• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    1443756 Permanent magnets GENERAL ELECTRIC CO 2 Nov 1973 [3 Nov 1972] 51058/73 Heading C3N [Also in Division H1] A permanent magnet is hot pressed from powder particles, in a mould or die of, e.g. stainless steel having the configuration and magnetic moment direction required; the particles being first coated with a binding polymer, e.g. polycarbonate, by agitation with a solution of the polymer to which an insoluble vehicle is added to produce precipitation on to the particles; which are separated and dried. The particles may be of ferrite, Al-Ni-Co alloy, or Co.R where R is a rare earth, e.g. Sm, Pr, Fe, Nd, mischmetal, or their combinations. The solvent for polycarbonate may be methylene chloride and the precipitation vehicle may be methanol, and a field of, e.g. 12000 gauss may be applied during pressing to align the particles under pressure of, e.g. 120,000 p.s.i. The particles may be coated, e.g. with Zn, under the polymer layer, and the latter may be polyphenylene oxide, polystyrene or polymethyl methacrylate dissolved in toluene, or poly-(1,4)- butanediol terephthalate, polyethylene terephthalate or hexamethylene adipamide in phenol, or acrylonitrile butadiene-styrene in chloroform. Higher alcohols may be used as precipitants.
    公开号:SU730284A3
    申请号:SU731970159
    申请日:1973-11-02
    公开日:1980-04-25
    发明作者:Дозер Манфред；Эдвин Флориан Дэниел
    申请人:Дженерал Электрик Компани (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the field of pusnikovskoy metallurgy, in particular to the production of permanent magnets from powders of cobalt alloys - a rare-earth element by hot pressing. A known method of obtaining sintered permanent magnets from a powder of a magnetic-hard material, which involves grinding the original powder, mixing it with a solution of an artificial resin, drying, compressing in a magnetic field and subsequent sintering 1. A disadvantage of the known method is that the protective film of resin is applied by adding an artificial resin solution to the dry powder, which, after drying with additional abrasion of conglomerates before pressing, causes a discontinuity of the protection film, causing the material to become contaminated with oxygen in the air. The closest to the proposed invention to the technical essence and the achieved result is the method which consists in preparing a solution of the polymer in an organic solvent, introducing into it the shock of a magnetic material with continuous stirring, the resulting suspension is dried to reduce the solvent and form on the surface the powder particles of the protective film of the polymer, the dried mixture is additionally triturated to destroy the conglomerates and subjected to hot pressing in an orienting magnetic field 2. However The known method also does not allow the high magnetic properties of the initial powder of the cobalt-rare-earth alloy to be preserved due to the discontinuity of the protective film of the polymer during its abrasion, which leads to the oxidation of the material during its further processing. The aim of the invention is to improve the quality of the sintered material from an alloy with a high chemical activity. To this end, a method is proposed for producing a sintered magnetic material, which differs from the known one in that a precipitant is added during the mixing process. Polycarbonate resin is used as a polymer as methylene chloride as an organic solvent, and methyl alcohol is used as a precipitant.
    The essence of the proposed method is as follows.
    The polymer is dissolved in an organic solvent, then, when grinding, powder of a magnetic material is added to it at a ratio of Isl, after which a solution of the precipitant is slowly introduced in an amount necessary to fully precipitate the polymer from solution.
    The coated powder is separated from the solution, dried in air, loaded into the mold, and pressed into an orienting magnetic field. The polymer coating may be applied to the pre-metallized powder.
    Example 1. 20 g of polycarbonate (lexane) is dissolved in 200 g of chlorinated methylene. With continuous stirring, 200 g of SmCOg powder with a particle size of 125400 microns are poured into a solution. Then methanol is added to the solution to precipitate polycarbonate onto porous particles. After sedimentation, the porcupine is separated from the solution, dried in air to remove the solvent, and poured into a mold.
    At a pressure of 8.44 t / cm, the particles are oriented in a magnetic field of 12000 Gs, and then they are pressed at a temperature of 250 ° C. As a result, a sintered material with a density of 58.3% with the same magnitude was obtained from the SmCof pig having the initial coercive force (He) 12200 Oe
    Example 2. A solution of polycarbonate in methylene chloride is prepared as in Example 1. SmCo5 powder is precoated with zinc (3 wt.%), And then with stirring, a film of polymer is deposited on it (7 wt.%). From the obtained powder, an article with a density of 58 is pressed. 3%, the coercive force of which is 12200 E.
    Example 3. A zinc coating (3 wt.%) Was applied to SraCo powder. The polymer coating was not applied. After hot pressing, the material has a density of 71.5% and a coercive force of 3600 Oe.
    Thus, the coating of particles is polymeric (allows eliminating the subsequent oxidation of the powder at all stages of its processing and preserving the magnetic properties of the material at the initial level. In addition, the polymer coating plays the role of lubricant during pressing and facilitates the orientation of the particles in a magnetic field. The rupture of the magnetic material obtained from particles coated with zinc (5 wt.%) and polymer (3 wt.%) is 59.2 kg / cm and 340.5 kg / cm, respectively.
    The proposed method can be applied using other polymer-solvent systems, in particular, acrylonitrile-butadiene-styrene can be used as a polymer, and chloroform can be used as a solvent. Toluene, poly-1, 4-butadiene-tetraftolate with phenol, and phenol with polyhexamethylene-achinazine can also be a solvent.
    权利要求:
    Claims (4)
    [1]
    1. A method of obtaining a sintered magnetic material, including preparing a polymer solution in an organic solvent, introducing magnetic powder into it with continuous stirring, drying and subsequent pressing in an orienting magnetic field, characterized in that, in order to improve the quality of the material, polymer precipitator.
    [2]
    2. A method according to claim 1, wherein a polymer is used (polycarbonate resin.
    [3]
    3. A method according to claim 1, characterized in that methylene chloride is used as an organic solvent.
    [4]
    4. A method according to claim 1 / characterized in that methyl alcohol is used as a precipitant.
    Sources of information taken into account in the examination
    1o Patent of Germany No. 1288317, cl. 40 in 1/04, published. 1969.
    2. Patent Syy No. 3424578, class, 72-213, published. 1969.
    类似技术:
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    同族专利:
    公开号 | 公开日
    IT998856B|1976-02-20|
    JPS49134517A|1974-12-25|
    US3933536A|1976-01-20|
    GB1443756A|1976-07-28|
    JPS5723405B2|1982-05-18|
    SE404974B|1978-11-06|
    DE2350585A1|1974-05-16|
    NL7314530A|1974-05-07|
    ES420183A1|1976-03-16|
    SE7705585L|1977-05-12|
    FR2205721B1|1979-05-04|
    FR2205721A1|1974-05-31|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/303,424|US3933536A|1972-11-03|1972-11-03|Method of making magnets by polymer-coating magnetic powder|
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