China Ferrite Magnet Manufacturer, Supplier, Factory

Introduction to Hard Ferrite Magnets

Also known as ceramic magnets, Ferrite Magnet are permanent magnets composed primarily of iron oxide (Fe2O3) combined with strontium or barium carbonate. They are sintered ceramic materials, offering excellent value due to their low cost and strong resistance to demagnetization and corrosion. Their inherent hardness and brittle nature classify them as "hard" ferrites, distinguishing them from "soft" ferrites used in electronics. These magnets are ubiquitous in applications ranging from loudspeakers and electric motors to magnetic holding devices and refrigerator seals, providing reliable and economical magnetic solutions.

Key Characteristics and Advantages

The widespread use of ferrite magnets is driven by a compelling set of advantages. Their most significant benefit is their low cost per unit of magnetic energy produced, making them the most economical choice for many high-volume applications. They exhibit exceptional corrosion resistance, requiring no surface coating or plating, even in humid environments. Furthermore, they possess high intrinsic coercivity, meaning they are very difficult to demagnetize once magnetized. This makes them stable and reliable over long periods. While their magnetic strength is lower than that of neodymium magnets, their thermal stability is superior, with a maximum operating temperature often reaching 250°C (482°F) or higher, depending on the grade.

Primary Advantages:

Lowest cost per energy product among permanent magnets.

No need for protective coatings, ideal for damp conditions.

 Excellent resistance to demagnetization from external fields or temperature.

 Can operate effectively at much higher temperatures than rare-earth magnets.

Reduces eddy current losses in AC applications.

Detailed Product Parameters and Grades

Ferrite magnets are characterized by several key magnetic and physical properties. The most common grades are anisotropic, meaning they are magnetically oriented during manufacturing to produce a preferred direction of magnetization, resulting in stronger magnetic properties. Isotropic grades, which are not oriented, are weaker and less common. Below are the critical parameters used to specify these magnets.