WO1999054890A1 - Aimant permanent resistant a la corrosion et son procede de fabrication - Google Patents
Aimant permanent resistant a la corrosion et son procede de fabrication Download PDFInfo
- Publication number
- WO1999054890A1 WO1999054890A1 PCT/JP1999/001945 JP9901945W WO9954890A1 WO 1999054890 A1 WO1999054890 A1 WO 1999054890A1 JP 9901945 W JP9901945 W JP 9901945W WO 9954890 A1 WO9954890 A1 WO 9954890A1
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- WO
- WIPO (PCT)
- Prior art keywords
- film
- permanent magnet
- corrosion
- magnet
- aluminum oxide
- Prior art date
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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
- 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
-
- 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
- H01F41/0253—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 for manufacturing permanent magnets
- H01F41/026—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 for manufacturing permanent magnets protecting methods against environmental influences, e.g. oxygen, by surface treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12014—All metal or with adjacent metals having metal particles
- Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
- Y10T428/12049—Nonmetal component
- Y10T428/12056—Entirely inorganic
Definitions
- the present invention relates to a corrosion-resistant permanent magnet and a method for manufacturing the same.
- the present invention relates to a Fe-BR-based permanent magnet provided with a corrosion-resistant coating having high magnetic properties and excellent adhesion, and having excellent corrosion resistance, acid resistance, alkali resistance, abrasion resistance, and electrical insulation.
- An aluminum oxide coating layer with a specific thickness is provided on the magnet surface via an A1 or Ti coating, and corrosion resistance, especially from initial magnetic properties when left in an atmosphere of 80 ° C and 90% relative humidity for a long time, is small,
- the present invention relates to a corrosion-resistant permanent magnet for obtaining an Fe-BR-based permanent magnet having extremely stable magnetic properties and a method for producing the same. Background art
- the Curie point of the magnet alloy is generally 300 ° C to 370 ° C.
- a Fe-BR-based permanent magnet having a higher point of curry (Tokukaisho 59-64733) No. JP-A-59-132104).
- the Co-containing Fe-BR based rare earth permanent magnet has a Curie point equal to or higher than that of the Co-containing Fe-BR based rare earth permanent magnet and has a higher (BH) ma, and its temperature characteristics, especially iHc, are improved. 25MGOe or more by including at least one of Dy, Tb, and other heavy rare earths in a part of R of Co-containing Fe-BR based rare earth permanent magnets, mainly Nd and Pr, etc.
- BH high
- the permanent magnet made of the Fe-BR based magnetic anisotropic sintered body having the excellent magnetic properties described above has a unique composition and structure composed of a rare earth element and iron, which are easily oxidized in air.
- the oxides generated on the surface of the magnet cause a decrease in the output of the magnetic circuit and variations between the magnetic circuits, and the problem of contamination of peripheral devices due to the loss of surface oxide. was there. Therefore, in order to improve the corrosion resistance of the above-mentioned Fe-BR permanent magnet, a permanent magnet whose surface is coated with a corrosion-resistant metal plating layer by electroless plating or electrolytic plating (Japanese Patent Publication No. 3-74012) Has been proposed.
- the permanent magnet body is a sintered body and is porous, an acidic solution or an alkaline solution from the plating pretreatment remains in the pores and may corrode with aging.
- the chemical resistance of the magnet body is poor, the surface of the magnet is corroded at the time of plating, and there is a problem that adhesion and corrosion resistance are poor.
- the purpose of this invention is to improve the abrasion resistance and corrosion resistance with excellent adhesion to the Fe-BR permanent magnet base, and to leave it for a long time, especially at 80 ° C and 90% relative humidity.
- An object of the present invention is to provide a Fe-BR-based permanent magnet having stable high magnet properties, wear resistance, electrical insulation, and corrosion resistance while minimizing deterioration from the initial magnetic properties in the event of the occurrence, and a method for producing the same.
- the inventors have found that excellent corrosion resistance, especially when left for a long time under an atmosphere condition of a temperature of 80 ° C and a relative humidity of 90%, has excellent adhesion to the substrate, and the corrosion resistance and corrosion resistance of the deposited metal coating.
