JPS62149108A - Manufacture of permanent magnet - Google Patents

Manufacture of permanent magnet

Info

Publication number
JPS62149108A
JPS62149108A JP28931485A JP28931485A JPS62149108A JP S62149108 A JPS62149108 A JP S62149108A JP 28931485 A JP28931485 A JP 28931485A JP 28931485 A JP28931485 A JP 28931485A JP S62149108 A JPS62149108 A JP S62149108A
Authority
JP
Japan
Prior art keywords
permanent magnet
coating
alcoholate
magnet
metal oxide
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
Application number
JP28931485A
Other languages
Japanese (ja)
Other versions
JPH0237081B2 (en
Inventor
Tsutomu Otsuka
努 大塚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokin Corp
Original Assignee
Tohoku Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tohoku Metal Industries Ltd filed Critical Tohoku Metal Industries Ltd
Priority to JP28931485A priority Critical patent/JPH0237081B2/en
Publication of JPS62149108A publication Critical patent/JPS62149108A/en
Publication of JPH0237081B2 publication Critical patent/JPH0237081B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus 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
    • H01F41/02Apparatus 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
    • H01F41/0253Apparatus 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
    • H01F41/026Apparatus 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)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

PURPOSE:To prevent a magnetic alloy from being oxdized during treatments thereof, by applying a metallic alcoholate on a permanent magnet formed by molding and sintering a R2T14B permanent magnet material and hydrolyzing the metallic alcoholate to form a coat of a metal oxide on the surface of the permanent magnet. CONSTITUTION:Nb having a purity of 95% or over, electrolytic iron and crystal born are melted and cooled in the atmosphere of argon to obtain an ingot. The ingot is then ground and molded under pressure. The pressure-molded powder body is sintered and cooled slowly. The body is further heated and quenched to obtain a permanent magnet. The permanent magnet thus obtained is degreased with trichloroethylene, and Si alcoholate is applied thereon by spraying the same. The permanent magnet is then heated for 20min at a temperature of 100-200 deg.C. In this manner, a transparent SiO2 film can be formed on the surface of the magnet.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は希土類金属(R)と、遷移金属(T)とからな
るNd2Fe14B系合金で代表されるR、’r、、 
B基金属間化合物磁石の中で、特にR(Yを含む希土類
元素のうちの少なくとも一種)・Fe−Bを主成分とす
る永久磁石材料に係るR−Fe−B系磁石材料の製造方
法に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to R, 'r,
Among B-based intermetallic compound magnets, the present invention relates to a method for producing an R-Fe-B magnet material, particularly a permanent magnet material containing R (at least one rare earth element including Y) and Fe-B as a main component. It is something.

〔従来の技術〕[Conventional technology]

従来、Nd−Fe−Bで代表されるR−Fe−B系磁石
材料は現在市販されている5nCo系永久磁石材料に比
べ高い磁気特性を有している。ただこのR−Fe−B系
磁石材料は大気中で極度に酸化しやすい希土類元素と鉄
を含有するため、何の処理を施すことなく磁気回路等の
装置に組込んだ場合、磁石材料の酸化による特性の劣化
、ばらつきが生じ、さらに、磁石材料よシ発生する酸化
物の飛散による周辺部品への汚染が生じる。そのため従
来は磁石表面に耐酸化性皮膜を形成して上記のばらつき
と汚染を防止していた。そしてこれらの耐酸化性改善の
公知例として特開昭60−54406号公報及び特開昭
60−63902号公報に記載の発明が知られている。
Conventionally, R-Fe-B magnet materials represented by Nd-Fe-B have higher magnetic properties than 5nCo permanent magnet materials currently on the market. However, this R-Fe-B magnet material contains rare earth elements and iron that are extremely easily oxidized in the atmosphere, so if it is incorporated into a device such as a magnetic circuit without any treatment, the magnet material may oxidize. This causes deterioration and variation in characteristics due to the magnet material, and furthermore, contamination of surrounding components occurs due to scattering of oxides generated from the magnet material. Therefore, in the past, an oxidation-resistant film was formed on the magnet surface to prevent the above-mentioned variations and contamination. The inventions described in JP-A-60-54406 and JP-A-60-63902 are known examples of improvements in oxidation resistance.

