JPH01251702A - Plastic magnet and manufacture thereof - Google Patents
Plastic magnet and manufacture thereofInfo
- Publication number
- JPH01251702A JPH01251702A JP63079566A JP7956688A JPH01251702A JP H01251702 A JPH01251702 A JP H01251702A JP 63079566 A JP63079566 A JP 63079566A JP 7956688 A JP7956688 A JP 7956688A JP H01251702 A JPH01251702 A JP H01251702A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- magnetic
- plastic magnet
- fluororesin
- fluorine resin
- 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
- 239000004033 plastic Substances 0.000 title claims abstract description 53
- 229920003023 plastic Polymers 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000006247 magnetic powder Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 27
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 17
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000006249 magnetic particle Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 6
- 229910000531 Co alloy Inorganic materials 0.000 claims abstract 2
- 238000010304 firing Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 239000011812 mixed powder Substances 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 229920005989 resin Polymers 0.000 abstract description 10
- 239000011347 resin Substances 0.000 abstract description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 229920001577 copolymer Polymers 0.000 abstract description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract 6
- 239000011737 fluorine Substances 0.000 abstract 6
- 229910052731 fluorine Inorganic materials 0.000 abstract 6
- 239000011230 binding agent Substances 0.000 description 10
- 239000004677 Nylon Substances 0.000 description 9
- 229920001778 nylon Polymers 0.000 description 9
- 229910017052 cobalt Inorganic materials 0.000 description 8
- 239000010941 cobalt Substances 0.000 description 8
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 8
- 238000005452 bending Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- 238000000748 compression moulding Methods 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- -1 o. As a result Chemical class 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000012300 argon atmosphere Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 101000606535 Homo sapiens Receptor-type tyrosine-protein phosphatase epsilon Proteins 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 102100039665 Receptor-type tyrosine-protein phosphatase epsilon Human genes 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 1
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は、プラスチックまたはゴムに磁性粉末を分散さ
せたプラスチック磁石に関し、詳しくは耐熱性の向上し
たプラスチック磁石とその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plastic magnet in which magnetic powder is dispersed in plastic or rubber, and more particularly to a plastic magnet with improved heat resistance and a method for manufacturing the same.
［従来の技術と問題点］
プラスチック磁石は次に挙げるような焼結磁石 ・で
は得られない利点を有するため近年需要が著しく伸長し
ている。[Prior Art and Problems] Plastic magnets have the following advantages that cannot be obtained with sintered magnets, so demand for them has increased significantly in recent years.
（１）複雑薄肉形状のものが容易に得られる、（２）ラ
ジアル異方性のものが容易に得られる、（３）焼結磁石
に比較して脆弱さが少い、（４）量産性に優れる。こと
など
反面プラスチック磁石は磁性粉末を結合する非磁性のプ
ラスチックを加えであるため、その分だけ磁石特性が低
下するのは不可避であり、このことが焼結磁石と比較し
た場合のプラスチック磁石の短所となっている。そして
プラスチック磁石と焼結磁石を比較した時のプラスチッ
ク磁石の欠点として見逃してはならないものとして耐熱
性が挙げられる。これも前記磁石特性と同様磁性粉末を
結合するプラスチックの特性に起因するもので、プラス
チック磁石の用途が限定される要因となっている。(1) Complex thin-walled shapes can be easily obtained, (2) Radial anisotropy can be easily obtained, (3) Less brittle than sintered magnets, (4) Mass-producible. Excellent in On the other hand, since plastic magnets contain non-magnetic plastic that binds magnetic powder, it is inevitable that the magnetic properties will deteriorate accordingly, and this is a disadvantage of plastic magnets compared to sintered magnets. It becomes. When comparing plastic magnets and sintered magnets, a drawback of plastic magnets that should not be overlooked is heat resistance. This is also due to the characteristics of the plastic that binds the magnetic powder, similar to the magnetic characteristics described above, and is a factor that limits the uses of plastic magnets.
一方で磁石が組み込まれる電気機器の高機能化、高集積
化への要求は増々増大しているため磁石の高性能化への
要求も高くならざるを得ない。On the other hand, as the demand for higher functionality and higher integration of electrical equipment in which magnets are incorporated is increasing, the demand for higher performance magnets is also increasing.
