JPH04284601A - Rare earthe-iron-boron-based bonded magnet - Google Patents
Rare earthe-iron-boron-based bonded magnetInfo
- Publication number
- JPH04284601A JPH04284601A JP3074077A JP7407791A JPH04284601A JP H04284601 A JPH04284601 A JP H04284601A JP 3074077 A JP3074077 A JP 3074077A JP 7407791 A JP7407791 A JP 7407791A JP H04284601 A JPH04284601 A JP H04284601A
- Authority
- JP
- Japan
- Prior art keywords
- film
- resin
- bonded magnet
- magnet
- iron
- 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
- 229910052796 boron Inorganic materials 0.000 title claims description 12
- 239000000843 powder Substances 0.000 claims abstract description 30
- 229920005989 resin Polymers 0.000 claims abstract description 25
- 239000011347 resin Substances 0.000 claims abstract description 25
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 229920001187 thermosetting polymer Polymers 0.000 claims description 13
- 239000011230 binding agent Substances 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000010941 cobalt Substances 0.000 claims description 4
- 229910017052 cobalt Inorganic materials 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- ZDVYABSQRRRIOJ-UHFFFAOYSA-N boron;iron Chemical group [Fe]#B ZDVYABSQRRRIOJ-UHFFFAOYSA-N 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 15
- 230000007797 corrosion Effects 0.000 abstract description 15
- 239000003960 organic solvent Substances 0.000 abstract description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 abstract description 7
- 239000003822 epoxy resin Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 229920000647 polyepoxide Polymers 0.000 abstract description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 239000005011 phenolic resin Substances 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 abstract description 4
- 229920006337 unsaturated polyester resin Polymers 0.000 abstract description 4
- 239000006185 dispersion Substances 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 229920001568 phenolic resin Polymers 0.000 abstract description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 abstract description 2
- 239000008096 xylene Substances 0.000 abstract description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 abstract 1
- 239000004634 thermosetting polymer Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 21
- 239000011248 coating agent Substances 0.000 description 19
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 7
- 239000000956 alloy Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004070 electrodeposition Methods 0.000 description 4
- 238000007592 spray painting technique Methods 0.000 description 4
- 229920000178 Acrylic resin Polymers 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910020674 Co—B Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、表面に耐蝕性に優れた
被膜が形成された希土類−鉄−ホウ素系ボンド磁石に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rare earth-iron-boron bonded magnet having a coating having excellent corrosion resistance formed on its surface.
【０００２】0002
【従来技術】希土類−鉄−ホウ素系ボンド磁石は、希土
類−コバルト系、特にＳｍ−Ｃｏ系のボンド磁石のよう
に高価なＳｍしていない高性能磁石として開発され、一
般家電製品からコンピューター関連機器、自動車部品等
に使用され、その用途は拡大の一途にある。この中でも
、プラスチックをバインダーとして有するボンド磁石は
、特殊な加工を必要とせず、複雑な形状や長尺なラジア
ルリング形状とすることができる等の利点を有しており
、その用途の拡大が期待されている。しかしながら、希
土類−鉄−ホウ素系ボンド磁石は耐蝕性に劣るという欠
点を有しており、この欠点を解消するために、その磁石
表面に、スプレー塗装や電着塗装により有機被膜を形成
することが一般に行なわれている。[Prior Art] Rare earth-iron-boron bonded magnets have been developed as high-performance magnets that do not have expensive Sm like rare earth-cobalt bonded magnets, especially Sm-Co bonded magnets, and are used for general home appliances and computer-related products. It is used in automobile parts, etc., and its applications are continuing to expand. Among these, bonded magnets that have plastic as a binder have the advantage of not requiring special processing and can be made into complex shapes or long radial ring shapes, and their applications are expected to expand. has been done. However, rare earth-iron-boron bonded magnets have the disadvantage of poor corrosion resistance, and in order to overcome this disadvantage, it is necessary to form an organic coating on the magnet surface by spray painting or electrodeposition coating. It is commonly practiced.
