WO2000029631A1 - Verfahren zur herstellung von weichmagnetischen sinterbauteilen - Google Patents
Verfahren zur herstellung von weichmagnetischen sinterbauteilen Download PDFInfo
- Publication number
- WO2000029631A1 WO2000029631A1 PCT/DE1999/003588 DE9903588W WO0029631A1 WO 2000029631 A1 WO2000029631 A1 WO 2000029631A1 DE 9903588 W DE9903588 W DE 9903588W WO 0029631 A1 WO0029631 A1 WO 0029631A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- binder
- green body
- mixture
- powder
- pressing
- 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.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
-
- 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
- H01F1/12—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 soft-magnetic materials
- H01F1/14—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 soft-magnetic materials metals or alloys
- H01F1/20—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/22—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
Definitions
- the invention relates to a method for producing soft magnetic sintered components according to the preamble of claim 1.
- soft magnetic components require a complex geometry depending on the application. Such components can be manufactured using powder metallurgy.
- the method according to the invention with the characterizing features of claim 1 offers the advantage that a considerably higher shape complexity of the soft-magnetic sintered components to be produced is achieved with less process complexity than is possible with the conventional axial pressing method. Another advantage is that the components with the high level of shape complexity do not require any further mechanical reworkability. In addition, those produced by the process according to the invention
- Components have better magnetic properties than components that are manufactured using conventional pressing processes.
- the process according to the invention also enables a lower proportion of fine powder compared to the metal powder injection molding process (MIM process), which makes the process more cost-effective.
- MIM process metal powder injection molding process
- thermoplastic properties of a temporary binder which is added to the starting powders are used in the process according to the invention.
- the flowability of the powder starting material is improved to such an extent that, while avoiding transverse flow cracks, material can be transported in the mold designed for the components transversely to the pressing direction.
- thermoplastic binder By adding a small amount of the thermoplastic binder, a high density is achieved in a powder pack.
- the properties of the starting powder mixture are influenced in such a way that it has the required viscosity behavior.
- the proportion of binder is chosen so that the applied pressure when the binder is heated and at least softened, the mixture of starting powder and binder can flow, but it is avoided that the weight of the green body, due to the binder content, exceeds its yield limit when heated to sintering temperature.
- a proportion of fine powder is added to the commercially available standard powder, which is used as the starting material. These starting powders are then mixed with the binder used.
- the binder can be a mixture of one
- Polymer and wax are mixed together with the mixture of the starting powder at a temperature at which the polymer has already softened and the wax has melted.
- the use of two different polymers with different viscosity behavior is also conceivable.
- the fine powder particles are bound by the binder to the coarser powder particles and the coarser particles of the powder are surrounded by a binder layer with fine powder particles.
- the powder treated in this way is easy to handle and free-flowing and is present as a composite powder.
- This composite powder can be preheated to a temperature at which the binder softens again and then introduced into the heatable tool, which contains the shape of the component to be produced.
- the added proportion of fine powders increases the sintering activity and consequently also the sintering density of the fully sintered soft magnetic sintered components.
- the increase in density is distributed over the shape during compression by pressing and through the shrinkage during sintering.
- the starting powder is only loosely packed in the conventional pressing method and the compression takes place mainly in the molding process during pressing.
- Metal powder injection molding process is the density increase achieved during sintering and the shaping proceeds almost without compression.
- FIG. 1 shows a process diagram for producing a soft magnetic sintered component
- FIG. 2 shows hysteresis loops of soft magnetic sintered components made of Fe ⁇ Cr, Fe 17 Co and Fe 48 Co 2 V powder
- Figure 3 shows the determined magnetization curve of a Fe ⁇ Cr sintered component and Figure 4 shows the determined magnetization curve of an Fe43C ⁇ 2V sintered component.
- starting component A 60 to 60 three starting components A, B and C are first used, as shown in FIG. As starting component A 60 to 60, three starting components A, B and C are first used, as shown in FIG. As starting component A 60 to 60, three starting components A, B and C are first used, as shown in FIG. As starting component A 60 to 60, three starting components A, B and C are first used, as shown in FIG. As starting component A 60 to
- Viscosity behavior of the individual polymers to be used In a first process stage 1, the starting components A, B and C are mixed in a heatable kneading mixer to form a homogeneous, flowable starting powder mixture. The mixture obtained is then pressed in a second process stage 2 using a conventional press with a pressure of 400 to 800 MPa and at a temperature of 60 to 100 ° C to a green body with the desired shape. At this temperature the binder is at least softened and that
- the green body obtained is subsequently subjected to high-temperature sintering in accordance with the further process stage 3
- the soft magnetic sintered component made of Fe ⁇ Cr, Fe 17 Co and Fe 4 gCO2V powder produced according to the described method have the magnetic properties listed in Tables 1 and 2 below and the hysteresis loops or magnetization curves shown in FIGS. 2, 3 and 4 .
- Table 1 The results in Table 1 were achieved with starting powders A and B in the upper grain size range.
- component A an initial powder with ad 50 of 100 ⁇ m was used as component B, an initial powder with ad 50 of 35 ⁇ m.
- the same starting components A and B were used in the results according to Table 2, although the medium to lower grain size range was used.
- a starting powder with ad 50 of 70 ⁇ m was used as component A and a starting powder with ad 50 of 10 ⁇ m was used as component B.
- these grain sizes a significant improvement in the space filling but also in the magnetic parameters of the soft magnetic sintered component produced was surprisingly found.
- FIG. 2 shows the hysteresis loops of the soft magnetic sintered components made of Fe ⁇ Cr, Fe ⁇ Co and Fe 4 gCO2V powder listed in Table 1.
