EP0540898A3 - Method for the manufacture of single-phase, incongrously melting intermetallic phases - Google Patents

Method for the manufacture of single-phase, incongrously melting intermetallic phases Download PDF

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Publication number
EP0540898A3
EP0540898A3 EP19920117288 EP92117288A EP0540898A3 EP 0540898 A3 EP0540898 A3 EP 0540898A3 EP 19920117288 EP19920117288 EP 19920117288 EP 92117288 A EP92117288 A EP 92117288A EP 0540898 A3 EP0540898 A3 EP 0540898A3
Authority
EP
European Patent Office
Prior art keywords
temperature
phase
melting
reaction
manufacture
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
EP19920117288
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German (de)
Other versions
EP0540898A2 (en
EP0540898B1 (en
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.)
LCM LESS COMMON METALS Ltd
Original Assignee
TH Goldschmidt AG
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
Priority claimed from DE19914134793 external-priority patent/DE4134793A1/en
Priority claimed from DE19924204173 external-priority patent/DE4204173A1/en
Application filed by TH Goldschmidt AG filed Critical TH Goldschmidt AG
Publication of EP0540898A2 publication Critical patent/EP0540898A2/en
Publication of EP0540898A3 publication Critical patent/EP0540898A3/en
Application granted granted Critical
Publication of EP0540898B1 publication Critical patent/EP0540898B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/04—Dry methods smelting of sulfides or formation of mattes by aluminium, other metals or silicon
    • 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
    • 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
    • H01F1/059—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and Va elements, e.g. Sm2Fe17N2

Abstract

Process for the manufacture of single-phase intermetallic phases incongruously melting within a temperature range from 900 to 2000 K and having a homogeneity range of </= 10 atom % at room temperature by co-reduction is characterised by the combination of the following process steps and features: a) adjustment of the exothermic heat of the calciothermic reduction by the oxide content of the reaction mixture which corresponds in its composition to the desired single-phase alloy, in such a way that the temperature condition Tm > TR >/= 0.9 Tm (in Kelvin) is met, Tm being the melting temperature of the intermetallic phase and TR being the reaction temperature, b) use of a reaction mixture whose components - except for calcium - have a mean particle size of </= 75 mu m, c) tempering of the reaction material after the exothermic reaction has taken place at a temperature which is at least 0.7 times the melting temperature Tm of the desired single-phase alloy, measured in K, but less than the melting temperature Tm, for a period sufficient for diffusion of the constituents. d
EP92117288A 1991-10-22 1992-10-09 Method for the manufacture of single-phase, incongrously melting intermetallic phases Expired - Lifetime EP0540898B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19914134793 DE4134793A1 (en) 1991-10-22 1991-10-22 Mfg. intermetallic phases with non-congruent m.pts. - by calcio:thermal redn. of homogeneous mixt. of alloy components with mean particle size up to 75 microns, followed by tempering
DE4134793 1991-10-22
DE4204173 1992-02-13
DE19924204173 DE4204173A1 (en) 1992-02-13 1992-02-13 Producing single phase incongruently melting intermetallic alloys

Publications (3)

Publication Number Publication Date
EP0540898A2 EP0540898A2 (en) 1993-05-12
EP0540898A3 true EP0540898A3 (en) 1993-05-26
EP0540898B1 EP0540898B1 (en) 1997-12-29

Family

ID=25908420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92117288A Expired - Lifetime EP0540898B1 (en) 1991-10-22 1992-10-09 Method for the manufacture of single-phase, incongrously melting intermetallic phases

Country Status (7)

Country Link
US (1) US5354354A (en)
EP (1) EP0540898B1 (en)
JP (1) JPH05214462A (en)
AT (1) ATE161449T1 (en)
CA (1) CA2081032A1 (en)
DE (1) DE59209088D1 (en)
FI (1) FI924766A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4237346C1 (en) * 1992-11-05 1993-12-02 Goldschmidt Ag Th Method for the production of rare earth alloys of the type SE¶2¶Fe¶1¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶
US7004993B2 (en) * 2003-06-13 2006-02-28 Philip Morris Usa Inc. Nanoscale particles of iron aluminide and iron aluminum carbide by the reduction of iron salts
US7666143B2 (en) * 2004-12-14 2010-02-23 Siemens Medical Solutions Usa, Inc. Array rotation for ultrasound catheters