【０００３】0003
【発明が解決しようとする課題】上記有機被膜の形成に
は、エポキシ樹脂、フェノール樹脂、不飽和ポリエステ
ル樹脂、アクリル樹脂等の熱硬化性樹脂が多く使用され
ており、一般に、スプレー塗装の場合には有機溶剤が使
用され、また電着塗装の場合には水系の溶剤が使用され
て上記の各種熱硬化性樹脂から成る有機被膜の形成が行
なわれている。しかしながら、有機溶剤を用いたスプレ
ー塗装においては、塗装後における有機溶剤の蒸発によ
って被膜にピンホールを生じ、この部分からボンド磁石
の腐食を生じ易いという欠点がある。また水系の溶剤を
用いての電着塗装の場合には、上記のようなピンホール
の発生はなく、満足し得る耐蝕性を有する被膜が形成さ
れるものの、塗装に際して、ボンド磁石１個１個につい
て電極が必要であり、極めてコスト高になるという欠点
がある。このために、経済的に有利なスプレー塗装によ
り、耐蝕性に優れた有機被膜を形成する方法が検討され
ており、例えば熱硬化性樹脂中にフッ素系樹脂の微粉末
やグラファイトの微粉末を添加することが提案されてい
るが、未だ十分に満足し得るような耐蝕性を有する有機
被膜が得られるに至っていない。従って本発明の目的は
、経済的に有利なスプレー塗装により形成可能な耐蝕性
に優れた有機被膜を表面に有する希土類−鉄−ホウ素系
ボンド磁石を提供することである。[Problems to be Solved by the Invention] Thermosetting resins such as epoxy resins, phenolic resins, unsaturated polyester resins, and acrylic resins are often used to form the above-mentioned organic coatings. In the case of electrodeposition coating, an organic solvent is used, and in the case of electrodeposition coating, an aqueous solvent is used to form an organic film made of the above-mentioned various thermosetting resins. However, spray coating using an organic solvent has the disadvantage that pinholes are formed in the coating due to evaporation of the organic solvent after coating, and the bonded magnet is likely to corrode from these areas. In addition, in the case of electrodeposition coating using a water-based solvent, pinholes as described above do not occur and a film with satisfactory corrosion resistance is formed, but when coating, each bonded magnet is The drawback is that electrodes are required for this method, and the cost is extremely high. For this purpose, methods of forming organic coatings with excellent corrosion resistance using economically advantageous spray painting are being considered. For example, fine powders of fluororesin or graphite are added to thermosetting resins. However, it has not yet been possible to obtain an organic film with sufficiently satisfactory corrosion resistance. Therefore, an object of the present invention is to provide a rare earth-iron-boron based bonded magnet having an organic coating with excellent corrosion resistance on its surface that can be formed by economically advantageous spray coating.
【０００４】0004
【課題を解決するための手段】本発明は、コーティング
用樹脂中に二硫化モリブデンの微粉末を添加することに
より耐蝕性に優れた有機被膜を形成することに成功した
ものである。即ち、本発明によれば、組成が原子比で希
土類元素８〜３０％、ホウ素３〜１５％、残部が実質的
に鉄とコバルトもしくは鉄から成る磁石粉と、熱硬化性
樹脂バインダーとから形成された希土類−鉄−ホウ素系
ボンド磁石において、該磁石表面に有機被膜が形成され
ており、且つ該有機被膜は、１０〜７０重量％の割合で
二硫化モリブデン粉末が被膜形成樹脂中に分散された分
散構造を有していることを特徴とするボンド磁石が提供
される。[Means for Solving the Problems] The present invention has succeeded in forming an organic film with excellent corrosion resistance by adding fine powder of molybdenum disulfide to a coating resin. That is, according to the present invention, it is formed from magnet powder having a composition of 8 to 30% rare earth elements, 3 to 15% boron, and the remainder substantially iron and cobalt or iron in atomic ratio, and a thermosetting resin binder. In the rare earth-iron-boron bonded magnet, an organic film is formed on the surface of the magnet, and the organic film is formed by dispersing molybdenum disulfide powder in a film-forming resin at a ratio of 10 to 70% by weight. Provided is a bonded magnet characterized by having a dispersed structure.
