JP2001210505A - Rare earth bonded magnet of superior corrosion resistance and its manufacturing method - Google Patents
Rare earth bonded magnet of superior corrosion resistance and its manufacturing methodInfo
- Publication number
- JP2001210505A JP2001210505A JP2000013596A JP2000013596A JP2001210505A JP 2001210505 A JP2001210505 A JP 2001210505A JP 2000013596 A JP2000013596 A JP 2000013596A JP 2000013596 A JP2000013596 A JP 2000013596A JP 2001210505 A JP2001210505 A JP 2001210505A
- Authority
- JP
- Japan
- Prior art keywords
- rare earth
- bonded magnet
- earth bonded
- corrosion resistance
- solid lubricant
- 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
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)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、希土類磁石粉をバ
インダー樹脂で結合した磁石表面に防錆処理を施した、
耐食性に優れた希土類ボンド磁石及びその製造方法に関
する。BACKGROUND OF THE INVENTION The present invention relates to a magnet having a rare-earth magnet powder bonded with a binder resin, the surface of which is subjected to a rust-proof treatment.
The present invention relates to a rare earth bonded magnet excellent in corrosion resistance and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】この種の希土類ボンド磁石としては、特
許第２８７９６４５号公報に開示したものがある。この
希土類ボンド磁石は、希土類磁石粉末（Ｓｍ２Ｃ
ｏ１７，Ｎｄ ２Ｆｅ１４Ｂ，Ｓｍ２Ｆｅ１７Ｎｘ等）を
バインダー樹脂で結合（圧縮成型及び加熱）してなる磁
石表面に、バインダー樹脂と同種の樹脂と２〜７０ｗｔ
％（重量％）のフッソ樹脂からなる皮膜を形成してい
る。このとき、皮膜表面は撥水性を呈することを特徴と
する。また、前記バインダー樹脂はエポキシ、フェノー
ル、ポリエステル樹脂から選択される少なくとも１種類
以上である。このような構成により、耐食性及び耐侯性
に優れる希土類ボンド磁石を作製するようにしている。2. Description of the Related Art Rare-earth bonded magnets of this type include
There is one disclosed in Japanese Patent No. 2879645. this
The rare-earth bonded magnet is made of rare-earth magnet powder (Sm2C
o17, Nd 2Fe14B, Sm2Fe17Nx etc.)
Magnet formed by binding (compression molding and heating) with binder resin
On the stone surface, the same resin as the binder resin and 2-70wt
% (% By weight) of a fluorine resin
You. At this time, the film surface is characterized by exhibiting water repellency.
I do. The binder resin is epoxy, phenol,
At least one selected from polyester resin
That is all. With such a structure, corrosion resistance and weather resistance
Rare-earth bonded magnets with excellent characteristics are manufactured.
【０００３】[0003]
【発明が解決しようとする課題】上記したように、従来
から希土類磁石粉をバインダー樹脂で結合した希土類ボ
ンド磁石は、防錆処理として樹脂コーティングが広く採
用されてきた。なかでもエポキシ系塗料を使用したもの
は耐食性が高く、磁石素地に対する密着性も良いことか
ら優れた耐食性を示している。このため、希土類ボンド
磁石の防錆処理はほとんどエポキシコーティングが施さ
れている。As described above, a rare-earth bonded magnet in which a rare-earth magnet powder is bound with a binder resin has been widely used as a rust preventive treatment by resin coating. Among them, those using an epoxy-based paint have high corrosion resistance and good adhesion to a magnet base material, and thus exhibit excellent corrosion resistance. For this reason, rare-earth bonded magnets are almost always coated with an epoxy coating.
【０００４】通常樹脂コーティングを行う場合、被塗物
は治具に固定されるか或いは金網等に平置きされるが、
形状が小さくなるに従いこれらの作業を簡便に行うのが
困難となる。このため、被塗物が小物形状の場合、整列
作業が価格上昇の要因となっていた。[0004] Usually, when performing resin coating, the object to be coated is fixed on a jig or placed flat on a wire mesh or the like.
As the shape becomes smaller, it becomes more difficult to perform these operations simply. For this reason, when the object to be coated has a small object shape, the alignment work has caused a price increase.