このような観点からプラスチック磁石を見ると磁石特性
を向上するため、市場は従来のフェライト系からＳｍＣ
ｏを主とした希土類系へと動きつつある。それに伴うよ
うに耐熱性の向上も図られ、。Looking at plastic magnets from this perspective, the market has shifted from the conventional ferrite type to SmC to improve magnetic properties.
There is a movement towards rare earth metals, mainly o. As a result, heat resistance has also been improved.
従来バインダーとして多用されているナイロン６、ナイ
ロン１２よりも高融点を持つポリブチレンテレフタレー
ト（ＰＢＴ）やポリフェニルサルファイド（ＰＰＳ）を
ベースポリマーとしたものも市販され始めているが、こ
れらは、例えば熱変形温度のような短時間での評価法の
みを基準としたものであり、長期的な耐熱寿命となると
電気機器に組み込まれる他のプラスチック部品のように
は注意が払われていないのが現状である。Products based on polybutylene terephthalate (PBT) and polyphenylsulfide (PPS), which have higher melting points than nylon 6 and nylon 12, which are commonly used as binders, have begun to be commercially available. It is based only on short-term evaluation methods such as temperature, and the current situation is that the long-term heat-resistant lifespan does not receive the same attention as other plastic parts incorporated into electrical equipment. .
このことはプラスチック磁石が広く使用され始めてから
日が浅いことと、従来の焼結磁石がキューリー温度以下
の温度での耐熱性はほとんど問題にならなかったことか
ら、機器を設計する側がプラスチック磁石についても同
様に考えていることによると思われる。This is due to the fact that plastic magnets have only recently been widely used, and the heat resistance of conventional sintered magnets at temperatures below the Curie temperature was hardly a problem. It seems that they are thinking the same way.
プラスチックの長期的な信頼性を考えるについては長期
的な耐熱性を確実に評価する必要があり、たとえばＵＬ
では加熱劣化促進試験のデータをもとに各製品毎に使用
温度を規格化している。When considering the long-term reliability of plastics, it is necessary to reliably evaluate the long-term heat resistance.
has standardized the operating temperature for each product based on data from accelerated heat deterioration tests.
それによると磁性粉末を含まないナイロンそのものでは
概ね１００℃以下、ナイロンより熱変形温度が高いＰＢ
Ｔ、ＰＰＳでも夫々概ね、１２０”Ｃ，２００℃である
。また圧縮成形型プラスチック磁石に多用されているエ
ポキシ樹脂では樹脂そのものが熱硬化型であるため、短
期的な耐熱性は高いものの２００℃以上の温度では徐々
に分解が始まり、その使用温度は１００℃以下と思われ
る。According to this, nylon itself without magnetic powder is generally below 100℃, and PB has a higher heat deformation temperature than nylon.
The temperatures for T and PPS are approximately 120"C and 200°C, respectively.Also, in the case of epoxy resin, which is often used in compression-molded plastic magnets, the resin itself is thermosetting, so although it has high short-term heat resistance, it can be heated to 200"C. At temperatures above this, decomposition begins gradually, and the operating temperature is thought to be 100°C or lower.
従って長期的な信頼性という視点では現在市販されてい
るプラスチック磁石の中ではＰＰＳをベースポリマーと
するものが最も優れていると言えるが、これ以上の耐熱
性の要求には現状では対応できない状態である。Therefore, from the perspective of long-term reliability, it can be said that of the plastic magnets currently on the market, those with a base polymer of PPS are the best, but they cannot currently meet the demands for higher heat resistance. be.
［発明が解決しようとする課題］
前述のようにプラスチック磁石の耐熱性はバインダーと
して使用されるポリマーの耐熱性に左右される。現在市
販されているポリマーでＰＰＳより高い耐熱性を具備し
たものの代表的なものにフッ素樹脂がある。しかしたと
えばポリテトラフルオロエチレン（ＰＴＦＥ）は融点が
３２７℃と高く、溶融粘度も高いため従来のプラスチッ
ク磁石と同様の工程では成形体を得ることができない。[Problems to be Solved by the Invention] As mentioned above, the heat resistance of plastic magnets depends on the heat resistance of the polymer used as a binder. Fluororesin is a typical polymer currently available on the market that has higher heat resistance than PPS. However, polytetrafluoroethylene (PTFE), for example, has a high melting point of 327° C. and a high melt viscosity, so it is not possible to obtain a molded body through the same process as conventional plastic magnets.