【０００５】本発明においては、ボンド磁石表面に形成
される有機被膜は、被膜形成樹脂をマトリックスとし、
その中に二硫化モリブデン粉末が分散されている構造を
有していることが顕著な特徴である。即ち、有機被膜中
に分散されている二硫化モリブデン粉末は、被膜の形成
のために使用された有機溶剤が当該被膜中から蒸発する
に際して、発生するピンホールを埋めるかあるいはそれ
を小さくするように作用し、これによって当該有機被膜
は優れた耐蝕性を示し、ボンド磁石の腐食が有効に抑制
されるのである。このような効果は、二硫化モリブデン
粉末を使用することによってのみ達成され、例えば後述
する実施例からも明らかな通り、グラファイト等の粉末
を使用した場合には達成されず、かかる効果は極めて予
想外なものである。In the present invention, the organic film formed on the surface of the bonded magnet uses a film-forming resin as a matrix, and
A distinctive feature is that it has a structure in which molybdenum disulfide powder is dispersed. That is, the molybdenum disulfide powder dispersed in the organic film fills or reduces the size of pinholes that occur when the organic solvent used to form the film evaporates from the film. As a result, the organic coating exhibits excellent corrosion resistance, and corrosion of the bonded magnet is effectively suppressed. Such an effect can only be achieved by using molybdenum disulfide powder, and cannot be achieved by using a powder such as graphite, for example, as is clear from the examples below, and such an effect is extremely unexpected. It is something.
【０００６】本発明において、上記二硫化モリブデン粉
末は、有機被膜中に１０〜７０重量％、特に２０〜４０
重量％の割合で分散されていることも重要であり、その
量が１０重量％よりも少ないと、ピンホールの抑制効果
が十分でなく、満足すべき耐蝕性が付与されない。また
７０重量％を越えると、用いる塗料の粘度が大きくなり
、均一な被膜を形成することが困難となる。また用いる
二硫化モリブデン粉末の粒径は、一般に０．０１〜２μ
ｍ の範囲にあることが好適である。In the present invention, the molybdenum disulfide powder is contained in the organic coating in an amount of 10 to 70% by weight, particularly 20 to 40% by weight.
It is also important that the amount is dispersed in a proportion of 10% by weight, and if the amount is less than 10% by weight, the effect of suppressing pinholes will not be sufficient and satisfactory corrosion resistance will not be imparted. Moreover, if it exceeds 70% by weight, the viscosity of the paint used will increase, making it difficult to form a uniform film. The particle size of the molybdenum disulfide powder used is generally 0.01 to 2μ.
It is preferable that it is in the range of m.
【０００７】また上記被膜を形成するための被膜形成用
樹脂としては、熱硬化性樹脂および熱可塑性樹脂の何れ
をも使用することができるが、磁石の加熱ないし加温時
における被膜の安定性の見地からは、熱硬化性樹脂を使
用することが好適である。かかる熱硬化性樹脂としては
種々のものを使用することができ、例えばエポキシ樹脂
、フェノール樹脂、不飽和ポリエステル樹脂、アクリル
系樹脂等の一般に被膜形成用として使用されているもの
を使用することができる。[0007] Furthermore, as the film-forming resin for forming the above-mentioned film, both thermosetting resins and thermoplastic resins can be used; From this point of view, it is preferred to use thermosetting resins. Various types of thermosetting resins can be used, including those commonly used for film formation, such as epoxy resins, phenolic resins, unsaturated polyester resins, and acrylic resins. .
【０００８】さらに上記有機被膜の厚みは、一般に５〜
５０μｍ の範囲にあることが好適である。膜厚が５μ
ｍ よりも薄いと十分な耐蝕性が発揮されず、５０μｍ
よりも厚い場合には均一な厚みとすることが困難とな
り、またボンド磁石の容量が低くなって磁気特性が低下
する傾向がある。[0008] Furthermore, the thickness of the organic coating is generally 5 to
Preferably, the thickness is in the range of 50 μm. Film thickness is 5μ
If it is thinner than 50 μm, sufficient corrosion resistance will not be exhibited;
If the bonded magnet is thicker than this, it becomes difficult to obtain a uniform thickness, and the capacitance of the bonded magnet tends to decrease, resulting in a decrease in magnetic properties.