- Various methods for forming an aluminum oxide coating on the surface of a permanent magnet body were studied for the purpose of Fe-BR permanent magnets with stable magnetic properties due to wear and electrical insulation.
- the inventors have found that the magnet body surface is cleaned by ion sputtering or the like, and then the A or Ti coating is formed on the magnet body surface by a vapor deposition method such as an ion plating method or an ion sputtering method. after forming the required film thickness, by forming a desired film thickness of the aluminum oxide film by a film forming method-phase gas while introducing 0 2 -containing gas of a particular condition it was found that the object can be achieved.
- a vapor deposition method such as an ion plating method or an ion sputtering method.
- the inventors believe that the oxides present on the magnet surface are partially or mostly reduced by the reaction with A1 or Ti at the interface with the A or Ti coating. Also, by forming an aluminum oxide film on the A1 or Ti film, 3 ⁇ 4 ⁇ 1 ⁇ 0 (0 ⁇ ⁇ 1) is generated at the interface between A1 and the aluminum oxide, and in the case of Ti, the aluminum oxide film Completion of the present invention by finding that a composite of (Ti-Al) O x (0 ⁇ x ⁇ l) is formed at the interface and the adhesion between the A1 or Ti coating and the aluminum oxide coating can be significantly improved did.
- a film thickness of 0.06 ⁇ ! After more formed A1 or Ti coating film-phase gas-film method ⁇ 30 ⁇ , 0 2 alone or 0 Ar containing 2 gas 10% or more, in a rare gas atmosphere such as He
- the present invention provides a corrosion-resistant permanent magnet characterized in that an amorphous aluminum oxide film layer having a film thickness of 0.1 to 10 ⁇ is formed by a vapor phase film forming method.
- a so-called gas phase method such as an ion plating method, an ion sputtering method, and a vapor deposition method is used.
- a film forming method can be used as appropriate, an ion plating method and a reactive ion plating method are preferable from the viewpoints of film density, uniformity, and film forming speed.
- the temperature of the permanent magnet serving as the substrate during the formation of the reaction film is preferably set to 200 ° C to 500 ° C. If the temperature is lower than 200 ° C, the reaction adhesion to the substrate magnet is not sufficient, and If it exceeds, the temperature difference from normal temperature (25 ° C) becomes large, and the film is cracked in the cooling process after processing, and peeling occurs partially from the substrate.
- the temperature should be set to 200 ° C to 500 ° C.
- the obtained aluminum oxide coating layer is a compound composed of aluminum and oxygen, and its structure is mainly composed of amorphous, and depending on the reaction conditions, only amorphous or partially amorphous The presence of crystalline material can be obtained. Structure for the amorphous and principal there are no clear grain boundary because hardly occurs local cell reaction resulting in corrosion, compared to the A1 2 0 3 coating crystalline, there are cormorants characterized not the corrosion resistance is excellent.
- An example of the method for producing a corrosion-resistant permanent magnet according to the present invention which is characterized in that an aluminum oxide coating layer is provided on the surface of an Fe-BR permanent magnet body via an A1 or Ti coating layer, will be described in detail below. .
- the vacuum vessel was evacuated to lXl (HPa or less) using an arc ion plating device, and the surface of the Fe-BR magnet was cleaned with a surface sputter using Ar ions at an Ar gas pressure of 10 Pa and -500 V. I do.
- the target A1 or Ti is evaporated with an Ar gas pressure of 0.2 Pa and a bias voltage of -50 V, and the target is evaporated on the surface of the magnet body by arc ion plating.
- a layer having a thickness of 0.06 ⁇ to 30 ⁇ forms a Ti coating layer.
- the ion plating method has a high film-forming speed, and is preferable for forming a film of A or Ti over 5 ⁇ .
- the thickness of the A1 or Ti coating on the surface of the Fe-B-R permanent magnet body is adjusted.
- A1 or Ti is difficult to be uniformly deposited on the surface of the magnet body and the effect as a base film is not sufficient, and if it exceeds 30 ⁇ , there is no problem.
