EP0468903A1 - Herstellungsverfahren von Seltenerdübergangsmetall-Bortyp-Magnetpulver für korrosionsfeste Magnete - Google Patents

Herstellungsverfahren von Seltenerdübergangsmetall-Bortyp-Magnetpulver für korrosionsfeste Magnete Download PDF

Info

Publication number: EP0468903A1
Authority: EP; European Patent Office
Prior art keywords: log; magnets; rare earth; under; temperature
Prior art date: 1990-07-25
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

EP91420269A

Other languages

English (en)

French (fr)

Other versions

EP0468903B1 (de

Inventor

Armand Gabriel

Masato Sagawa

Philippe Tenaud

Pierre Turillon

Fernand Vial

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.)

Ugimag SA

Original Assignee

Aimants Ugimac SA

Ugimag SA

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.)

1990-07-25

Filing date

1991-07-23

Publication date

1992-01-29

1991-07-23 Application filed by Aimants Ugimac SA, Ugimag SA filed Critical Aimants Ugimac SA

1991-07-23 Priority to AT91420269T priority Critical patent/ATE101451T1/de

1992-01-29 Publication of EP0468903A1 publication Critical patent/EP0468903A1/de

1994-02-09 Application granted granted Critical

1994-02-09 Publication of EP0468903B1 publication Critical patent/EP0468903B1/de

2011-07-23 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

238000000034 method Methods 0.000 title claims abstract description 23
230000007797 corrosion Effects 0.000 title claims abstract description 18
238000005260 corrosion Methods 0.000 title claims abstract description 18
239000000696 magnetic material Substances 0.000 title claims abstract description 5
229910052796 boron Inorganic materials 0.000 title description 3
239000000463 material Substances 0.000 claims abstract description 20
239000001257 hydrogen Substances 0.000 claims abstract description 19
229910052739 hydrogen Inorganic materials 0.000 claims abstract description 19
UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 16
150000004678 hydrides Chemical class 0.000 claims description 13
229910052761 rare earth metal Inorganic materials 0.000 claims description 8
-1 rare earth hydride Chemical class 0.000 claims description 3
XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
230000005291 magnetic effect Effects 0.000 description 11
150000002910 rare earth metals Chemical class 0.000 description 11
238000006243 chemical reaction Methods 0.000 description 9
238000005245 sintering Methods 0.000 description 9
239000000956 alloy Substances 0.000 description 8
229910045601 alloy Inorganic materials 0.000 description 8
230000015572 biosynthetic process Effects 0.000 description 8
230000036571 hydration Effects 0.000 description 8
238000006703 hydration reaction Methods 0.000 description 8
239000000843 powder Substances 0.000 description 8
238000011282 treatment Methods 0.000 description 8
238000000227 grinding Methods 0.000 description 7
238000004845 hydriding Methods 0.000 description 7
230000008569 process Effects 0.000 description 6
238000007323 disproportionation reaction Methods 0.000 description 5
239000007789 gas Substances 0.000 description 5
239000000203 mixture Substances 0.000 description 5
238000012360 testing method Methods 0.000 description 5
QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
238000000280 densification Methods 0.000 description 4
239000001301 oxygen Substances 0.000 description 4
229910052760 oxygen Inorganic materials 0.000 description 4
230000035945 sensitivity Effects 0.000 description 4
229910017052 cobalt Inorganic materials 0.000 description 3
239000010941 cobalt Substances 0.000 description 3
GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
238000007906 compression Methods 0.000 description 3
230000006835 compression Effects 0.000 description 3
238000000354 decomposition reaction Methods 0.000 description 3
239000008187 granular material Substances 0.000 description 3
238000010438 heat treatment Methods 0.000 description 3
150000002431 hydrogen Chemical class 0.000 description 3
229910052742 iron Inorganic materials 0.000 description 3
230000003647 oxidation Effects 0.000 description 3
238000007254 oxidation reaction Methods 0.000 description 3
XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
101100080844 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) ndh-3 gene Proteins 0.000 description 2
238000007792 addition Methods 0.000 description 2
229910052791 calcium Inorganic materials 0.000 description 2
