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1. WO2006098204 - R-T-B BASED SINTERED MAGNET

Publication Number WO/2006/098204
Publication Date 21.09.2006
International Application No. PCT/JP2006/304509
International Filing Date 08.03.2006
IPC
H01F 1/08 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
1Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
01of inorganic materials
03characterised by their coercivity
032of hard-magnetic materials
04metals or alloys
06in the form of particles, e.g. powder
08pressed, sintered, or bound together
H01F 1/053 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
1Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
01of inorganic materials
03characterised by their coercivity
032of hard-magnetic materials
04metals or alloys
047Alloys characterised by their composition
053containing rare earth metals
CPC
B22F 2999/00
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
2999Aspects linked to processes or compositions used in powder metallurgy
C22C 1/0441
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
1Making alloys
04by powder metallurgy
0433Nickel- or cobalt-based alloys
0441Alloys based on intermetallic compounds of the type rare earth - Co, Ni
C22C 2202/02
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
2202Physical properties
02Magnetic
C22C 33/0278
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
33Making ferrous alloys
02by powder metallurgy
0257characterised by the range of the alloying elements
0278with at least one alloying element having a minimum content above 5%
C22C 38/005
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
005containing rare earths, i.e. Sc, Y, Lanthanides
C22C 38/10
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
10containing cobalt
Applicants
  • TDK株式会社 TDK CORPORATION [JP]/[JP] (AllExceptUS)
  • 加藤 英治 KATO, Eiji [JP]/[JP] (UsOnly)
  • 石坂 力 ISHIZAKA, Chikara [JP]/[JP] (UsOnly)
Inventors
  • 加藤 英治 KATO, Eiji
  • 石坂 力 ISHIZAKA, Chikara
Agents
  • 大場 充 OBA, Mitsuru
Priority Data
2005-07041414.03.2005JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) R-T-B BASED SINTERED MAGNET
(FR) AIMANT FRITTE A BASE DE R-T-B
(JA) R-T-B系焼結磁石
Abstract
(EN)
An R-T-B based sintered magnet having a high residual magnetic flux density and a high coercive force in combination is provided. An R-T-B based sintered magnet, which includes a main phase crystal grain (1) having a core-shell structure comprising an inner shell part (2) and an outer shell part (3) surrounding the inner shell part (2). The concentration of a heavy rare earth element in the inner shell part (2) is lower by 10 % or more than the concentration of a heavy rare earth element around the perimeter of the outer shell part (3), and the main phase crystal grain (1) having a core-shell structure comprising the inner shell part (2) and the outer shell part (3) has a (L/r)ave in the range of 0.03 to 0.40, wherein L: a minimum distance from the perimeter of the main phase crystal grain (1) to the inner shell part (2), r: a diameter of the circle equivalent to the main phase crystal grain (1), and (L/r)ave: an average value of L/r of the main phase crystal grain (1) having a core-shell structure being present in the above sintered article.
(FR)
L’invention concerne un aimant fritté à base de R-T-B ayant une induction magnétique élevée et une force coercitive élevée en combinaison. Un aimant fritté à base de R-T-B, qui comprend un grain cristallin à phase principale (1) ayant une structure à noyau-enveloppe comprenant une partie d’enveloppe interne (2) et une partie d’enveloppe externe (3) entourant la partie d’enveloppe interne (2). La concentration d’un lanthanide lourd dans la partie d’enveloppe interne (2) est inférieure de 10 % ou plus par rapport à la concentration d’un lanthanide lourd autour du périmètre de la partie d’enveloppe externe (3) , et le grain cristallin à phase principale (1) ayant une structure à noyau-enveloppe comprenant la partie d’enveloppe interne (2) et la partie d’enveloppe externe (3) a une (L/r)moy située entre 0,03 et 0,40, où L : une distance minimale du périmètre du grain cristallin à phase principale (1) à la partie d’enveloppe interne (2), r : un diamètre du cercle équivalent au grain cristallin à phase principale (1), et (L/r)moy : une valeur moyenne de L/r du grain cristallin à phase principale (1) ayant une structure à noyau-enveloppe étant présente dans l’article fritté ci-dessus.
(JA)
 高い残留磁束密度及び高い保磁力を兼備するR-T-B系焼結磁石を提供する。   内殻部2と、内殻部2を囲む外殻部3とを含むコア・シェル構造を有する主相結晶粒子1を含み、内殻部2における重希土類元素の濃度が外殻部3の周縁における重希土類元素の濃度よりも10%以上低く、内殻部2及び外殻部3を備える主相結晶粒子1において、(L/r)aveが0.03~0.40の範囲にあるR-T-B系焼結磁石。  L:主相結晶粒子1の周縁から内殻部2までの最短の距離  r:主相結晶粒子1の円相当径  (L/r)ave:当該焼結体中に存在するコア・シェル構造を有する主相結晶粒子1のL/rの平均値
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