- the film thickness of A1 or Ti is set to be 0.06 to 30 ⁇ because it is not practical because it increases the cost as a base film.
- the A1 or Ti coating thickness is selected according to the surface roughness of the magnet body.
- the coating thickness is preferably 0.06 ⁇ or more, and the surface roughness is
- the coating thickness is preferably ⁇ . ⁇ or more.
- the reason why the thickness of the aluminum oxide coating is limited to 0.1 to 10 ⁇ is that, when the thickness is less than ⁇ . ⁇ , sufficient corrosion resistance cannot be obtained, and when the thickness exceeds ⁇ , there is no problem, but the production cost is increased. It is not preferable.
- the interface between the A1 or Ti film and the aluminum oxide film is a laminated film in which a reaction film layer is interposed, and in order to obtain sufficient corrosion resistance, the A1 or Ti film is thickened to, for example, 5 ⁇ to 30 ⁇ , Reduce the thickness of the aluminum oxide coating or the thickness of the Al or Ti coating layer to about 0.06 ⁇ ⁇ 5 ⁇ .
- 0 2 containing gas atmosphere vapor deposition is limited to 0 2 alone or 0 2 gas a rare gas containing 10% or more (0 group elements of the periodic table), which is 10% in Aruminiumu oxide film generated der not preferable since it takes time to re, industrially Ar gas atmosphere typically a preferred including 02 gas alone or 0 2 gas is arbitrarily less than.
- the rare earth element R used in the permanent magnet occupies 10 to 30 atomic% of the composition, but at least one of Nd, Pr, Dy, Ho, and Tb, or La, Ce, Those containing at least one of Sm, Gd, Er, Eu, Tm, Yb, Lu, and Y are preferable.
- a power sufficient for one kind of R can be used in practical use.
- a mixture of two or more kinds can be used for reasons such as manual labor.
- this R may not be a pure rare earth element, and may contain impurities that are unavoidable in production as far as it is industrially available.
- R is an essential element in the above-mentioned permanent magnets. If it is less than 10 atomic%, the crystal structure becomes the same cubic structure as ⁇ -iron, so that high magnetic properties, especially high coercive force, cannot be obtained. If it exceeds atomic%, the amount of R-rich non-magnetic phase increases and the residual magnetic flux density (Br) decreases, so that a permanent magnet core with excellent characteristics cannot be obtained. So the R10 atom
- the range of% to 30 atomic% is desirable.
- B is an indispensable element in the above permanent magnets.
- the number of atoms is less than 2 atoms, the rhombohedral structure becomes the main phase, and a high coercive force (iHc) cannot be obtained. Since there are many phases, the residual magnetic flux density (Br) decreases, and a superior permanent magnet cannot be obtained. Therefore, B is desirably in the range of 2 to 28 atomic%.
- Fe is an essential element in the above permanent magnets. If it is less than 65 atomic%, the residual magnetic flux density (Br) decreases, and if it exceeds 80 atomic%, a high coercive force cannot be obtained. It is desirable that the content be in the range of atomic% to 80 atomic%. Also, substituting part of Fe with Co can improve the temperature characteristics without impairing the magnetic properties of the obtained magnet, but when the amount of Co exceeds 20% of Fe, conversely It is not preferable because the magnetic properties deteriorate. When the substitution amount of Co is 5 atomic% to 15 atomic% in the total amount of Fe and Co, it is preferable to obtain a high magnetic flux density because Br increases as compared with the case where no substitution is made.
- a part of B may contain less than 4.0 wt% of C, less than 2.0 wt% of P, and less than 2.0 wt% of P.
- S at least one of Cu less than 2.0 ⁇ %, replace with less than 2.0wt% in total: and can improve permanent magnet manufacturability and lower cost.
- At least one of Al, Ti, V, Cr, Mn, Bi, Nb, Ta, Mo, W, Sb, Ge, Sn, Zr, Ni, Si, Zn, and Hf is a Fe-BR permanent It can be added to the magnet material because it has the effect of improving the coercive force and the squareness of the demagnetization curve or improving the manufacturability and reducing the price.
- the upper limit of the amount of addition is preferably in a range that satisfies the above condition, since Br needs to be at least 9 kG or more in order to make (BH) max of the magnetic material 20 MGOe or more.
