JPH02288306A - Manufacture of rare earth permanent magnet - Google Patents
Manufacture of rare earth permanent magnetInfo
- Publication number
- JPH02288306A JPH02288306A JP1110451A JP11045189A JPH02288306A JP H02288306 A JPH02288306 A JP H02288306A JP 1110451 A JP1110451 A JP 1110451A JP 11045189 A JP11045189 A JP 11045189A JP H02288306 A JPH02288306 A JP H02288306A
- Authority
- JP
- Japan
- Prior art keywords
- alloy powder
- butyl phthalate
- rare earth
- magnetic field
- earth permanent
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 229910052761 rare earth metal Inorganic materials 0.000 title claims description 10
- 150000002910 rare earth metals Chemical class 0.000 title claims description 10
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 19
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 18
- 239000000956 alloy Substances 0.000 claims abstract description 18
- 238000005469 granulation Methods 0.000 claims abstract description 9
- 230000003179 granulation Effects 0.000 claims abstract description 9
- 238000005056 compaction Methods 0.000 claims description 3
- 238000004663 powder metallurgy Methods 0.000 claims description 3
- 229910052723 transition metal Inorganic materials 0.000 claims 1
- 150000003624 transition metals Chemical class 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract description 2
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 229910052731 fluorine Inorganic materials 0.000 abstract 1
- 239000011737 fluorine Substances 0.000 abstract 1
- -1 fluorine hydrocarbon Chemical class 0.000 abstract 1
- 229930195733 hydrocarbon Natural products 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 239000000654 additive Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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
- H01F1/0555—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together
- H01F1/0558—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together bonded together
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Powder Metallurgy (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、サマリウム・コバルト永久磁石を代表とす
る希土類永久磁石の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing rare earth permanent magnets, typified by samarium-cobalt permanent magnets.
従来の粉末冶金法による希±Ｒ磁石の製造方法において
は、当該合金が掻めて反応性に富んでいるため、潤滑剤
等の添加剤は、一般には用いられていない。In the conventional powder metallurgy method for manufacturing rare ±R magnets, additives such as lubricants are generally not used because the alloy is highly reactive.
このような点を改良すべくなされたものが特公昭６２−
３６３６６号公報であり、磁場中成形前の合金粉末に対
して、フタル酸ジｎ−ブチルを１ 、 ｈ ｔ！以下添
加して製造する方法である。To improve these points, the Special Public Interest Publication Act of 1986-
No. 36366, 1 ht! of di-n-butyl phthalate was added to the alloy powder before compaction in a magnetic field. This is a manufacturing method by adding the following.
（発明が解決しようとする課題〕
粉末冶金法によって希土類永久磁石を製造する場合、良
好な流動性を持つ造粒粉を使用することがコストダウン
にとって重要である。しかし、特公昭６２−３６３６６
号公報には、造粒性については言及しておらず、実際、
その範囲内で合金粉末を造粒した場合、良好な造粒粉が
得られない。(Problems to be Solved by the Invention) When manufacturing rare earth permanent magnets by powder metallurgy, it is important to use granulated powder with good fluidity for cost reduction.
The publication does not mention granulation properties, and in fact,
If alloy powder is granulated within this range, good granulated powder cannot be obtained.
この発明は、上記問題点を解決するためになされたもの
であって、磁気特性に悪影響を与えずに、造粒性を向上
させることのできる添加剤の提供を目的とする。This invention was made to solve the above problems, and aims to provide an additive that can improve granulation properties without adversely affecting magnetic properties.
この発明による希土類永久磁石の製造方法は、磁場中成
形前の合金粉末に対して、フタル酸ジｎ−ブチルを１．
５ｗｔ％〜４．０ｗｔ％添加することを特徴とする。In the method for producing a rare earth permanent magnet according to the present invention, di-n-butyl phthalate is added in 1.
It is characterized by adding 5 wt% to 4.0 wt%.