また上記したＰＴＦＢの特性に起因する成形性の低さを
改良するため他のモノマーとの共重合体等も市販されて
いるが、これらは耐熱性の点ではＰＴＦＥよりも劣った
ものとなる場合が多い。In addition, copolymers with other monomers are commercially available to improve the poor moldability caused by the above-mentioned characteristics of PTFE, but these may be inferior to PTFE in terms of heat resistance. There are many.
本発明は斯かる問題点に鑑み、ＰＴＦＥ等のフッ素樹脂
そのものの成形品を得る工程見直しを検討し耐熱性又は
耐食性に優れたプラスチック磁石及びその製造方法を提
供することを目的とする。In view of such problems, an object of the present invention is to provide a plastic magnet with excellent heat resistance or corrosion resistance, and a method for manufacturing the same, by reviewing the process of obtaining a molded product of fluororesin such as PTFE itself.
［課題を解決するための手段］
本発明によれば、磁性粒子と、この磁性粒子間に介在す
るフッ素樹脂層よりなり、このフッ素樹脂層は、磁性粒
子を互いに結合していることを特徴とするプラスチック
磁石が得られる。[Means for Solving the Problem] According to the present invention, the magnetic particle is composed of magnetic particles and a fluororesin layer interposed between the magnetic particles, and the fluororesin layer is characterized in that the magnetic particles are bonded to each other. A plastic magnet is obtained.
また本発明によれば、５０〜１００ｖｏｌ％（１００を
含まず）の磁性粉末に０〜５０ｖｏｌ％（０を含まず）
のフッ素樹脂粉末を混合する混合工程と、混合された粉
末を圧縮成形し成形体を得る成形工程と、この成形体を
上記フッ素樹脂の融点前後の所定温度を保持し炉中で焼
成することを含む焼成工程とを有し、この焼成工程は、
成形体に含有されたフッ素樹脂粉末を融着することを特
徴とするプラスチック磁石の製造方法が得られる。Further, according to the present invention, 0 to 50 vol% (not including 0) is added to 50 to 100 vol% (not including 100) of the magnetic powder.
A mixing step of mixing fluororesin powders, a molding step of compression molding the mixed powder to obtain a molded body, and firing this molded body in a furnace while maintaining a predetermined temperature around the melting point of the fluororesin. This firing step includes:
A method for producing a plastic magnet is obtained, which comprises fusing fluororesin powder contained in a molded body.
ここで本発明においては成形工程は、磁場中で行うこと
により磁性粉末を配向させることが望ましい。Here, in the present invention, it is desirable that the molding step be performed in a magnetic field to orient the magnetic powder.
また、フッ素樹脂粉末の平均粒径は、上記磁性粉末より
小なることが望ましい。Further, it is desirable that the average particle size of the fluororesin powder is smaller than that of the magnetic powder.
即ち磁性粉末と同等以下のＰＴＦＥ粉末と磁性粉末を混
合した材料を圧縮成形した後焼成することによりＰＴＦ
Ｅで結合されていることを特徴とするプラスチック磁石
が得られる。In other words, PTF is created by compression molding a material that is a mixture of PTFE powder and magnetic powder, which is equivalent to or smaller than magnetic powder, and then firing it.
A plastic magnet is obtained which is characterized in that it is bonded by E.
ここで使用されるフッ素樹脂としては前記ＰＴＰＥの他
にテトラフルオロエチレン−ヘキサフルオロプロピレン
共重合体（ＦＥＰ）が使用できる。フッ素樹脂として上
記以外に市販されているものとしてはポリクロロトリフ
ルオロエチレン、ポリビニリデンフルオライド、ポリビ
ニルフルオライドなどが挙げられるが、これらは融点が
夫々、２１２〜２１７℃、１６５〜１８５℃、２１０〜
２３０℃と低いため本発明の目的には沿わない。As the fluororesin used here, in addition to the above-mentioned PTPE, a tetrafluoroethylene-hexafluoropropylene copolymer (FEP) can be used. Commercially available fluororesins other than those listed above include polychlorotrifluoroethylene, polyvinylidene fluoride, and polyvinyl fluoride, which have melting points of 212 to 217°C, 165 to 185°C, and 210°C, respectively. ~
Since the temperature is as low as 230°C, it does not meet the purpose of the present invention.
これらのフッ素樹脂は前述のように磁性粉末と混合して
成形することから粉末とし使用することが必要であり、
その粒度は磁性粉末を均一に被覆しなければならないこ
とから、少くとも磁性粉末よりは微細にすることが望ま
しい。As mentioned above, these fluororesins must be mixed with magnetic powder and molded, so they must be used as powder.
