MANUFACTURING METHOD OF R-T-B SYSTEM PERMANENT MAGNET

• Main Author: MASUZAWA KIYOYUKI
• Format: Patent
• Language: English; Japanese
• Published: 10.12.2020
• Subjects: BASIC ELECTRIC ELEMENTS; CASTING; ELECTRICITY; INDUCTANCES; MAGNETS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TRANSPORTING; WORKING METALLIC POWDER

To provide a manufacturing method of an R-T-B system permanent magnet capable of diffusing a heavy rare earth element uniformly into a magnet base material.SOLUTION: A manufacturing method of a permanent magnet uses a diffusion material sheet 4 containing a heavy rare earth element and a binder. The manufacturing method of permanent magnet includes an adhesion step for adhering vehicle to the surface of at least one of a magnet base material 2 and the diffusion material sheet 4, a coating step of coating the surface of the magnet base material 2 with the diffusion material sheet 4 at least partially so that the diffusion material sheet 4 comes into contact with the magnet base material 2 on the surface to which the vehicle is adhering, and a diffusion step of diffusing the heavy rare earth element into the magnet base material 2, by heating the diffusion material sheet 4 and the magnet base material 2 after the coating step. The magnet base material 2 contains a rare earth element R, a transition metal element T, and boron. At least a part of the rare earth element R is neodymium. At least a part of the transition metal element T is iron.SELECTED DRAWING: Figure 1 【課題】重希土類元素を磁石基材の内部へ均一に拡散させることができるＲ-Ｔ-Ｂ系永久磁石の製造方法の提供。【解決手段】永久磁石の製造方法は、重希土類元素及びバインダを含む拡散材シート４を用いる。永久磁石の製造方法は、磁石基材２及び拡散材シート４のうち少なくとも一方の表面に溶剤を付着させる付着工程と、溶剤が付着した表面において拡散材シート４が磁石基材２に接するように、磁石基材２の表面の少なくとも一部を、拡散材シート４で覆う被覆工程と、被覆工程後、拡散材シート４及び磁石基材２を加熱することにより、重希土類元素を磁石基材２内へ拡散させる拡散工程と、を備える。磁石基材２は、希土類元素Ｒ、遷移金属元素Ｔ、及びホウ素を含む。少なくとも一部の希土類元素Ｒが、ネオジムである。少なくとも一部の遷移金属元素Ｔが、鉄である。【選択図】図１