【０００５】本発明は、上記の点に鑑み、防錆のための
皮膜構造及び形成法を工夫することで、被塗物の整列操
作を省略可能で、小物形状でも低コストで作製可能な耐
食性に優れた希土類ボンド磁石及びその製造方法を提供
することを目的とする。[0005] In view of the above, the present invention can omit the operation of arranging the objects to be coated by devising a film structure and a forming method for rust prevention, and can produce small-sized articles at low cost. It is an object of the present invention to provide a rare-earth bonded magnet excellent in resistance and a method for manufacturing the same.
【０００６】本発明のその他の目的や新規な特徴は後述
の実施の形態において明らかにする。[0006] Other objects and novel features of the present invention will be clarified in embodiments described later.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る耐食性に優れた希土類ボンド磁石は、
希土類磁石粉と結合樹脂からなる磁石において、最表面
に固体潤滑剤粒子を含むポリイミド又はポリアミドイミ
ド皮膜が膜厚５〜３０μｍ形成されていることを特徴と
している。In order to achieve the above object, a rare earth bonded magnet excellent in corrosion resistance according to the present invention is provided.
In a magnet made of a rare earth magnet powder and a binding resin, a polyimide or polyamideimide film containing solid lubricant particles is formed on the outermost surface to a thickness of 5 to 30 μm.
【０００８】前記耐食性に優れた希土類ボンド磁石にお
いて、前記固体潤滑剤粒子はフッソ樹脂、ＭｏＳ２又は
グラファイトのいずれか１種類以上であり、平均粒径が
０．１〜１０μｍであるとよい。[0008] In excellent rare-earth bonded magnet to the corrosion resistance, the solid lubricant particles is at fluororesin, either MoS 2 or graphite 1 or more, or when the average particle diameter is 0.1 to 10 [mu] m.
【０００９】前記固体潤滑剤粒子を含むポリイミド又は
ポリアミドイミド皮膜は、前記固体潤滑剤粒子が２〜５
０ｗｔ％の割合で添加されているとよい。[0009] The polyimide or polyamideimide film containing the solid lubricant particles, the solid lubricant particles are 2 to 5
It may be added at a ratio of 0 wt%.
【００１０】本発明に係る耐食性に優れた希土類ボンド
磁石の製造方法は、希土類磁石粉と結合樹脂からなる希
土類ボンド磁石を製造する場合において、最表面層とし
て固体潤滑剤粒子を含むポリイミド又はポリアミドイミ
ド皮膜を膜厚５〜３０μｍでスプレータンブラー法によ
り形成したことを特徴としている。The method for producing a rare earth bonded magnet excellent in corrosion resistance according to the present invention is a method for producing a rare earth bonded magnet comprising a rare earth magnet powder and a binder resin, comprising a polyimide or polyamideimide containing solid lubricant particles as the outermost surface layer. The film is formed by a spray tumbler method with a film thickness of 5 to 30 μm.
【００１１】[0011]
【発明の実施の形態】以下、本発明に係る耐食性に優れ
た希土類ボンド磁石及びその製造方法の実施の形態を図
面に従って説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the rare earth bonded magnet excellent in corrosion resistance and the method of manufacturing the same according to the present invention will be described below with reference to the drawings.
【００１２】図１及び図２は本発明の実施の形態であ
り、スプレータンブラー方式のコーティング装置を示
す。これらの図において、１は被塗物を内部に収容する
タンブラー（又はバレルとも言う）で、周囲が網状のか
ご構造であり、２はコーティング材料をミストにして吹
き付けるスプレーガンである。FIGS. 1 and 2 show an embodiment of the present invention, and show a spray tumbler type coating apparatus. In these figures, reference numeral 1 denotes a tumbler (also referred to as a barrel) for accommodating an object to be coated, which has a net-like cage structure, and reference numeral 2 denotes a spray gun for spraying a coating material as a mist.