239000011575 calcium Substances 0.000 description 2
238000009792 diffusion process Methods 0.000 description 2
230000004927 fusion Effects 0.000 description 2
238000004519 manufacturing process Methods 0.000 description 2
229910052751 metal Inorganic materials 0.000 description 2
239000002184 metal Substances 0.000 description 2
239000002245 particle Substances 0.000 description 2
230000009467 reduction Effects 0.000 description 2
239000007787 solid Substances 0.000 description 2
238000006467 substitution reaction Methods 0.000 description 2
230000009466 transformation Effects 0.000 description 2
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
229910052692 Dysprosium Inorganic materials 0.000 description 1
GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 1
229910052779 Neodymium Inorganic materials 0.000 description 1
229910052777 Praseodymium Inorganic materials 0.000 description 1
238000002441 X-ray diffraction Methods 0.000 description 1
229910052782 aluminium Inorganic materials 0.000 description 1
XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
229910052786 argon Inorganic materials 0.000 description 1
238000007664 blowing Methods 0.000 description 1
239000011248 coating agent Substances 0.000 description 1
238000000576 coating method Methods 0.000 description 1
150000001875 compounds Chemical class 0.000 description 1
239000000470 constituent Substances 0.000 description 1
238000010276 construction Methods 0.000 description 1
238000007796 conventional method Methods 0.000 description 1
229910052802 copper Inorganic materials 0.000 description 1
239000010949 copper Substances 0.000 description 1
RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
238000005336 cracking Methods 0.000 description 1
238000005520 cutting process Methods 0.000 description 1
230000001351 cycling effect Effects 0.000 description 1
230000006378 damage Effects 0.000 description 1
230000007423 decrease Effects 0.000 description 1
230000007547 defect Effects 0.000 description 1
238000007872 degassing Methods 0.000 description 1
230000018044 dehydration Effects 0.000 description 1
238000006297 dehydration reaction Methods 0.000 description 1
238000003795 desorption Methods 0.000 description 1
KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 1
239000003822 epoxy resin Substances 0.000 description 1
230000007717 exclusion Effects 0.000 description 1
238000004880 explosion Methods 0.000 description 1
230000005294 ferromagnetic effect Effects 0.000 description 1
238000013467 fragmentation Methods 0.000 description 1
238000006062 fragmentation reaction Methods 0.000 description 1
229910052733 gallium Inorganic materials 0.000 description 1
230000036541 health Effects 0.000 description 1
150000004679 hydroxides Chemical class 0.000 description 1
230000006698 induction Effects 0.000 description 1
230000005415 magnetization Effects 0.000 description 1
238000002844 melting Methods 0.000 description 1
230000008018 melting Effects 0.000 description 1
150000002739 metals Chemical class 0.000 description 1
QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
230000007935 neutral effect Effects 0.000 description 1
229910052757 nitrogen Inorganic materials 0.000 description 1
229920000647 polyepoxide Polymers 0.000 description 1
PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
238000002360 preparation method Methods 0.000 description 1
230000001681 protective effect Effects 0.000 description 1
238000005086 pumping Methods 0.000 description 1
230000009257 reactivity Effects 0.000 description 1
238000011946 reduction process Methods 0.000 description 1
239000003870 refractory metal Substances 0.000 description 1
238000007789 sealing Methods 0.000 description 1
238000001228 spectrum Methods 0.000 description 1
238000003860 storage Methods 0.000 description 1
230000002459 sustained effect Effects 0.000 description 1
229910052723 transition metal Inorganic materials 0.000 description 1
150000003624 transition metals Chemical class 0.000 description 1
230000000007 visual effect Effects 0.000 description 1
229910052727 yttrium Inorganic materials 0.000 description 1
VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1

Classifications

- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/023—Hydrogen absorption
- 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
- H01F1/0573—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 obtained by reduction or by hydrogen decrepitation or embrittlement