- the Hysteresis curves show the magnetic induction B as a function of the magnetic field strength H.
- the course of the magnetization curves shows that all three materials have a low coercive field strength with a relatively high permeability.
- FIGS. 3 and 4 show the state variables of magnetic polarization J as a function of the magnetic field strength H using the magnetization curves for the soft magnetic sintered components made of Fe ⁇ Cr and Fe 4 gCO2V powder listed in Table 2.
- a remanence of 0.487 T and a saturation polarization or saturation induction of 1.439 T at a maximum field strength of 10.24 kA / m were measured for the Fe ⁇ Cr sintered component.
- the values of the Fe 3CO2V sintered component have a remanence of 1.072 T and a saturation polarization or saturation induction of 1.89 T at a maximum field strength of 10.31 kA / m.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Powder Metallurgy (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000582609A JP2002530522A (ja) | 1998-11-16 | 1999-11-11 | 軟磁性焼結部材の製造法 |
| DE59904489T DE59904489D1 (de) | 1998-11-16 | 1999-11-11 | Verfahren zur herstellung von weichmagnetischen sinterbauteilen |
| CZ20011699A CZ300322B6 (cs) | 1998-11-16 | 1999-11-11 | Zpusob výroby magneticky mekkých slinovaných soucástí |
| EP99960891A EP1133577B1 (de) | 1998-11-16 | 1999-11-11 | Verfahren zur herstellung von weichmagnetischen sinterbauteilen |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19852699 | 1998-11-16 | ||
| DE19852699.7 | 1998-11-16 | ||
| DE19951963.3 | 1999-10-28 | ||
| DE19951963A DE19951963A1 (de) | 1998-11-16 | 1999-10-28 | Verfahren zur Herstellung von weichmagnetischen Sinterbauteilen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000029631A1 true WO2000029631A1 (de) | 2000-05-25 |
Family
ID=26050175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE1999/003588 Ceased WO2000029631A1 (de) | 1998-11-16 | 1999-11-11 | Verfahren zur herstellung von weichmagnetischen sinterbauteilen |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1133577B1 (de) |
| JP (1) | JP2002530522A (de) |
| CN (1) | CN1123645C (de) |
| CZ (1) | CZ300322B6 (de) |
| ES (1) | ES2194538T3 (de) |
| WO (1) | WO2000029631A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4614908B2 (ja) * | 2005-05-11 | 2011-01-19 | 日立粉末冶金株式会社 | 冷陰極蛍光ランプ用電極 |
| JP6191774B2 (ja) * | 2015-02-09 | 2017-09-06 | Jfeスチール株式会社 | 軟磁性粉末用原料粉末および圧粉磁芯用軟磁性粉末 |
| JP7217856B2 (ja) * | 2017-10-31 | 2023-02-06 | 株式会社レゾナック | 焼結磁心の製造方法、圧粉体、及び焼結磁心 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3135661A1 (de) * | 1981-09-09 | 1983-03-17 | Sumitomo Special Metals Co., Ltd., Osaka | Gesinterte magnetische legierung des fe-cr-co-typs und verfahren zur herstellung von gegenstaenden mit einer solchen legierung |
| US5368630A (en) * | 1993-04-13 | 1994-11-29 | Hoeganaes Corporation | Metal powder compositions containing binding agents for elevated temperature compaction |
| US5443787A (en) * | 1993-07-13 | 1995-08-22 | Tdk Corporation | Method for preparing iron system soft magnetic sintered body |
| DE19745283A1 (de) * | 1997-10-15 | 1999-04-22 | Fraunhofer Ges Forschung | Verfahren zur Herstellung von Bauteilen aus Pulvern |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2655355B1 (fr) * | 1989-12-01 | 1993-06-18 | Aimants Ugimag Sa | Alliage pour aimant permanent type fe nd b, aimant permanent fritte et procede d'obtention. |
-
1999
- 1999-11-11 JP JP2000582609A patent/JP2002530522A/ja active Pending
- 1999-11-11 CN CN99813335.3A patent/CN1123645C/zh not_active Expired - Lifetime
- 1999-11-11 CZ CZ20011699A patent/CZ300322B6/cs not_active IP Right Cessation
- 1999-11-11 WO PCT/DE1999/003588 patent/WO2000029631A1/de not_active Ceased
- 1999-11-11 EP EP99960891A patent/EP1133577B1/de not_active Expired - Lifetime
- 1999-11-11 ES ES99960891T patent/ES2194538T3/es not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3135661A1 (de) * | 1981-09-09 | 1983-03-17 | Sumitomo Special Metals Co., Ltd., Osaka | Gesinterte magnetische legierung des fe-cr-co-typs und verfahren zur herstellung von gegenstaenden mit einer solchen legierung |
| US5368630A (en) * | 1993-04-13 | 1994-11-29 | Hoeganaes Corporation | Metal powder compositions containing binding agents for elevated temperature compaction |
| US5443787A (en) * | 1993-07-13 | 1995-08-22 | Tdk Corporation | Method for preparing iron system soft magnetic sintered body |
| DE19745283A1 (de) * | 1997-10-15 | 1999-04-22 | Fraunhofer Ges Forschung | Verfahren zur Herstellung von Bauteilen aus Pulvern |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002530522A (ja) | 2002-09-17 |
| CN1326517A (zh) | 2001-12-12 |
| CN1123645C (zh) | 2003-10-08 |
| CZ20011699A3 (cs) | 2002-10-16 |
| CZ300322B6 (cs) | 2009-04-22 |
| EP1133577B1 (de) | 2003-03-05 |
| ES2194538T3 (es) | 2003-11-16 |
| EP1133577A1 (de) | 2001-09-19 |
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