【００１３】このようなコーティング装置のタンブラー
１に被塗物として小物形状の希土類ボンド磁石（希土類
磁石粉と結合樹脂からなる磁石素体）を収容し、図１の
ように回転中心Ｓでタンブラー１を回転させ、外部から
ヒーターで温めながらタンブラーに対向するように設置
されたスプレーガン２からコーティング材料としてのポ
リアミドイミド系塗料を使用してコーティングする。こ
のとき塗料中にはＰＴＦＥ（四フッ化エチレン樹脂）を
はじめとするフッソ樹脂、二硫化モリブデン（Ｍｏ
Ｓ２）、グラファイト等の固体潤滑剤粒子が少なくとも
１種以上含まれている。固体潤滑剤粒子は全樹脂量に対
し２〜５０ｗｔ％含まれており、その粒径は０．１〜１
０μｍである。希土類ボンド磁石表面に形成される皮膜
の厚さは５〜３０μｍである。A small-sized rare-earth bonded magnet (magnet body composed of rare-earth magnet powder and a binder resin) is accommodated in the tumbler 1 of such a coating apparatus as an object to be coated, and as shown in FIG. Is rotated and coated with a polyamideimide-based coating material as a coating material from a spray gun 2 installed so as to face the tumbler while being warmed by a heater from the outside. At this time, the coating material contains a fluorine resin such as PTFE (ethylene tetrafluoride resin) and molybdenum disulfide (Mo).
S 2 ) At least one kind of solid lubricant particles such as graphite is contained. The solid lubricant particles are contained in an amount of 2 to 50% by weight based on the total resin amount, and the particle size is 0.1 to 1%.
0 μm. The thickness of the film formed on the rare earth bonded magnet surface is 5 to 30 μm.
【００１４】タンブラー中に希土類ボンド磁石を投入し
て、タンブラーを回転させながらコーティングするため
一度に全面塗装が可能であり、ポリアミドイミドを塗料
のベース樹脂としているため被塗物同士の貼り付きが少
ない。そして、コーティングした希土類ボンド磁石を加
熱硬化して耐食性に優れた防錆皮膜を形成する。A rare-earth bonded magnet is put into a tumbler and coating is performed at a time because the coating is performed while rotating the tumbler, so that it is possible to apply the entire surface at one time. . Then, the coated rare earth bonded magnet is cured by heating to form a rust preventive film having excellent corrosion resistance.
【００１５】図３（Ａ）,（Ｂ）のように、スプレータ
ンブラー方式でコーティングする場合の被塗物としての
磁石素体３は円盤状、円柱状等であり、最大外形Ｌは２
０mm以下であることが望ましい。これは、２０mmを越え
ると、割れ、欠けが発生し易くなるからである。As shown in FIGS. 3A and 3B, the magnet body 3 as an object to be coated in the case of coating by the spray tumbler method has a disk shape, a column shape or the like, and the maximum outer shape L is 2
It is desirable that it is 0 mm or less. This is because if it exceeds 20 mm, cracking and chipping tend to occur.
【００１６】この実施の形態において、コーティング材
料としてポリアミドイミド系塗料を用いる理由は、エポ
キシ系、フェノール系及びポリエステル系塗料と比べて
ポリアミドイミド系塗料は乾燥が早いため（軟化点が高
いのでべたつき難い）、スプレータンブラー方式でコー
ティングを行った場合、被塗物同士が貼り付きにくいか
らである。また、磁石素地に対する密着性がよく優れた
耐食性を示す。耐熱性にも優れており、はんだリフロー
にも十分耐えうる皮膜である。In this embodiment, the reason for using a polyamideimide-based coating material as a coating material is that the polyamideimide-based coating material dries faster than an epoxy-based, phenol-based, or polyester-based coating material. This is because, when the coating is performed by the spray tumbler method, the objects to be coated are difficult to stick to each other. In addition, it has good adhesion to a magnet substrate and exhibits excellent corrosion resistance. It has excellent heat resistance and can withstand solder reflow.
【００１７】なお、従来一般的なエポキシ樹脂、フェノ
ール樹脂系塗料では、軟化点が低く低温でべたつき易く
（粘着力が強く）磁石同士が貼り付いてしまうため５〜
３０μｍの必要な塗膜を形成することが困難である（厚
膜処理が困難で薄膜処理となってしまう）。塗膜が薄膜
化すると耐食性が不十分となり、コーティング本来の目
的を達成することができない。In the case of conventional epoxy resin and phenolic resin paints, the magnets stick to each other because the softening point is low and the magnets stick easily at low temperatures (high adhesion).
It is difficult to form a required coating film of 30 μm (thick film processing is difficult, resulting in thin film processing). When the coating film becomes thin, the corrosion resistance becomes insufficient, and the original purpose of the coating cannot be achieved.