Definitions

the invention relates to a method for obtaining, in divided form, magnetic materials of the TR Fe B type which are brittle and relatively inert with respect to air and which lead to magnets with improved corrosion resistance.
TR Fe B By magnetic materials type TR Fe B is meant materials essentially consisting of a magnetic tetragonal phase T1, analogous to TR2 Fe14 B, TR designating one (or more) rare earth (s), including Yttrium, Iron and Boron can be partially substituted, as is known, by other elements such as cobalt, with or without the addition of metals such as aluminum, copper, gallium, etc ... or refractory metals. See EP-A-101552, EP-A-106558, EP-A-344542, and French patent applications Nos 89-16731 and 89-16732.
rare earth is constituted by Neodymium which can be partially replaced by praseodymium and dysprosium.
the magnets of this family have to date, the most efficient magnetic properties in particular with regard to the residual induction (Br), the intrinsic coercivity (H cJ ) and the specific energy [( BH) max ].
the classic method of manufacturing magnets of this type consists in obtaining a fine powder, possibly compressing it under magnetic field and sintering it before various finishes and final magnetization.
hydrogen decrepitation is meant a process for dividing an alloy consisting in subjecting an alloy in pieces to a hydrogen atmosphere under temperature and pressure conditions depending on the alloy and allowing at least partial conversion into a hydride, and then subjecting it to different conditions of temperature and pressure such that the hydride decomposes.
This cycling often leads to a noisy fragmentation of the alloy, which is said to "decrepitate”.
GB 1 313 272 and GB 1 554 384 for binary combinations of a rare earth and a transition metal, mainly cobalt, combinations for which this process has not provided 'major advantages compared to conventional methods of grinding, and therefore has not received significant industrial applications.
the powders Although the grinding, compression and sintering operations can be carried out under protective atmospheres, the powders partially oxidize during their transformation before densification (sintering) by reaction with the residual O2 and / or H2O contents of said atmospheres. This oxidation is particularly strong when the developed surface of the material is large, for example in the stages of pre-grinding, grinding, storage, compression of the powders, and during the rise in sintering temperature. As the Applicant has observed for itself, the method of decrepitation with hydrogen does not make it possible, in the art described above, to resolve these drawbacks.
the applicant has sought a method considerably reducing the reactivity of these materials with respect to atmospheres, in particular those containing oxygen and / or water vapor, and leading to sintered magnets increased resistance to corrosion.
the method according to the invention consists in treating the material (crushed ingot or granules resulting from reduction of oxides) in a reactor where hydrogen is introduced under specific conditions of temperature (T) and pressure (P) defined below, at least in a final phase.
the temperature T is chosen between 350 ° C and 550 ° C and in particular between 350 and 500 ° C if P ⁇ Pa and the conditions 350 + 100 log P / Pa ⁇ T ⁇ 550 + log (P / Pa) and in particular 350 + 100 log (P / Pa) ⁇ T ⁇ 500 + 100 log (P / Pa) if P> Pa.
the temperature is kept above 400 ° C.
reaction kinetics it is preferable to operate with a pressure P greater than or equal to 0.5 atmosphere; in addition, for reasons of safety and simplicity of construction of the treatment enclosure, in particular with regard to its sealing, it is preferable to operate below 1 atmosphere.
hydrogen pressure P is meant its absolute pressure in the case of a gas atmosphere alone, or its partial pressure in the case of a mixture of gases containing hydrogen or of a body providing nascent hydrogen such as ammonia NH3.
temperature T to which H2 is introduced is meant the minimum temperature to which the product is brought by a heat source, independently of the heating which may result from the exothermic hydriding reaction; the actual temperature of the material is that reached by it during its transformation. The duration of treatment depends on the operating conditions used; the reaction is considered to be complete when the hydrogen pressure and the temperature have become constant.
the reactor containing the product is then brought back to the usual temperature, pressure and atmosphere conditions.
TRH2 a TR hydride of formula TR Hx with x between 1.8 and 2.45 -designated here by "TRH2" - to the exclusion of all others; in particular, the formation of a hydride of the standard formula was not detected, under the conditions of the invention TR2 Fe14 B Hy or ⁇ -Fe or a more hydrogenated hydride such as NdH3.
the material at the end of the hydrogen treatment essentially consists of 3 main phases: TR2 Fe14 B, called T1, "TR H2", and a boron-rich phase already described in the prior art.
this rare earth-rich hydride is attributed to the appearance of appreciable friability of the stable and passive hydrogenated products, without creating the hydrated phase of T1.
this friability does not constitute a disadvantage for the health of the tablet during the rise in temperature towards the sintering, since this phase is a minority in volume opposite T1.
the Applicant has found that the hydrogen treatment also leads to brittle materials but comprising significant amounts of the hydride of T1, the hydride NdH3, or of ⁇ -Fe. These materials did not make it possible to obtain magnets resistant to corrosion, see the examples outside the invention.
Tests were carried out on materials obtained by melting, having the following composition (in at%), which is not limiting, which contains a low TR content in order to obtain the highest remanences. They made it possible to test the passivity of the materials obtained under different conditions according to the invention and outside the invention and the quality of corrosion resistance of the final magnets.
the method described in this invention has been successfully applied to other compositions in TR or in B, or comprising substitutions and / or additions described in the prior art (see EP-A-101552, EP-A-106558, EP-A-344542), or alternatively to granules coming from the so-called diffusion reduction process.
the friability was measured by the particle size spectrum (% by weight passing through the sieve, without external constraint) of the material obtained after the hydriding treatment.
the nature of the phases present in the hydrated material was determined by X-ray diffraction.
the magnetic characteristics - B r and H cJ - were determined on sintered magnets, prepared according to the process recalled in the introduction, and without extreme precautions for handling atmospheres.
the corrosion resistance of sintered magnets has been estimated by their service life in autoclave at 115 ° C, under 0.175 MPa at 100% relative humidity. In all cases, the magnets were coated before testing under identical conditions, with an epoxy resin after a surface preparation (phosphating). The resistance of the coating was estimated by visual examination (blisters) and by the cross-cutting test.
Examples 1, 6 and 7 relate to the prior art, or to conditions outside the invention, the other tests (Examples 2 to 5 and 8) relate to the invention.
Example 1 shows that under conditions close to those of the prior art (25 ° C. at around 0.1 MPa of H2), and for the composition exemplified a duration of 4 days is the maximum that the magnet coated in an autoclave, before blistering occurs, a sign of corrosion.
Example 2 shows that hydriding at 300 ° C under conditions representative of the invention leads to a considerably increased autoclave lifetime (+ 100%) compared to Example 1, which may be related to an improved compactness.
Example 6 shows that at 550 ° C, there is no longer any embrittlement. Mechanical pre-grinding is then necessary. Densification becomes difficult; the service lives in the autoclave are extremely short, as are the magnetic properties, no doubt due to the presence of numerous open porosities.
example 8 At 700 ° C. (example 8), the magnetic properties as well as the corrosion resistance are optimal, similar to those of example 2.

