WO2011125900A1 - 焼結磁石及び焼結磁石の製造方法 - Google Patents
焼結磁石及び焼結磁石の製造方法 Download PDFInfo
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- WO2011125900A1 WO2011125900A1 PCT/JP2011/058330 JP2011058330W WO2011125900A1 WO 2011125900 A1 WO2011125900 A1 WO 2011125900A1 JP 2011058330 W JP2011058330 W JP 2011058330W WO 2011125900 A1 WO2011125900 A1 WO 2011125900A1
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- sintered magnet
- surface roughness
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
-
- 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
- H01F1/06—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 in the form of particles, e.g. powder
- H01F1/08—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 in the form of particles, e.g. powder pressed, sintered, or bound together
-
- 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
- H01F1/10—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
-
- 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
-
- 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
- H01F41/0266—Moulding; Pressing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0205—Magnetic circuits with PM in general
- H01F7/021—Construction of PM
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Definitions
- the sintered magnet in order to manufacture a thin sintered magnet, it is necessary to thin the sintered body having a certain thickness by processing such as polishing. However, if the sintered magnet is processed to make it thinner, the mechanical strength of the sintered magnet may be reduced, and processing is also difficult. In particular, when the thickness of the sintered magnet is less than 4 mm, the mechanical strength of the sintered magnet is significantly reduced.
- the sintered magnet according to the present invention is a sintered magnet formed by sintering a magnetic material.
- the sintered magnet has a thickness at the center of gravity of 3.5 mm or less and a surface roughness Rz of 2.5 ⁇ m or less. It is characterized by being.
- the strength of the sintered magnet increases. Even in a sintered magnet having a thickness of 3.5 mm or less, if the surface roughness Rz is 2.5 ⁇ m or less, a practically sufficient strength can be secured.
- FIG. 6A is an explanatory diagram of a method for measuring the intensity.
- FIG. 6B is an explanatory diagram of sample dimensions.
- FIG. 6C is an explanatory diagram of sample dimensions.
- FIG. 7 is a diagram showing the relationship between the strength shown in Table 1 and the surface roughness Rz.
- FIG. 8 is a diagram in which the strength shown in Table 1 is converted into the strength per unit thickness of the sintered magnet and expressed in relation to the surface roughness Rz.
- the molded body was manufactured using CIM, but the method of manufacturing the molded body by the method for manufacturing a sintered magnet according to the present embodiment is not limited to this.
- the obtained molded body is sintered (step S26).
- the molded body obtained in step S25 is sintered in a vacuum (reduced pressure atmosphere) for a predetermined time under a predetermined temperature condition, whereby a sintered body is obtained.
- the sintering temperature is in the range of 1000 ° C. to 1100 ° C., and the compact is sintered for about 1 hour to 10 hours. If the sintering time is short, the density and magnetic properties of the sintered body obtained will vary greatly, and if the sintering time is too long, the productivity of the sintered magnet will decrease. For this reason, the sintering time is determined in consideration of the balance between the variation and the productivity.
- the sintered body that has been subjected to the aging treatment is processed as necessary (step S28).
- the sintered magnet according to the present embodiment needs to have a surface roughness Rz of 2.5 ⁇ m or less before the surface treatment is performed. For this reason, the surface of the sintered body that has been subjected to the aging treatment and has undergone the necessary processing is polished as necessary so that the surface roughness Rz is 2.5 ⁇ m or less, thereby forming a sintered magnet. Since this sintered magnet has a surface roughness Rz of 2.5 ⁇ m or less, sufficient strength can be ensured even if the sintered magnet is thinned.
- the sintered magnet having a surface roughness Rz of 2.5 ⁇ m or less is subjected to surface treatment (plating or resin coating) for inhibiting corrosion. The sintered magnet is magnetized after this.
