WO1991014273A1 - VERFAHREN ZUM HERSTELLEN EINES GESINTERTEN SEFe-PERMANENTMAGNETEN - Google Patents
VERFAHREN ZUM HERSTELLEN EINES GESINTERTEN SEFe-PERMANENTMAGNETEN Download PDFInfo
- Publication number
- WO1991014273A1 WO1991014273A1 PCT/DE1991/000176 DE9100176W WO9114273A1 WO 1991014273 A1 WO1991014273 A1 WO 1991014273A1 DE 9100176 W DE9100176 W DE 9100176W WO 9114273 A1 WO9114273 A1 WO 9114273A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- permanent magnet
- alloy
- proportion
- sintered
- sefe
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000011521 glass Substances 0.000 claims abstract description 25
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 20
- 238000005260 corrosion Methods 0.000 claims abstract description 12
- 230000007797 corrosion Effects 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 9
- 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 claims abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 5
- 229910052684 Cerium Inorganic materials 0.000 claims description 3
- 229910052810 boron oxide Inorganic materials 0.000 claims description 3
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 150000002910 rare earth metals Chemical class 0.000 claims description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 description 4
- 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 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- -1 rare earth compounds Chemical class 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0089—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with other, not previously mentioned inorganic compounds as the main non-metallic constituent, e.g. sulfides, glass
-
- 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
-
- 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 method for producing a sintered SEFe permanent magnet with a high proportion of a tetragonal magnetic phase of the SE 2 Fe 14 B and / or SE 2 Fe 14 C type and with high corrosion resistance.
- Such high-energy magnets are pressed and sintered, as shown in EP-PS 0 101 552.
- This excess leads to large proportions of SE-rich non-magnetic phases that accumulate around the magnetic phase.
- These SE-rich non-magnetic phases in conjunction with the magnetic SE 2 Fe 14 B and / or SE 2 Fe 14 C phases lead to a non-corrosion-resistant permanent magnet, since these phases assume different electrochemical potentials, are sensitive to corrosion and influence each other.
- This object is achieved according to the invention in that a proportion of 1.5 to 8 percent by volume of glass powder is added to the alloy on which the permanent magnet is based.
- the glass powder can be ground together with the starting melt for the alloy and can thus be easily introduced into the alloy.
- the sintering and magnetization process takes place in the usual way.
- the non-magnetic phase made of glass includes the corrosion-sensitive, magnetic SE 2 Fe 14 B and / or SE 2 Fe 14 C phases.
- the glass phase is absolutely corrosion-resistant, but worsens the magnetic one
- SEFe permanent magnet Properties of the SEFe permanent magnet are negligible. Since the components of the glass phase have a greater affinity for oxide formation than SE, excess SE can be released in metal form, which easily oxidize on the surface of the permanent magnet can, while it is embedded corrosion-resistant in the glass phase inside the permanent magnet. The tetragonal magnetic crystalline phase is also embedded in glass in a corrosion-resistant manner.
- the permanent magnet of this type also has an increased electrical specific resistance and is particularly suitable for use in motors, magnetic clutches or the like, in which less self-heating due to eddy current formation is important.
- the glass phase can be ensured in the manufacture of the permanent magnet by adding a proportion of 1.5 to 8 percent by volume of glass powder to the alloy.
- the glass powder can be ground together with the raw materials for the alloy. Since glass generally contains a proportion of boron or boron oxide, it can be provided that the glass powder contains a proportion of boron or boron oxide, which is taken into account in the production of the alloy.
- the formation of the glass phase can also be ensured by adding a proportion of 1.0 to 5% by volume of metallic cerium to the starting melt for the alloy, or by a proportion of 1.0 to 5% by volume to the starting melt for the alloy is added to metallic yttrium.
- a sintering temperature of about 900 to 1,100 ° C. is selected to form the permanent magnet. Since the components of the glass phase generally have a lower melting temperature, it is ensured that the sintering is used for the formation de Glass phase required chemical reactions take place.
- the melting temperature of the glass powder can also be influenced by the proportion of boron in the glass and adapted to the manufacturing process.
- Pressing, sintering and any post-heat treatment and magnetization are carried out in a known manner, it being possible for the pressure, the sintering temperature and the treatment tents to be varied.
- Nd and / or Pr with a sufficient oxygen content are preferably used as rare earth metals (SE).
- This oxygen is reduced by yttrium or cerium and forms a glass with other elements.
- Additional glass formers such as Bi 2 O 3 , SiO 2 , B 2 O 3 , CaO, Al 2 O 3 , K 2 O, Na 2 O, Y 2 O 3 , Ce 2 O 3 can also be added to the alloy.
- the alloy can also contain other components, such as Co, Al, Cy, Mo, Ga, C, O 2 .
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Power Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4007533.8 | 1990-03-09 | ||
| DE19904007533 DE4007533C1 (enrdf_load_stackoverflow) | 1990-03-09 | 1990-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1991014273A1 true WO1991014273A1 (de) | 1991-09-19 |
Family
ID=6401821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE1991/000176 WO1991014273A1 (de) | 1990-03-09 | 1991-02-28 | VERFAHREN ZUM HERSTELLEN EINES GESINTERTEN SEFe-PERMANENTMAGNETEN |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE4007533C1 (enrdf_load_stackoverflow) |
| WO (1) | WO1991014273A1 (enrdf_load_stackoverflow) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109003801B (zh) * | 2018-08-01 | 2020-11-10 | 江苏师范大学 | 一种高矫顽力钕铁硼烧结永磁体的制备方法 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE912842C (de) * | 1951-11-10 | 1954-06-03 | Siemens Ag | Aus Magnetpulver und Bindemittel bestehender Magnet, insbesondere Dauermagnet |
| EP0261579A1 (en) * | 1986-09-16 | 1988-03-30 | Tokin Corporation | A method for producing a rare earth metal-iron-boron permanent magnet by use of a rapidly-quenched alloy powder |
| WO1989012113A1 (en) * | 1988-06-03 | 1989-12-14 | Mitsubishi Metal Corporation | SINTERED RARE EARTH ELEMENT-B-Fe-MAGNET AND PROCESS FOR ITS PRODUCTION |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0248665B1 (en) * | 1986-06-06 | 1994-05-18 | Seiko Instruments Inc. | Rare earth-iron magnet and method of making same |
-
1990
- 1990-03-09 DE DE19904007533 patent/DE4007533C1/de not_active Expired - Fee Related
-
1991
- 1991-02-28 WO PCT/DE1991/000176 patent/WO1991014273A1/de unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE912842C (de) * | 1951-11-10 | 1954-06-03 | Siemens Ag | Aus Magnetpulver und Bindemittel bestehender Magnet, insbesondere Dauermagnet |
| EP0261579A1 (en) * | 1986-09-16 | 1988-03-30 | Tokin Corporation | A method for producing a rare earth metal-iron-boron permanent magnet by use of a rapidly-quenched alloy powder |
| WO1989012113A1 (en) * | 1988-06-03 | 1989-12-14 | Mitsubishi Metal Corporation | SINTERED RARE EARTH ELEMENT-B-Fe-MAGNET AND PROCESS FOR ITS PRODUCTION |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4007533C1 (enrdf_load_stackoverflow) | 1991-08-29 |
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