以下余日 〔発明が解決しようとする問題点〕 しかしながら、これらの公知例による耐酸化性皮膜は皮
膜形成工程中で多量の水を使用するため、処理工程中で
磁石材料が酸化する恐れがあり、耐酸化性が充分でなか
った。
[Problems to be solved by the invention] However, since the oxidation-resistant coatings according to these known examples use a large amount of water during the coating formation process, there is a risk that the magnet material may be oxidized during the treatment process. , the oxidation resistance was insufficient.

したがって本発明は耐酸化性皮膜形成処理に水を使用し
なくて済む永久磁石の製造方法を提供しようとするもの
である。
Therefore, it is an object of the present invention to provide a method for producing a permanent magnet that does not require the use of water in the oxidation-resistant film forming process.

〔問題点を解決するだめの手段〕[Failure to solve the problem]

本発明の永久磁石の製造方法は、R(イツトリウムを含
む希土類元素のうち少なくとも一種)。
The method for producing a permanent magnet of the present invention uses R (at least one rare earth element including yttrium).

Fe(鉄)、B(ボロン)を主成分とするR、T、、 
B系永久磁石材料を成型、焼結後、その表面に金属の酸
化物を被覆する永久磁石の製造方法において、前記表面
に金属の酸化物を被覆する工程が。
R, T, whose main components are Fe (iron) and B (boron).
A method for manufacturing a permanent magnet in which a B-based permanent magnet material is molded and sintered, and then its surface is coated with a metal oxide, including the step of coating the surface with a metal oxide.

前記表面に金属系アルコラートを塗布し、加熱分解して
金属の酸化物皮膜を形成させることを特徴とするもので
ある。
The method is characterized in that a metal alcoholate is applied to the surface and thermally decomposed to form a metal oxide film.

この本発明の方法によれば、酸化膜被覆工程中に水を全
く含まないため、従来の水を多量に使用するメッキ、化
成処理などとは異って、処理工程中に磁石合金自体を酸
化することを抑制する。
According to the method of the present invention, no water is included during the oxide film coating process, so unlike conventional plating and chemical conversion treatments that use a large amount of water, the magnet alloy itself is oxidized during the process. restrain from doing.

〔実施例〕〔Example〕

以下本発明の耐酸化性の優れた永久磁石の製造方法を実
施例について説明する。
The method for manufacturing a permanent magnet with excellent oxidation resistance according to the present invention will be described below with reference to Examples.

先ず、純度95%以上のNd(ネオジム)、電解鉄、ク
リスタルBをアルゴン雰囲気中で高周波加熱により溶解
し、鋳込後200℃まで100℃/minの速度で冷却
し1合金組成が33wt%Nd−1wt%B −baA
Feのインゴットを得る。
First, Nd (neodymium) with a purity of 95% or more, electrolytic iron, and crystal B are melted by high-frequency heating in an argon atmosphere, and after casting, the mixture is cooled to 200°C at a rate of 100°C/min to obtain an alloy with an alloy composition of 33 wt% Nd. -1wt%B -baA
Obtain an Fe ingot.

次に、そのインゴットをアルゴン雰囲気中で粗粉砕した
後、約4μmにボールミルで湿式粉砕し、この粉末を1
0KOeの磁界中で1.Ot/、L2の圧力で成形する
。そしてとの圧粉体を1o50〜1100℃で2時間A
r中焼結し、100℃/hr以下の冷却速度で徐冷する
Next, the ingot was roughly pulverized in an argon atmosphere, then wet pulverized in a ball mill to about 4 μm, and this powder was
1. In a magnetic field of 0 KOe. Molding is performed at a pressure of Ot/, L2. Then, the green compact was heated to 1o50~1100℃ for 2 hours.
The material is sintered during the heating process, and then slowly cooled at a cooling rate of 100° C./hr or less.

その後、この焼結体を500〜600℃で1時間熱処理
し、急冷することにより永久磁石を得ることが出来る。
Thereafter, a permanent magnet can be obtained by heat-treating this sintered body at 500 to 600° C. for 1 hour and rapidly cooling it.

このようにして得られた永久磁石から10wnX 10
mX 8 mmの試験片を切シ出した。
From the permanent magnet thus obtained, 10wnX 10
A test piece of m×8 mm was cut out.

上記の試験片をトリクレン脱脂後、sl−アルコラート
をスプレーにて塗布した後、  100〜200°Cで
20分間加熱する。すると、磁石表面に透明な5102
膜を得ることが出来る。この生成した膜厚は最小で5μ
m、最大15μmである。
After degreasing the above test piece with trichlene, sl-alcoholate was applied by spray, and then heated at 100 to 200°C for 20 minutes. Then, transparent 5102 on the surface of the magnet
A membrane can be obtained. The minimum thickness of this film is 5μ
m, maximum 15 μm.

