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Views: 0 Author: Site Editor Publish Time: 2023-02-09 Origin: Site
Ferrite magnet is prepared by powder metallurgy process, with low remanence and permeability. It has large coercive force and strong anti demagnetization ability, and is especially suitable for magnetic circuit structures used under dynamic working conditions. The material is hard and fragile, and can be cut with emery tools. The main raw material is oxide, which is not easy to corrode. Operating temperature: - 40 ° C to+200 ° C.
What is a ferrite magnet made of?
What are the characteristics of ferrite magnets?
What are the characteristics of ferrite magnets?
Because ferrite magnets are generally considered to be the most powerful and durable magnets in the world.
What are ferrite magnets made of:
Composite ferrite
Chemical composition SrO6 (Fe2O3)
90% iron oxide
10% strontium carbonate
In addition to strontium ferrite magnets, there are another kind of ferrite magnets and ceramic magnets. The magnet is mainly composed of the chemical element iron oxide, and the rest is composed of barium.
Ferrite magnet is prepared by powder metallurgy process, with low remanence and permeability. It has large coercive force and strong anti demagnetization ability, and is especially suitable for magnetic circuit structures used under dynamic working conditions. The material is hard and fragile, and can be cut with emery tools. The main raw material is oxide, which is not easy to corrode. Operating temperature: - 40 ° C to+200 ° C.
Ferrite magnets are also divided into anisotropy (anisotropy) and isotropy (isotropy). Isotropic sintered ferrite permanent magnet materials have weak magnetism, but can be magnetized along different magnetic field directions; Anisotropic sintered ferrite permanent magnet materials have strong magnetism, but can only be magnetized along the direction of the magnet in the predetermined magnetization direction.
In the actual production of ferrite magnets, raw materials with good chemical composition sometimes cannot obtain ferrite magnets with good performance and structure, because of the influence of physical properties. The listed physical properties of iron oxide include average particle size aps, specific surface area s s a and apparent density bd. Since iron oxide accounts for about 70% of the manganese zinc ferrite magnet formula, its aps value has a great influence on the aps value of ferrite magnetic particles.
Generally speaking, the aps value of iron oxide is low, and the aps value of ferrite magnetic powder is also low, which is conducive to accelerating the chemical reaction. However, because the powder particles are too fine, it is not conducive to subsequent compaction and sintering, and APS value should not be too small. Obviously, when the aps value of iron oxide is too large, due to the particle size is too large, the spinel phase diffusion reaction can only be carried out in the pre sintering process, and the grain growth process can no longer be carried out. This inevitably leads to an increase in the activation energy required for sintering, which is not conducive to solid state reaction.
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