Ferrite magnet is a permanent magnet made of SrO, BaO and Fe2O3. Compared with other permanent magnets, ferrite magnets are hard and brittle, and with low magnetic energy. However, it is not easy to demagnetize and corrode, and it has a simple production process, low price. Therefore, ferrite magnets have the highest yield and are widely used throughout the magnet industry. Below, we will introduce the basic overview and characteristics of ferrite magnets.
Ferrite magnet is a kind of metal permanent magnet composed of barium and strontium ferrite, which has the advantages of strong anti-demagnetization and low cost. Block ferrite magnets are rigid and brittle, which require special machining technology. Because of orientation along the manufacturing direction, its opposite magnet must be magnetized along the direction taken, and its same magnet because of no orientation, can be magnetized along any direction, although the compression surface is often the smallest side, but the magnetic induction is slightly stronger.
The magnetic energy product ranges from 1.1MGOe to 4.0MGOe. Because the ferrite magnet cost is low, it has a wide range of applications, from motors to toys, crafts. It is the most widely used permanent magnet material.
It uses powder metallurgy production, and it is with low remanence, small recovery of magnetic permeability. It has strong diamagnetic ability, especially suitable for dynamic working conditions used as a magnetic circuit structure. The material is hard and brittle and can be used for cutting with emery tools. The main raw material is oxide, so it is not easy to corrode.
Operating temperature of ferrite magnet: -40℃ to +200℃. Block ferrite magnets are divided into anisotropy (heterotropy) and isotropy (isotropy). The magnetic properties of isotropic sintered ferrite permanent magnet materials are weak, but they can be magnetized in different directions of the magnet. The sintered ferrite permanent magnet material has strong magnetic properties, but it can only be magnetized along the predetermined magnetizing direction of the magnet.
The main raw materials of ferrite magnet include BaFe12O19 and SrFe12O19. Made by ceramic process and magnetic steel process, it is a hard and brittle material. Because ferrite magnet has good temperature resistance, low price and moderate function, it has become a widely used permanent magnet.
Ferrite is a metal oxide with ferromagnetism. In terms of electrical properties, the resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it has a higher dielectric function. Therefore, block ferrite magnet has become a widely used non-metallic magnetic material in the field of high frequency and weak current.
Ferrite is a sintered magnetic metal oxide composed of various ferric oxide mixtures. The main raw materials are ferric oxide, barium carbonate or strontium carbonate. Because the magnetic energy stored in the unit volume of ferrite is low, the saturation magnetization is also low (usually as long as 1/3 ~ 1/5 of pure iron), thus restricting its use in the category of low frequency strong electricity and high power which require higher magnetic energy density.