【００１８】また、コーティング皮膜を５〜３０μｍの
樹脂皮膜とする理由は、希土類ボンド磁石にスプレーコ
ーティングを行う場合、膜厚５μｍ未満では未塗装部分
が多く発生しやすく耐食性が大幅に低下するからであ
る。また、３０μｍを越えると小物形状の磁石では皮膜
表面での磁束密度低下が無視できない。The reason why the coating film is made of a resin film having a thickness of 5 to 30 μm is that when the rare earth bonded magnet is spray-coated, if the film thickness is less than 5 μm, many unpainted portions are likely to be generated and the corrosion resistance is greatly reduced. is there. On the other hand, when the thickness exceeds 30 μm, a decrease in the magnetic flux density on the surface of the coating cannot be ignored for a small-sized magnet.
【００１９】フッソ樹脂等の固体潤滑剤粒子を樹脂皮膜
に混入する理由は、塗料中のバインダー樹脂であるポリ
アミドイミドと接着性をもたないため、加熱硬化時に溶
剤が固体潤滑剤粒子とバインダー樹脂の界面を抜けるた
めピンホールが発生しにくいからである。固体潤滑剤粒
子は全樹脂量に対し２〜５０ｗｔ％の範囲とする。これ
は、２ｗｔ％未満では混入した効果が少なく、５０ｗｔ
％を越える程多量に含まれると塗膜の緻密さが失われ、
耐食性及び密着性が低下するからである。また、固体潤
滑剤粒子の粒径を０．１〜１０μｍとするのは、０．１
μｍ未満のものは実際上入手困難で取り扱いにも不便で
あり、また１０μｍを越えると被塗物に形成する皮膜の
厚さが５〜３０μｍであるのに対し、固体潤滑剤粒子の
粒径が大きすぎ、皮膜の平滑性が失われるためである。The reason for mixing solid lubricant particles such as fluororesin into the resin film is that the solvent does not have an adhesive property with polyamideimide as a binder resin in the coating material, and thus the solvent is mixed with the solid lubricant particles during heat curing. This is because pinholes are unlikely to be generated because they pass through the interface. The solid lubricant particles are in the range of 2 to 50% by weight based on the total resin amount. This is because when the content is less than 2 wt%, the mixed effect is small, and
%, The denseness of the coating film is lost when contained in a large amount,
This is because the corrosion resistance and the adhesion are reduced. Further, when the particle size of the solid lubricant particles is 0.1 to 10 μm,
Those having a particle size of less than μm are practically difficult to obtain and are inconvenient to handle, and those having a particle size of more than 10 μm have a thickness of 5 to 30 μm, whereas the solid lubricant particles have a particle size of 5 to 30 μm. This is because the film is too large and loses the smoothness of the film.
【００２０】スプレータンブラー方式で塗膜を形成する
理由は、小物製品のコーティング方式として、ディップ
スピン及びスプレータンブラー方式があり、前者は厚膜
化が困難であるのに対し、後者は厚膜化が可能であるた
めである。The reason for forming a coating film by the spray tumbler method is that there are dip spin and spray tumbler methods as coating methods for small products, and the former is difficult to increase the film thickness, while the latter is difficult to increase the film thickness. This is because it is possible.
【００２１】この実施の形態によれば、希土類磁石粉と
結合樹脂からなる希土類ボンド磁石の最表面層として、
固体潤滑剤粒子を含むポリアミドイミド皮膜を膜厚５〜
３０μｍでスプレータンブラー法により形成したので、
耐食性、耐熱性に優れた希土類ボンド磁石を得ることが
できる。また、小物形状でのバッチ処理と厚膜化が同時
に実現できるため、耐食性を維持しつつコストダウンが
可能となる。According to this embodiment, as the outermost surface layer of the rare earth bonded magnet composed of the rare earth magnet powder and the binding resin,
The polyamideimide film containing solid lubricant particles is
Since it was formed by the spray tumbler method at 30 μm,
A rare-earth bonded magnet excellent in corrosion resistance and heat resistance can be obtained. Further, since batch processing in a small object shape and thick film formation can be realized at the same time, it is possible to reduce costs while maintaining corrosion resistance.
