RARE EARTH PERMANENT MAGNET

To obtain a rare earth permanent magnet having a high residual magnetic flux density and a high magnetic coercive force.SOLUTION: A rare earth permanent magnet contains R and T. The R is a rare earth element essentially comprising Sm, and the T is a single Fe or Fe and Co. The rare earth permanent m...

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Bibliographic Details
Main Authors FUKUCHI EIICHIRO, SAITO TETSUJI, ITO MASASHI
Format Patent
LanguageEnglish
Japanese
Published 05.12.2019
Subjects
ALLOYS
BASIC ELECTRIC ELEMENTS
CHEMISTRY
ELECTRICITY
FERROUS OR NON-FERROUS ALLOYS
INDUCTANCES
MAGNETS
METALLURGY
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary:To obtain a rare earth permanent magnet having a high residual magnetic flux density and a high magnetic coercive force.SOLUTION: A rare earth permanent magnet contains R and T. The R is a rare earth element essentially comprising Sm, and the T is a single Fe or Fe and Co. The rare earth permanent magnet contains a crystal particle having NdFe-type crystal structure as a main phase. At least one part of the crystal particle is a flat particle having a flat shape. In the case of measuring a frequency distribution of a long diameter in the crystal particle, a means long diameter in the crystal particle of which a cumulative frequency is 10% or more and 90% or less exceeds 300 nm.SELECTED DRAWING: None 【課題】残留磁束密度および保磁力が高い希土類永久磁石を得る。【解決手段】ＲおよびＴを含む希土類永久磁石である。ＲはＳｍを必須とする希土類元素、ＴはＦｅ単独またはＦｅおよびＣｏである。希土類永久磁石は、Ｎｄ５Ｆｅ１７型結晶構造を有する結晶粒子を主相として含む。結晶粒子の少なくとも一部が扁平な形状を有する扁平粒子である。前記結晶粒子の長径の頻度分布を測定した場合に累積頻度１０％以上９０％以下である結晶粒子における平均長径が３００ｎｍ超である。【選択図】なし
Bibliography:Application Number: JP20180102692