CN100408233C - Magnetic field jel injection molding forming method for large scale rare earth aeolotropic binding magnet - Google Patents
Magnetic field jel injection molding forming method for large scale rare earth aeolotropic binding magnet Download PDFInfo
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- CN100408233C CN100408233C CNB2006101125419A CN200610112541A CN100408233C CN 100408233 C CN100408233 C CN 100408233C CN B2006101125419 A CNB2006101125419 A CN B2006101125419A CN 200610112541 A CN200610112541 A CN 200610112541A CN 100408233 C CN100408233 C CN 100408233C
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Abstract
The invention discloses a magnetic gel casting moulding method of large-size rare earth anisotropy adhesion, which comprises the following steps: dissolving ethyl acrylate in the toluene to form 5-50vol.% pre-mixing liquid, adding disperser in the solution, blending with magnetic powder under vacuum operational box with Ar gas, balling the mixture for 2-24h, adding benzoyl peroxide as initiator and dimethylaniline as catalyst, soaking in the slurry chamber at indoor temperature for 5-30min, casting in the mould, heating to 40-80 deg.c, insulating for 30-150 min, stripping, drying in the vacuum for 12-72h, obtaining the each-anisotropy adhesion magnet of rare earth.
Description
Technical field
The invention belongs to the powder metallurgy forming technical field, a kind of magnetic field gel injection molding method of large scale rare earth aeolotropic binding magnet particularly is provided.
Background technology
In the pressing under magnetic field process, magnetic improvement of the degree of orientation in magnetic field is the key factor that improves the permanent magnet magnetic performance.At present, Nd-Fe-B is that compression moulding or injection molding technique are mainly adopted in rare earth aeolotropic binding magnet production.Compression moulding or the general viscosity of injection moulding binding agent that rare earth aeolotropic binding magnet adopts are higher, have increased difficulty for the magnetic powder particle magnetic field orientating.And injection molding technique need add more binding agent, and the used gained bonded permanent magnet magnetic property that makes is lower.
Gel casting forming (gelcasting) is invented in early 1990s by people such as U.S. Oak Ridge National Laboratory professors M.A.Janney, is a kind of complicated shape pottery or the metal parts near-net-shape method that receives much attention in recent years.Its moulding mechanism is that organic monomer and solvent are mixed with certain density premixed liquid, metal or ceramic powder suspension are in the concentrate suspension of wherein making low viscosity, high solid loading, add after initator and the catalyst, this concentrate suspension (slurry) is injected non-porous mould, under certain temperature condition, organic polymer is monomer crosslinked to aggregate into three-dimensional network shaped polymer gel, and makes powder particle original position bonding and solidify to form base substrate.Base substrate obtains product after drying.Its advantage is easy-formation large scale, complicated shape goods, and binder content is few, density is even, intensity is high.
Summary of the invention
The object of the present invention is to provide a kind of magnetic field gel injection molding method of large scale rare earth aeolotropic binding magnet, adopt magnetic field gel injection molding technology to realize the production of big the rare earth aeolotropic binding magnet of complicated shape of large scale, high magnetic characteristics.The present invention is applicable to that the Nd-Fe-B of rare-earth bond magnet is a bonded permanent magnet.
The present invention dissolves in toluene with hydroxy-ethyl acrylate to be mixed with certain density premixed liquid, after premixed liquid adds dispersant, in the vacuumizing case, mixes with rare-earth magnetic under the Ar atmosphere and stir and the injection ball grinder, obtain suspended nitride through ball milling, add initator and catalyst after the froth in vacuum, afterwards this concentrate suspension slurry is injected non-porous mould, under certain temperature condition and magnetic field intensity, organic polymer is monomer crosslinked to aggregate into three-dimensional network shaped polymer gel, and makes the back original position bonding of powder particle orientation and solidify to form base substrate.Base substrate obtains rare earth aeolotropic binding magnet after drying.Concrete technology is as follows:
A, hydroxy-ethyl acrylate is dissolved in toluene, makes the premixed liquid of 5～50vol.% (vol.% is a percent by volume) stable homogeneous;
B, in premixed liquid, add dispersant after, in the vacuumizing case, mix with magnetic under the Ar atmosphere; Wherein magnetic is 10～60vol.% of mixture; The dispersant that uses any as in polyacrylamide, polyacrylic acid, the polymethyl acid amide, dispersant dosage accounts for the 0.05～1.0wt% (wt% is a mass percent) of magnetic quality;
C, with b step gained compound ball milling 2～24 hours;
D, add initator benzoyl peroxide and catalyst dimethylaniline after, with c step gained slurry room temperature froth in vacuum 5～30 minutes; Initiator amount accounts for 0.005～0.5wt% of magnetic quality; Catalyst amount accounts for 0.001～0.01wt% of magnetic quality;
E, slurry is injected mould, heating mould to 40～80 ℃ afterwards, insulation demoulding after about 30～150 minutes in magnetic field, room temperature vacuum drying 12～72 hours obtains rare earth aeolotropic binding magnet.