【００２２】なお、上記実施の形態ではポリアミドイミ
ド系塗料で皮膜形成したが、ポリイミド系塗料で同様に
皮膜形成してもよい。但し、ポリイミドよりも前記ポリ
アミドイミドの方が吸湿性が少ない点で優れている。In the above embodiment, the film is formed with a polyamide-imide paint, but the film may be similarly formed with a polyimide paint. However, the polyamideimide is superior to the polyimide in that it has less hygroscopicity.
【００２３】[0023]
【実施例】次に本発明を実施例で詳述する。Next, the present invention will be described in detail with reference to examples.
【００２４】熱硬化性樹脂をバインダーとした直径７mm
×長さ１０mmの円柱形状の希土類ボンド磁石をバレル研
磨して、ＩＰＡ（イソプロパノール）に浸漬して洗浄
後、乾燥を行った。7 mm diameter using thermosetting resin as binder
A cylindrical rare earth bonded magnet having a length of 10 mm was barrel-polished, immersed in IPA (isopropanol), washed, and dried.
【００２５】これをスプレータンブラー法によりタンブ
ラーに投入し温風を当てながら、スプレーガン２からコ
ーティング材料としてのＰＴＦＥ（固体潤滑剤粒子）を
含むポリアミドイミド系塗料をミストにしてスプレー
し、厚さ５乃至３０μｍの樹脂皮膜を希土類ボンド磁石
最表面にコーティングした。This is put into a tumbler by a spray tumbler method, and while spraying hot air, a polyamide imide-based paint containing PTFE (solid lubricant particles) as a coating material is sprayed as a mist from a spray gun 2 to a thickness of 5 mm. A resin film of about 30 μm was coated on the outermost surface of the rare earth bonded magnet.
【００２６】また、比較例としてＰＴＦＥを含まないポ
リアミドイミド系塗料、及びエポキシ樹脂等が主成分の
塗料で同様にコーティングを行った。以下の表１にサン
プル作製条件を示す。As a comparative example, coating was similarly performed with a polyamide-imide-based paint containing no PTFE and a paint mainly composed of an epoxy resin or the like. Table 1 below shows the sample preparation conditions.
【００２７】[0027]
【表１】 [Table 1]
【００２８】表１において、実施例１，２，３はそれぞ
れＰＴＦＥを含むポリアミドイミド系塗料で５，１５，
３０μｍコーティングし、コーティング後１８０℃で１
時間加熱硬化させたものである。比較例１はＰＴＦＥを
含まないポリアミドイミド系塗料でコーティングしたも
ので、膜厚、加熱硬化条件は実施例２と同じである。比
較例２はＰＴＦＥを含まないエポキシ樹脂系塗料で１５
μｍコーティングし、コーティング後８０℃で４０分加
熱し、更に１５０℃で１時間加熱硬化させたものであ
る。比較例３はＰＴＦＥを含むエポキシ樹脂系塗料で１
５μｍコーティングし、コーティング後１５０℃で１時
間加熱硬化させたものである。比較例４はＰＴＦＥを含
まないフェノール樹脂系塗料で１５μｍコーティング
し、コーティング後１５０℃で１時間加熱硬化させたも
のである。In Table 1, Examples 1, 2, and 3 are polyamideimide paints containing PTFE, respectively.
30μm coating, after coating at 180 ℃ 1
It was cured by heating for hours. Comparative Example 1 was coated with a polyamideimide paint containing no PTFE, and the film thickness and the heat-curing conditions were the same as in Example 2. Comparative Example 2 was an epoxy resin-based paint containing no
After coating, the coating was heated at 80 ° C. for 40 minutes, and further heated and cured at 150 ° C. for 1 hour. Comparative Example 3 is an epoxy resin-based paint containing PTFE.
It was coated with 5 μm and cured by heating at 150 ° C. for 1 hour after coating. In Comparative Example 4, a phenol resin-based paint containing no PTFE was coated at a thickness of 15 μm, and after coating, heat-cured at 150 ° C. for 1 hour.
