R-Fe-B RARE-EARTH SINTERED MAGNET AND PROCESS FOR PRODUCING THE SAME

An R-Fe-B rare-earth sintered magnetic object is prepared which has, as the main phase, R2Fe14B type compound crystal grains containing a light rare-earth element (RL) (at least either of Nd and Pr) as the main rare-earth element (R). Subsequently, an M layer comprising one or more metallic elements...

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Bibliographic Details
Main Authors ODAKA, TOMOORI, NOUMI, MASAO, MORIMOTO, HIDEYUKI
Format Patent
LanguageEnglish
French
Japanese
Published 09.08.2007
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
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Summary:An R-Fe-B rare-earth sintered magnetic object is prepared which has, as the main phase, R2Fe14B type compound crystal grains containing a light rare-earth element (RL) (at least either of Nd and Pr) as the main rare-earth element (R). Subsequently, an M layer comprising one or more metallic elements (M) (M is at least one member selected from the group consisting of Al, Ga, In, Sn, Pb, Bi, Zn, and Ag) is deposited on the surface of the sintered magnetic object. An RH layer comprising one or more heavy rare-earth elements (RH) (at least one member selected from the group consisting of Dy, Ho, and Tb) is then deposited on the M layer. Thereafter, the resultant sintered magnetic object is heated to diffuse the metallic elements (M) from the surface into inner parts of the sintered magnet and diffuse the heavy rare-earth elements (RH) from the surface into inner parts of the sintered magnet. L'invention concerne un objet magnétique fritté R-Fe-B et terre rare dont la phase principale est formée de grains cristallins d'un composé de type R2Fe14B contenant un élément choisi parmi les terres rares légères (RL) (qui soit au moins Nd ou Pr) en tant qu'élément terre rare principal (R). Ensuite, une couche M comprenant un ou plusieurs éléments métalliques (M) (M étant au moins un élément choisi dans le groupe comprenant Al, Ga, In, Sn, Pb, Bi, Zn et Ag) est déposée sur la surface de l'objet magnétique fritté. Une couche RH comprenant un ou plusieurs élément choisis parmi les terres rares lourdes (RH) (l'un au moins de ces éléments étant choisi dans le groupe comprenant Dy, Ho et Tb) est ensuite déposée sur la couche M. L'objet magnétique fritté ainsi obtenu est alors chauffé afin de diffuser les éléments métalliques (M) et les terres rares lourdes (RH) depuis la surface jusque dans des parties intérieures de l'aimant fritté.
Bibliography:Application Number: WO2007JP50304