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ferrite magnet encyclopedia- magnet product manufacturer

ferrite magnet encyclopedia- magnet product manufacturer


In this article, as a professional industrial magnet product manufacturer, Newland magnet factory is going to walk you through ferrite magnet's industrial knowledge. More info, stay tuned.

Ferrite magnet is a kind of permanent magnet made mainly from SrO or BaO and Fe2O3. Developed by Newland Magnetic, ferrite magnets are hard, brittle and  they have lower magnetic energy than other permanent magnets. However, it is not easy of demagnetization and corrosion, and its production process is simple at low in price. Therefore, ferrite magnet has the highest output in the whole magnet industry and is widely used in industrial production currently.

Ferrite magnet is a sintered permanent magnetic material, which is composed of barium and strontium iron body. Ferrite magnets are rigid and brittle, requiring special machining processes. For its opposite magnets, because they are oriented in the direction of manufacture, such ferrite magnet must be magnetized in the direction, while its same magnets, because they are not oriented, they can be magnetized in any direction, although a slightly stronger magnetic induction is often found on the smallest side of the compression surface.

Such magnetic energy product ranges from 1.1MGOe to 4.0MGOe. Due to its low cost, ferrite magnet has a wide range of applications, from motors and magnetic speakers to toys and handicrafts. Therefore, it is the most widely used permanent magnet material at present.


Ferrite magnets are  produced by powder metallurgy with low remanence and low recovery permeability. It is especially suitable for magnetic circuit structure under dynamic working conditions. The material is hard and brittle, and ferrite magnets can be used for cutting with emery tool. The main raw material is oxide, so it is not easy to corrode. Operating temperature is under -40℃ to +200℃.

Ferrite magnet is divided into anisotropy (anisotropy) and isotropy (isotropy). The magnetic property of iso-tropic sintered ferrite permanent magnet is weak, but it can be magnetized in different directions. Different sintered ferrite permanent magnetic materials have strong magnetic properties, but they can only be magnetized along the predetermined direction of the magnet.


In the actual production of ferrite magnet, the raw materials with good chemical composition may not be able to obtain ferrite magnet with good properties and microstructure, the reason is the influence of physical properties. The physical properties of iron oxide listed include mean particle size APS, specific surface area SSA and loose density BD. Because ferric oxide accounts for 70% of the formula of manganzite ferrite magnet, its APS value has a great influence on the APS value of ferrite magnet powder.

Generally speaking, the APS value of iron oxide is small, and the APS value of ferrite magnet powder is also small, which is conducive to accelerating the speed of chemical reaction. However, the APS value should not be too small considering that too fine powder particle is not conducive to the subsequent compaction and sintering of easy crystallization. Obviously, when the iron oxide APS value is too large, the diffusion reaction of spinel phase can only be carried out during pre-firing due to the large particle size, and the grain growth process cannot be carried out further. This must result in higher activation energy required during sintering, which is not conducive to solid reaction.

Comparision with Ndfeb magnet

Ferrite magnets are metal oxides that are ferromagnetic. In terms of electrical properties, ferrite has a much higher resistivity than metal or alloy magnetic materials, and it also has higher dielectric properties. Ferrite also exhibits high permeability at high frequencies. Therefore, ferrite has been widely used in the field of high frequency weak current non-metallic magnetic materials. A nonmetallic magnetic material is a composite oxide (or orthoferrite) of magnetic iron oxide and one or more other metal oxides. Magnetic force is usually 800-1000 Gauss, often used in speakers, loudspeakers and other instruments.

The advantage of Neodymium iron boron magnet is cost-effective, with good mechanical properties; The disadvantage is low temperature point, poor temperature characteristics, and easy to powder corrosion, it must be adjusted by chemical composition and surface treatment methods to improve, to meet the requirements of practical application. Ndfeb belongs to the third generation of rare earth permanent magnet. Characterized by small size, light weight and strong magnetism, it is currently the best performance-to-price magnet and is known as the king of magnetism in the field of magnetism. The advantage of high energy density makes ndFeb permanent magnet widely used in modern industry and electronic technology. In the bare magnetic state, the magnetic force can reach about 3500 Gauss.

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