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2039972A1 (en) * 1969-08-13 1971-02-25 Gen Electric Process for the production of intermetallic compounds with rare earths
DE2303697B1 (en) * 1973-01-26 1973-12-06 Th. Goldschmidt Ag, 4300 Essen PROCESS FOR MANUFACTURING ALLOY POWDERS FROM RARE EARTH AND COBALT
EP0039791A1 (en) * 1980-05-09 1981-11-18 Th. Goldschmidt AG Method of producing sinterable titanium base alloy powder
EP0144868A2 (en) * 1983-12-06 1985-06-19 Th. Goldschmidt AG Process for manufacturing fine metallic chromium powder with a low oxygen content
US4525206A (en) * 1983-12-20 1985-06-25 Exxon Research & Engineering Co. Reduction process for forming powdered alloys from mixed metal iron oxides
DE3621121A1 (en) * 1985-06-24 1987-01-02 Sumitomo Metal Mining Co METHOD FOR PRODUCING ALLOY POWDER CONTAINING RARE EARTH METALS
EP0299590A2 (en) * 1987-07-15 1989-01-18 Crucible Materials Corporation Method for producing dysprosium-iron-boron alloy powder
EP0364089A1 (en) * 1988-10-11 1990-04-18 General Motors Corporation Method of de-calcifying rare-earth metals formed by a reduction-diffusion process
US4990307A (en) * 1988-03-22 1991-02-05 Crucible Materials Corporation Method for producing particles for the production of permanent magnets

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918933A (en) * 1973-03-28 1975-11-11 Gen Electric Nickel-lanthanum alloy produced by a reduction-diffusion process
CA1316375C (en) * 1982-08-21 1993-04-20 Masato Sagawa Magnetic materials and permanent magnets
US4767450A (en) * 1984-11-27 1988-08-30 Sumitomo Special Metals Co., Ltd. Process for producing the rare earth alloy powders
JPS627831A (en) * 1985-07-04 1987-01-14 Sumitomo Special Metals Co Ltd Manufacture of permanent magnet material
JPS62188772A (en) * 1985-07-08 1987-08-18 Hitachi Metals Ltd Production of rare earth metal-iron-boron magnet
JPS62261101A (en) * 1986-05-07 1987-11-13 Hitachi Metals Ltd Manufacture of alloy powder for permanent magnet
EP0249973B1 (en) * 1986-06-16 1991-11-06 Tokin Corporation Permanent magnetic material and method for producing the same
EP0369097B1 (en) * 1988-11-14 1994-06-15 Asahi Kasei Kogyo Kabushiki Kaisha Magnetic materials containing rare earth element iron nitrogen and hydrogen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2039972A1 (en) * 1969-08-13 1971-02-25 Gen Electric Process for the production of intermetallic compounds with rare earths
DE2303697B1 (en) * 1973-01-26 1973-12-06 Th. Goldschmidt Ag, 4300 Essen PROCESS FOR MANUFACTURING ALLOY POWDERS FROM RARE EARTH AND COBALT
EP0039791A1 (en) * 1980-05-09 1981-11-18 Th. Goldschmidt AG Method of producing sinterable titanium base alloy powder
EP0144868A2 (en) * 1983-12-06 1985-06-19 Th. Goldschmidt AG Process for manufacturing fine metallic chromium powder with a low oxygen content
US4525206A (en) * 1983-12-20 1985-06-25 Exxon Research & Engineering Co. Reduction process for forming powdered alloys from mixed metal iron oxides
DE3621121A1 (en) * 1985-06-24 1987-01-02 Sumitomo Metal Mining Co METHOD FOR PRODUCING ALLOY POWDER CONTAINING RARE EARTH METALS
EP0299590A2 (en) * 1987-07-15 1989-01-18 Crucible Materials Corporation Method for producing dysprosium-iron-boron alloy powder
US4990307A (en) * 1988-03-22 1991-02-05 Crucible Materials Corporation Method for producing particles for the production of permanent magnets
EP0364089A1 (en) * 1988-10-11 1990-04-18 General Motors Corporation Method of de-calcifying rare-earth metals formed by a reduction-diffusion process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12, no. 135 (E-604)(2982) 23. April 1988 & JP-A-62 261 101 ( HITACHI METALS LTD ) 13. November 1987 *

Also Published As

Publication number Publication date
EP0540898A2 (en) 1993-05-12
CA2081032A1 (en) 1993-04-23
US5354354A (en) 1994-10-11
JPH05214462A (en) 1993-08-24
FI924766A (en) 1993-04-23
FI924766A0 (en) 1992-10-21
ATE161449T1 (en) 1998-01-15
DE59209088D1 (en) 1998-02-05
EP0540898B1 (en) 1997-12-29

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