Since the particle size must be uniformly coated with the magnetic powder, it is desirable that the particle size be at least finer than that of the magnetic powder.
また磁性粉末とフッ素樹脂粉末の混合比率は製品に要求
される磁石特性、機械的強度によって異なるが、フッ素
樹脂が多過ぎると磁気特性の低下を招き、少な過ぎると
機械的な強度が低下するばかりか満足な成形体が得られ
ないことがあり、その最も望ましい混合比率は磁性粉末
／フッ素樹脂粉末＝５５〜７５／４５〜２５（容量ｖａ
ｔ％）である。In addition, the mixing ratio of magnetic powder and fluororesin powder varies depending on the magnetic properties and mechanical strength required for the product, but too much fluororesin will cause a decrease in magnetic properties, and too little will only cause a decrease in mechanical strength. The most desirable mixing ratio is magnetic powder/fluororesin powder = 55-75/45-25 (capacity va.
t%).
次に本発明に使用される磁性粉末について述べる０本発
明には粉末として得られる磁性材料であれば基本的に特
に制限なく使用可能で、たとえば硬質磁性材料としてバ
リウム・フェライト、ストロンチウム・フェライト、希
土預・コバルト、ネオジム・鉄・ホウ素などが挙げられ
、軟質磁性材料としてマンガン・亜鉛・フェライト、パ
ーマロイなどが挙げられる。粉末の粒度は特に規制され
るものではないが混合・成形などの作業性、製品の外観
などを考慮すると平均粒径１００μｍ以下を使用した方
が良いが望ましくは２０μｍ以下である。従って使用さ
れるフッ素樹脂粉末の平均粒径も２０μｍ以下とするの
が好ましい。Next, the magnetic powder used in the present invention will be described. In the present invention, basically any magnetic material obtained in the form of powder can be used without any particular restrictions. For example, as hard magnetic materials, barium ferrite, strontium ferrite, rare Examples include clay deposits, cobalt, neodymium, iron, and boron, and soft magnetic materials include manganese, zinc, ferrite, and permalloy. The particle size of the powder is not particularly restricted, but considering workability in mixing and molding, appearance of the product, etc., it is better to use an average particle size of 100 μm or less, preferably 20 μm or less. Therefore, it is preferable that the average particle size of the fluororesin powder used is also 20 μm or less.
次に本発明の製造方法について説明する０本発明の製造
方法は原料粉末として前述のようにフッ素樹脂粉末と磁
性粉末の混合物を使用する他は焼結磁石を製造する工程
とほぼ同様で、焼成工程の焼成温度が通常の焼結温度よ
りも低い点で異なる。Next, the manufacturing method of the present invention will be explained.The manufacturing method of the present invention is almost the same as the process of manufacturing sintered magnets, except that a mixture of fluororesin powder and magnetic powder is used as the raw material powder, as described above. The difference is that the firing temperature of the process is lower than the normal sintering temperature.
またフッ素樹脂粉末と磁性粉末の混合にはヘンシェルミ
キサー、リボンブレンダーなどが使用できる。Further, a Henschel mixer, a ribbon blender, etc. can be used to mix the fluororesin powder and magnetic powder.
圧縮成形は通常の焼結用圧粉体を製造する装置が使用で
き、異方性磁石を得る場合、圧縮成形を磁場中で行うこ
とも焼結磁石と同様であるが、次工程で磁性粉末の焼結
を行うわけではないのでラジアル異方性のものを得るこ
とも容易である。焼成は炉中で行うが、フッ素樹脂を加
熱すると腐食性のガスを発生することがあるので、特に
磁性粉末が合金系の場合はガスを速やかに除去するため
に真空中で行うことが望ましい。Compression molding can be performed using equipment that normally produces green compacts for sintering, and when obtaining anisotropic magnets, compression molding can be performed in a magnetic field in the same way as sintered magnets, but in the next step, magnetic powder is Since sintering is not performed, it is easy to obtain a product with radial anisotropy. Firing is performed in a furnace, but since corrosive gas may be generated when the fluororesin is heated, it is desirable to perform the firing in a vacuum to quickly remove the gas, especially if the magnetic powder is an alloy.
［実施例］ 本発明の実施例を図面を参照し説明する。[Example] Embodiments of the present invention will be described with reference to the drawings.