- the Fe-BR permanent magnet has a main phase of a compound having a tetragonal crystal structure having an average crystal grain size in a range of 1 to 30 ⁇ , and a nonmagnetic phase (oxide) having a volume ratio of 1% to 50%. Phase).
- Fe-B-R permanent magnets have coercive force
- (BH) max indicates (BH) max ⁇ 10MGOe, and the maximum value reaches 25MGOe or more.
- a well-known structure ingot was pulverized, finely pulverized, molded, sintered, heat-treated and subjected to surface treatment to obtain a magnet test piece having a composition of 17Nd-lPr-75Fe-7B and a size of 23 ⁇ 10 ⁇ 6 mm.
- Table 1 shows the magnet properties.
- two types of surface roughness products were obtained by surface polishing.
- Table 2 shows the surface roughness.
- the inside of the vacuum vessel was evacuated to lX liHPa or less, and the surface of the magnet body was cleaned by Ar gas pressure of 10 Pa, -400 V for 35 minutes to clean the surface of the magnet body.
- the temperature was kept at ° C, and the metal A1 was used as a target to form 0.2 ⁇ and 2.0 ⁇ A1 coating layers on the surface of the magnet body by an arc plating method.
- a magnet body test piece having the same composition as in Example 1 was obtained by polishing the surface under the same conditions as in Example 1 to obtain two types of surface roughness products, and after cleaning the surface under the same conditions as in Example 1, Under the conditions shown in Table 2, the temperature of the substrate magnet was kept at 250 ° C, and a Ti coating layer of 0.2 ⁇ and 2.0 ⁇ was formed on the magnet body surface by arc ion plating using metal Ti as a target.
- Example 3 An aluminum oxide coating layer was formed at 5 ⁇ under the same conditions as in Example 1, and the magnetic properties and deterioration after the test were left for 1000 hours at a temperature of 80 ° C and a relative humidity of 90%. , The results are shown in Table 3. The structure of the obtained aluminum oxide film was analyzed by an X-ray diffraction method, and as a result, an amorphous partly crystalline one was present.
- Example 3 A magnet test piece (surface roughness 0.5 ⁇ ) having the same composition as in Example 1 was cleaned under the same conditions as in Example 1, and then an A1 wire was heated as a coating material using Ar gas pressure lPa, voltage 1.5 kV. An A1 coating layer of 15 m was formed in 15 minutes by the ion plating method of evaporating and ionizing.
- the substrate magnet temperature 320 ° C, Roh W ⁇ scan voltage - 85 V, 0 to form an aluminum oxide coating layer having a thickness 0.5 ⁇ the A1 coating surface at 20 minutes at 2 gas 0.7Pa at Akui ion plating.
- the aluminum oxide film was amorphous.
- Example 1 After cleaning the surface of a magnet body test piece (surface roughness 0.5 ⁇ ) of the same composition as in Example 1 under the same conditions as in Example 1, aluminum oxide was placed on the magnet body under the same reaction conditions as in Example 1. A coating layer was formed at 7 ⁇ . After that, it was left for 1000 hours under the same conditions as in Example 1 at the same temperature of 80 ° C and relative humidity of 90%, and the magnetic properties after the test and its deterioration were measured.
- Example 3 After cleaning the surface of the magnet body test piece (surface roughness 0.5 ⁇ ) of the same composition as in Example 1 under the same conditions as in Example 3, it was placed on the magnet body under the same reaction conditions as in Example 3 for 17 minutes in 17 minutes. After the A1 coating layer was formed, it was left for 1000 hours under the same conditions of Example 1 at 80 ° C and 90% relative humidity, and the magnetic properties and deterioration after the test were measured. See Figure 3.
- the comparative magnet in which only the aluminum oxide coating layer was provided on the surface of the Fe-BR permanent magnet body having the same magnet characteristics was used at a temperature of 80 ° C and a relative humidity of 90%.
- the magnetic properties of the magnets before and after the corrosion test, which was left standing for 1000 hours, were significant and occurred, whereas the aluminum oxide coating layer was provided via the A1 or Ti coating layer. It is clear that ⁇ does not occur and that the magnet properties are almost unchanged.
