Abstract: A method of improving coercivity of an Nd—Fe—B magnet includes a first step of providing an Nd—Fe—B magnet having a first surface and a second surface. Next, a first solidified film of at least one pure heavy rare earth element is formed and attached to the first surface of the Nd—Fe—B magnet to prevent a reduction in corrosion resistance caused by oxygen and fluorine and hydrogen. After forming the first solidified film, the Nd—Fe—B magnet is subjected a diffusion treatment in a vacuum or an inert atmosphere. After the diffusion treatment, the Nd—Fe—B magnet is subjected to an aging treatment in the vacuum or the inert atmosphere.

Abstract: A method of making a finished Nd—Fe—B magnet includes a first step of providing a rare earth magnet powder. Then, a green compact is formed using the rare earth magnet powder. The green compact includes at least one orientation surface, at least one non-orientation surface, and at least one pressing surface. Next, the green compact is cut using a cutting apparatus along the at least one orientation surface, the at least one non-orientation surface, or the at least one pressing surface, under an inert atmosphere to produce a plurality of sliced compacts. Then, the sliced compacts are sintered to produce sintered compacts. The sintered compacts are annealed to produce annealed compacts. The annealed compacts are then machined to obtain finished Nd—Fe—B magnets. The step of cutting is performed before the steps of sintering, annealing, and machining. A cutting apparatus for cutting the green compact is also disclosed herein.

Abstract: A method of segmenting a cured Nd—Fe—B magnet includes providing a first and a second Nd—Fe—B magnet. The surface of the Nd—Fe—B magnets is cleaned. An insulating adhesive is deposited on the surface of the first Nd—Fe—B magnet. Then, the first Nd—Fe—B magnet is cured. Next, a layer of the insulating adhesive is deposited on the surface of the Nd—Fe—B magnets. Then, the first Nd—Fe—B magnet and the second Nd—Fe—B magnet are stacked to produce a stacked Nd—Fe—B magnet. After stacking, a predetermined clamping pressure is applied to the stacked Nd—Fe—B magnet. The stacked Nd—Fe—B magnet is then cured to produce a cured Nd—Fe—B magnet. The cured Nd—Fe—B magnet is then machined into a plurality of small Nd—Fe—B magnets. The step of depositing the insulating adhesives is further defined as depositing a plurality of beads of the insulating adhesive onto the surface of the first Nd—Fe—B magnet.

Abstract: A method of improving coercivity of an Nd—Fe—B magnet includes a first step of providing an Nd—Fe—B magnet having a first surface and a second surface. Next, a first solidified film of at least one pure heavy rare earth element is formed and attached to the first surface of the Nd—Fe—B magnet to prevent a reduction in corrosion resistance caused by oxygen and fluorine and hydrogen. After forming the first solidified film, the Nd—Fe—B magnet is subjected a diffusion treatment in a vacuum or an inert atmosphere. After the diffusion treatment, the Nd—Fe—B magnet is subjected to an aging treatment in the vacuum or the inert atmosphere.