Magna magnet products
Ferrite magnets made from abundant ferric oxide are currently the cheapest and most stable sintered magnets (ceramic magnets).Since it has a high coercive force, it is difficult to demagnetize and is suitable for flat shapes.
Since the raw material of powder is molded by a press and sintered in a furnace at about 1,200 ° C, it has excellent corrosion resistance and is suitable for mass production.
It can be divided into two types: anisotropic ferrite magnets (Anisotropic Ferrite) and isotropic ferrite magnets (Isotropic Ferrite).
Features of ferrite magnets
- Materials can be supplied inexpensively and stably.
- Since the coercive force is high, it is difficult to demagnetize.
- Since it is a pottery, it is easily broken, but it is suitable for mass production because the raw material of powder is molded by a press machine.
- Since the specific gravity is 4.8 g / cm³, it can be lighter than other magnets.
- 2 to 10 or more poles on a flat surface.In addition, since multi-pole magnetization can be performed on the outer circumference, demand for meters and motors is increasing.
- It is used as a raw material for rubber magnets and plastic magnets.
For various devices for electronic devices, motors and generators for automobiles.Stationery, household goods, health equipment, etc.
Ferrite magnet product information
[Wet type] The main raw material is iron oxide, and a few percent of strontium is added to it and mixed with water to form a slurry (muddy water), which is then press-molded in a mold.Since the molding is performed in a magnetic field, the smallest units of the magnets are aligned in one direction to form an anisotropic magnet.After sintering in the furnace, polishing and cleaning are performed to improve the dimensional accuracy of the height.
[Dry type] The raw material is granules of powder, press-molded, and sintered in a furnace.The magnetic force is about 7% lower than that of the wet type, but unlike the wet type, it can be chamfered by press molding.
The main raw material is iron oxide.Mix it with a few percent of barium to make a powder, and then use the granules.After press molding without applying a magnetic field, it is sintered in a furnace.Since the magnetic force is applied in the direction in which the magnetizing magnetic field is applied, the magnetic force is generated both in the axial direction and in the radial direction.However, the magnetic force is about half as strong as that of anisotropic ferrite.
A magnet application product that combines a ferrite magnet and a yoke (iron) to concentrate the magnetic force in a certain direction and make it stronger.