Ceramic Industrial Magnets

Production description

Ceramic industrial magnets are a type of permanent magnet made mainly of SrO or BaO and Fe2O3. Compared with other permanent magnets, ferrite magnets are hard and brittle, and have lower magnetic energy. However, it is not easy to demagnetize or corrode, the production process is simple and the price is low. Therefore, ferrite magnets have the highest output in the entire magnet industry and are widely used in industrial production.

‌ What is the main advantage of ferrite magnets over NdFeB magnets?

 

The main advantages of ferrite magnets over NdFeB magnets are that they are cheap, not easy to corrode, simple in production process, and more adaptable to ambient temperature.

Ferrite magnets have low cost and are relatively cheap. This makes it more economical and applicable in some occasions with relatively low requirements for magnetic force and stability‌. In contrast, NdFeB magnets have high cost and are more expensive due to the presence of rare earth elements‌.

Production process

The production process of ferrite magnets is relatively simple and does not require complex manufacturing processes, so the production efficiency is high and suitable for large-scale production. This makes ferrite magnets more competitive in the market‌.

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Working temperature and environmental request

 

Ferrite magnets have good environmental adaptability and can be used in a wide temperature range. Although their magnetic properties are not as stable as NdFeB, ferrite magnets are more stable in some application scenarios that are more sensitive to temperature changes‌.

They are not easy to corrode and have good chemical stability. This makes ferrite magnets have a longer service life in humid or corrosive environments.

Low Cost and Ideal for a Wide Variety of Applications

Ceramic industrial magnets are sintered permanent magnets, composed of Barium or Strontium Ferrite. Aside from good resistance to demagnetization, ceramic magnets are very low cost and ideal for a wide variety of applications.

Manufacturing: Ceramic(ferrite) magnets are produced by pressing and sintering fine powder into the required shape. Because they are hard and brittle, they require specialized machining techniques and are best machined in an un-magnetized state. We are fully equipped to machine these materials to your custom specifications.

Surface Treatments: Ceramic(ferrite) magnets have excellent resistance to oxidation, and do not typically require a protective coating, plating or surface finish.

Magnetizing & Handling: Ceramic(ferrite) magnets require magnetizing fields of about 10 kilo Oersteds. They can be magnetized with multiple poles on one or both pole surfaces. No special handling precautions are required, except that large blocks of Ceramic magnets are powerful, so special care should be taken to ensure that they do not snap towards each other.

Common Applications: Motors, magnetic couplings, sensors, loudspeakers, holding-magnet systems, crafts, novelties, toys, and more.

Temperature Considerations: Ceramic(ferrite) magnets can be used at temperatures up to about 525⁰F (300⁰C). Magnetic properties decline fairly linearly with temperature for this material.

Each custom made magnets has its own special requirements and characteristics. It can be different magnetic properties. a different grade or finishing. Each customer has his own magnet fitted to his application and assembly line. corners could have different radiuses. The phases could have different finishing, sizes and even tolerances.

FAQ

How much temperature can ferrite magnets withstand?

Ferrite magnets can withstand temperatures ranging from -40°C to 250°C.

When reaching -20°C (-4°F) or lower, the coercivity (Hci) drops to a level that may cause the magnet to begin to demagnetize (depending on the shape and application).

In special cases, it can sometimes reach +300°C (572°F).

Will ferrite magnets rust?
Ferrite magnets do not rust. Ferrite magnets are made of oxides such as SrO, BaO, and Fe2O3, which themselves are not easily corroded. Therefore, ferrite magnets will not rust in water. ‌
The corrosion resistance of ferrite magnets is mainly attributed to their chemical composition. Due to its raw material being oxide, ferrite magnets exhibit good corrosion resistance in humid environments and therefore require minimal coating treatment. In addition, ferrite magnets have high hardness, which makes them perform well under dynamic working conditions and suitable for applications that require high demagnetization resistance.

Compared with other types of magnets, neodymium iron boron magnets and samarium cobalt magnets have stronger magnetism, but they are prone to corrosion in humid environments and usually require coating protection. Although aluminum nickel cobalt magnets are also corrosion-resistant, they may still corrode slightly in water. In contrast, the corrosion resistance of ferrite magnets gives them advantages in many applications.

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