Global Patent Index - EP 0542529 A1

EP 0542529 A1 19930519 - Rare earth magnets and alloy powder for rare earth magnets and their manufacturing methods.

Title (en)

Rare earth magnets and alloy powder for rare earth magnets and their manufacturing methods.

Title (de)

Seltenerdmagneten und Legierungspuder für Seltenerdmagneten und Herstellungsverfahren.

Title (fr)

Aimants à terre rare et poudre en alliage pour aimants à terre rare et procédé de fabrication.

Publication

EP 0542529 A1 19930519 (EN)

Application

EP 92310299 A 19921111

Priority

  • JP 32377991 A 19911111
  • JP 9378092 A 19920319
  • JP 12418092 A 19920416
  • JP 17476792 A 19920608
  • JP 17619992 A 19920609

Abstract (en)

For the purpose of establishing the manufacturing method to obtain the Fe3B type Fe-Co-B-R-M system high performance resin bonded magnet which possesses improved iHc and (BH)max and can be reliably mass produced, the specific composition of Fe-Co-B-R(Pr,Nd)-M(Ag,Al,Si,Ga,Cu,Au) type molten alloy was rapidly solidified by the melt-quenching or atomization methods, or a combination of the two methods to obtain more than 90% of the solid in an essentially amorphous structure. After the temperature was raised at the rate of 1 SIMILAR 15 DEG C/min., the alloy was heat treated at 550-730 DEG C for 5 minutes SIMILAR 6hours to obtain Fe-rich the boron compound phase, which crystallizes the body centered tetragonal Fe3P type crystalline structure, and the Nd2Fe14B type crystalline structure phase both coexisting as fine crystalline clusters of the average crystalline diameter of 5nm SIMILAR 100nm. The alloy powder which contains the ferromagnetic phase, where the boron compound phase and the Nd2Fe14B type phase coexist, is combined with resin to produce the high performance resin bonded magnet with iHc>/=3kOe,Br>/=5kG, and (BH)max>/=3MGOe.

IPC 1-7

H01F 1/053

IPC 8 full level

C22C 1/04 (2006.01); H01F 1/057 (2006.01)

CPC (source: EP)

C22C 1/0441 (2013.01); H01F 1/0571 (2013.01); H01F 1/0578 (2013.01)

Citation (search report)

  • [Y] PATENT ABSTRACTS OF JAPAN vol. 12, no. 65 (E-586)27 February 1988 & JP-A-62 208 609 ( NAMIKI PRECISION JEWEL CO ) 12 September 1987
  • [Y] DIGESTS OF INTERMAG 17 April 1990, BRIGHTON GB page 15 D.ECKERT ET AL 'TEMPERATURE DEPENDENCE OF THE COERCIVE FORCE IN Nd4Fe77B19'
  • [A] IEEE TRANSACTIONS ON MAGNETICS. vol. 25, no. 5, September 1989, NEW YORK US pages 4111 - 4113 V.PANCHANATHAN ET AL
  • [A] PATENT ABSTRACTS OF JAPAN vol. 14, no. 324 (E-951)(4267) 11 July 1990 & JP-A-02 109 303 ( HTACHI METALS LTD ) 23 April 1990
  • [A] PATENT ABSTRACTS OF JAPAN vol. 11, no. 355 (E-558)(2802) 19 November 1987 & JP-A-62 132 302 ( SUMITOMO METAL MINING CO LTD ) 15 June 1987
  • [A] PATENT ABSTRACTS OF JAPAN vol. 14, no. 270 (C-727)(4213) 12 June 1990 & JP-A-02 280 538 ( HTACHI METALS LTD ) 20 March 1990

Designated contracting state (EPC)

BE DE GB IT NL

DOCDB simple family (publication)

EP 0542529 A1 19930519; EP 0542529 B1 19960731; CN 1053988 C 20000628; CN 1085007 A 19940406; DE 69212569 D1 19960905; DE 69212569 T2 19970206

DOCDB simple family (application)

EP 92310299 A 19921111; CN 92114394 A 19921110; DE 69212569 T 19921111