【０００９】上述した有機被膜は、上記被膜形成樹脂及
び二硫化モリブデン粉末を、トルエン、キシレン、メチ
ルエチルケトン、ベンゼン等の有機溶剤に均一に分散さ
せた分散液を用いて、例えばスプレー塗装によってボン
ド磁石表面に塗布し、乾燥することによって容易に形成
される。この場合、被膜形成樹脂及び二硫化モリブデン
粉末の使用量は、形成される被膜中に前述した量で二硫
化モリブデン粉末が存在するような範囲とし、この限り
において、例えば有機溶剤の使用量は、任意であり、作
業性等を考慮して設定すればよい。またボンド磁石表面
への塗布は、スプレー塗装が最も経済的であり且つ効率
がよいが、ボンド磁石の形状等によっては、刷毛塗り、
バーコーター等を用いて行なうことも可能である。The above-mentioned organic coating is applied to the surface of the bonded magnet by, for example, spray painting using a dispersion in which the coating-forming resin and molybdenum disulfide powder are uniformly dispersed in an organic solvent such as toluene, xylene, methyl ethyl ketone, or benzene. It is easily formed by applying it to the surface and drying it. In this case, the amounts of the film-forming resin and molybdenum disulfide powder to be used are such that the molybdenum disulfide powder is present in the above-mentioned amounts in the film to be formed, and within this range, for example, the amount of the organic solvent to be used is This is optional and may be set in consideration of workability and the like. Also, spray painting is the most economical and efficient method for coating the surface of a bonded magnet, but depending on the shape of the bonded magnet, brush painting,
It is also possible to carry out using a bar coater or the like.
【００１０】本発明において、上述した有機被膜を形成
すべきボンド磁石は、希土類−鉄−ホウ素系の磁石粉末
と熱硬化性樹脂バインダーとから形成されたものであり
、このボンド磁石はそれ自体公知である。即ち、上記磁
石粉末は、原子比でネオジウム等の希土類元素８〜３０
％、ホウ素３〜１５％、残部が実質的に鉄とコバルトも
しくは鉄である組成を有している。例えば、Ｎｄ−Ｆｅ
−Ｃｏ−Ｂ系、Ｎｄ−Ｄｙ−Ｆｅ−Ｂ系、Ｎｄ−Ｆｅ−
Ｂ系等が知られている。上記ボンド磁石は、例えば液体
急冷法によって製造することができる。即ち、上記組成
の合金を高周波等の手段によって溶解し、溶湯を高速回
転する銅またはアルミ製のロールに吹き付けて急冷し、
厚さ数十ミクロンのリボンとする。このリボンを適当な
熱処理に付して、例えば平均結晶粒径をが３０００Å以
下とした後に、スタンプミル、ボールミル等による乾式
あるいは湿式粉砕に付することにより、ボンド磁石用粉
末とする。この粉末の粒径は、通常、３５メッシュ（Ｊ
ＩＳ）以下とする。この粉末を、熱硬化性樹脂バインダ
ーと混合してプレス成形を行ない、磁場中で着磁するこ
とによりボンド磁石が得られる。ここで使用する熱硬化
性樹脂としては、この種のバインダーとして使用されて
いるものは全て使用することができ、その一例としてエ
ポキシ樹脂、フェノール樹脂、不飽和ポリエステル樹脂
、アクリル樹脂等を例示することができる。これらは一
液性のものでもよいし、あるいは硬化剤、硬化触媒等を
含む混合系のものでもよい。この熱硬化性樹脂バインダ
ーは、通常、上記合金粉末当り ０．５〜４重量％の割
合で使用される。合金粉末と熱硬化性樹脂との混合は、
ブレンダーによる乾式混合によって行なうこともできる
が、一旦バインダーを有機溶媒に溶かした溶液中に合金
粉末を浸漬し、乾燥、塊砕する湿式法が好適である。上
記で得られた合金粉末とバインダーとの混合物を用いて
プレス成形及びバインダー樹脂の硬化を行ない、前述し
た有機被膜を形成した後、磁場中で着磁を行なってボン
ド磁石が得られる。[0010] In the present invention, the bonded magnet on which the above-mentioned organic film is to be formed is formed from rare earth-iron-boron based magnet powder and a thermosetting resin binder, and this bonded magnet is known per se. It is. That is, the magnet powder has an atomic ratio of 8 to 30 rare earth elements such as neodymium.
