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Talking about the advantages of ferrite magnets


  Ferrite magnet belong to sintering permanent magnet materials, barium and strontium iron body composition, which in addition to a strong anti-magnetic demagnetization performance, and low cost advantages. Ferrite magnets stiff and brittle, need special machining processes.   Anisotropic magnet because it is oriented along the manufacturing shall be taken along the direction of magnetization, while its same-sex orientation because there is no magnet can be magnetized in any direction, even though the pressure receiving surface is often minimal side will find a slightly stronger magnetic induction. Energy product in the range 1.1MGOe to 4.0MGOe. Because of low cost, ferrite magnets have broad applications, from electric motors, speakers and toys, crafts, so it is currently the most widely used permanent magnet materials.
1, features
  By powder metallurgy production, low residual magnetism, reply small magnetic permeability. Coercivity larger, anti-magnetic ability to strong, especially suitable for use as a dynamic operating conditions of magnetic structure. Hard and brittle materials can be used for diamond cutting tools. The main raw materials are oxides, it is difficult to corrosion. Working temperature: -40 ℃ to + 200 ℃.
  Divided into anisotropic ferrite magnets (anisotropic) and isotropic (isotropic). Other magnetic isotropic sintered ferrite permanent magnet materials can weak, but can be magnetized in different directions magnet; anisotropic sintered ferrite permanent magnet material with strong magnetic properties, but only along the magnet predetermined magnetization direction magnetization.
2, the physical properties of
  In the actual production of ferrite magnets, the chemical composition of good raw material, and sometimes may not be able to get good performance and microstructure of ferrite magnets, the reason is the impact of physical properties. The physical properties of iron oxide are listed including the average particle size APS, the specific surface area SSA and bulk density BD. Since the Mn-Zn ferrite magnet formulations of iron oxide accounts for about 70 percent, so the value of its APS APS have a great impact on the value of a ferrite magnet powder. In general, the value of small iron APS, APS value of a ferrite magnet powder is also small, help speed up the rate of chemical reactions. However, given the powder particles are too small and not conducive to after-pressing and sintering easy to crystallize the situation, APS value should not be too small. Obviously, when iron APS is too large, in the pre-burn, because the particle size is large, only the spinel phase diffusion reaction, it can not be further grain growth process. This will inevitably lead to the activation energy required for sintering improve, not conducive to solid-phase reaction.
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