- the Fe-BR permanent magnet according to the present invention has an aluminum oxide film layer provided on the magnet surface via an A1 or Ti film, and as shown in the examples, severe corrosion resistance test conditions, particularly at a temperature of 8 (TC, After being left for 1000 hours under the condition of 90% relative humidity, the magnet characteristics are hardly degraded, making it ideal as a high performance and inexpensive permanent magnet that is currently most required.
- the surface of the Fe-BR-based permanent magnet body is re-cleaned by an ion sputtering method or the like, the surface of the magnet body is subjected to a gas-phase film forming method such as an ion plating method.
- the coating after the formation of the Ti coating film, 0 2 containing a rare gas introducing characterized that you form I O amp rating or the like of the vapor-phase Riaruminiumu oxide film by the film method while, the a firefly on the magnet body surface Ti
- the oxide on the surface of the magnet body is partially or mostly reduced, and the adhesion between the magnet body surface and the A1 or Ti coating is excellent, and the aluminum oxide coating on the A1 or Ti coating is further improved.
- the adhesion of the coating is remarkably improved, and the corrosion resistance is excellent, especially the adhesion to the substrate even when left for a long time at 80 ° C and 90% relative temperature.
- Deposited corrosion resistant metal coating Corrosion, abrasion resistance, by the electrically insulating Li stable Fe-BR based permanent magnet of the magnet properties are obtained.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99913637A EP0991085B1 (en) | 1998-04-16 | 1999-04-13 | Corrosion-resisting permanent magnet and method for producing the same |
US09/445,810 US6275130B1 (en) | 1998-04-16 | 1999-04-13 | Corrosion-resisting permanent magnet and method for producing the same |
DE69909569T DE69909569T2 (de) | 1998-04-16 | 1999-04-13 | Korrosionsbeständiger dauermagnet und verfahren zu seiner herstellung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/123956 | 1998-04-16 | ||
JP10123956A JPH11307328A (ja) | 1998-04-16 | 1998-04-16 | 耐食性永久磁石およびその製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999054890A1 true WO1999054890A1 (fr) | 1999-10-28 |
Family
ID=14873516
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/001945 WO1999054890A1 (fr) | 1998-04-16 | 1999-04-13 | Aimant permanent resistant a la corrosion et son procede de fabrication |
Country Status (7)
Country | Link |
---|---|
US (1) | US6275130B1 (ja) |
EP (1) | EP0991085B1 (ja) |
JP (1) | JPH11307328A (ja) |
KR (1) | KR100354371B1 (ja) |
CN (1) | CN1142561C (ja) |
DE (1) | DE69909569T2 (ja) |
WO (1) | WO1999054890A1 (ja) |
Families Citing this family (20)
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MY128597A (en) | 2000-07-10 | 2007-02-28 | Neomax Co Ltd | Method of inhibiting production of projections in metal deposited-film |
DE10134267B4 (de) * | 2001-07-18 | 2007-03-01 | Gkss-Forschungszentrum Geesthacht Gmbh | Einrichtung zur Reflexion von Röntgenstrahlen |
JP4089808B2 (ja) * | 2001-12-25 | 2008-05-28 | ケミテック株式会社 | 上消し可能なマイクロカプセル磁気泳動表示シート |
