JPH02254708A - Manufacture of resin-bonded magnet - Google Patents
Manufacture of resin-bonded magnetInfo
- Publication number
- JPH02254708A JPH02254708A JP7610289A JP7610289A JPH02254708A JP H02254708 A JPH02254708 A JP H02254708A JP 7610289 A JP7610289 A JP 7610289A JP 7610289 A JP7610289 A JP 7610289A JP H02254708 A JPH02254708 A JP H02254708A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- magnetic powder
- kneading
- bonded magnet
- film
- 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 8
- 239000006247 magnetic powder Substances 0.000 claims description 23
- 229920005989 resin Polymers 0.000 claims description 22
- 239000011347 resin Substances 0.000 claims description 22
- 238000004898 kneading Methods 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000007747 plating Methods 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 238000011282 treatment Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 1
- 229920006345 thermoplastic polyamide Polymers 0.000 description 1
- 229920001187 thermosetting polymer 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
- 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
- H01F1/083—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 in a bonding agent
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 【産業上の利用分野Ｊ 本発明は樹脂結合型磁石の製造方法に関する。[Detailed description of the invention] [Industrial Application Field J The present invention relates to a method for manufacturing a resin-bonded magnet.
希土類磁石、特に希土類−鉄−ボロン系磁石は酸化され
易く、そのためこの磁石の使用中に鎖が発生するという
問題点を有している。この問題点を解決するために従来
、成形された磁石に樹脂をコーティングする方法や磁性
粉末に金属メッキを施したり、セラミックや樹脂をコー
ティングする方法が試みられている。Rare earth magnets, especially rare earth-iron-boron based magnets, are easily oxidized and therefore have the problem of forming chains during use of the magnets. In order to solve this problem, attempts have been made in the past to coat molded magnets with resin, to plate magnetic powder with metal, or to coat ceramic or resin.
［発明が解決しようとする課題１
しかしながら、従来の技術では以下のような問題を有す
る。[Problem to be Solved by the Invention 1] However, the conventional technology has the following problems.
成形された磁石にコーティングするという前者の方法は
成形中の磁性粉末の酸化に対して効果を有さない、すな
わち、射出成形や押出成形を行なう場合、磁性粉末と樹
脂との混練中や成形中に磁性粉末が高温下にさらされる
ことになり、この時に磁性粉末が酸化し、成形ができな
くなったり、磁気性能が劣化するということが起こる。The former method of coating a molded magnet has no effect on the oxidation of the magnetic powder during molding. The magnetic powder is exposed to high temperatures, and at this time the magnetic powder becomes oxidized, making it impossible to mold or deteriorating its magnetic performance.
また。Also.
成形後のコーテイング膜に僅かな空孔でもあれば、そこ
から磁石内部が酸化されるという問題が生じる。これら
の問題点から考えると磁性粉末に被覆するという後者の
方法のほうが上記のような問題点を解決できる方法であ
る。しかし、後者の方法にも問題点がある。磁性粉末の
平均粒径は数十ミクロン程度であり、これに膜をつける
とするとその膜厚は１ミクロン以下ということになり、
したがって、非常に強固で密着性の強い膜をつけなけら
ばならないかもしくは被覆した膜が取れないような製造
工程を確立しなければならないという問題点がある。If there are even a few holes in the coating film after molding, a problem arises in that the inside of the magnet is oxidized from there. Considering these problems, the latter method of coating magnetic powder is a method that can solve the above problems. However, the latter method also has problems. The average particle size of magnetic powder is about several tens of microns, and if a film is applied to it, the thickness of the film will be less than 1 micron.
Therefore, there is a problem in that either a very strong and adhesive film must be applied, or a manufacturing process must be established so that the coated film cannot be removed.
そこで本発明はこのような問題点を解決するもので、そ
の目的とするところは耐酸化性、耐候性に優れた磁石を
提供するところにある。The present invention is intended to solve these problems, and its purpose is to provide a magnet with excellent oxidation resistance and weather resistance.
