JPS61195964A - Rust preventing method of permanent magnet alloy - Google Patents
Rust preventing method of permanent magnet alloyInfo
- Publication number
- JPS61195964A JPS61195964A JP3809085A JP3809085A JPS61195964A JP S61195964 A JPS61195964 A JP S61195964A JP 3809085 A JP3809085 A JP 3809085A JP 3809085 A JP3809085 A JP 3809085A JP S61195964 A JPS61195964 A JP S61195964A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- mainly composed
- rare earth
- rust
- partial pressure
- 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.)
- Granted
Links
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、人気中で容易に酸化しやすい希土類遷移金属
永久磁石の防錆方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rust prevention method for rare earth transition metal permanent magnets which are popular and easily oxidized.
［従来の技術］
希土類鉄系永久磁石において、特にＲ−Ｆｅ −Ｍ永久
磁石（ＲはＮｄ、 Ｐｒ、 Ｃｅ、 Ｄｙであり、Ｍは
Ｂ、Ｓｉ等のメタロイド元素である。）は、大気中で容
易に酸化しやすいため、小型電子機器等部品１度が要求
される部位、たとえば永久磁石を含む磁気回路における
磁気空隙は、このような永久磁石が組込まれている場合
、その表面が酸化されると磁気特性の劣化による実質的
な磁気空隙の変化によるパーミアンスの変動により小型
電子機器の性能を劣化させることが多い。[Prior Art] Rare earth iron-based permanent magnets, especially R-Fe-M permanent magnets (R is Nd, Pr, Ce, Dy, M is a metalloid element such as B or Si), are used in the atmosphere. Therefore, parts such as small electronic devices that require one degree of oxidation, such as magnetic gaps in magnetic circuits containing permanent magnets, are susceptible to oxidation on the surface when such permanent magnets are incorporated. In this case, the performance of small electronic devices often deteriorates due to fluctuations in permeance due to changes in the magnetic air gap due to deterioration of magnetic properties.
そのため従来からＣｒ、 Ｎｉ等を湿式メッキ手段によ
りその表面に被覆することにより酸化防止が計られてき
た。Therefore, oxidation prevention has conventionally been attempted by coating the surface with Cr, Ni, etc. by wet plating means.
［発明が解決しようとする問題点］
しかしながら湿式メッキ手段は、メッキ前工程において
は、脱脂、酸化物除去工程の際に永久磁石自体の表面が
腐蝕されるために、メッキがされにくくなり、またメッ
キ後においては、永久磁石界面とメッキ層間に空隙が発
生しやすくなるため、その部分から剥離が起きる。さら
にピンホールから発錆しやすくなる欠点もあった。[Problems to be Solved by the Invention] However, in the wet plating method, the surface of the permanent magnet itself is corroded during the degreasing and oxide removal steps in the pre-plating process, making it difficult to plate. After plating, a gap is likely to occur between the permanent magnet interface and the plating layer, and peeling occurs from that part. Another drawback was that pinholes were more likely to cause rust.
本発明はこの点を考慮して、被覆層の密着性が良好であ
り、かつ活性な被被覆体に対して悪影響を及ぼさない防
錆方法を提供することを目的とする。In consideration of this point, the present invention aims to provide a rust prevention method in which the adhesion of the coating layer is good and does not have an adverse effect on the active material to be coated.
［問題点を解決するための手段］
本発明はＲ（Ｔ、Ｍ）７ （Ｒは希土類金属の一種もし
くは二種以上の混合物、−「はＦｅ、 Ｃｏを主体とす
る遷移金ｍｌ、ＭはＢを主体とするメタロイド元素、ｚ
−４〜９）の一般形で示される永久磁石材料を実用形状
に加工した後において、１０−８〜Ｉ ＴＯｒｒの酸素
分圧下で３００〜１，２００℃の温度領域内で加熱し、
永久磁石材料の表面に酸化防止膜を形成することを特徴
とした永久磁石合金の防錆方法であり、酸化防止膜は５
０膚以下であることが望ましい。加熱時においてその雰
囲気の酸素量が１０’Ｔｏｒｒ未満であると酸化防止膜
が形成されず、ｉ ＴＯｒｒを超えると酸化層が皮膜に
なり、永久磁石自体の磁気特性が劣化する。[Means for Solving the Problems] The present invention provides R(T,M)7 (R is one kind or a mixture of two or more rare earth metals, -" is a transition gold ml mainly composed of Fe and Co, and M is a transition gold ml mainly composed of Fe and Co. Metalloid element mainly composed of B, z
-4 to 9) After processing the permanent magnet material shown in the general form into a practical shape, heating it in a temperature range of 300 to 1,200 °C under an oxygen partial pressure of 10 -8 to I TOrr,
A rust prevention method for permanent magnet alloys characterized by forming an oxidation prevention film on the surface of a permanent magnet material, and the oxidation prevention film is
It is desirable that it be less than 0 skin. If the amount of oxygen in the atmosphere during heating is less than 10' Torr, an oxidation-preventing film will not be formed, and if it exceeds i TOrr, the oxidized layer will turn into a film and the magnetic properties of the permanent magnet itself will deteriorate.