【００２９】上記実施例及び比較例のサンプルについ
て、スプレータンブラー法でコーティングを行ったとき
の被塗物同士の貼り付き、及び耐食性を評価した。耐食
性は８５℃、湿度８５％の条件下で１０００時間放置後
の外観変化及び塩水噴霧試験による錆の発生時間を調査
した。また、密着性試験は塗膜表面にカッターナイフで
切り込みを入れて、粘着テープで貼り付けて一気に剥離
し、塗膜が剥がれているかどうか確認した。The samples of the above Examples and Comparative Examples were evaluated for sticking between the objects to be coated and corrosion resistance when coating was performed by the spray tumbler method. The corrosion resistance was evaluated by examining the change in appearance after standing for 1000 hours under the conditions of 85 ° C. and 85% humidity and the rust generation time by a salt spray test. In addition, in the adhesion test, a cut was made on the surface of the coating film with a cutter knife, and the film was attached with an adhesive tape and peeled off at a stretch to check whether the coating film was peeled off.
【００３０】各サンプルについて、スプレータンブラー
法でコーティングしたときの被塗物の表面状態を調査し
た。結果を表２に示す。With respect to each sample, the surface condition of the substrate when coated by the spray tumbler method was examined. Table 2 shows the results.
【００３１】[0031]
【表２】 [Table 2]
【００３２】この表２の結果、実施例１乃至３の全てに
おいてコーティングの貼り付きなしであるのに対し、比
較例２乃至４はコーティング後の被塗物に貼り付きが発
生している。貼り付きがあると、後述するように、貼り
付き痕から発錆しやすくなる問題がある。As shown in Table 2, all of Examples 1 to 3 show no sticking of the coating, whereas Comparative Examples 2 to 4 show sticking of the coated object. If there is sticking, there is a problem that rust is easily generated from sticking marks as described later.
【００３３】また、各サンプルについて、８５℃、湿度
８５％の条件下で５００時間、１０００時間放置後の外
観変化及び密着性を調査した結果を、表３に示す。Table 3 shows the results of an investigation of the appearance change and adhesion after leaving the samples for 500 hours and 1000 hours under the conditions of 85 ° C. and 85% humidity.
【００３４】[0034]
【表３】 [Table 3]
【００３５】この表３の結果、実施例１乃至３の全てに
おいて１０００時間経過しても外観に変化がないのに対
し、比較例１乃至４では全てに点錆の発生が見られた。
密着性に関しては、実施例１乃至３の全てにおいて５０
０時間経過しても剥離無しであるのに対し、比較例２に
は剥離が見られ、また実施例２，３については、１００
０時間経過後も剥離無しであった。As a result of Table 3, in all of Examples 1 to 3, the appearance did not change even after 1000 hours, while in Comparative Examples 1 to 4, rust was observed in all of Examples.
Regarding the adhesion, 50 in all of Examples 1 to 3.
While no peeling was observed even after 0 hour, peeling was observed in Comparative Example 2, and in Examples 2 and 3, 100
There was no peeling even after 0 hour.
【００３６】さらに塩水噴霧試験後の噴霧時間と表面の
状態を表４に示す。Table 4 shows the spray time and surface condition after the salt spray test.
【００３７】[0037]
【表４】 [Table 4]
【００３８】この表４の結果、実施例１乃至３の全てに
おいて２４時間経過しても表面に変化がないのに対し、
比較例１乃至４では全てに点錆や全面赤錆の発生が見ら
れた。また、実施例２，３については、９６時間経過後
も錆の発生が見られなかった。As a result of Table 4, in all of Examples 1 to 3, the surface did not change even after 24 hours.
In Comparative Examples 1 to 4, spot rust and red rust were entirely observed. In Examples 2 and 3, no rust was observed even after 96 hours.
【００３９】以上の実施例と比較例との対比から明確な
ように、希土類ボンド磁石表面にスプレータンブラー方
式で、ＰＴＦＥを含むポリアミドイミド系塗料で皮膜形
成したものは耐食性に優れていることがわかる。また、
被塗物同士の貼り付きがないため被塗物を整列せずにバ
ッチ処理することが可能であり、コストダウンが可能で
ある。As is clear from the comparison between the above Examples and Comparative Examples, it is clear that the one in which a film is formed on the surface of the rare earth bonded magnet by a spray tumbler method with a polyamideimide paint containing PTFE has excellent corrosion resistance. . Also,
Since there is no sticking between objects to be coated, batch processing can be performed without aligning the objects to be coated, and cost can be reduced.
【００４０】また、コーティング前のボンド磁石素体
に、リン酸亜鉛、カップリング剤、プライマー等による
下地処理を施してから、前記スプレータンブラー法によ
るコーティングを施すとよい。It is preferable that the bonded magnet body before coating is subjected to a base treatment with zinc phosphate, a coupling agent, a primer and the like, and then coated by the spray tumbler method.
