JPH06120014A - Surface treatment of rare earth-obalt magnet alloy - Google Patents
Surface treatment of rare earth-obalt magnet alloyInfo
- Publication number
- JPH06120014A JPH06120014A JP4265745A JP26574592A JPH06120014A JP H06120014 A JPH06120014 A JP H06120014A JP 4265745 A JP4265745 A JP 4265745A JP 26574592 A JP26574592 A JP 26574592A JP H06120014 A JPH06120014 A JP H06120014A
- Authority
- JP
- Japan
- Prior art keywords
- rare earth
- magnet alloy
- alloy
- surface treatment
- earth cobalt
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，希土類コバルト系磁石
合金の表面処理方法に関し，特に該表面処理を行うこと
により希土類コバルト系磁石合金のみかけ上の強度（じ
ん性）を改善する技術分野に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment method for rare earth cobalt-based magnet alloys, and more particularly to a technical field for improving the apparent strength (toughness) of rare earth cobalt magnet alloys by the surface treatment. It is a thing.
【０００２】[0002]
【従来の技術】一般に，希土類コバルト系永久磁石合金
の研削加工上りの製品は，硬くて脆いため，この製品を
取扱う際，この製品同志をぶつけたりして，ワレ，カケ
等の欠陥を生じやすい。そこで，この希土類コバルト系
磁石合金の研削加工上りの製品に，ニッケルメッキ等の
表面処理を行い，この製品同志が衝突した場合において
も，ニッケルメッキ層が，緩衝層として作用し，ワレ，
カケ等の発生を防ぐ方法や，該研削加工上りの製品に，
振動バレル，回転バレル，遊星バレル等のバレル研磨を
施し，該製品の表面層及び角部を滑らかにすることによ
り，該製品同志の衝突の際の衝突の応力集中を緩和する
ことにより，ワレ，カケ等の発生を防ぐ方法等がある。2. Description of the Related Art Generally, a product manufactured by grinding a rare earth cobalt-based permanent magnet alloy is hard and brittle, and therefore, when handling this product, it is easy to cause defects such as cracks and chips by hitting the product with each other. . Therefore, the finished product of this rare earth cobalt-based magnet alloy is subjected to surface treatment such as nickel plating, and even when the products collide with each other, the nickel plating layer acts as a buffer layer, causing cracks,
To prevent the generation of chips, etc.
By vibrating barrels, rotating barrels, planetary barrels and other barrel polishing to smooth the surface layer and corners of the product, the stress concentration at the time of collision between the products can be mitigated. There are methods to prevent the occurrence of chips and the like.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら，希土類
コバルト系磁石合金のニッケルメッキによる表面処理は
処理費用が高いという点が欠点であり，バレル研磨によ
る表面処理は，この研削加工上りの製品の表面に微小
な，き裂欠陥が残存しているので，ワレ，カケ等の発生
する確率が単に減少しているにすぎず，信頼性が低いワ
レ，カケ防止表面処理方法である点が欠点である。However, the surface treatment of rare earth cobalt based magnet alloys by nickel plating is disadvantageous in that the treatment cost is high, and the surface treatment by barrel polishing is applied to the surface of the product after the grinding process. Since minute crack defects remain, the probability that cracks and chips will occur is simply reduced, and the surface treatment method for cracks and chips with low reliability is a drawback.
【０００４】そこで，本発明の技術的課題は，これらの
欠点を除去するため研削加工された希土類コバルト系永
久磁石合金の該被削面の表面層を酸化させる表面処理を
施したもので，ワレ，カケの発生が少なく且つ処理費用
が安価な，希土類コバルト系磁石合金の表面処理方法を
提供することにある。Therefore, the technical problem of the present invention is that a surface treatment for oxidizing the surface layer of the abraded surface of the rare earth cobalt-based permanent magnet alloy ground to remove these defects is performed. It is an object of the present invention to provide a surface treatment method for rare earth cobalt-based magnet alloys which is less likely to cause chipping and is inexpensive in treatment cost.
【０００５】[0005]
【課題を解決するための手段】本発明によれば，研削加
工された希土類コバルト系磁石合金の該被研削面の表面
層を酸化させる酸化処理を含むことを特徴とする希土類
コバルト系磁石合金の表面処理方法が得られる。According to the present invention, there is provided a rare earth cobalt-based magnet alloy including an oxidation treatment for oxidizing a surface layer of a ground surface of a ground rare earth cobalt-based magnet alloy. A surface treatment method is obtained.
