METHOD FOR MANUFACTURING RARE EARTH-IRON-BORON BASED SINTERED MAGNET

• Main Authors: UNE YASUHIRO, KUBO HIROICHI
• Format: Patent
• Language: English; Japanese
• Published: 27.09.2018
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CASTING; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; INDUCTANCES; MAGNETS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

PROBLEM TO BE SOLVED: To provide a method for manufacturing a RFeB based sintered magnet, which allows a RFeB based sintered magnet with a RFeGa-containing grain boundary layer formed therein to have a coercive force higher than a conventional one.SOLUTION: A method for manufacturing a RFeB based sintered magnet according to the present invention comprises: a mixed raw material powder-preparing step of preparing mixed raw material powder 11 by mixing first raw material powder 111 of a Ga-containing metal, and second raw material powder 112 consisting of powder of an alloy including a rare earth element R, Fe and B so that the percentage of R content is 30.0-33.0 mass%, the percentage of Fe content is 65.0-68.0 mass%, the percentage of B content is 0.8-0.9 mass%, and the percentage of Ga content is 0.2-0.6 mass%; an orientation step of orienting the mixed raw material powder 11 in a magnetic field; and a sintering step of sintering the mixed raw material powder 11 having gone through the orientation step.SELECTED DRAWING: Figure 1 【課題】R6Fe13Gaを含有する粒界層が形成されたRFeB系焼結磁石において、従来よりも保磁力を高くすることができるRFeB系焼結磁石を製造する方法を提供する。【解決手段】本発明に係るRFeB系焼結磁石製造方法は、Gaを含有する金属から成る第１原料粉末１１１と、希土類元素R、Fe及びBを含有する合金から成る粉末である第２原料粉末１１２を、Rの含有率が30.0〜33.0質量％、Feの含有率が65.0〜68.0質量％、Bの含有率が0.8〜0.9質量％、Gaの含有率が0.2〜0.6質量％となるように混合した混合原料粉末１１を作製する混合原料粉末作製工程と、混合原料粉末１１を磁界中で配向する配向工程と、前記配向工程を行った混合原料粉末１１を焼結する焼結工程とを有する。【選択図】図１