この様にして5in2をコーティングした永久磁石試験
片と、コーティングしていない無処理試験片とを” J
IS−Z−2371”にもとづ< 72hr−5チ塩水
噴霧試験を行ったところ9コーテイングを施した場合は
表面いずれの部分にも酸化が発生しないが、コーティン
グを施さない場合は全面に多量の赤さびが発生した。
In this way, the permanent magnet test piece coated with 5in2 and the untreated test piece without coating were tested.
Based on IS-Z-2371'', a salt spray test for <72 hours for 5 hours was conducted and found that no oxidation occurred on any part of the surface when 9 coating was applied, but a large amount of oxidation occurred on the entire surface when no coating was applied. Red rust occurred.

さらに、 5in2コーテイングを施した場合と。Furthermore, when 5in2 coating is applied.

コーティングを施していない場合との磁気特性上の説明
及び表1から分るように9本実施例の酸化物で被覆され
た永久磁石は、耐酸化性に優れ、而も磁石特性に何ら影
響を及ぼしていないことが分る。
As can be seen from Table 1 and the explanation of the magnetic properties compared to the case without coating, the permanent magnet coated with the oxide of this example has excellent oxidation resistance, and has no effect on the magnetic properties. It turns out that it doesn't have any effect.

さらに他の実施例として次の方法がある。Still another example is the following method.

前述した永久磁石試験片をトリクレン脱脂乾燥後、 T
i−アルコラートをスプレーにて塗布した後100〜2
00℃で20分間加熱すると1表面にアルコラートをス
プレーで塗布し、 ioo〜200 ’Cの温度で加分
間加熱すると、白いTie2膜上に透明な5in2膜が
得られる。この2相の膜厚は最小で5μm、最大で20
μmである。
After degreasing and drying the above-mentioned permanent magnet test piece, T
100-2 after applying i-alcolate by spray
After heating at 00° C. for 20 minutes, one surface is sprayed with alcoholate and heated at a temperature of ioo~200'C for a period of time to obtain a transparent 5in2 film on the white Tie2 film. The film thickness of these two phases is 5 μm at the minimum and 20 μm at the maximum.
It is μm.

以上の様にして得られたTl 02.5in2の2相で
コーティングされた永久磁石と、コーティングされてい
ない永久磁石とをJIS −Z −2371にもとづ<
 72hr−5%塩水噴霧試験を行った結果、コーティ
ングしであると酸化が全く発生しないが。
The permanent magnet coated with two phases of Tl 02.5in2 obtained as described above and the uncoated permanent magnet were prepared based on JIS-Z-2371.
As a result of a 72-hour 5% salt water spray test, no oxidation occurred when coated.

コーティングしてないと、全面に多量の赤さびが発生し
た。
Without coating, a large amount of red rust appeared on the entire surface.

さらに、 TiO2+ 5in2の2相コーテイングを
施した場合と、コーティングを施していない場合との磁
気特性を表2に示す。
Furthermore, Table 2 shows the magnetic properties when a two-phase coating of TiO2+ 5in2 was applied and when no coating was applied.

一表2− 表2より、2相の被覆にした場合も永久磁石の磁石特性
には回答影響が無いことが判る。
Table 1 - From Table 2, it can be seen that the magnetic properties of the permanent magnet are not affected even when the two-phase coating is used.

上記の実施例はTiO2+ 5i02の2相の被覆にし
た場合であるが、更にAt203を加えた3相にすれば
より効果的であり、更に多数重ねれば更に効果的である
The above embodiment is a case in which a two-phase coating of TiO2+ 5i02 is used, but it is more effective to use a three-phase coating in which At203 is further added, and even more effective if a larger number of layers are stacked.

耐酸化性皮膜の厚さは、コスト面9寸法精度。The thickness of the oxidation-resistant film is 9 dimensional accuracy in terms of cost.

耐酸化性の面から2〜20μmが好ましい。From the viewpoint of oxidation resistance, the thickness is preferably 2 to 20 μm.