実施例１
本発明の実施例１について説明する。第１図は、本発明
の実施例に係るプラスチック磁石の各熱劣化試験温度と
成形体の強度の半減期との関係を示す図である。この図
において強度の半減期とは、成形体、曲げ強度が初期値
の５０％となるまでの時間である。直線１１は、ＰＴＦ
Ｅ樹脂をバインダとした希土類コバルト磁石（試料１）
減期の温度特性を示す。Example 1 Example 1 of the present invention will be described. FIG. 1 is a diagram showing the relationship between each thermal deterioration test temperature of a plastic magnet according to an example of the present invention and the half-life of the strength of a molded body. In this figure, the half-life of strength is the time it takes for the bending strength of the molded product to reach 50% of its initial value. Straight line 11 is PTF
Rare earth cobalt magnet using E resin as a binder (sample 1)
Shows the temperature characteristics of the expiration period.
直線３３は比較の為に、ナイロンを含有する原料粉末か
ら得られた希土類コバルト磁石（試料２）の強度の半減
期の温度特性を示す。For comparison, a straight line 33 shows the temperature characteristics of the half-life of the strength of a rare earth cobalt magnet (sample 2) obtained from raw material powder containing nylon.
この図から明らかな様に、実施例１に係るプラスチック
希土類コバルト磁石は耐熱性が極めて優れていることが
判る。As is clear from this figure, it can be seen that the plastic rare earth cobalt magnet according to Example 1 has extremely excellent heat resistance.
第１表は、本発明の実施例に係るプラスチック磁石の磁
石特性を示す、この表において、第１図と同じく試料ｌ
はＰＴＦＥｖ！１脂をバインダとした希土類コバルト磁
石の磁石特性、また比較の為に、ナイロンをバインダと
した希土類コバルト磁石の磁石特性を試料２として併記
した。Table 1 shows the magnetic characteristics of the plastic magnet according to the example of the present invention.
is PTFEv! The magnetic properties of a rare earth cobalt magnet using nylon as a binder are also shown as Sample 2 for comparison.
以下弦白
この表から明らかな様に、実施例１に係るプラ １ス
チック磁石の磁石特性がナイロンをバインダと、 ■し
たものよりも優れていることが判明した。 ′
実施例１に係るプラスチック磁石は、次のよう ｆ：
に製造された２−１７系希土類コバルトのインテ タ
ラ１−をアルゴン雰囲気で１，１８０℃で３時間溶体化
、急冷し、８００℃で４時間時効、炉冷した。ｃ′この
インゴットをショークラッシャー、ディスク １ミル
で粗粉砕、ボールミルで微粉砕し、平均粒径 イ１７
μｍの粉末を得た。この磁性粉末と平均粒径５μｍのＰ
ＴＦＥの粉末を重量比で８８／１２と 遍なるように
秤量してリボンブレンダーで均一になるまで撹拌し、成
形用原料粉末を得た。この原料 ｆ粉末をφ１５及び
７０ｎｎ＋Ｘ１５ｍなる圧縮成形用 ２金型に所要量
充填し、４００に（］ ／ ｔｓ ２の圧力で成 石
彫し、直径１５ｒｍ、厚さ１０市（第１の圧粉体）及び
樅７０市、横１５市、厚さ１０市（第２の圧粉体）形状
の圧粉体をそれぞれ得た。第１の圧粉体の成形は磁性粉
末を配向させるため１８ｋＯｅの ｌ磁場中で行った
１次のこの圧粉体を炉に装入し、 ６Ｌ Ｏ−’Ｔｏ
ｒｒ以下となるまで真空引きし、２００℃ｒの速度で３
６０℃まで昇温し３時間焼成後約３００℃／Ｈｒの速度
で冷却し成形体を得た。焼成灸の収縮率は成形時の圧力
方向には無関係で約６≦であった。第１表は得られた円
筒状の成形体（試料１）で磁石特性を、角柱形状の成形
体で曲ｒ強度を夫々測定した結果である。また第１図の
ｔ線１１は角柱状の成形体には加熱劣化促進試験ヒ施し
、曲げ強度の変化の測定結果である。As is clear from this table, the magnetic properties of the plastic magnet according to Example 1 were found to be superior to those using nylon as a binder. ′
The plastic magnet according to Example 1 has the following f:
A 2-17 rare earth cobalt integral 1 produced in 1997 was solution-treated and rapidly cooled at 1,180°C for 3 hours in an argon atmosphere, aged at 800°C for 4 hours, and then furnace-cooled. c' This ingot was coarsely crushed using a show crusher, a disk 1 mill, and finely crushed using a ball mill to obtain an average particle size of 17
A powder of μm size was obtained. This magnetic powder and P with an average particle size of 5 μm
TFE powder was weighed out so that the weight ratio was 88/12, and stirred with a ribbon blender until it became uniform, to obtain a raw material powder for molding. The required amount of this raw material f powder was filled into two compression molding molds of φ15 and 70 nn + x 15 m, and stone-carved at a pressure of 400 mm (] / ts 2, with a diameter of 15 rm and a thickness of 10 mm (first compact). A green compact with a fir size of 70 cm, a width of 15 cm, and a thickness of 10 cm (second compact) was obtained.The first compact was molded using a magnetic field of 18 kOe to orient the magnetic powder. This primary green compact made in the furnace is charged into a furnace, and
