Device and method for preparing anisotropic neodymium iron boron magnetic powder and neodymium iron boron magnetic powder

The invention provides a device and method for preparing anisotropic neodymium-iron-boron magnetic powder and neodymium-iron-boron magnetic powder.The device is an HDDR diffusion treatment furnace and comprises a powder preparing furnace body based on the HDDR technology and a furnace body main cavity of the powder preparing furnace body, and an outer cavity which is in airtight conduction with the furnace body main cavity is formed in the outer wall face of the powder preparing furnace body in a protruding mode; a switch valve used for containing and blocking diffusion source powder is arranged at the position, close to the furnace body main cavity, of the outer cavity, and a plurality of air holes with the hole diameter smaller than that of the diffusion source powder are formed in a blocking valve body of the switch valve. By means of the device and method for preparing the anisotropic neodymium iron boron magnetic powder and the neodymium iron boron magnetic powder, the coercive force and temperature stab