High Performance Rotors RE NdFeB Magnetic Isotropic Powder

High Performance RE Magnetic Powder For Rotors NdFeB Magnetic Isotropic Powder
Introduction of rare earth permanent magnet powder

Rare earth permanent magnet powder, magnetic powder processed by special process, can be used to prepare anisotropic injection and molded magnets. The particle size distribution and particle shape of the magnetic powder are specially designed, which are very suitable for bonding and molding, and are used to prepare high-performance magnets in the presence of a magnetic field. The (BH)max of the magnet prepared by the magnetic field injection molding method can reach 15MGOe; the magnet prepared by the magnetic field orientation molding method, the (BH)max can reach 25MGOe. More than twice that of boron bonded magnets. Anisotropic bonded magnets can be applied to micro-motor multi-pole rotors, magnetic tiles, sensors, etc.

 
Feature
 

The crystal shape of uncommon earth magnetic powder has excessive magnetic anisotropy. This method that the crystals of the cloth are preferentially magnetized alongside a few crystallographic axes, however hardly ever in different directions. Like different magnets, uncommon-earth magnets are composed of crystallite grains which can be aligned in a sturdy magnetic subject all through manufacture in order that their magnetic axes all factor within the identical path. The resistance of the lattice to converting the path of its magnetization makes those compounds very excessive coercive (anti-demagnetization), so sturdy demagnetization fields inside the completed magnet do now no longer lessen the magnetization of the cloth.

Atoms of uncommon earth factors will have excessive magnetic moments. Their orbital digital systems include many unpaired electrons; in different factors almost all electrons exist in pairs of contrary spins, so their magnetic fields cancel every different out, however in uncommon-earth factors the magnetic fields cancel every different out to a miles lesser diploma many. This is an end result of the unfinished filling of the f-shell, which could include as much as seven unpaired electrons. In a magnet, unpaired electrons line up and spin within the identical path, growing a magnetic subject. This offers the cloth a excessive remanence (saturation magnetization Js). The most strength density, BH, is proportional to J s 2 , so those substances have the ability to keep big quantities of magnetic strength. The strength product BH max of a neodymium magnet is about 18 instances the quantity of a "normal" magnet.
 

The Process

The molten NdFeB alloy is sprayed onto the cooling rollers at a certain speed and instantly solidifies to form a thin strip of 0.02-0.05mm thickness. During the rapid cooling process, Nd2Fe14B structure is formed, and finally the thin strip is broken into powder