Evacuate until the temperature is below rr, and heat at 200℃r for 3
The temperature was raised to 60°C, fired for 3 hours, and then cooled at a rate of about 300°C/Hr to obtain a molded body. The shrinkage rate of firing moxibustion was approximately 6≦, regardless of the pressure direction during molding. Table 1 shows the results of measuring the magnetic properties of the obtained cylindrical molded body (Sample 1) and the bending r strength of the prismatic molded body. In addition, the t-line 11 in FIG. 1 shows the measurement results of changes in bending strength when the prismatic molded body was subjected to a heating deterioration acceleration test.
比教例に係るプラスチック磁石は次のように製置された
や
実施例−１と同様に調整した希土類コバルトの；）末を
ナイロン１２粉末と重量比で９３／７とな５ように秤量
、混合し、２軸押用機にて混練後粉ヤして射出成形用の
原料ペレットを得た。The plastic magnet according to the example was prepared as follows: Rare earth cobalt ; The mixture was mixed, kneaded using a twin-screw extruder, and then ground to obtain raw material pellets for injection molding.
この原料を磁場射出成形機にて成形し、直径１５柑、厚
さ１０開、ｆｉｌ ７０ ｎｕｎ、横１５ＩｌｌＩ、厚
さ１０市なる形状の成形体（試料２）を得た。これ−の
成形体について実施例１に係る試料と同様の式験を行い
、第１表、第１図に結果を示した。This raw material was molded using a magnetic field injection molding machine to obtain a molded article (sample 2) having a diameter of 15 mm, a thickness of 10 mm, a fill of 70 mm, a width of 15 mm, and a thickness of 10 mm. The same tests as for the sample according to Example 1 were conducted on this molded body, and the results are shown in Table 1 and FIG.
実施例２
本発明の実施例２について説明する。第２図は、本発明
の実施例２に係るプラスチック磁石の各熱劣化試験温度
と成形体の強度の半減期との関係を示す図である。Example 2 Example 2 of the present invention will be described. FIG. 2 is a diagram showing the relationship between each thermal deterioration test temperature of the plastic magnet according to Example 2 of the present invention and the half-life of the strength of the molded body.
この図において直線１２は、ＰＴＦＥＩ！！脂をバイン
ダとした希土類プラスチック磁石の強度の半減期の温度
の関係を示す。In this figure, the straight line 12 indicates PTFEI! ! This figure shows the relationship between the half-life of strength and temperature of rare earth plastic magnets using fat as a binder.
直線３４は比較の為に、ナイロンをバインダとした希土
類プラスチック磁石の曲げ強度と温度の関係を示す、こ
の図から明らかな様に、実施例に係るプラスチック希土
類磁石は耐熱性が極めて優れていることが判る。For comparison, the straight line 34 shows the relationship between the bending strength and temperature of a rare earth plastic magnet using nylon as a binder.As is clear from this figure, the plastic rare earth magnet according to the example has extremely excellent heat resistance. I understand.
第２表は本発明の実施例２に係るプラスチック磁石の磁
石特性を示す、この表において実施例２に係る試料３は
ＰＴＦＥ＃Ｍ脂をバインダとした希土類プラスチック磁
石の磁石特性を示す、比較の為に、ナイロンをバインダ
とした希土類コバルトプラスチック磁石の磁石特性を試
料４として併記した。Table 2 shows the magnetic characteristics of the plastic magnet according to Example 2 of the present invention. In this table, Sample 3 according to Example 2 shows the magnetic characteristics of a rare earth plastic magnet using PTFE #M resin as a binder. Therefore, the magnetic properties of a rare earth cobalt plastic magnet using nylon as a binder are also listed as sample 4.