- exceeding the predetermined specific strength depends on the thickness or the surface roughness Rz, and each has a preferable range. Further, as the thickness of the sample decreases, the range of the surface roughness Rz exceeding the predetermined specific strength tends to increase. A preferable range of the thickness and the surface roughness Rz exceeding the predetermined specific strength is shown below. In each thickness range, when the surface roughness Rz is set to the respective ranges shown below, a predetermined specific strength can be ensured. (1) When the thickness is larger than 2.5 mm and not larger than 3.5 mm, Rz is not smaller than 0.1 ⁇ m and not larger than 1.6 ⁇ m.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electromagnetism (AREA)
- Physics & Mathematics (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
図3は、本実施形態に係る焼結磁石の製造方法の手順を示すフローチャートである。本実施形態に係る焼結磁石の製造方法では、まず、フェライト焼結磁石について説明する。出発原料の粉末(原料粉末)を準備して秤量したら、原料粉末を、例えば、湿式アトライターで粉砕しながら混合する(ステップS11)。原料粉末は、特に限定されない。粉砕されながら混合された原料粉末は、乾燥された後に整粒されてから、仮焼される(ステップS12)。仮焼において、原料粉末は、例えば、空気中で、1000℃から1350℃で1時間から10時間程度、焼成される。原料粉末を仮焼することによって、顆粒状の仮焼体が得られる。
図5は、本実施形態に係る焼結磁石の製造方法の手順を示すフローチャートである。次に説明する焼結磁石は、金属焼結磁石であって、R-Fe-B(Rは希土類元素)の組成を有する希土類焼結磁石である。本実施形態に係る焼結磁石の製造方法が適用できる金属焼結磁石はこれに限定されるものではない。本実施形態において、焼結磁石は、その最終組成となるように二種以上の合金を組み合わせた後に焼結して製造される。本実施形態では、R2Fe14B結晶粒を主体とする合金(低R合金)と、低R合金よりRを多く含む合金(高R合金)とを組み合わせるが、三種以上の合金を組み合わせてもよい。また、一種の合金から希土類焼結磁石を製造してもよい。本実施形態に係る焼結磁石の製造方法を用いて焼結磁石を製造するにあたり、低R合金及び高R合金が作製される(ステップS21)。
表面粗さ又は厚みが異なる焼結磁石を製造して、強度を評価した。製造された焼結磁石は、フェライト焼結磁石であり、射出成形によって製造された。以下における比較例は、従来例を意味するものではない。まず、焼結磁石の製造方法を説明する。出発原料として、Fe2O3粉末と、SrCO3粉末と、La(OH)3粉末と、CaCO3粉末と、Co3O4粉末とを準備した。これらを所定量秤量し、添加物とともに、湿式アトライターで粉砕した後、乾燥させて整粒した。その後、空気中において、1230℃で3時間焼成して顆粒状の仮焼体を得た。
σ[N/mm2]=3×L×F/(2×A×T2)・・・(1)
図6-2に示すように、Lは試料長さ[mm]、Aは矩形端部1CT間の距離[mm]である。図6-3に示すように、Tは試料厚み[mm]である。また、Fは荷重[N]である。本評価において、Lは9.0mm、Aは7.1mm、Tは1.0mm、2.0mm、3.0mmである。
(1)厚みが2.5mmより大きく3.5mm以下である場合、Rzは0.1μm以上1.6μm以下。
(2)厚みが2.0mmより大きく2.5mm以下である場合、Rzは0.1μm以上1.9μm以下。
(3)厚みが1.5mmより大きく2.0mm以下である場合、Rzは0.1μm以上2.2μm以下。
(4)厚みが1.0mmより大きく1.5mm以下である場合、Rzは0.1μm以上2.4μm以下。
(5)厚みが1.0mm以下である場合、Rzは0.1μm以上2.75μm(好ましくは2.5μm)以下。
1C 試料
1CT 矩形端部
2 射出成形機
3 磁場印加装置
4 投入口
5 スクリュー
6 押出機
6C 筐体
6H 射出口
7 ペレット
8 金型
9 キャビティ
10 荷重付与体
11 試験台
Claims (3)
- 磁性材料を焼結してなる焼結磁石であり、当該焼結磁石の重心位置における厚みが3.5mm以下、かつ、表面粗さRzが2.5μm以下であることを特徴とする焼結磁石。
- 前記表面粗さRzは、0.1μm以上である請求項1に記載の焼結磁石。
- 前記焼結磁石は、フェライト焼結磁石である請求項1又は2に記載の焼結磁石。
Priority Applications (5)
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US13/637,559 US8986568B2 (en) | 2010-03-31 | 2011-03-31 | Sintered magnet and method for producing the sintered magnet |
CN201180017121.1A CN102918607B (zh) | 2010-03-31 | 2011-03-31 | 烧结磁铁和烧结磁铁的制造方法 |