また加熱温度が３００℃未満では酸化防止膜の形成に寄
与せず、１ 、２００℃を超えると永久磁石内部に酸素
が拡散して磁気特性が大きく劣化する。Further, if the heating temperature is less than 300°C, it will not contribute to the formation of an anti-oxidation film, and if it exceeds 1 to 200°C, oxygen will diffuse into the permanent magnet and the magnetic properties will be greatly deteriorated.
したがってこのような条件下で酸化防止膜が５０膚を超
えると酸化皮膜となり好ましくない。Therefore, if the antioxidant film exceeds 50% under such conditions, it becomes an oxidized film, which is not preferable.
［作用］
本発明により形成される酸化防止膜は、黒錆であると思
われ、これが永久磁石自体の表面に薄膜状に被覆される
ことにより、空気中で安定化すると考えられる。[Function] The anti-oxidation film formed by the present invention is thought to be black rust, and is thought to be stabilized in the air by being coated in a thin film on the surface of the permanent magnet itself.
［実施例］
Ｎｄ（Ｆｅ Ｂ ） の組成合金を溶解→粗
０．９０．１５
粉砕→微粉砕→磁場成形の手順で生材を得、１０８０℃
の温度で焼結し９履角の焼結体を得た。次にその焼結体
を８履角に研削加工し、１０’Ｔｏｒｒの酸素分圧下に
て１０５０℃、３０ｍ１ｎ加熱し室温まで冷却後さらに
６００℃、６０ｇ＋ｉｎの熱処理を施し試料Ａとした。[Example] A raw material was obtained by melting a composition alloy of Nd (Fe B ) → rough 0.90.15 pulverization → fine pulverization → magnetic field forming, and heated to 1080°C.
A sintered body of 9 shoe angles was obtained by sintering at a temperature of . Next, the sintered body was ground to 8 shoe angles, heated at 1050° C. for 30 ml under an oxygen partial pressure of 10′ Torr, cooled to room temperature, and further heat-treated at 600° C. for 60 g+in to obtain Sample A.
一方同じ焼結体を研削加工前に最終熱処理を施し、その
後８履角に研削加工を行ない試料Ｂとした。試料Ａ、Ｂ
の磁気特性を第１表に示す。On the other hand, the same sintered body was subjected to final heat treatment before grinding, and then ground to 8 shoe angles to obtain Sample B. Sample A, B
The magnetic properties of are shown in Table 1.
第１表
次に試料Ａ、Ｂを温度６５℃、湿度９５％の環境条件下
に放置し発錆状況を観察したところ、試料Ｂは表面全体
が赤錆に腐蝕され加工表面が認められなかったが、試Ｆ
ＩＡは周辺部で若干赤錆が観察されたが、加工表面は全
く変質が認められなかった。Table 1 Next, samples A and B were left in an environmental condition of a temperature of 65°C and a humidity of 95% and the state of rust was observed.The entire surface of sample B was corroded with red rust and no processed surface was observed. , Trial F
Although some red rust was observed on the periphery of IA, no alteration was observed on the processed surface.
