Permanent Ferrite Magnet

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Permanent Ferrite Magnet

The permanent ferrite magnet, also known as ceramic magnet, is composed of iron and barium or strontium oxides. It is charcoal gray in color and usually offered in the form of discs, rings, blocks, cylinders, etc. With high coercivity and high remanence after magnetization, the material is also very cheap. Hence, the ceramic magnet is widely used in many applications. It is usually found in magnetic assemblies designed for lifting, holding, retrieving, and separating purposes. Typical applications include loudspeakers, electromagnetic instrument pickups, household appliances, DC brushless motors, magnetic resonance imaging (MRI), magnetos used on lawnmowers and outboard motors, DC permanent magnet motors used in cars, and separators for separating ferrous material from non-ferrous material.

1. The permanent ferrite magnet has high intrinsic coercive force and is available in a variety of simple shapes.
2. Compared with alnico and rare earth magnets, the ceramic material is provided at the lowest prices and is lowest energy product. In addition, the service temperature of the material is lower than that of alnico and greater than that of rare earth.
3. The tooling is expensive. Finishing requires diamond cutting or grinding wheel.
4. Although the material is made to grades from 1 to 8, the most common grades are 1, 5 and 8. Grade 1 refers to the weakest ceramic material, which is typically non oriented. Grades 5 and 8 refer to oriented ceramic material, and grade 8 is the strongest grade of the ceramic material available.

For pressed material, tolerance on the thickness is ±0.005 and on other dimensions are ± 2.5% or ±0.010. According to IMA standards, some common visual imperfections we usually find in sintered metallic magnets are hairline cracks, porosity and minor chips. A chipped edge is acceptable as long as the missing surface is within 10 %. Cracks are considered acceptable if they don't extend across over 50% of pole surface.

Magnetizing and Handling
Because the material is very brittle, chipping or breakage may occur if it drops on a hard surface or is allowed to "jump at" an attracting object. Therefore, please handle the material with extreme care. When making magnetic assemblies with ceramic material, magnetizing the product after assembly will greatly facilitate the production.

The brittle ceramic material requires special machining techniques and equipment, instead of conventional ones. With years of experience in the field, our company has the techniques and equipment needed for cutting and grinding the material to your exact specifications.

Our company is a specialized permanent ferrite magnet manufacturer and supplier based in China. We also offer SmCo magnet (samarium cobalt magnet), aluminum nickel cobalt magnet (alnico magnet), permanent NdFeB magnet, and more.

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