The basic characteristics of ceramic magnets have been sorted and optimized as follows:
Ceramic magnets are easy to demagnetize at extreme temperatures, and their thermal stability is the worst among all magnetic materials. However, they can be used in environments up to 300 C (570 F). Some specific brands of ceramic magnets have better high and low temperature resistance, but the actual performance depends on many factors. By using magnetic geometric structures such as back plate, yoke or return path structure, it can better cope with temperature changes. Like most ceramic materials, the heating or cooling rate of ferrite magnets should not exceed 200°F per hour.
Ceramic magnets have excellent corrosion resistance. Coatings can be used to decorate magnets or reduce the generation of ferrite powder associated with ceramic magnets.
Ceramic magnets have very high hardness and brittleness. On the Mohs hardness scale, its average hardness is 7, so traditional machine tools and tools are not suitable for machining ceramic magnets. It is usually necessary to use diamond tools and some abrasives to process this magnetic alloy. Most magnetic materials are processed in a non-magnetized state, and once the manufacturing and cleaning operations are completed, the magnets will be magnetized to a saturated state.
Ceramic magnets are relatively easy to magnetize, and only a reasonable magnetization field is needed to realize magnetization. They are usually used with low-carbon steel components, such as motor housings or backplanes. Generally, it is necessary to carry out magnetization operation when ceramic magnets are mounted on/in these components.
Ceramic magnets are inherently fragile and are particularly prone to cracking in applications involving impact or bending. Like all magnetic materials, ceramic magnets should not be used as structural elements in design.