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    Ferrite Magnet Have A Strong Anti-demagnetization Performance

    Dongyang Aviation Magnetic Ltd | Updated: Sep 07, 2017

    Ferrite magnets are a permanent magnet made of SrO or BaO and Fe2O3 as raw materials. Early development by the gifted magnetic company, compared with other permanent magnet, ferrite magnets hard and brittle, low magnetic energy. But it is not easy to demagnetize the corrosion is not easy, the production process is simple and inexpensive, therefore, in the entire magnet industry, the highest output of ferrite magnets and is widely used in industrial production.

    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. The 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, 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 face 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.

    Using powder metallurgy method of production, remanence is low, the magnetic permeability is small. Coercive force is strong, anti-demagnetization ability is strong, 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 (anisotropy) 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.

    In the actual production of ferrite magnets, the raw material with good chemical composition may not necessarily obtain the ferrite magnets with good performance and microstructure, and the reason is the influence of the physical properties. 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, 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 are 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, because the larger particle size, only the spinel phase diffusion reaction, can not be further grain growth process. This inevitably leads to an increase in activation required for sintering, which is detrimental to the solid phase reaction.