Ningbo Xinfeng Magnet sintered ndfeb magnet experience Nd-Fe-B alloy ingots or scales broken by hydrogen, add a proprietary additive in the HD powder evenly mixed together jet mill (JM). Addition amount about 0.03% -0.05% powder, this additive is a multiple of organic compounds. Gene pro-oil, or C17H35-based. Small amount of polarity genes, such as lipid-based, etc., it has the appropriate length. JM magnetic powder particles in the course of repeated impact and contact with the additive, it will face in each particle coating layer thickness of about 5-8nm additive films, which play the following role. To prevent the powder particles in contact with air, from the oxidation effect; reduced static magnetic powder particles effects, reduce the reunion between the powder particles played the role of dispersant; increase the mobility of the powder particles with mobility, from the lubricant effect; favorable powder particles in a magnetic field tended to enhance the orientation degree; the Br can increase 0.02-0.04T, the energy product can also be increased accordingly. It is worth noting that additives play a temperature of about 350 degrees, when sintering temperature in the 400-420 degree heat for some time, so that additives emitted from the magnets so as to avoid increasing carbon; additive of some slight odor, in that material and pressure-type should be appropriate protection; additive, forming pressure should be increased appropriately. JM equipment additives on grinding chamber wall pipe and a slight corrosion.