%, 3 to 15% boron, and the balance substantially iron and cobalt or iron. For example, Nd-Fe
-Co-B system, Nd-Dy-Fe-B system, Nd-Fe-
B series etc. are known. The bonded magnet described above can be manufactured, for example, by a liquid quenching method. That is, an alloy having the above composition is melted by means such as high frequency, and the molten metal is quenched by being sprayed onto high-speed rotating copper or aluminum rolls.
The ribbon is several tens of microns thick. This ribbon is subjected to a suitable heat treatment to, for example, have an average crystal grain size of 3000 Å or less, and then subjected to dry or wet pulverization using a stamp mill, ball mill, etc. to obtain powder for bonded magnets. The particle size of this powder is usually 35 mesh (J
IS) The following shall apply. This powder is mixed with a thermosetting resin binder, press-molded, and magnetized in a magnetic field to obtain a bonded magnet. As the thermosetting resin used here, all those used as this type of binder can be used, and examples thereof include epoxy resin, phenol resin, unsaturated polyester resin, acrylic resin, etc. Can be done. These may be one-component, or may be a mixed type containing a curing agent, curing catalyst, etc. This thermosetting resin binder is normally used in an amount of 0.5 to 4% by weight based on the alloy powder. The mixture of alloy powder and thermosetting resin is
Although this can be carried out by dry mixing using a blender, a wet method in which the alloy powder is immersed in a solution of a binder dissolved in an organic solvent, dried, and crushed is preferred. The mixture of the alloy powder and binder obtained above is press-molded and the binder resin is cured to form the above-mentioned organic coating, and then magnetized in a magnetic field to obtain a bonded magnet.
【００１１】[0011]
【実施例】原子％でＮｄ１２％、Ｃｏ８％、Ｂ５％及び
残部がＦｅから成る合金溶湯を、周速度２５ｍ／ｓｅｃ
で回転する銅ロール上に吹き付け、巾３ｍｍ、厚さ２
０μｍ のリボン状試料を得た。この試料をスタンプミ
ルで８０メッシュ篩（ＪＩＳ）下まで粉砕し、得られた
粉末に硬化剤を含むエポキシ樹脂（ビスフェノールＡ型
，二液性）を２重量％混合した。該混合物をプレス金型
中に供給し、成形面圧７ｔｏｎ／ｃｍ２ でプレス成形
し、外径２０ｍｍ×内径１６ｍｍ×高さ４ｍｍのリング
状試料を得た。次いで、この試料を大気中において１３
０℃×１時間熱処理し、該試料中のエポキシ樹脂を硬化
させた。次いで上記試料に、表１に示すような塗料を裏
表それぞれ１回ずつスプレー塗装し、１２０℃×２時間
乾燥を行なった。[Example] A molten alloy consisting of 12% Nd, 8% Co, 5% B and the balance Fe was heated at a circumferential speed of 25 m/sec.
Spray onto a rotating copper roll, width 3mm, thickness 2
A ribbon-like sample of 0 μm was obtained. This sample was pulverized using a stamp mill to a level below an 80 mesh sieve (JIS), and 2% by weight of an epoxy resin (bisphenol A type, two-component) containing a curing agent was mixed with the resulting powder. The mixture was supplied into a press mold and press-molded at a molding surface pressure of 7 ton/cm2 to obtain a ring-shaped sample with an outer diameter of 20 mm, an inner diameter of 16 mm, and a height of 4 mm. Next, this sample was placed in the atmosphere for 13 minutes.
Heat treatment was performed at 0° C. for 1 hour to harden the epoxy resin in the sample. Next, the above sample was spray-coated once on each of the front and back sides with the paint shown in Table 1, and dried at 120°C for 2 hours.