この表から明らかな様に、実施例２に係るプラスチック
磁石の磁石特性がナイロンをバインダと １したもの
より優れていることがわかる。As is clear from this table, the magnetic properties of the plastic magnet according to Example 2 are superior to those using nylon as a binder.
実施例２に係るプラスチック磁石は次のように製造され
た。 （純度９
５％以上のＮｄ、電解鉄、フェロボロン ′を所定量
秤量しアルゴン雰囲気中高周波加熱によ Ｉり溶解し
て鋳込み、３１．１ｗｔ％Ｎｄ−６７，９ｗｔ％Ｆｅ−
１，Ｏｖｔ％Ｂなる組成の合金インボッ ６トを得た
。 ）次に、
このインゴットをアルゴン雰囲気中で高 プ周波加熱
により再溶解した後、周速度３５Ｍ／ｓｅｃで回転する
銅製のロール表面に噴射し、厚さ約３０μｍの合金薄帯
を得、３２メツシユ以下と ４なるまで粉砕し、磁性
粉末を得た。この粉末を実 ：雄側−１と同様の方法
でプラスチック磁石（試料 ／３）とし、実施例−１
と同様の試験を行い、第２４表、第２図に結果を示した
。The plastic magnet according to Example 2 was manufactured as follows. (Purity 9
Weighed a predetermined amount of 5% or more Nd, electrolytic iron, and ferroboron, melted and cast it by high-frequency heating in an argon atmosphere, and poured it into 31.1wt%Nd-67, 9wt%Fe-
An alloy ingot 6 having a composition of 1.Ovt%B was obtained. )next,
This ingot was remelted by high frequency heating in an argon atmosphere, and then sprayed onto the surface of a copper roll rotating at a circumferential speed of 35 M/sec to obtain an alloy ribbon with a thickness of approximately 30 μm and a thickness of 32 meshes or less. The powder was ground to obtain magnetic powder. This powder was used as a plastic magnet (sample/3) in the same manner as in Male side-1, and Example-1
A similar test was conducted, and the results are shown in Table 24 and Figure 2.
比較の為に実施例２に係るプラスチック磁石と ス同
様に調整したＮｄ−Ｆｅ−８合金粉末を実施例 雛１
の比較例と同様の方法でプラスチック磁石（試ｔ−１４
）とし、実施例−１と同様の試験を行い、第２表、第２
図に結果を示した。For comparison, the plastic magnet according to Example 2 and the Nd-Fe-8 alloy powder prepared in the same manner as in Example 1 were used.
A plastic magnet (trial T-14) was prepared in the same manner as the comparative example.
), the same test as in Example-1 was conducted, and Table 2,
The results are shown in the figure.
また特にＮｄ−Ｆｅ−Ｂ基磁性粉末を使用したしのでは
耐食性が非常に問題となるが、実施例−２、比較例で得
られた成形体を６５℃、９５％（Ｈという条件で恒温恒
温試験を施したところ５００Ｈｒで比較例−２では全面
に赤錆が発生したりに対し、実施例−２では外観にはま
ったく変化ｆなく、耐食性においても著しい改善が認め
られに。In addition, corrosion resistance is a serious problem especially when using Nd-Fe-B based magnetic powder, but the molded bodies obtained in Example 2 and Comparative Example were When a constant temperature test was conducted for 500 hours, red rust occurred on the entire surface in Comparative Example 2, whereas in Example 2, there was no change in appearance at all, and a significant improvement in corrosion resistance was observed.
［発明の効果］
以上詳しく説明したように、本発明によれば、トまでの
ナイロンを主流としたプラスチック磁石しりも、磁石特
性はもちろん耐熱性ともにすぐれごプラスチック磁石及
びその製造方法が提供でき５゜
また、本発明によれば耐食性が改善された希土ｎ系プラ
スチック磁石及びその製造方法が提供でさる。[Effects of the Invention] As explained in detail above, according to the present invention, it is possible to provide a plastic magnet and a method for manufacturing the same, which have excellent heat resistance as well as magnetic properties, even when plastic magnets are mainly made of nylon. Further, according to the present invention, a rare earth n-based plastic magnet with improved corrosion resistance and a method for manufacturing the same are provided.