［課題を解決するための手段１
本発明の樹脂結合型磁石の製造方法は表面が金属メッキ
、セラミックで被覆されている磁性粉末と樹脂とを混練
してコンパウンドを作製するときに磁性粉末と樹脂の混
合物を加熱してその粘度ηがη ≦３００［ｋｐｏｉｓ
ｅｌ （ｓｈｅａｒ ｒａｔｅ １０００）となる
状態とした後に混練機に投入してコンパウンドを作製す
ることを特徴とする。[Means for Solving the Problems 1] The method for producing a resin-bonded magnet of the present invention involves kneading magnetic powder and resin whose surfaces are coated with metal plating or ceramic to produce a compound. is heated so that its viscosity η becomes η ≦300
el (shear rate 1000), and then put into a kneading machine to produce a compound.
すなわち、磁性粉末と樹脂の混合物が粘性をもち、その
粘度が３００ ｋｐｏｉｓｅ （ｓｈｅａｒ ｒａｔｅ
４１０００１以下の状態のとき、溶融状態の樹脂が磁性
粉末表面に吸着し、これが機械的応力を緩和して、ｒｉ
ｒｉ性粉末表面の被覆膜を保護することが可能となる。In other words, the mixture of magnetic powder and resin has viscosity, and the viscosity is 300 kpoise (shear rate).
410001 or less, the molten resin adsorbs to the surface of the magnetic powder, which relieves the mechanical stress and increases the ri
It becomes possible to protect the coating film on the surface of the RI powder.
［実 施 例Ｊ 以下、実施例にしたがりで、発明の詳細な説明する。[Implementation example J Hereinafter, the invention will be described in detail based on examples.
Ｎｄ１Ｊｅ□Ｂｉからなる組成の合金なルツボ中で溶解
しメルトスパン法で急冷し薄片を作製する。この薄片を
平均粒径３５μｍまで粉砕した後に第−表に示された処
理が施された。It is melted in an alloy crucible having a composition of Nd1Je□Bi and rapidly cooled by a melt span method to produce a thin piece. After the flakes were ground to an average particle size of 35 μm, they were subjected to the treatments shown in Table 1.
処理ｌは粉砕後、次亜リン酸ナトリウム還元アンモニア
アルカリ性コバルトメッキ浴でコバルト−リンメッキを
行い更に重クロム酸カリウム液にこの磁性粉末を入れて
クロメート処理を行いコバルトメッキ層を生成させた。In treatment 1, after pulverization, cobalt-phosphorous plating was performed in a sodium hypophosphite reduced ammonia alkaline cobalt plating bath, and the magnetic powder was then placed in a potassium dichromate solution for chromate treatment to form a cobalt plating layer.
処理２はテトラメトキシシランに塩酸でｐ）（を調整し
た純水をモル比が約１＝４となるようにして混合し、こ
れにエタノールを加えて加水分解する０分解後、表面活
性剤を加えた後に磁性粉末をいれて所定時間攪はんする
。その後、溶液と分離して磁性粉末を乾燥。Treatment 2 is to mix pure water prepared with tetramethoxysilane and hydrochloric acid so that the molar ratio is about 1=4, and add ethanol to the mixture for hydrolysis.After decomposition, the surfactant is added. After adding the magnetic powder, stir for a specified period of time.Then, separate from the solution and dry the magnetic powder.
熱処理してＳｔｏｗ膜を作製した。A Stow film was produced by heat treatment.
