EP0923780A1 - AIMANT PERMANENT CONSTITUE D'UN ELEMENT DES TERRES RARES, DE Fe ET DE B, ET SON PROCEDE DE PRODUCTION - Google Patents

AIMANT PERMANENT CONSTITUE D'UN ELEMENT DES TERRES RARES, DE Fe ET DE B, ET SON PROCEDE DE PRODUCTION

Info

Publication number
EP0923780A1
EP0923780A1 EP97939964A EP97939964A EP0923780A1 EP 0923780 A1 EP0923780 A1 EP 0923780A1 EP 97939964 A EP97939964 A EP 97939964A EP 97939964 A EP97939964 A EP 97939964A EP 0923780 A1 EP0923780 A1 EP 0923780A1
Authority
EP
European Patent Office
Prior art keywords
rare earth
earth element
permanent magnet
alloy
phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97939964A
Other languages
German (de)
English (en)
Other versions
EP0923780B1 (fr
Inventor
Peter Schrey
Mircea Velicescu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP0923780A1 publication Critical patent/EP0923780A1/fr
Application granted granted Critical
Publication of EP0923780B1 publication Critical patent/EP0923780B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
    • H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered

Definitions

  • the invention relates to a permanent magnet of the SE-Fe-B type, which has the tetragonal phase SE 2 Fe_.B as the main phase, SE being at least one rare earth element including Y.
  • Such a magnet is known for example from EP 0 124 655 AI and the corresponding US Pat. No. 5,230,751.
  • SE-Fe-B magnets have the highest energy densities available today.
  • MetallE-Fe-B magnets manufactured by powder metallurgy contain about 90% of the hard magnetic main phase SEFe - .. B.
  • a two-phase magnet is known from DE 41 35 403 C2, the second phase being an SE-Fe-Co-Ga phase.
  • a two-phase magnet is also known from EP 0 583 041 A1, the second phase consisting of an SE-Ga phase.
  • a 5E transition metal Ga phase is known from US Pat. No. 5,447,578.
  • the manufacturing process generally involves composing these SE-FE-B magnets from SE-Fe-B base alloys with a composition close to the SE 2 Fe ⁇ .B phase and from a binder alloy with a lower melting temperature become.
  • the aim is that the structure of the SE-Fe-B sintered magnet made of SE 2 Fe_.B base alloys with intergranular binders is adjusted using as little binder alloy as possible.
  • this binder alloy With a proportion of this binder alloy of more than 10% by weight, the grain growth is strongly activated, but the pores are not closed. The result is the formation of a structure with abnormally large grains (> 50 ⁇ m) and with high porosity and with low sintered densities. With low proportions of binder alloy, the amount of the liquid phase is therefore not sufficient for the compression.
  • the object is achieved by a permanent magnet which additionally has an iron and boron-free phase, of the general formula SE 5 (Co, Ga) 3 , in which SE 'is at least one rare earth element including Y.
  • the permanent magnet according to the invention is expediently produced using a method which comprises the following steps: a.) It is a powder made from a basic alloy of the general formula
  • SE 2 TnB in which SE is at least one rare earth element including Y and T is Fe or a combination of Fe and Co, the Co content not exceeding 40% by weight of the combination of Fe and Co, a 2 ) and a powder from a binder alloy of the general formula
  • SE ' 5 T 3 wherein SE' is at least one rare earth element including Y and T is a combination of Co and Ga, mixed in a weight ratio of 99: 1 to 70:30, b) the mixture is compacted and then c) sintered under vacuum and / or under an inert gas atmosphere.
  • the scanning electron microscope examinations showed that the structure of the binder alloy mainly consists of a 5/3 phase.
  • the DTA / DDTA curves of coarse powder of the binder alloy show endothermic maxi a in the temperature range 530 to 610 ° C. They correspond to the melting temperatures of 5/3 phases and depend on the Pr, Nd and Dy proportions.
  • the mixtures were finely ground in a planetary ball mill for 90 minutes, the average particle size of the fine powder reached 2.9 to 3.0 ⁇ m.
  • Anisotropic, isostatically pressed magnets were produced from the fine powders. They were sintered to densities of p> 7.50 g / cm 3 and then annealed.
  • Figures 1 and 2 show the de-magnetization curves at room temperature of the respective magnets.
  • the same basic alloy as the magnet 322/1 from Example 1 was used as the basic alloy.
  • FIG. 3 shows the demagnetization curve of this magnet, which is based on the conventional powder metallurgical method
  • the permanent magnets according to the invention have a much more favorable demagnetization curve at room temperature than permanent magnets which have been produced according to the prior art.
  • the highest coercive field strength was achieved with the magnet 322/1 after tempering at a temperature of 630 ° C.
  • the magnet 322/1 which was sintered at a temperature of 1080 ° C., reached a coercive force of 10.4 kOe, its remanence being 1.41 T.
  • a degree of alignment of the grains of 96% was measured in this magnet and the relative density is 98%.
  • Mathematically, a remanence of 1.415 T is to be expected, i.e. a very good agreement with the measured value.
  • the present invention presents a new boron- and iron-free alloy with the composition SE 5 (Co, Ga) -> for the production of permanent magnets.
  • the melting temperature of this alloy is about 530 ° C.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