μ下余臼 〔発明の効果〕 以上のように本発明の方法においては、酸化物被覆を形
成するのに前処理を含めて水を全く使用しないので、処
理工程中に磁石合金自体が酸化することを抑制でき、従
って永久磁石の磁気特性には何らの影響を与えず、また
酸化物の飛散による周辺の汚染を防止することができる
μ Lower Mill [Effect of the Invention] As described above, in the method of the present invention, no water is used at all including pretreatment to form the oxide coating, so the magnet alloy itself is not oxidized during the treatment process. Therefore, the magnetic properties of the permanent magnet are not affected in any way, and contamination of the surrounding area due to scattering of oxides can be prevented.

Claims (1)

【特許請求の範囲】[Claims] 1、R(イットリウムを含む希土類元素のうち少なくと
も一種)、Fe(鉄)、B(ボロン)を主成分とするR
_2T_1_4B系永久磁石材料を成型、焼結後、その
表面に金属の酸化物を被覆する永久磁石の製造方法にお
いて、前記表面に金属の酸化物を被覆する工程が、前記
表面に金属系アルコラートを塗布し、加熱分解して金属
の酸化物皮膜を形成させることを特徴とする永久磁石の
製造方法。
1. R whose main components are R (at least one rare earth element including yttrium), Fe (iron), and B (boron)
_2T_1_4B Permanent magnet material is molded and sintered, and then the surface thereof is coated with a metal oxide. In the method for manufacturing a permanent magnet, the step of coating the surface with a metal oxide comprises coating the surface with a metal alcoholate. A method for producing a permanent magnet, which comprises forming a metal oxide film through thermal decomposition.
JP28931485A 1985-12-24 1985-12-24 EIKYUJISHAKUNOSEIZOHOHO Expired - Lifetime JPH0237081B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28931485A JPH0237081B2 (en) 1985-12-24 1985-12-24 EIKYUJISHAKUNOSEIZOHOHO

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28931485A JPH0237081B2 (en) 1985-12-24 1985-12-24 EIKYUJISHAKUNOSEIZOHOHO

Publications (2)

Publication Number Publication Date
JPS62149108A true JPS62149108A (en) 1987-07-03
JPH0237081B2 JPH0237081B2 (en) 1990-08-22

Family

ID=17741579

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28931485A Expired - Lifetime JPH0237081B2 (en) 1985-12-24 1985-12-24 EIKYUJISHAKUNOSEIZOHOHO

Country Status (1)

Country Link
JP (1) JPH0237081B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0984460A2 (en) * 1998-08-31 2000-03-08 Sumitomo Special Metals Co., Ltd. Fe-B-R based permanent magnet having corrosion-resistant film, and process for producing the same
EP0984464A2 (en) * 1998-08-31 2000-03-08 Sumitomo Special Metals Co., Ltd. Process for producing Fe-B-R based permanent magnet having a corrosion-resistant film
EP1011112A3 (en) * 1998-12-17 2000-07-12 Sumitomo Special Metals Co., Ltd. Rare earth metal-based permanent magnet, and process for producing the same
CN108806964A (en) * 2018-06-27 2018-11-13 京磁材料科技股份有限公司 Method applied to neodymium iron boron surface treatment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0484990A (en) * 1990-07-30 1992-03-18 Miyamoto Kk Housing for machine sewing thread

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0984460A2 (en) * 1998-08-31 2000-03-08 Sumitomo Special Metals Co., Ltd. Fe-B-R based permanent magnet having corrosion-resistant film, and process for producing the same
EP0984464A2 (en) * 1998-08-31 2000-03-08 Sumitomo Special Metals Co., Ltd. Process for producing Fe-B-R based permanent magnet having a corrosion-resistant film
EP0984464A3 (en) * 1998-08-31 2000-06-07 Sumitomo Special Metals Co., Ltd. Process for producing Fe-B-R based permanent magnet having a corrosion-resistant film
EP0984460A3 (en) * 1998-08-31 2000-07-12 Sumitomo Special Metals Co., Ltd. Fe-B-R based permanent magnet having corrosion-resistant film, and process for producing the same
US6251196B1 (en) 1998-08-31 2001-06-26 Sumitomo Special Metals Co., Ltd. Process for producing Fe-B-R based permanent magnet having a corrosion-resistant film
EP1011112A3 (en) * 1998-12-17 2000-07-12 Sumitomo Special Metals Co., Ltd. Rare earth metal-based permanent magnet, and process for producing the same
CN108806964A (en) * 2018-06-27 2018-11-13 京磁材料科技股份有限公司 Method applied to neodymium iron boron surface treatment

Also Published As

Publication number Publication date
JPH0237081B2 (en) 1990-08-22

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