このように、本発明はプラスチック磁石の信頼性向上に
寄与するところは非常に大であり、工業上極めて有益で
ある。As described above, the present invention greatly contributes to improving the reliability of plastic magnets, and is extremely useful industrially.
第１図は本発明の実施例１に係るプラスチック磁石の曲
げ強度半減期と温度との関係を示す図、第２図は本発明
の実施例２に係るプラスチック磁石の曲げ強度半減期と
温度との関係を示す図である。
第１図
成形体曲げ強度減期 （Ｈｒ）FIG. 1 is a diagram showing the relationship between the bending strength half-life and temperature of a plastic magnet according to Example 1 of the present invention, and FIG. 2 is a diagram showing the relationship between the bending strength half-life and temperature of a plastic magnet according to Example 2 of the present invention. FIG. Figure 1 Bending strength loss of molded product (Hr)
Claims (5)
よりなり、上記フッ素樹脂層は、上記磁性粒子を互いに
結合していることを特徴とするプラスチック磁石。1. A plastic magnet comprising magnetic particles and a fluororesin layer interposed between the magnetic particles, the fluororesin layer bonding the magnetic particles to each other.
よりなることを特徴とする第１の請求項記載のプラスチ
ック磁石。2. The plastic magnet according to claim 1, wherein the magnetic particles are made of a rare earth alloy or a rare earth cobalt alloy.
末に０〜５０ｖｏｌ％（０を含まず）のフッ素樹脂粉末
を混合する混合工程と、混合された粉末を圧縮成形し成
形体を得る成形工程と、 上記成形体を上記フッ素樹脂の融点前後の所定温度を保
持し炉中で焼成することを含む焼成工程とを有し、 上記焼成工程は、上記成形体に含有された上記フッ素樹
脂粉末を融着することを特徴とするプラスチック磁石の
製造方法。3. A mixing step of mixing 0 to 50 vol% (not including 0) of fluororesin powder to 50 to 100 vol% (not including 100) of magnetic powder, and a molding process in which the mixed powder is compression molded to obtain a molded body. and a firing step including firing the molded body in a furnace while maintaining a predetermined temperature around the melting point of the fluororesin, and the firing step includes firing the fluororesin powder contained in the molded body. A method for manufacturing a plastic magnet, which comprises fusing together.
を配向させることを特徴とする第３の請求項記載のプラ
スチック磁石の製造方法。4. 4. The method of manufacturing a plastic magnet according to claim 3, wherein the molding step is performed in a magnetic field to orient the magnetic powder.
小なることを特徴とする第４又は第５の請求項記載のプ
ラスチック磁石の製造方法。5. 5. The method of manufacturing a plastic magnet according to claim 4, wherein the average particle size of the fluororesin powder is smaller than that of the magnetic powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63079566A JPH01251702A (en) | 1988-03-31 | 1988-03-31 | Plastic magnet and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63079566A JPH01251702A (en) | 1988-03-31 | 1988-03-31 | Plastic magnet and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01251702A true JPH01251702A (en) | 1989-10-06 |
Family
ID=13693558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63079566A Pending JPH01251702A (en) | 1988-03-31 | 1988-03-31 | Plastic magnet and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01251702A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002287502A (en) * | 2001-03-23 | 2002-10-03 | Ricoh Co Ltd | Developing roller |
| JP2007220747A (en) * | 2006-02-14 | 2007-08-30 | Sumida Corporation | Composite magnetic sheet and method of manufacturing same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5754304A (en) * | 1980-09-19 | 1982-03-31 | Seiko Epson Corp | Manufacture of permanent magnet |
| JPS6271201A (en) * | 1985-09-25 | 1987-04-01 | Hitachi Metals Ltd | Bond magnet |
-
1988
- 1988-03-31 JP JP63079566A patent/JPH01251702A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5754304A (en) * | 1980-09-19 | 1982-03-31 | Seiko Epson Corp | Manufacture of permanent magnet |
| JPS6271201A (en) * | 1985-09-25 | 1987-04-01 | Hitachi Metals Ltd | Bond magnet |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002287502A (en) * | 2001-03-23 | 2002-10-03 | Ricoh Co Ltd | Developing roller |
| JP2007220747A (en) * | 2006-02-14 | 2007-08-30 | Sumida Corporation | Composite magnetic sheet and method of manufacturing same |
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