L'invention concerne un nouvel alliage de liaison exempt de bore et de fer, dont la composition est: SE5(Co,GA)3, où SE représente un élément des terres rares, pour la production d'aimants permanents du type SE2Fe14B, où SE représente un élément des terres rares.
EP97939964A 1996-09-06 1997-08-19 AIMANT PERMANENT CONSTITUE D'UN ELEMENT DES TERRES RARES, DE Fe ET DE B, ET SON PROCEDE DE PRODUCTION Expired - Lifetime EP0923780B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19636284 1996-09-06
DE19636284A DE19636284C2 (de) 1996-09-06 1996-09-06 SE-Fe-B-Dauermagnet und Verfahren zu seiner Herstellung
PCT/DE1997/001784 WO1998010436A1 (fr) 1996-09-06 1997-08-19 AIMANT PERMANENT CONSTITUE D'UN ELEMENT DES TERRES RARES, DE Fe ET DE B, ET SON PROCEDE DE PRODUCTION

Publications (2)

Publication Number Publication Date
EP0923780A1 true EP0923780A1 (fr) 1999-06-23
EP0923780B1 EP0923780B1 (fr) 2002-11-06

Family

ID=7804874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97939964A Expired - Lifetime EP0923780B1 (fr) 1996-09-06 1997-08-19 AIMANT PERMANENT CONSTITUE D'UN ELEMENT DES TERRES RARES, DE Fe ET DE B, ET SON PROCEDE DE PRODUCTION

Country Status (6)

Country Link
US (1) US6254659B1 (fr)
EP (1) EP0923780B1 (fr)
JP (1) JP3145415B2 (fr)
KR (1) KR20000068482A (fr)
DE (2) DE19636284C2 (fr)
WO (1) WO1998010436A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6464934B2 (en) * 1996-09-06 2002-10-15 Vacuumschmelze Gmbh Method for manufacturing a rare earth element—iron—boron permanent magnet
DE10025458B4 (de) * 2000-05-23 2005-05-12 Vacuumschmelze Gmbh Magnet und Verfahren zu dessen Herstellung
CN101958171B (zh) * 2010-04-14 2012-02-15 无锡南理工科技发展有限公司 一种耐腐蚀烧结钕铁硼磁体的制备方法
CN104576022B (zh) * 2014-12-03 2017-06-27 中国科学院宁波材料技术与工程研究所 稀土永磁体的制备方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124655B1 (fr) * 1983-05-06 1989-09-20 Sumitomo Special Metals Co., Ltd. Aimants permanents isotropes et procédé pour leur fabrication
US5230751A (en) * 1986-07-23 1993-07-27 Hitachi Metals, Ltd. Permanent magnet with good thermal stability
US5447578A (en) * 1989-10-12 1995-09-05 Kawasaki Steel Corporation Corrosion-resistant rare earth metal-transition metal series magnets and method of producing the same
DE69202515T2 (de) 1991-06-04 1995-09-21 Shinetsu Chemical Co Verfahren zur Herstellung von zweiphasigen Dauermagneten auf der Basis von Seltenen Erden.
JP2853838B2 (ja) * 1991-06-04 1999-02-03 信越化学工業株式会社 希土類永久磁石の製造方法
US5405455A (en) * 1991-06-04 1995-04-11 Shin-Etsu Chemical Co. Ltd. Rare earth-based permanent magnet
DE4135403C2 (de) * 1991-10-26 1994-06-16 Vacuumschmelze Gmbh SE-Fe-B-Dauermagnet und Verfahren zu seiner Herstellung
CN1044940C (zh) * 1992-08-13 1999-09-01 Ybm麦格奈克斯公司 基于钕铁硼的生产永久磁铁的方法
EP0583041B1 (fr) * 1992-08-13 1997-02-05 Koninklijke Philips Electronics N.V. Procédé pour la fabrication d'un aimant permanent à base de NdFeB
US5595608A (en) * 1993-11-02 1997-01-21 Tdk Corporation Preparation of permanent magnet

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9810436A1 *

Also Published As

Publication number Publication date
JP3145415B2 (ja) 2001-03-12
WO1998010436A1 (fr) 1998-03-12
DE19636284A1 (de) 1998-03-12
DE59708681D1 (de) 2002-12-12
KR20000068482A (ko) 2000-11-25
JP2000503809A (ja) 2000-03-28
EP0923780B1 (fr) 2002-11-06
DE19636284C2 (de) 1998-07-16
US6254659B1 (en) 2001-07-03

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