Mirrack shares knowledge about alloy powders

The alloy powders is a kind of soft magnetic material which is made of iron-based alloy material and is pressed by surface insulation coating and inorganic binder.

Since the ferromagnetic particles are small (0.5 to 5 micrometers used at high frequencies) and are separated by non-magnetic electrically insulating membrane materials, on the one hand, eddy currents can be isolated, the material is suitable for higher frequencies; The gap effect between the two causes the material to have low magnetic permeability and constant magnetic permeability; and because the particle size is small, the skin phenomenon does not occur substantially, and the magnetic permeability changes with frequency, which is mainly used for high frequency inductance. . The magnetic properties of the magnetic powder core mainly depend on the magnetic permeability of the powder material, the size and shape of the particles, their filling factor, the content of the insulating medium, the molding pressure and the heat treatment process. Commonly used magnetic powder cores are iron powder core, permalloy powder core and iron silicon aluminum powder core. The effective magnetic permeability μe of the magnetic core and the calculation formula of the inductance are: μe=(L×le×109)/4×π×N2×Ae where: L is the inductance (H), and le is the effective magnetic path length of the magnetic core. (cm), N is the number of winding turns, and Ae is the effective cross-sectional area (cm2) of the core.

Mirrack (Guangdong) Micro Metal Magnet Tech. Co., Ltd. is a hi-tech company specializing in R&D & manufacturing of high quality alloy powder cores, as well as a solution provider for a variety of magnetics applications.