintered ferrite more heat-resistant than injection-molded ferrite?
Sintered ferrite uses a high-temperature sintering process and has a ceramic structure, allowing it to withstand higher operating temperatures (+250°C or even higher). Injection-molded ferrite, however, has a lower temperature resistance due to its resin matrix.
How corrosion-resistant is it? Does it require additional coating?
Sintered ferrites offer excellent corrosion resistance and chemical stability, and in many cases, they can be used in humid or aqueous environments without the need for additional protective coating.
How do material composition and manufacturing processes affect magnetic properties?
The raw material ratio, powder particle size, molding method (dry pressing, wet pressing, orientation), and sintering temperature all significantly affect magnetic properties and consistency.
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