この発明による希土類永久磁石の製造方法では、フタル
酸ジｎ−ブチルを添加することによって、合金粉末の表
面にフタル酸ジｎ−ブチルが吸着して覆うため、合金粉
末の摩擦力が小さくなり、成形時の磁場配向性が向上す
る。しかも、焼結工程においても悪影響を及ぼさないた
め、磁石特性を向上させることができる。また、合金粉
末表面のフタル酸ジｎ−ブチル吸着層が、造粒性を向上
させ酸化防止の働きをする。In the method for producing a rare earth permanent magnet according to the present invention, by adding di-n-butyl phthalate, the surface of the alloy powder is adsorbed and covered with di-n-butyl phthalate, so that the frictional force of the alloy powder is reduced. Improves magnetic field orientation during molding. Moreover, since it does not have an adverse effect on the sintering process, the magnetic properties can be improved. Furthermore, the di-n-butyl phthalate adsorption layer on the surface of the alloy powder improves granulation properties and acts as an antioxidant.
以下、この発明の実施例について説明する。 Examples of the present invention will be described below.
５ｓｚ（Ｃａｒ Ｆｅ＋ Ｃａｒ Ｚｒ）＋ｔからなる
合金を平均３−の粒径に微粉砕した。得られた合金粉末
に、フッ素炭化水素を溶媒としてフタル酸ジｎ−ブチル
を０ｗｔ％〜４．０ｗｔχ混合し転勤造粒した。その結
果、転勤造粒によって良好な造粒粉が得られたのは、フ
タル酸ジｎ−ブチル添加量が１ 、５ｗ ＬＸ以上であ
った。An alloy consisting of 5sz (Car Fe+Car Zr)+t was pulverized to an average particle size of 3-. The obtained alloy powder was mixed with di-n-butyl phthalate in an amount of 0 wt % to 4.0 wt χ using a fluorocarbon as a solvent, and granulated by transfer. As a result, good granulated powder was obtained by transfer granulation when the amount of di-n-butyl phthalate added was 1.5 wLX or more.
さらに、得られた造粒粉を磁場中で加圧成形した。この
成形体を真空およびアルゴン雰囲気中で、１２００℃、
１時間焼結した後、１１７０℃、１．５時間溶体化処理
して急冷し、続いて８００℃〜４００℃の間で多段時効
処理した。得られた磁石の磁気特性の測定結果を図−１
に示す、これより、フタル酸ジｎ−ブチルの添加によっ
て、Ｂｒ、 （ＯＨ）＋＋＋ａｘが向上し、２．５ｗｔ
ｘ付近でピーク値となった後、４．０ｗｔ％で無添加の
場合と同等になることがわかり、特公昭６２−３６３６
６号公頓に記載されるように１．０ｗｔ％以上の添加で
磁気特性が劣化するようなことはない。Furthermore, the obtained granulated powder was pressure-molded in a magnetic field. This molded body was heated at 1200°C in a vacuum and argon atmosphere.
After sintering for 1 hour, it was solution-treated at 1170°C for 1.5 hours, quenched, and then multi-stage aged between 800°C and 400°C. Figure 1 shows the measurement results of the magnetic properties of the obtained magnet.
From this, the addition of di-n-butyl phthalate improved Br, (OH)+++ax, and increased to 2.5wt.
It was found that after reaching a peak value near
As described in Publication No. 6, addition of 1.0 wt% or more does not cause deterioration of magnetic properties.
したがって、磁場成形前の合金粉末にフタル酸ジｎ−ブ
チルを１．５ｗｔ％〜４．０ｗｔ％添加することで、磁
気特性および造粒性が向上する。Therefore, by adding 1.5 wt% to 4.0 wt% of di-n-butyl phthalate to the alloy powder before magnetic compaction, the magnetic properties and granulation properties are improved.
