Isotropic NdFeB Powder

Isotropic NdFeB powder is generally referring to the magnetic powder for bonded magnets. The manufacture process of this kind of powder is totally different from sintered Neodymium magnet’s. The powder made by crushing casting strip or sintered magnet does not have functional intrinsic coercivity under the same particle size as isotropic NdFeB magnet. The molten alloy condenses to microcrystal or even amorphous structure at the cooling speed between 10⁵ and 10⁶℃/s under the inert gas environment, then grain size enhance to tens or hundreds nanometers after crystallization heat treatment, thus obtained high intrinsic coercivity in the sub-micron grains which lower than single domain critical size of Nd₂Fe₁₄B. The powder made by melt-spun technology is belonging to polycrystalline powder and easy magnetization axis of each grain does not get strong alignment tendency, therefore, powder is isotropic.