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Ferrite Magnets Performance Characteristics
May 23, 2017

  Ferrite Magnets Ferrite magnets are sintered permanent magnetic materials, composed of barium and strontium iron body, this kind of magnetic material in addition to a strong anti-demagnetization performance, there are advantages of low cost. Ferrite magnets are rigid and brittle and require special machining processes. The opposite magnets are magnetized in the direction taken in the direction of their manufacturing direction, and their homogeneous magnets can be magnetized in any direction because they are not oriented, although a slightly stronger magnetic induction is found on the side where the compression surface is often the smallest. The magnetic energy product ranges from 1.1MGOe to 4.0MGOe. Due to the low cost, ferrite magnets have a wide range of applications, from motors, speakers to toys, handicrafts, and thus is currently the most widely used permanent magnet materials.

   Ferrite Magnets Using powder metallurgy method of production, residual magnetization is low, the magnetic permeability is small. Coercive force is strong, strong anti-demagnetization ability, especially suitable for dynamic working conditions of the magnetic circuit structure. The material is hard and brittle and can be used for cutting tools with emery tools. The main raw material is oxide, it is not easy to corrosion. Operating temperature: -40 ° C to + 200 ° C.

Ferrite magnets are divided into the opposite sex (heterosexual) and the same sex (isotropic). The isotropic sintered ferrite permanent magnet material has a weak magnetic properties but can be magnetized in different directions of the magnet. The anisotropic sintered ferrite permanent magnet material has strong magnetic properties but can only follow the magnet Fixed magnetization direction.

   Ferrite Magnets In the actual production of ferrite magnets, the chemical composition of good raw materials, and sometimes may not be able to obtain a good performance and microstructure of ferrite magnets, the reason is the physical properties of the impact. The physical properties of the listed iron oxides include the average particle size APS, the specific surface area SSA, and the bulk density BD. As the manganese zinc ferrite magnets in the formula accounted for about 70% of iron oxide, so its APS value of ferrite magnets powder APS value has a great impact. In general, the iron oxide APS value is small, ferrite magnets powder APS value is also small, is conducive to speed up the chemical reaction speed. However, taking into account the fine powder particles is not conducive to post-press suppression and sintering easy to crystallize the situation, APS value should not be too small. Obviously, when the iron oxide APS value is too large, in the calcination, due to the larger particle size, only the spinel phase diffusion reaction, can not be further grain growth process. This inevitably leads to an increase in the activation required during sintering, which is detrimental to the solid phase reaction.

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