JP2012509610A JP5382206B2 (ja) | 2010-03-31 | 2011-03-31 | 焼結磁石及び焼結磁石の製造方法 |
KR1020127025572A KR101421555B1 (ko) | 2010-03-31 | 2011-03-31 | 소결 자석 |
EP11765800.5A EP2555209B1 (en) | 2010-03-31 | 2011-03-31 | Sintered magnet and method for manufacturing sintered magnet |
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EP (1) | EP2555209B1 (ja) |
JP (1) | JP5382206B2 (ja) |
KR (1) | KR101421555B1 (ja) |
CN (1) | CN102918607B (ja) |
WO (1) | WO2011125900A1 (ja) |
Cited By (3)
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WO2014087932A1 (ja) * | 2012-12-03 | 2014-06-12 | Tdk株式会社 | Srフェライト焼結磁石の製造方法 |
FR3000835A1 (fr) * | 2013-01-10 | 2014-07-11 | Commissariat Energie Atomique | Procede de fabrication d'aimants permanents par utilisation d'un fluide supercritique tel que le co2 supercritique |
JP2017130674A (ja) * | 2017-03-03 | 2017-07-27 | Tdk株式会社 | フェライト焼結磁石 |
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JP5732979B2 (ja) * | 2011-03-31 | 2015-06-10 | Tdk株式会社 | フェライト焼結磁石及びモータ |
JP2015207687A (ja) * | 2014-04-22 | 2015-11-19 | 日東電工株式会社 | 永久磁石及び永久磁石の製造方法 |
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2011
- 2011-03-31 US US13/637,559 patent/US8986568B2/en active Active
- 2011-03-31 EP EP11765800.5A patent/EP2555209B1/en active Active
- 2011-03-31 CN CN201180017121.1A patent/CN102918607B/zh active Active
- 2011-03-31 JP JP2012509610A patent/JP5382206B2/ja active Active
- 2011-03-31 WO PCT/JP2011/058330 patent/WO2011125900A1/ja active Application Filing
- 2011-03-31 KR KR1020127025572A patent/KR101421555B1/ko active IP Right Grant
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2014087932A1 (ja) * | 2012-12-03 | 2014-06-12 | Tdk株式会社 | Srフェライト焼結磁石の製造方法 |
CN104380403A (zh) * | 2012-12-03 | 2015-02-25 | Tdk株式会社 | Sr铁氧体烧结磁铁的制造方法 |
FR3000835A1 (fr) * | 2013-01-10 | 2014-07-11 | Commissariat Energie Atomique | Procede de fabrication d'aimants permanents par utilisation d'un fluide supercritique tel que le co2 supercritique |
WO2014108609A1 (fr) * | 2013-01-10 | 2014-07-17 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Procede de fabrication d'aimants permanents par utilisation d'un fluide supercritique tel que le co2 supercritique |
JP2017130674A (ja) * | 2017-03-03 | 2017-07-27 | Tdk株式会社 | フェライト焼結磁石 |
Also Published As
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US8986568B2 (en) | 2015-03-24 |
EP2555209A4 (en) | 2014-03-12 |
EP2555209B1 (en) | 2018-11-14 |
KR20120135294A (ko) | 2012-12-12 |
KR101421555B1 (ko) | 2014-07-22 |
CN102918607A (zh) | 2013-02-06 |
CN102918607B (zh) | 2016-11-09 |
JPWO2011125900A1 (ja) | 2013-07-11 |
JP5382206B2 (ja) | 2014-01-08 |
EP2555209A1 (en) | 2013-02-06 |
US20130027160A1 (en) | 2013-01-31 |
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