表面処理した後に磁性粉末６０ｖｏ １％、樹脂が４０
ｖｏ１％となるように秤量し、混合した後に混練機に投
入して混練をおこないコンパウンドを作製した。この時
混練機にはコールミルを使用した。また、ここで使用し
た樹脂は２種類の樹脂を使用し、そのうちのひとつ樹脂
０は熱硬化性のエポキシ樹脂を主体とする共重合体であ
り、もう一つの樹脂すは熱可塑性のポリアミド樹脂（ナ
イロン１２）であった０作製されたコンパウンドは粉砕
された後、射出成形機もしくは押出成形機で成形された
。樹脂すを使用した場合には成形後、成形体を加熱して
樹脂を硬化させた。After surface treatment, magnetic powder 60vo 1%, resin 40
The mixture was weighed so as to have a volume of 1%, mixed, and then put into a kneader and kneaded to prepare a compound. At this time, a coal mill was used as a kneader. In addition, two types of resins were used here, one of which, Resin 0, is a copolymer mainly composed of thermosetting epoxy resin, and the other resin is thermoplastic polyamide resin ( The prepared compound, which was nylon 12), was crushed and then molded in an injection molding machine or an extrusion molding machine. When a resin was used, after molding, the molded body was heated to harden the resin.
まず始めに磁石の成形工程中のどこで膜が剥がれ易いの
かを各工程前後での被覆率を一連の各工程ごとに試料な
さい取し、その被覆率を測定した。ここで使用した磁性
粉はメッキ厚さ１μｍのメッキ処理したものを使用し、
成形は押出成形機でおこなった。この結果を第三表に示
す。First, in order to determine where during the magnet molding process the film is likely to peel off, samples were taken before and after each step and the coverage was measured. The magnetic powder used here was plated with a plating thickness of 1 μm,
Molding was performed using an extrusion molding machine. The results are shown in Table 3.
第三表
この結果は樹脂ａ、ｂどちらを使用した場合でも同様で
あった。第三表より混練前後で膜の被覆率が急激に低下
しているのがわかる。その他の工程において、被覆率の
低下はわずかであり、これは特に、混練後では混合され
た樹脂が、コーテイング膜を保護するためであると考え
られる。−方、混練前は、固体の樹脂と磁性粉末が混合
されているだけであり、樹脂がコーテイング膜を保護す
るにいたっていないため、混練の際に、磁性粉末に強い
応力がかかり、コーテイング膜がはがされるのである。Table 3: The results were the same regardless of whether resins a or b were used. From Table 3, it can be seen that the film coverage rapidly decreases before and after kneading. In other steps, the coverage rate decreased only slightly, and this is thought to be because the mixed resin protects the coating film, especially after kneading. -On the other hand, before kneading, the solid resin and magnetic powder are just mixed, and the resin has not yet protected the coating film. Therefore, during kneading, strong stress is applied to the magnetic powder, causing the coating film to is torn off.
そこで、混練をおこなう前に磁性粉末と樹脂の混合物を
加熱し、その後、混練をおこなった１種々の温度に加熱
した後に混練したときの２１！締後の被覆率を第三表に
示す、ここで使用した磁性粉末は試料１〜６メッキ厚さ
Ｉｇｍのメッキ処理をしたものであり、試料７以降はＳ
ｉｎ、コーティングしたものである。樹脂は樹脂ａを使
用した。混練後の被覆率は混練前（混合後）の被覆率を
１００として、計算をおこない、粘度は、その濃度に加
熱したときの混合物のシェアレート１０００粘度である
。Therefore, the mixture of magnetic powder and resin was heated before kneading, and then heated to various temperatures before kneading, and then kneaded. The coverage after tightening is shown in Table 3. The magnetic powder used here was plated with a plating thickness of Igm for samples 1 to 6, and samples 7 and later were S.
in, coated. Resin a was used as the resin. The coverage after kneading is calculated by setting the coverage before kneading (after mixing) to 100, and the viscosity is the shear rate 1000 viscosity of the mixture when heated to that concentration.