上記の実施例は、Ｓｍｔ（Ｃｏｔ Ｆｅ、 Ｃａｒ Ｚ
ｒ）＋ｔで表わされるサマリウムコバルト磁石の製造に
関するものであるが、一般にＲＪ＋を系、 ＲＭｓ系の
希土類永久磁石においても、同様のフタル酸ジｎ−ブチ
ルの添加効果が認められた。The above example is based on Smt(Cot Fe, Car Z
Regarding the production of samarium cobalt magnets represented by r)+t, similar effects of addition of di-n-butyl phthalate were generally observed in RJ+-based and RMs-based rare earth permanent magnets.
この発明によれば、希土類永久磁石の磁気特性および合
金粉末の造粒性が向上する。According to this invention, the magnetic properties of the rare earth permanent magnet and the granulation properties of the alloy powder are improved.
第１図はこの発明の実施例におけるフタル酸ジｎ−ブチ
ル添加量と残留磁束密度Ｂｒ及び最大エネルギー積（Ｂ
Ｈ）＋ｗａｘの関係を示すグラフである。
以上
出願人 セイコー電子部品株式会社
代理人 弁理士 林 敬 之 助Figure 1 shows the amount of di-n-butyl phthalate added, the residual magnetic flux density Br, and the maximum energy product (B
It is a graph which shows the relationship of H)+wax. Applicant: Seiko Electronic Components Co., Ltd. Representative: Patent Attorney: Keinosuke Hayashi
Claims (1)
粉末冶金法によって希土類永久磁石を製造する方法にお
いて、造粒性及び磁場配向性を高めるため、磁場中成形
前の合金粉末に対して、フタル酸ジｎ−ブチルを１．５
ｗｔ％〜４．０ｗｔ％添加することを特徴とする希土類
永久磁石の製造方法。From alloy powder whose main components are rare earth metals and transition metals,
In a method for producing rare earth permanent magnets by powder metallurgy, in order to improve granulation properties and magnetic field orientation, 1.5 di-n-butyl phthalate is added to the alloy powder before compaction in a magnetic field.
A method for producing a rare earth permanent magnet, characterized in that wt% to 4.0wt% is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1110451A JPH02288306A (en) | 1989-04-28 | 1989-04-28 | Manufacture of rare earth permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1110451A JPH02288306A (en) | 1989-04-28 | 1989-04-28 | Manufacture of rare earth permanent magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02288306A true JPH02288306A (en) | 1990-11-28 |
Family
ID=14536052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1110451A Pending JPH02288306A (en) | 1989-04-28 | 1989-04-28 | Manufacture of rare earth permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02288306A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2707192A1 (en) * | 1993-07-08 | 1995-01-13 | Aimants Ugimag Sa | Process for the preparation of fluorine-containing cobalt rare earth type magnetic powders and corresponding densified permanent magnets |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58108711A (en) * | 1981-12-23 | 1983-06-28 | Tohoku Metal Ind Ltd | Manufacture of rare earth permanent magnet |
| JPS63147302A (en) * | 1986-12-10 | 1988-06-20 | Kanegafuchi Chem Ind Co Ltd | Composite material for permanent magnet and its manufacture |
-
1989
- 1989-04-28 JP JP1110451A patent/JPH02288306A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58108711A (en) * | 1981-12-23 | 1983-06-28 | Tohoku Metal Ind Ltd | Manufacture of rare earth permanent magnet |
| JPS63147302A (en) * | 1986-12-10 | 1988-06-20 | Kanegafuchi Chem Ind Co Ltd | Composite material for permanent magnet and its manufacture |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2707192A1 (en) * | 1993-07-08 | 1995-01-13 | Aimants Ugimag Sa | Process for the preparation of fluorine-containing cobalt rare earth type magnetic powders and corresponding densified permanent magnets |
| WO1995002252A1 (en) * | 1993-07-08 | 1995-01-19 | Ugimag S.A. | Process for the preparation of cobalt/rare earth type magnetic powders containing fluorine and corresponding densified permanent magnets |
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