【００１２】0012
【００１３】上記表中、ＭＥＫはメチルエチルケトンを
示す。実施例等で使用した二硫化モリブデンの平均粒径
は ０．５μｍ である。また比較例３で用いたテフロ
ン樹脂は平均粒径 ０．２μｍ の粉末であり、比較例
４で用いたカーボングラファイトは平均粒径 ０．５μ
ｍ の粉末である。
試料（ボンド磁石）表面に形成された塗膜の厚みは、走
査型電子顕微鏡で測定した。上記の被膜が形成された試
料を８０℃，９０％ＲＨの恒温恒湿槽中に入れ、経時に
よる錆の発生具合を目視で評価した。その結果を表２に
示す。In the above table, MEK represents methyl ethyl ketone. The average particle size of molybdenum disulfide used in Examples and the like is 0.5 μm. The Teflon resin used in Comparative Example 3 was a powder with an average particle size of 0.2 μm, and the carbon graphite used in Comparative Example 4 had an average particle size of 0.5 μm.
m powder. The thickness of the coating film formed on the surface of the sample (bond magnet) was measured using a scanning electron microscope. The sample on which the above film was formed was placed in a constant temperature and humidity chamber at 80° C. and 90% RH, and the degree of rust generation over time was visually evaluated. The results are shown in Table 2.
【００１４】[0014]
【００１５】[0015]
【発明の効果】本発明によれば、経済的に極めて有利な
スプレー塗装により、耐蝕性に優れた被膜を希土類−鉄
−ホウ素系ボンド磁石表面に形成することができ、かか
る被膜が形成されたボンド磁石は、耐蝕性が要求される
電子機器等の分野において、特に有効に使用される。[Effects of the Invention] According to the present invention, a coating with excellent corrosion resistance can be formed on the surface of a rare earth-iron-boron bonded magnet by spray coating, which is extremely economically advantageous. Bonded magnets are particularly effectively used in fields such as electronic equipment that require corrosion resistance.
Claims (1)
ウ素３〜１５％、残部が実質的に鉄とコバルトもしくは
鉄から成る磁石粉と、熱硬化性樹脂バインダーとから形
成された希土類−鉄−ホウ素系ボンド磁石において、該
磁石表面に有機被膜が形成されており、且つ該有機被膜
は、１０〜７０重量％の割合で二硫化モリブデン粉末が
被膜形成樹脂中に分散された分散構造を有していること
を特徴とするボンド磁石。[Claim 1] A rare earth element formed from magnet powder whose atomic ratio is 8 to 30% rare earth elements, 3 to 15% boron, and the remainder essentially iron and cobalt or iron, and a thermosetting resin binder. - In an iron-boron bonded magnet, an organic film is formed on the surface of the magnet, and the organic film has a dispersed structure in which molybdenum disulfide powder is dispersed in a film-forming resin at a ratio of 10 to 70% by weight. A bonded magnet characterized by having.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3074077A JPH04284601A (en) | 1991-03-13 | 1991-03-13 | Rare earthe-iron-boron-based bonded magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3074077A JPH04284601A (en) | 1991-03-13 | 1991-03-13 | Rare earthe-iron-boron-based bonded magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04284601A true JPH04284601A (en) | 1992-10-09 |
Family
ID=13536749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3074077A Pending JPH04284601A (en) | 1991-03-13 | 1991-03-13 | Rare earthe-iron-boron-based bonded magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04284601A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000034963A1 (en) * | 1998-12-07 | 2000-06-15 | Sumitomo Metal Mining Co., Ltd. | Resin-bonded magnet |
| JP2009065027A (en) * | 2007-09-07 | 2009-03-26 | Daido Electronics Co Ltd | Integrated yoke type magnetic body |
-
1991
- 1991-03-13 JP JP3074077A patent/JPH04284601A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000034963A1 (en) * | 1998-12-07 | 2000-06-15 | Sumitomo Metal Mining Co., Ltd. | Resin-bonded magnet |
| US6641919B1 (en) * | 1998-12-07 | 2003-11-04 | Sumitomo Metal Mining Co., Ltd. | Resin-bonded magnet |
| JP2009065027A (en) * | 2007-09-07 | 2009-03-26 | Daido Electronics Co Ltd | Integrated yoke type magnetic body |
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