［発明の効果］
以上のように、本発明による表面処野方払を施した永久
磁石は、耐食性に優れ、被覆材料と永久磁石表面との密
着性も強固であり、また被覆層の膜厚のｌｌ］ＩＩｌも
容易にできるため、小型電子ｍ３等部品精度が要求され
る部位に適しており、従来の方法よりも機能的、コスト
的にも優れた利点を有している。[Effects of the Invention] As described above, the permanent magnet subjected to the surface treatment method of the present invention has excellent corrosion resistance, strong adhesion between the coating material and the surface of the permanent magnet, and a reduction in the thickness of the coating layer. ll] IIl can be easily performed, so it is suitable for parts requiring precision of parts such as small electronic m3, and has advantages over conventional methods in terms of functionality and cost.
Claims (2)
は二種以上の混合物、ＴはＦｅ、Ｃｏを主体とする遷移
金属、ＭはＢを主体とするメタロイド元素、ｚ＝４〜９
）の一般形で示される永久磁石材料を実用形状に加工し
た後において、１０＾−＾８〜１Ｔｏｒｒの酸素分圧下
で３００〜１，２００℃の温度領域内で加熱し、永久磁
石材料の表面に酸化防止膜を形成することを特徴とした
永久磁石合金の防錆方法。(1) R(T, M)_z (R is one type of rare earth metal or a mixture of two or more types, T is a transition metal mainly composed of Fe and Co, M is a metalloid element mainly composed of B, z = 4 ~ 9
) After processing the permanent magnet material shown in the general form into a practical shape, the surface of the permanent magnet material is A rust prevention method for a permanent magnetic alloy, which is characterized by forming an oxidation-preventing film on the permanent magnet alloy.
合金の防錆方法。(2) The method for preventing rust of a permanent magnet alloy according to claim (1), wherein the anti-oxidation film is formed to a thickness of 50 μm or less (excluding zero).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3809085A JPS61195964A (en) | 1985-02-27 | 1985-02-27 | Rust preventing method of permanent magnet alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3809085A JPS61195964A (en) | 1985-02-27 | 1985-02-27 | Rust preventing method of permanent magnet alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61195964A true JPS61195964A (en) | 1986-08-30 |
| JPS6254868B2 JPS6254868B2 (en) | 1987-11-17 |
Family
ID=12515775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3809085A Granted JPS61195964A (en) | 1985-02-27 | 1985-02-27 | Rust preventing method of permanent magnet alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61195964A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6388404A (en) * | 1986-10-01 | 1988-04-19 | Honda Motor Co Ltd | Iron based sintered alloy rotator surface treated for detection of rotational speed |
| JPH05171139A (en) * | 1991-12-19 | 1993-07-09 | Toshiba Corp | Cold-accumulation material |
| US6623541B2 (en) * | 2000-07-31 | 2003-09-23 | Shin-Etsu Chemical Co., Ltd. | Sintered rare earth magnet and making method |
| US6746545B2 (en) * | 2000-05-31 | 2004-06-08 | Shin-Etsu Chemical Co., Ltd. | Preparation of rare earth permanent magnets |
| JP2010273426A (en) * | 2009-05-20 | 2010-12-02 | Toshiba Corp | Permanent magnet motor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7198075B2 (en) * | 2018-12-21 | 2022-12-28 | 株式会社ダイドー電子 | RFeB-based sintered magnet and its manufacturing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59217304A (en) * | 1983-05-25 | 1984-12-07 | Sumitomo Special Metals Co Ltd | Permanent magnet material and manufacture thereof |
-
1985
- 1985-02-27 JP JP3809085A patent/JPS61195964A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59217304A (en) * | 1983-05-25 | 1984-12-07 | Sumitomo Special Metals Co Ltd | Permanent magnet material and manufacture thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6388404A (en) * | 1986-10-01 | 1988-04-19 | Honda Motor Co Ltd | Iron based sintered alloy rotator surface treated for detection of rotational speed |
| JPH05171139A (en) * | 1991-12-19 | 1993-07-09 | Toshiba Corp | Cold-accumulation material |
| US6746545B2 (en) * | 2000-05-31 | 2004-06-08 | Shin-Etsu Chemical Co., Ltd. | Preparation of rare earth permanent magnets |
| US6623541B2 (en) * | 2000-07-31 | 2003-09-23 | Shin-Etsu Chemical Co., Ltd. | Sintered rare earth magnet and making method |
| JP2010273426A (en) * | 2009-05-20 | 2010-12-02 | Toshiba Corp | Permanent magnet motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6254868B2 (en) | 1987-11-17 |
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