AU2003291539A1 (en) * | 2002-11-18 | 2004-06-15 | Iowa State University Research Foundation, Inc. | Permanent magnet alloy with improved high temperature performance |
WO2006054617A1 (ja) | 2004-11-17 | 2006-05-26 | Tdk Corporation | 希土類焼結磁石 |
CN101356601B (zh) * | 2005-12-28 | 2012-07-18 | 日立金属株式会社 | 稀土类磁铁及其制造方法 |
JP4835407B2 (ja) * | 2006-11-28 | 2011-12-14 | Tdk株式会社 | 希土類磁石及びその製造方法 |
CN101469428B (zh) * | 2007-12-24 | 2012-05-30 | 北京中科三环高技术股份有限公司 | 一种具有耐腐蚀膜的稀土永磁体的制造方法 |
CN101859639B (zh) * | 2010-07-06 | 2013-03-27 | 烟台正海磁性材料股份有限公司 | 一种梯度电阻R-Fe-B系磁体及其生产方法 |
CN102534611A (zh) * | 2010-12-27 | 2012-07-04 | 鸿富锦精密工业(深圳)有限公司 | 壳体及其制造方法 |
CN102691062A (zh) * | 2011-03-23 | 2012-09-26 | 鸿富锦精密工业(深圳)有限公司 | 壳体及其制造方法 |
CN103993302B (zh) * | 2014-05-27 | 2016-07-13 | 安徽大地熊新材料股份有限公司 | 一种高耐腐蚀性的烧结钕铁硼永磁材料的制备方法 |
CN104480475A (zh) | 2014-11-04 | 2015-04-01 | 烟台首钢磁性材料股份有限公司 | 钕铁硼磁体表面硬质铝膜层的制备方法 |
CN104651783B (zh) | 2015-02-12 | 2017-09-01 | 烟台首钢磁性材料股份有限公司 | 一种永磁钕铁硼磁钢表面镀铝的方法 |
KR101885666B1 (ko) | 2016-09-01 | 2018-08-06 | (주) 멀티패스 | Rf 신호를 이용한 비접촉 방식의 전도도 및 비전도체 유전율 특성변화 측정장치 |
CN107419231B (zh) * | 2017-07-26 | 2019-11-15 | 沈阳广泰真空科技有限公司 | 钕铁硼永磁防腐绝缘镀层的制备方法及具有该镀层的钕铁硼永磁体 |
RU2693887C1 (ru) * | 2018-12-19 | 2019-07-05 | Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский технологический университет "МИСиС" | Способ изготовления коррозионностойких постоянных магнитов |
CN111292951B (zh) * | 2020-02-28 | 2022-03-22 | 安徽大地熊新材料股份有限公司 | 一种提高烧结钕铁硼磁体矫顽力的方法 |
CN112176286B (zh) * | 2020-09-30 | 2022-07-15 | 福建省长汀金龙稀土有限公司 | 一种覆层、具有该覆层的金属磁体及该覆层的制备方法 |
WO2023083502A1 (fr) * | 2021-11-09 | 2023-05-19 | The Swatch Group Research And Development Ltd | Dispositif de fixation magnétique de deux éléments d'une boite de montre l'un avec l'autre et boite de montre comprenant ledit dispositif de fixation |
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JPH0653020A (ja) * | 1992-07-30 | 1994-02-25 | Tdk Corp | 酸化物永久磁石 |
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1998
- 1998-04-16 JP JP10123956A patent/JPH11307328A/ja active Pending
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1999
- 1999-04-13 KR KR1019997011826A patent/KR100354371B1/ko not_active IP Right Cessation
- 1999-04-13 US US09/445,810 patent/US6275130B1/en not_active Expired - Lifetime
- 1999-04-13 WO PCT/JP1999/001945 patent/WO1999054890A1/ja active IP Right Grant
- 1999-04-13 EP EP99913637A patent/EP0991085B1/en not_active Expired - Lifetime
- 1999-04-13 CN CNB998007471A patent/CN1142561C/zh not_active Expired - Lifetime
- 1999-04-13 DE DE69909569T patent/DE69909569T2/de not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61270308A (ja) * | 1985-05-23 | 1986-11-29 | Sumitomo Special Metals Co Ltd | 永久磁石材料の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN1272212A (zh) | 2000-11-01 |
DE69909569D1 (de) | 2003-08-21 |
DE69909569T2 (de) | 2004-02-12 |
KR100354371B1 (ko) | 2002-09-28 |
JPH11307328A (ja) | 1999-11-05 |
EP0991085A1 (en) | 2000-04-05 |
EP0991085A4 (en) | 2000-07-12 |
KR20010013808A (ko) | 2001-02-26 |
CN1142561C (zh) | 2004-03-17 |
US6275130B1 (en) | 2001-08-14 |
EP0991085B1 (en) | 2003-07-16 |
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