【００４１】以上本発明の実施の形態及び実施例につい
て説明してきたが、本発明はこれに限定されることなく
請求項の記載の範囲内において各種の変形、変更が可能
なことは当業者には自明であろう。Although the embodiments and examples of the present invention have been described above, it is to be understood by those skilled in the art that various modifications and changes can be made within the scope of the claims without limiting the present invention. Would be self-evident.
【００４２】[0042]
【発明の効果】以上説明したように、本発明によれば、
希土類磁石粉と結合樹脂からなる希土類ボンド磁石の最
表面に固体潤滑剤粒子を含むポリイミド又はポリアミド
イミド皮膜を膜厚５〜３０μｍ形成したことで、耐食性
に優れた希土類ボンド磁石を得ることができる。As described above, according to the present invention,
By forming a polyimide or polyamide imide film containing solid lubricant particles on the outermost surface of the rare earth bonded magnet composed of the rare earth magnet powder and the binding resin to a thickness of 5 to 30 μm, a rare earth bonded magnet excellent in corrosion resistance can be obtained.
【００４３】また、最表面層としての固体潤滑剤粒子を
含むポリイミド又はポリアミドイミド皮膜をスプレータ
ンブラー法により形成することで、被塗物同士の貼り付
きがないため被塗物を整列せずにバッチ処理することが
可能となり、製造容易とし、コストダウンを図ることが
できる。Further, by forming a polyimide or polyamideimide film containing solid lubricant particles as the outermost surface layer by a spray tumbler method, since the objects to be coated are not stuck to each other, the batch is formed without aligning the objects to be coated. Processing can be performed, manufacturing can be facilitated, and costs can be reduced.
【図１】本発明の実施の形態であって、スプレータンブ
ラー法によるコーティング工程を示す斜視図である。FIG. 1 is an embodiment of the present invention and is a perspective view showing a coating step by a spray tumbler method.
【図２】実施の形態で用いるコーティング装置のタンブ
ラーを示す正面図である。FIG. 2 is a front view showing a tumbler of the coating apparatus used in the embodiment.
【図３】被塗物としての希土類ボンド磁石の例を示す斜
視図である。FIG. 3 is a perspective view showing an example of a rare earth bonded magnet as an object to be coated.
１ タンブラー ２ スプレーガン ３ 磁石素体 1 Tumbler 2 Spray gun 3 Magnet element
Claims (4)
ボンド磁石において、最表面に固体潤滑剤粒子を含むポ
リイミド又はポリアミドイミド皮膜が膜厚５〜３０μｍ
形成されていることを特徴とする耐食性に優れた希土類
ボンド磁石。1. A rare earth bonded magnet comprising a rare earth magnet powder and a binder resin, wherein a polyimide or polyamide imide film containing solid lubricant particles is formed on the outermost surface with a film thickness of 5 to 30 μm.
Rare earth bonded magnet with excellent corrosion resistance characterized by being formed.
Ｓ２又はグラファイトのいずれか１種類以上であり、平
均粒径が０．１〜１０μｍであることを特徴とする請求
項１記載の耐食性に優れた希土類ボンド磁石。2. The solid lubricant particles comprise a fluorine resin, Mo
S is 2 or any one or more of graphite, rare earth bonded magnet excellent in corrosion resistance according to claim 1, wherein the average particle size of 0.1 to 10 [mu] m.
はポリアミドイミド皮膜は、前記固体潤滑剤粒子が２〜
５０ｗｔ％の割合で添加されていることを特徴とする請
求項１又は２記載の耐食性に優れた希土類ボンド磁石。3. The polyimide or polyamide-imide film containing the solid lubricant particles, wherein the solid lubricant particles are 2 to 3.
The rare-earth bonded magnet excellent in corrosion resistance according to claim 1 or 2, wherein the rare-earth bonded magnet is added at a ratio of 50 wt%.
