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1. (WO2012099188) R-T-B SINTERED MAGNET
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2012/099188    International Application No.:    PCT/JP2012/051038
Publication Date: 26.07.2012 International Filing Date: 19.01.2012
IPC:
H01F 1/053 (2006.01), B22F 3/24 (2006.01), C22C 38/00 (2006.01), H01F 1/08 (2006.01)
Applicants: HITACHI METALS, LTD. [JP/JP]; 2-1, Shibaura 1-chome, Minato-ku, Tokyo 1058614 (JP) (For All Designated States Except US).
KUNIYOSHI Futoshi [JP/JP]; (JP) (For US Only)
Inventors: KUNIYOSHI Futoshi; (JP)
Agent: OKUDA Seiji; OKUDA & ASSOCIATES, 10th Floor, Osaka Securities Exchange Bldg., 8-16, Kitahama 1-chome, Chuo-ku, Osaka-shi, Osaka 5410041 (JP)
Priority Data:
2011-008434 19.01.2011 JP
Title (EN) R-T-B SINTERED MAGNET
(FR) AIMANT FRITTÉ EN R-T-B
(JA) R-T-B系焼結磁石
Abstract: front page image
(EN)This R-T-B rare earth sintered magnet is an R-Fe-B rare earth sintered magnet which has as the main phase R2Fe14B-based compound crystal particles containing a light rare earth element RL (including at least one of Nd and Pr) as the main rare earth element R, and which contains a heavy rare metal element RH (including at least one of Dy and Tb). Prior to removal of the surface layer, this R-T-B rare earth sintered magnet has no layer rich in rare-earth element R on the surface layer, has a site where the coercivity gradually decreases from the surface layer towards the center of the R-T-B rare earth sintered magnet, and the difference between the TRE amount from the surface layer up to 500μm towards the center of the R-T-B rare earth sintered magnet and the TRE amount in the center of the R-T-B rare earth sintered magnet is 0.1-1.0.
(FR)L'invention concerne un aimant fritté en terres rares R-T-B qui est un aimant fritté en terres rares R-T-B qui contient comme phase principale des particules cristallines d'un composé R2Fe14B contenant un élément des terres rares léger RL (comprenant au moins l'un parmi Nd et Pr) comme élément des terres rares principal R et qui contient un élément des terres rares lourd RH (comprenant au moins l'un parmi Dy et Tb). Avant d'éliminer la couche superficielle, cet aimant fritté en terres rares R-T-B ne possède pas de couche riche en élément des terres rares R dans la couche superficielle, possède un site où la coercibilité qui diminue graduellement à partir de la couche superficielle en direction du centre de l'aimant fritté en terres rares R-T-B et la différence de quantité de TRE dans la souche superficielle et jusqu'à une distance de 500 µm en direction du centre de l'aimant fritté en terres rares R-T-B et le centre de l'aimant fritté en terres rares R-T-B est de 0,1 à 1,0.
(JA) このR-T-B系希土類焼結磁石は、軽希土類元素RL(NdおよびPrの少なくとも1種を含む)を主たる希土類元素Rとして含有するR2Fe14B型化合物結晶粒を主相として有し、重希土類元素RH(Dy、Tbの少なくとも1種を含む)を含有するR-Fe-B系希土類焼結磁石であって、前記R-T-B系希土類焼結磁石の表層を除去する前において、R-T-B系希土類焼結磁石の表層に希土類元素Rの濃縮層を有さず、かつR-T-B系希土類焼結磁石の表層から中心部に向かって、保磁力が漸減する部位を有し、前記R-T-B系希土類焼結磁石の表層から中心部に向かって500μmまでのTRE量と前記R-T-B系希土類焼結磁石の中心部のTRE量との差が0.1以上1.0以下である。
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)