EP0334445A1 - Hartmagnetwerkstoff - Google Patents
Hartmagnetwerkstoff Download PDFInfo
- Publication number
- EP0334445A1 EP0334445A1 EP89200693A EP89200693A EP0334445A1 EP 0334445 A1 EP0334445 A1 EP 0334445A1 EP 89200693 A EP89200693 A EP 89200693A EP 89200693 A EP89200693 A EP 89200693A EP 0334445 A1 EP0334445 A1 EP 0334445A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hard magnetic
- magnetic material
- materials
- iron
- formula
- 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.)
- Withdrawn
Links
- 239000000696 magnetic material Substances 0.000 title claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 3
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 3
- 229910052777 Praseodymium Inorganic materials 0.000 claims abstract description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 6
- 150000002910 rare earth metals Chemical class 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 claims description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 description 8
- 238000000137 annealing Methods 0.000 description 5
- 238000001953 recrystallisation Methods 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 description 3
- 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 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 150000001639 boron compounds Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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
-
- 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
- H01F1/058—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IVa elements, e.g. Gd2Fe14C
Definitions
- the invention relates to a hard magnetic material comprising a rare earth metal, iron and carbon.
- the invention also relates to a magnet on the basis of hard magnetic material.
- a hard magnetic material of the type described in the opening paragraph is known from, inter alia , J. Appl. Phys. 61 3574-3576 (1987).
- the authors of the article classify the compound Nd2Fe14C described therein as not stable. Consequently, this material cannot be used as a starting material for a permanent magnet.
- a hard magnetic material which is further characterized in that the material contains a hard magnetic phase the composition of which corresponds to the formula RE2Fe 14-x Mn x C, wherein RE is at least one element selected from the group formed by Nd (Neodymium), Pr (Praseodymium), Ce (Cerium) and La (Lanthanum), and wherein 0.2 ⁇ x ⁇ 2. It has been found that the value of x cannto be selected randomly. The materials in which x is smaller than 0.2 were found to be insufficiently stable.
- the Curie temperature of the materials in which x is larger than 2 is about room temperature or below room temperature, which is problematic for the magnetic application of these materials.
- the Curie temperature can be raised by substituting a part of the iron present in the material with cobalt.
- the absence of B in the compounds according to the invention is an advantage because as a consequence thereof no toxic, volatile boroncompounds can be formed during the preparations of said compounds.
- the hard magnetic phase of the compounds according to the invention has a tetragonal crystal structure of the ThMn12 type, which is also the case with the known Nd2Fe14B.
- the Curie temperature (T c ) of the compounds according to the invention is between 300 and 550 K.
- the Curie temperature of compounds according to the invention having an identical rare earth metal is lower as the Mn content is higher.
- the hard magnetic materials according to the invention can be obtained in a customary way by melting together suitable starting materials in ratios corresponding to the compositional formula, after which they are subjected to an annealing treatment in a temperature range from 800° C - 950° C in a protective gas or a vacuum for two days; during which treatment recrystallization occurs.
- this stable material can also be prepared by melt spinning a composition with formula Nd2Fe14C, followed by an annealing treatment of the ribbon formed, during which treatment recrystallization occurs.
- Both known methods have the disadvantage that they are less suitable from an economical point of view.
- the hard magnetic properties of the compounds in accordance with the invention are comparable with those of materials on the basis of Nd2Fe14B.
- the magnetization measured at Nd2Fe 13.7 Mn 0.3 C powder at room temperature is approximately 100 Am2/kg.
- This value is comparable with the saturation magnetization which is measured at Nd2Fe14B powder at room temperature. It is noted that this value cannot be regarded as the saturation magnetization, since the material under consideration is magnetically very anisotropic.
- magnets in the form of shaped bodies can be manufactured from said materials in the usual manner.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8800739 | 1988-03-24 | ||
| NL8800739A NL8800739A (nl) | 1988-03-24 | 1988-03-24 | Hardmagnetisch materiaal. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0334445A1 true EP0334445A1 (de) | 1989-09-27 |
Family
ID=19851992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89200693A Withdrawn EP0334445A1 (de) | 1988-03-24 | 1989-03-20 | Hartmagnetwerkstoff |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0334445A1 (de) |
| JP (1) | JPH028345A (de) |
| KR (1) | KR890015303A (de) |
| CN (1) | CN1036101A (de) |
| NL (1) | NL8800739A (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5478411A (en) * | 1990-12-21 | 1995-12-26 | Provost, Fellows And Scholars Of The College Of The Holy And Undivided Trinity Of Queen Elizabeth Near Dublin | Magnetic materials and processes for their production |
-
1988
- 1988-03-24 NL NL8800739A patent/NL8800739A/nl not_active Application Discontinuation
-
1989
- 1989-03-20 CN CN89101680A patent/CN1036101A/zh active Pending
- 1989-03-20 EP EP89200693A patent/EP0334445A1/de not_active Withdrawn
- 1989-03-21 KR KR1019890003486A patent/KR890015303A/ko not_active Withdrawn
- 1989-03-22 JP JP1067766A patent/JPH028345A/ja active Pending
Non-Patent Citations (3)
| Title |
|---|
| JOURNAL OF APPLIED PHYSICS, vol. 52, no. 3, part II, March 1981, pages 2049-2051, American Institute of Physics, New York, US; K. HARDMAN et al.: "Magnetic structures of Y6(Fe1-xMnx)23 compounds" * |
| JOURNAL OF APPLIED PHYSICS, vol. 61, no. 8, 15th April 1987, pages 3574-3576, American Institute of Physics; N.C. LIU et al.: "High intrinsic coercivities in iron-rare earth-carbon-boron alloys through the carbide or boro-carbide Fe14R2X(X=BxC1-x)" * |
| MATERIALS LETTERS, vol. 4, nos. 8,9, August 1986, pages 377-380, Elsevier Science Publishers B.V., Amsterdam, NL; N.C. LIU et al.: "High coercivity permanent magnet materials based on iron-rare-earth-carbon alloys" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5478411A (en) * | 1990-12-21 | 1995-12-26 | Provost, Fellows And Scholars Of The College Of The Holy And Undivided Trinity Of Queen Elizabeth Near Dublin | Magnetic materials and processes for their production |
Also Published As
| Publication number | Publication date |
|---|---|
| KR890015303A (ko) | 1989-10-28 |
| NL8800739A (nl) | 1989-10-16 |
| CN1036101A (zh) | 1989-10-04 |
| JPH028345A (ja) | 1990-01-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT CH DE FR GB IT LI NL |
|
| 17P | Request for examination filed |
Effective date: 19900322 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19910726 |
|
| R18W | Application withdrawn (corrected) |
Effective date: 19910726 |