ボンド磁石の製造方法において、最表面層として固体潤
滑剤粒子を含むポリイミド又はポリアミドイミド皮膜を
膜厚５〜３０μｍでスプレータンブラー法により形成し
たことを特徴とする耐食性に優れた希土類ボンド磁石の
製造方法。4. A method for producing a rare earth bonded magnet comprising a rare earth magnet powder and a binding resin, wherein a polyimide or polyamideimide film containing solid lubricant particles is formed as a top layer with a thickness of 5 to 30 μm by a spray tumbler method. A method for producing a rare earth bonded magnet having excellent corrosion resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000013596A JP2001210505A (en) | 2000-01-24 | 2000-01-24 | Rare earth bonded magnet of superior corrosion resistance and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000013596A JP2001210505A (en) | 2000-01-24 | 2000-01-24 | Rare earth bonded magnet of superior corrosion resistance and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001210505A true JP2001210505A (en) | 2001-08-03 |
Family
ID=18541161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000013596A Pending JP2001210505A (en) | 2000-01-24 | 2000-01-24 | Rare earth bonded magnet of superior corrosion resistance and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001210505A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006156789A (en) * | 2004-11-30 | 2006-06-15 | Tdk Corp | Process for producing small ring magnet |
| JP2007109898A (en) * | 2005-10-14 | 2007-04-26 | Daido Electronics Co Ltd | Bonded magnet and its manufacturing method |
| EP1818955A1 (en) * | 2004-11-30 | 2007-08-15 | Aichi Steel Corporation | Permanent magnet for motor, motor housing and motor device |
| JP4611432B1 (en) * | 2009-07-06 | 2011-01-12 | 株式会社仲田コーティング | Tumbler coating apparatus and tumbler coating method |
| JP2014232777A (en) * | 2013-05-28 | 2014-12-11 | 日本電産サンキョー株式会社 | Rare-earth magnet, rotor, and manufacturing method of rare-earth magnet |
| CN105390264A (en) * | 2014-08-25 | 2016-03-09 | 丰田自动车株式会社 | Manufacturing method of rare-earth magnet |
| JP2016204532A (en) * | 2015-04-23 | 2016-12-08 | 住鉱潤滑剤株式会社 | Polyamideimide coating composition and method for coating the same, and polyamideimide coating film |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04335501A (en) * | 1991-05-11 | 1992-11-24 | Sumitomo Special Metals Co Ltd | Permanent magnet excellent in corrosion resistance |
| JPH08199116A (en) * | 1995-01-26 | 1996-08-06 | Shikoku Chem Corp | Resin composition for coating |
-
2000
- 2000-01-24 JP JP2000013596A patent/JP2001210505A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04335501A (en) * | 1991-05-11 | 1992-11-24 | Sumitomo Special Metals Co Ltd | Permanent magnet excellent in corrosion resistance |
| JPH08199116A (en) * | 1995-01-26 | 1996-08-06 | Shikoku Chem Corp | Resin composition for coating |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006156789A (en) * | 2004-11-30 | 2006-06-15 | Tdk Corp | Process for producing small ring magnet |
| EP1818955A1 (en) * | 2004-11-30 | 2007-08-15 | Aichi Steel Corporation | Permanent magnet for motor, motor housing and motor device |
| EP1818955A4 (en) * | 2004-11-30 | 2009-12-23 | Aichi Steel Corp | Permanent magnet for motor, motor housing and motor device |
| US7812484B2 (en) | 2004-11-30 | 2010-10-12 | Aichi Steel Corporation | Permanent magnet for motor, motor housing, and motor device |
| JP2007109898A (en) * | 2005-10-14 | 2007-04-26 | Daido Electronics Co Ltd | Bonded magnet and its manufacturing method |
| JP4611432B1 (en) * | 2009-07-06 | 2011-01-12 | 株式会社仲田コーティング | Tumbler coating apparatus and tumbler coating method |
| JP2011011177A (en) * | 2009-07-06 | 2011-01-20 | Nakata Coating Co Ltd | Tumbler coating apparatus and tumbler coating method |
| JP2014232777A (en) * | 2013-05-28 | 2014-12-11 | 日本電産サンキョー株式会社 | Rare-earth magnet, rotor, and manufacturing method of rare-earth magnet |
| CN105390264A (en) * | 2014-08-25 | 2016-03-09 | 丰田自动车株式会社 | Manufacturing method of rare-earth magnet |
| JP2016204532A (en) * | 2015-04-23 | 2016-12-08 | 住鉱潤滑剤株式会社 | Polyamideimide coating composition and method for coating the same, and polyamideimide coating film |
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