【０００６】また，本発明によれば，前記希土類コバル
ト系磁石合金の表面処理方法において，前記酸化処理
は，真空中で２００〜９００℃の加熱処理を行うことで
あることを特徴とする希土類コバルト系磁石合金の表面
処理方法が得られる。Further, according to the present invention, in the surface treatment method for the rare earth cobalt-based magnet alloy, the oxidation treatment is a heating treatment at 200 to 900 ° C. in a vacuum. A surface treatment method for a magnet-based alloy is obtained.
【０００７】ここで，本発明の希土類コバルト系磁石合
金の表面処理方法において，真空中で，２００〜８５０
℃の加熱を行うと限定したのは，２００℃以下の温度で
は真空中で表面酸化を行うには長時間かかることが予想
され，一方，８５０℃以上では希土類磁石の磁石が相変
態を起こし，磁石特性が劣化することが考えられるから
である。Here, in the surface treatment method of the rare earth cobalt-based magnet alloy of the present invention, in a vacuum, 200 to 850
The limitation of heating at ℃ is that it takes a long time to perform surface oxidation in vacuum at a temperature of 200 ℃ or less, while the magnet of rare earth magnet undergoes phase transformation at 850 ℃ or more. This is because the magnet characteristics may deteriorate.
【０００８】また，本発明によれば，前記希土類コバル
ト系磁石合金の表面処理方法において，前記酸化処理
は，アルゴンガス及び窒素ガス中で，２００〜８５０℃
の加熱処理を行うことであることを特徴とする希土類コ
バルト系磁石合金の表面処理方法が得られる。Further, according to the present invention, in the surface treatment method for the rare earth cobalt-based magnet alloy, the oxidation treatment is performed in argon gas and nitrogen gas at 200 to 850 ° C.
The surface treatment method of the rare earth cobalt-based magnet alloy is obtained by performing the heat treatment of.
【０００９】ここで，本発明の希土類コバルト系磁石合
金の表面処理方法において，酸化処理雰囲気を規定した
もので，通常希土類コバルト系磁石合金において使用さ
れているものである。Here, in the surface treatment method for a rare earth cobalt-based magnet alloy of the present invention, an oxidizing treatment atmosphere is defined, and it is usually used in a rare earth cobalt-based magnet alloy.
【００１０】また，本発明によれば，前記希土類コバル
ト系磁石合金の表面処理方法において，前記酸化処理
は，大気中で１５０〜２５０℃の加熱処理を行うことで
あることを特徴とする希土類コバルト系磁石合金の表面
処理方法が得られる。Further, according to the present invention, in the surface treatment method for the rare earth cobalt-based magnet alloy, the oxidation treatment is a heat treatment at 150 to 250 ° C. in the atmosphere, and the rare earth cobalt is characterized. A surface treatment method for a magnet-based alloy is obtained.
【００１１】ここで，本発明の希土類コバルト系磁石合
金の表面処理方法において，酸化処理を大気中１５０〜
２５０℃で行うと限定したのは，大気中１５０℃以下で
は，酸化するのに長時間かかり，また，２５０℃以上で
は酸化による磁石の腐蝕が発生するからである。Here, in the surface treatment method of the rare earth cobalt-based magnet alloy according to the present invention, the oxidation treatment is performed in the atmosphere at 150 to 150 ° C.
The reason for limiting the temperature to 250 ° C. is that it takes a long time to oxidize at 150 ° C. or lower in the air, and corrosion of the magnet occurs due to oxidation at 250 ° C. or higher.
【００１２】[0012]
【実施例】以下，本発明の実施例について説明する。EXAMPLES Examples of the present invention will be described below.