第三表
第三表より、混合物を加熱することによって、粘性をも
つようにある。この粘性をもった状態に加熱した後に、
混練することによって、被覆率が向上していることは明
らかである。メッキしたものは５ｉｎｓコーテイングし
たものに比べ、膜の密着性が弱いため、被覆率は同じ条
件でも悪くはなっているが、はぼ ３００ ｋｐｏｉｓ
ｅ になったところでは被覆率の改善がみもれ、それ
以上のときには、十分にコーテイング膜はまもられてい
る。このような結果が得られたのは、混練中での膜のは
がれは、混練機に投入されたとき、まだ十分な加熱がな
されていない状態で、ロールの応力がかかるという影響
が大きいためであり、これは混合物に粘性を持たせるこ
とによって、この影響が緩和された結果であると思われ
る。Table 3 According to Table 3, heating the mixture makes it viscous. After heating to this viscous state,
It is clear that the coverage is improved by kneading. The plated one has weaker adhesion than the 5ins coated one, so the coverage is worse even under the same conditions, but it is about 300 kpois.
When the coating rate reaches e, an improvement in coverage can be seen, and when the coating rate is above that level, the coating film is sufficiently protected. This result was obtained because the peeling of the film during kneading is largely affected by the stress of the rolls, which are not yet sufficiently heated when fed into the kneader. This is thought to be the result of this effect being alleviated by making the mixture viscous.
次に、本発明の製造方法をもちいて製造した磁石の耐酸
化性を調べた。この結果を第四表に示す。Next, the oxidation resistance of the magnet manufactured using the manufacturing method of the present invention was examined. The results are shown in Table 4.
第四表
比較例は、混練前に加熱せずに混練したものであり、実
施例は １００ ｋｐｏｉｓｅ に加熱したのち混練
を行なった。耐酸化試験は、恒温恒湿槽で８０・Ｃ×９
５％で１００時間放置したときの結果である。混練前に
加熱処理することによって、耐酸化性が向上することは
あきらかである。The comparative examples in Table 4 were kneaded without heating before kneading, and the examples were kneaded after heating to 100 kpoise. The oxidation resistance test was conducted at 80°C x 9 in a constant temperature and humidity chamber.
These are the results when left at 5% for 100 hours. It is clear that oxidation resistance is improved by heat treatment before kneading.
［発明の効果１
以上述べたように発明によれば、混練する前ｉ、こ磁性
粉末と樹脂との混合物をその粘度が ３００ｋｐｏｉｓ
ｅ 以下になるように加熱した後に、混練することに
より、磁性粉末表面に被覆された膜がはがされることを
防ぎ、成形された磁石の耐酸化性を向上させるという効
果を有する。[Effect of the invention 1 As described above, according to the invention, the mixture of magnetic powder and resin has a viscosity of 300 kpois before kneading.
By kneading after heating to a temperature below e, the film coated on the surface of the magnetic powder is prevented from being peeled off, and the oxidation resistance of the molded magnet is improved.
以 上Below Up
Claims (2)
樹脂とを混練してコンパウンドを作製するときに磁性粉
末と樹脂の混合物を加熱してその粘度ηが η≦３００［ｋｐｏｉｓｅ］（ｓｈｅａｒ ｒａｔｅ
１０００）となる状態とした後に混練機に投入してコン
パウンドを作製することを特徴とする樹脂結合型磁石の
製造方法。(1) In the method for manufacturing a resin-bonded magnet, when a compound is produced by kneading magnetic powder and resin, the mixture of magnetic powder and resin is heated so that the viscosity η is η≦300 [kpoise] (shear rate).
1000) and then charging the compound into a kneader to produce a compound.
クが被覆されている粉末であることを特徴とする請求項
１記載の樹脂結合型磁石の製造方法。(2) The method for manufacturing a resin-bonded magnet according to claim 1, wherein the magnetic powder is a powder whose surface is coated with metal plating or ceramic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7610289A JPH02254708A (en) | 1989-03-28 | 1989-03-28 | Manufacture of resin-bonded magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7610289A JPH02254708A (en) | 1989-03-28 | 1989-03-28 | Manufacture of resin-bonded magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02254708A true JPH02254708A (en) | 1990-10-15 |
Family
ID=13595513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7610289A Pending JPH02254708A (en) | 1989-03-28 | 1989-03-28 | Manufacture of resin-bonded magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02254708A (en) |
-
1989
- 1989-03-28 JP JP7610289A patent/JPH02254708A/en active Pending
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