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Chemical & Material Sciences (AREA)
Crystallography & Structural Chemistry (AREA)
Inorganic Chemistry (AREA)
Engineering & Computer Science (AREA)
Power Engineering (AREA)
Hard Magnetic Materials (AREA)
Powder Metallurgy (AREA)
Preventing Corrosion Or Incrustation Of Metals (AREA)
Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Reciprocating, Oscillating Or Vibrating Motors (AREA)
Manufacturing Cores, Coils, And Magnets (AREA)

EP91420269A 1990-07-25 1991-07-23 Herstellungsverfahren von Seltenerdübergangsmetall-Bortyp-Magnetpulver für korrosionsfeste Magnete Expired - Lifetime EP0468903B1 (de)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT91420269T ATE101451T1 (de)	1990-07-25	1991-07-23	Herstellungsverfahren von seltenerduebergangsmetall-bortyp-magnetpulver fuer korrosionsfeste magnete.

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
FR909009722A FR2665295B1 (fr)	1990-07-25	1990-07-25	Methode d'obtention sous forme divisee d'un materiau magnetique de type terre-rare - metaux de transition - bore pour des aimants resistant a la corrosion.
FR9009722		1990-07-25

Publications (2)

Publication Number	Publication Date
EP0468903A1 true EP0468903A1 (de)	1992-01-29
EP0468903B1 EP0468903B1 (de)	1994-02-09

Family

ID=9399244

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP91420269A Expired - Lifetime EP0468903B1 (de)	1990-07-25	1991-07-23	Herstellungsverfahren von Seltenerdübergangsmetall-Bortyp-Magnetpulver für korrosionsfeste Magnete

Country Status (12)

Country	Link
US (1)	US5221368A (de)
EP (1)	EP0468903B1 (de)
JP (1)	JP2933293B2 (de)
AT (1)	ATE101451T1 (de)
CA (1)	CA2046478A1 (de)
DE (1)	DE69101155T2 (de)
ES (1)	ES2050519T3 (de)
FI (1)	FI107303B (de)
FR (1)	FR2665295B1 (de)
HK (1)	HK39195A (de)
IE (1)	IE66827B1 (de)
SG (1)	SG29795G (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5788782A (en) *	1993-10-14	1998-08-04	Sumitomo Special Metals Co., Ltd.	R-FE-B permanent magnet materials and process of producing the same
JP2881409B2 (ja) *	1996-10-28	1999-04-12	愛知製鋼株式会社	異方性磁石粉末の製造方法
JP3452254B2 (ja) *	2000-09-20	2003-09-29	愛知製鋼株式会社	異方性磁石粉末の製造方法、異方性磁石粉末の原料粉末およびボンド磁石

Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0280372A1 (de) *	1987-02-27	1988-08-31	Philips Electronics Uk Limited	Verfahren zur Erzeugung von Seltenerd-Übergangsmetall-Legierungsmagneten

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS60119701A (ja) *	1983-12-01	1985-06-27	Sumitomo Special Metals Co Ltd	希土類・ボロン・鉄系永久磁石用合金粉末の製造方法
JPS6390104A (ja) *	1986-10-03	1988-04-21	Tdk Corp	希土類−鉄−ホウ素系永久磁石の製造方法
JPS6448403A (en) *	1987-08-19	1989-02-22	Mitsubishi Metal Corp	Rare earth-iron-boron magnet powder and manufacture thereof
EP0304054B1 (de) *	1987-08-19	1994-06-08	Mitsubishi Materials Corporation	Magnetisches Seltenerd-Eisen-Bor-Puder und sein Herstellungsverfahren
JP2564492B2 (ja) *	1987-10-13	1996-12-18	三菱マテリアル株式会社	希土類−Ｆｅ−Ｂ系鋳造体永久磁石の製造法
US5091020A (en) *	1990-11-20	1992-02-25	Crucible Materials Corporation	Method and particle mixture for making rare earth element, iron and boron permanent sintered magnets

1990
- 1990-07-25 FR FR909009722A patent/FR2665295B1/fr not_active Expired - Fee Related
1991
- 1991-07-08 CA CA002046478A patent/CA2046478A1/fr not_active Abandoned
- 1991-07-23 AT AT91420269T patent/ATE101451T1/de not_active IP Right Cessation
- 1991-07-23 EP EP91420269A patent/EP0468903B1/de not_active Expired - Lifetime
- 1991-07-23 DE DE69101155T patent/DE69101155T2/de not_active Expired - Fee Related
- 1991-07-23 ES ES91420269T patent/ES2050519T3/es not_active Expired - Lifetime
- 1991-07-24 IE IE260791A patent/IE66827B1/en not_active IP Right Cessation
- 1991-07-24 FI FI913546A patent/FI107303B/fi not_active IP Right Cessation
- 1991-07-25 US US07/735,893 patent/US5221368A/en not_active Expired - Lifetime
- 1991-07-25 JP JP3186579A patent/JP2933293B2/ja not_active Expired - Fee Related
1995
- 1995-02-20 SG SG29795A patent/SG29795G/en unknown
- 1995-03-16 HK HK39195A patent/HK39195A/xx not_active IP Right Cessation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0280372A1 (de) *	1987-02-27	1988-08-31	Philips Electronics Uk Limited	Verfahren zur Erzeugung von Seltenerd-Übergangsmetall-Legierungsmagneten

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON MAGNETICS. vol. 22, no. 5, septembre 1986, NEW YORK US pages 735 - 737; R.J.Pollard et Al.: "NOVEL RECORDING MEDIA:Fe14R2B PARTICLES" *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 324 (E-653)(3171) 02 septembre 1988, & JP-A-63 90104 (TDK CORP) 21 avril 1988, *
PATENT ABSTRACTS OF JAPAN vol. 9, no. 277 (E-355)(2000) 06 novembre 1985, & JP-A-60 119701 (SUMITOMO) 27 juin 1985, *

Also Published As

Publication number	Publication date
DE69101155T2 (de)	1994-06-01
FI107303B (fi)	2001-06-29
ATE101451T1 (de)	1994-02-15
DE69101155D1 (de)	1994-03-24
JP2933293B2 (ja)	1999-08-09
IE912607A1 (en)	1992-01-29
CA2046478A1 (fr)	1992-01-26
US5221368A (en)	1993-06-22
SG29795G (en)	1995-08-18
HK39195A (en)	1995-03-24
ES2050519T3 (es)	1994-05-16
JPH06120015A (ja)	1994-04-28
FR2665295B1 (fr)	1994-09-16
EP0468903B1 (de)	1994-02-09
FI913546L (fi)	1992-01-26
FR2665295A1 (fr)	1992-01-31
FI913546A0 (fi)	1991-07-24
IE66827B1 (en)	1996-02-07

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