【００１３】研削加工後バレル研磨した形状が，６mm×
６mm×１．５mmの２−１７系希土類コバルト系永久磁石
合金を真空中（１０-1〜１０-3Torr）で４５０℃で１時
間以上加熱保持し，その後室温まで冷却した。冷却を早
めるために，該真空雰囲気を不活性雰囲気（Ａｒ，
Ｎ2 ，Ｈｅ）で置換した後に重油等に該永久磁石を投入
しても良い。このように，本発明の実施例において，真
空中で４５０℃で加熱されることにより，該研削加工・
バレル研磨加工された希土類コバルト系永久磁石合金の
表面層が穏やかに酸化され，この酸化層によって該永久
磁石合金の表面が覆われることになる。The barrel-polished shape after grinding is 6 mm ×
A 6 mm × 1.5 mm 2-17 series rare earth cobalt-based permanent magnet alloy was heated and held at 450 ° C. for 1 hour or more in vacuum (10 −1 to 10 −3 Torr), and then cooled to room temperature. In order to accelerate the cooling, the vacuum atmosphere is changed to an inert atmosphere (Ar,
The permanent magnet may be put in heavy oil or the like after the replacement with N 2 , He). As described above, in the embodiment of the present invention, the grinding process is performed by heating at 450 ° C. in vacuum.
The surface layer of the rare earth cobalt-based permanent magnet alloy that has been barrel-polished is gently oxidized, and the surface of the permanent magnet alloy is covered by this oxide layer.
【００１４】本発明の実施例に係る処理方法による効果
を確認するために，本発明の実施例に係る処理を施した
ものと処理を施さない従来品（比較例）とを，着磁し，
一定の高さより，鉄板上に落下させ，割れ，カケの状態
を観察した。その結果を次の表１に示す。In order to confirm the effect of the treatment method according to the embodiment of the present invention, a product subjected to the treatment according to the embodiment of the present invention and a conventional product not subjected to the treatment (comparative example) were magnetized,
From a certain height, it was dropped on an iron plate and the state of cracks and chips was observed. The results are shown in Table 1 below.
【００１５】[0015]
【表１】 [Table 1]
【００１６】表１で示す結果より，処理品は未処理品と
比較し著しく割れカケの発生率が少なく，強度が向上し
ていることがわかる。From the results shown in Table 1, it can be seen that the treated product has a significantly lower occurrence rate of cracks and cracks and the strength is improved as compared with the untreated product.
【００１７】また，本発明の実施例に係る希土類コバル
ト系永久磁石合金（大きさ６mm×６mm×１．５mm）と従
来の未処理品（比較例）との表面の粗さを比較した。そ
の結果を次の表２で示す。Further, the surface roughness of the rare earth cobalt-based permanent magnet alloy (size 6 mm × 6 mm × 1.5 mm) according to the embodiment of the present invention and the conventional untreated product (comparative example) were compared. The results are shown in Table 2 below.
【００１８】[0018]
【表２】 [Table 2]
【００１９】表２から，本発明の実施例に係る処理方法
を施した磁石は，処理を施さない従来品に比し，表面の
粗さが改善されることが判明した。これは，実施例に係
る処理方法によって，研磨加工された磁石表面の鋭角部
や突起部が，酸化され除去されることによるものと推測
される。From Table 2, it has been found that the magnets that have been subjected to the treatment method according to the embodiment of the present invention have an improved surface roughness as compared with the conventional products that have not been treated. It is presumed that this is due to the fact that the sharp edges and protrusions on the magnet surface polished by the treatment method according to the example are oxidized and removed.
【００２０】ちなみに，本発明の処理をした永久磁石に
さらに，メッキや塗装を施せば，よりワレ・カケの少な
い希土類コバルト系永久磁石合金が得られることは容易
に推察できることである。By the way, it can be easily inferred that a rare earth cobalt-based permanent magnet alloy with less cracking and cracking can be obtained by further plating or painting the permanent magnet treated according to the present invention.
【００２１】[0021]
【発明の効果】以上，述べた如く本発明によれば，ワレ
・カケの少なく，表面の粗さが細かいという利点をもっ
た，希土類コバルト系磁石合金の提供が可能となった。As described above, according to the present invention, it is possible to provide a rare earth cobalt-based magnet alloy having the advantages of less cracking and chipping and finer surface roughness.
【００２２】また，本発明の処理方法を施した磁石は，
従来品に比し，割れカケが少ないので，磁石の組立ライ
ンにおける製品歩留向上や，磁石のワレ・カケ等による
汚染等がなくなることによる組立ラインの信頼性向上等
を図ることができる。Further, the magnet to which the treatment method of the present invention is applied is
Compared with conventional products, there are fewer cracks and cracks, so it is possible to improve the product yield in the magnet assembly line and improve the reliability of the assembly line by eliminating contamination such as cracks and chips of the magnet.
