ANISOTROPIC RARE EARTH SINTERED MAGNET AND METHOD FOR PRODUCING THE SAME

• Main Authors: NOMURA, Tadao, KAMATA, Masayuki
• Format: Patent
• Language: English
• Published: 11.05.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; INDUCTANCES; MAGNETS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS

The invention provides an anisotropic rare earth sintered magnet having an Nd2Fe14B-type compound crystal as a main phase and containing Ce, and exhibiting good magnetic characteristics, and a method for producing the same. The anisotropic rare earth sintered magnet has a composition of a formula Rx(Fe1−aCoa)100−x−y−zByMz (where R is two or more kinds of elements selected from rare earth elements and indispensably including Nd and Ce), in which the main phase is formed of an Nd2Fe14B-type compound crystal, main phase grains such that the Ce/R′ ratio in the center part of the grains (where R′ is one or more kinds of elements selected from rare earth elements and indispensably including Nd) is lower than the Ce/R′ ratio in the outer shell part thereof exist, and a Ce-containing R′-rich phase and a Ce-containing R′(Fe,Co)2 phase exist in the grain boundary part. The production method is for producing the anisotropic rare earth sintered magnet.