Described mold materials is glass or metal, rubber, plastics etc.;
The present invention is applied to rare earth aeolotropic binding magnet moulding major advantage with the gel casting forming technology and is than other forming technique:
(1) viscosity is lower than 0.01Pas under the gel casting forming technology solvent for use normal temperature; During magnetic field orientating, magnetic powder particle compares to compression moulding or process of injection molding, and littler, the action of resistance is more prone to when outer magnetic field direction rotates, therefore identical outside after the match, the gel casting forming rare-earth bond magnet helps acquisition than high-orientation;
(2) the gel casting forming technology can utilize mold materials such as cheap, as to be convenient to obtain complicated shape paraffin, plastics clearly to show minutia, and forming process does not need main equipment, easy and simple to handle, can under the prerequisite of lower cost, satisfy the requirement of large scale, complicated shape simultaneously, solve this difficult problem;
(3) gel casting forming technology mould structure is simple, is convenient to the setting of all directions externally-applied magnetic field, and equipment cost is reduced.
The specific embodiment
Embodiment 1
The NdFeB powder is the quick-fried method of commercially available hydrogen (HDDR method) magnetic, particle mean size 73 μ m; It is pure that hydroxy-ethyl acrylate, solvent toluene, initator benzoyl peroxide, catalyst dimethylaniline, oleic acid are analysis.
The 30ml hydroxy-ethyl acrylate is dissolved in 70 milliliters of toluene, adds 760 gram NdFeB powder and 3 gram polyacrylic acid dispersant, ball milling adds initator and catalyst after 24 hours, froth in vacuum 15 minutes, the slurry of acquisition solid volume fraction 50%.With slurry injected plastic mould, in magnetic field, in 80 ℃ of following insulations 60 minutes, demoulding final vacuum can obtain magnetic field gel injection molding anisotropic bond NdFeB magnet in dry 12 hours with mould.
Claims (2)
1. the magnetic field gel injection molding method of a large scale rare earth aeolotropic binding magnet is characterized in that, technology is:
A, hydroxy-ethyl acrylate is dissolved in toluene, makes the premixed liquid of 5～50vol.% stable homogeneous;
B, in premixed liquid, add dispersant after, in the vacuumizing case, mix with magnetic under the Ar atmosphere; Wherein magnetic is 10～60vol.% of mixture; The dispersant that uses any as in polyacrylamide, polyacrylic acid, the polymethyl acid amide, dispersant dosage accounts for 0.05～1.0wt% of magnetic quality;
C, with b step gained compound ball milling 2～24 hours;
D, add initator benzoyl peroxide and catalyst dimethylaniline after, with c step gained slurry room temperature froth in vacuum 5～30 minutes; Initiator amount accounts for 0.005～0.5wt% of magnetic quality; Catalyst amount accounts for 0.001～0.01wt% of magnetic quality;
E, slurry is injected mould, heating mould to 40～80 ℃ afterwards, insulation demoulding after about 30～150 minutes in magnetic field, room temperature vacuum drying 12～72 hours obtains rare earth aeolotropic binding magnet;
Described magnetic is the NdFeB powder.
2. in accordance with the method for claim 1, it is characterized in that mold materials is glass or metal, rubber, plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101125419A CN100408233C (en) | 2006-08-23 | 2006-08-23 | Magnetic field jel injection molding forming method for large scale rare earth aeolotropic binding magnet |
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| CNB2006101125419A CN100408233C (en) | 2006-08-23 | 2006-08-23 | Magnetic field jel injection molding forming method for large scale rare earth aeolotropic binding magnet |
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| Publication Number | Publication Date |
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| CN1919504A CN1919504A (en) | 2007-02-28 |
| CN100408233C true CN100408233C (en) | 2008-08-06 |
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| CNB2006101125419A Active CN100408233C (en) | 2006-08-23 | 2006-08-23 | Magnetic field jel injection molding forming method for large scale rare earth aeolotropic binding magnet |
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| CN102039412B (en) * | 2011-01-20 | 2012-09-19 | 北京科技大学 | Method for carrying out gel centrifugal forming on metal parts |
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Assignee: Sanhuan permanent magnet (Beijing) science and Technology Co., Ltd. Assignor: University of Science and Technology Beijing Contract record no.: 2012990000203 Denomination of invention: Magnetic field jel injection molding forming method for large scale rare earth aeolotropic binding magnet Granted publication date: 20080806 License type: Exclusive License Open date: 20070228 Record date: 20120410 |