Claims (4)
金の該被研削面の表面層を酸化させる酸化処理を含むこ
とを特徴とする希土類コバルト系磁石合金の表面処理方
法。1. A surface treatment method for a rare earth cobalt-based magnet alloy, which comprises an oxidation treatment for oxidizing a surface layer of the ground surface of a ground rare earth cobalt-based magnet alloy.
金の表面処理方法において，前記酸化処理は，真空中で
２００〜９００℃の加熱処理を行うことであることを特
徴とする希土類コバルト系磁石合金の表面処理方法。2. The rare earth cobalt-based magnet according to claim 1, wherein the oxidation treatment is a heating treatment at 200 to 900 ° C. in a vacuum. Alloy surface treatment method.
金の表面処理方法において，前記酸化処理は，アルゴン
ガス及び窒素ガス中で，２００〜８５０℃の加熱処理を
行うことであることを特徴とする希土類コバルト系磁石
合金の表面処理方法。3. The surface treatment method for a rare earth cobalt-based magnet alloy according to claim 1, wherein the oxidation treatment is a heat treatment at 200 to 850 ° C. in argon gas and nitrogen gas. Surface treatment method for rare earth cobalt-based magnet alloys.
金の表面処理方法において，前記酸化処理は，大気中で
１５０〜２５０℃の加熱処理を行うことであることを特
徴とする希土類コバルト系磁石合金の表面処理方法。4. The rare earth cobalt-based magnet according to claim 1, wherein the oxidation treatment is a heating treatment at 150 to 250 ° C. in the atmosphere. Alloy surface treatment method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4265745A JPH06120014A (en) | 1992-10-05 | 1992-10-05 | Surface treatment of rare earth-obalt magnet alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4265745A JPH06120014A (en) | 1992-10-05 | 1992-10-05 | Surface treatment of rare earth-obalt magnet alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06120014A true JPH06120014A (en) | 1994-04-28 |
Family
ID=17421414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4265745A Pending JPH06120014A (en) | 1992-10-05 | 1992-10-05 | Surface treatment of rare earth-obalt magnet alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06120014A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006303197A (en) * | 2005-04-20 | 2006-11-02 | Neomax Co Ltd | Method for manufacturing r-t-b system sintered magnet |
| JP2007300790A (en) * | 2000-07-31 | 2007-11-15 | Shin Etsu Chem Co Ltd | Method for using rare earth sintered magnet |
| US7438768B2 (en) | 2001-12-28 | 2008-10-21 | Shin-Etsu Chemical Co., Ltd. | Rare earth element sintered magnet and method for producing rare earth element sintered magnet |
| JP2010255540A (en) * | 2009-04-27 | 2010-11-11 | Hitachi Automotive Systems Ltd | High pressure fuel pump |
| CN114420439A (en) * | 2022-03-02 | 2022-04-29 | 浙江大学 | Method for improving high-abundance rare earth permanent magnet corrosion resistance by high-temperature oxidation treatment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50117623A (en) * | 1974-03-01 | 1975-09-13 |
-
1992
- 1992-10-05 JP JP4265745A patent/JPH06120014A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50117623A (en) * | 1974-03-01 | 1975-09-13 |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007300790A (en) * | 2000-07-31 | 2007-11-15 | Shin Etsu Chem Co Ltd | Method for using rare earth sintered magnet |
| US7438768B2 (en) | 2001-12-28 | 2008-10-21 | Shin-Etsu Chemical Co., Ltd. | Rare earth element sintered magnet and method for producing rare earth element sintered magnet |
| JP2006303197A (en) * | 2005-04-20 | 2006-11-02 | Neomax Co Ltd | Method for manufacturing r-t-b system sintered magnet |
| JP4618553B2 (en) * | 2005-04-20 | 2011-01-26 | 日立金属株式会社 | Method for producing RTB-based sintered magnet |
| JP2010255540A (en) * | 2009-04-27 | 2010-11-11 | Hitachi Automotive Systems Ltd | High pressure fuel pump |
| CN114420439A (en) * | 2022-03-02 | 2022-04-29 | 浙江大学 | Method for improving high-abundance rare earth permanent magnet corrosion resistance by high-temperature oxidation treatment |
| CN114420439B (en) * | 2022-03-02 | 2022-12-27 | 浙江大学 | Method for improving corrosion resistance of high-abundance rare earth permanent magnet through high-temperature oxidation treatment |
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