EP0304113A1 - Starting material for permanent magnets - Google Patents
Starting material for permanent magnets Download PDFInfo
- Publication number
- EP0304113A1 EP0304113A1 EP88201675A EP88201675A EP0304113A1 EP 0304113 A1 EP0304113 A1 EP 0304113A1 EP 88201675 A EP88201675 A EP 88201675A EP 88201675 A EP88201675 A EP 88201675A EP 0304113 A1 EP0304113 A1 EP 0304113A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- starting material
- permanent magnets
- fe14c
- hard
- temperature
- 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- Withdrawn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
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
-
- 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 which comprises neodymium and iron.
- Nd2 Fe14 B having a tetragonal crystal structure. It is known that a substitution of B by C in this compound leads to a greater anisotropy (see, for example, Journal de Physique Colloque C6, supplpir au no. 9, T. 46, September, 1985, pages C6-305/308: "Magnetic anisotropy of Carbon Doped Nd2Fe14B" by Bolzoni, Leccabue, Pareti and Sanchez). It is stated in this article on page 306 that it was not possible to obtain the tetragonal phase when borium was replaced entirely by carbon.
- the Curie-temperature is between 500 and 600 K.
- the hard-magnetic materials according to the invention can be obtained in the conventional manner by fusing starting materials suitable for that purpose succeeded by an annealing treatment in a protective gas or another vacuum. A number of materials which were obtained in this manner are collected in the following table which also states the Curie-temperature and the annealing temperature.
- the magnetic properties are comparable to those of materials on the basis of Nd2Fe14B or better.
- the absence of boron is an advantage since now poisonous volatile boron compounds cannot be formed in the preparation.
- Magnets in the form of shaped bodies can be sintered from the resulting material after pulverisation in the manner conventional with Nd2Fe14B.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Hard-magnetic materials having a high crystal anisotropy on a carbide basis of the general formula (RE1-xNdx) Fe₁₄C, wherein
RE is a rare earth metal having an atomic number exceeding 61 and 0.50 ≦ x ≦ 0.80 have a comparatively high Curie-temperature.
RE is a rare earth metal having an atomic number exceeding 61 and 0.50 ≦ x ≦ 0.80 have a comparatively high Curie-temperature.
Description
- The invention relates to a hard-magnetic material which comprises neodymium and iron.
- A known material of this type is the Nd₂ Fe₁₄ B having a tetragonal crystal structure. It is known that a substitution of B by C in this compound leads to a greater anisotropy (see, for example, Journal de Physique Colloque C6, supplément au no. 9, T. 46, September, 1985, pages C6-305/308: "Magnetic anisotropy of Carbon Doped Nd₂Fe₁₄B" by Bolzoni, Leccabue, Pareti and Sanchez). It is stated in this article on page 306 that it was not possible to obtain the tetragonal phase when borium was replaced entirely by carbon.
- It is the object of the invention to provide a hard-magnetic material having a great crystal anisotropy which comprises only carbon instead of boron and also a comparatively high content of neodymium.
- It has been found that this object can be achieved by means of a substance of the following composition:
(RE1-xNdx) Fe₁₄C,
wherein RE is one or more rare earth metals having an atomic number exceeding 61 (for example Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Lu) and
0.5 ≦ x ≦ 0.80. - It has been found that the magnetic properties decrease substantially if x < 0.5 or if x > 0.8.
- In all the combinations a carbide having a tetragonal crystal structure is found. The Curie-temperature is between 500 and 600 K. The hard-magnetic materials according to the invention can be obtained in the conventional manner by fusing starting materials suitable for that purpose succeeded by an annealing treatment in a protective gas or another vacuum. A number of materials which were obtained in this manner are collected in the following table which also states the Curie-temperature and the annealing temperature.
Table Compound Curie-temperature (K) Annealing temperature (°C) TbNdFe₁₄C 560 850 Tb0.5Nd1.5Fe₁₄C 550 800 Dy0.5Nd1.5Fe₁₄C 545 850 LuNdFe₁₄C 530 850 - The magnetic properties are comparable to those of materials on the basis of Nd₂Fe₁₄B or better. The absence of boron is an advantage since now poisonous volatile boron compounds cannot be formed in the preparation.
- Magnets in the form of shaped bodies can be sintered from the resulting material after pulverisation in the manner conventional with Nd₂Fe₁₄B.
Claims (2)
1. A hard-magnetic material which comprises neodymium and iron, characterized in that the material has the composition (RE1-xNdx) Fe₁₄C, wherein RE is Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and/or Lu and
0.5 ≦ x ≦ 0.8.
0.5 ≦ x ≦ 0.8.
2. A permanent magnet on the basis of a material as claimed in Claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8701970 | 1987-08-21 | ||
| NL8701970 | 1987-08-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0304113A1 true EP0304113A1 (en) | 1989-02-22 |
Family
ID=19850485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88201675A Withdrawn EP0304113A1 (en) | 1987-08-21 | 1988-08-03 | Starting material for permanent magnets |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0304113A1 (en) |
| JP (1) | JPS6473051A (en) |
| KR (1) | KR890004353A (en) |
| CN (1) | CN1031443A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109881113B (en) * | 2019-02-24 | 2020-05-19 | 东阳市宏丰磁业有限公司 | Composite permanent magnetic material and preparation method thereof |
-
1988
- 1988-08-03 EP EP88201675A patent/EP0304113A1/en not_active Withdrawn
- 1988-08-15 JP JP63203050A patent/JPS6473051A/en active Pending
- 1988-08-18 KR KR1019880010482A patent/KR890004353A/en not_active Application Discontinuation
- 1988-08-18 CN CN88106165A patent/CN1031443A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| JOURNAL OF APPLIED PHYSICS, Band 61, Nr. 8, 15. April 1987, Seiten 3574-3576, American Institute of Physics, New York, US; 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, Band 4, Nrs. 8,9, August 1986, Seiten 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" * |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6473051A (en) | 1989-03-17 |
| KR890004353A (en) | 1989-04-21 |
| CN1031443A (en) | 1989-03-01 |
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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 SE |
|
| 17P | Request for examination filed |
Effective date: 19890811 |
|
| 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 |