JPS62256412A - Permanent magnet with prominent resistance to oxidation - Google Patents
Permanent magnet with prominent resistance to oxidationInfo
- Publication number
- JPS62256412A JPS62256412A JP61099753A JP9975386A JPS62256412A JP S62256412 A JPS62256412 A JP S62256412A JP 61099753 A JP61099753 A JP 61099753A JP 9975386 A JP9975386 A JP 9975386A JP S62256412 A JPS62256412 A JP S62256412A
- Authority
- JP
- Japan
- Prior art keywords
- elements
- oxidation
- magnetic
- powders
- magnet
- 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
- 230000003647 oxidation Effects 0.000 title claims abstract description 20
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 20
- 230000005291 magnetic effect Effects 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 13
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 239000011812 mixed powder Substances 0.000 claims abstract description 7
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims abstract 2
- 229910052733 gallium Inorganic materials 0.000 claims abstract 2
- 229910052732 germanium Inorganic materials 0.000 claims abstract 2
- 229910052738 indium Inorganic materials 0.000 claims abstract 2
- 229910052745 lead Inorganic materials 0.000 claims abstract 2
- 229910052717 sulfur Inorganic materials 0.000 claims abstract 2
- 229910052718 tin Inorganic materials 0.000 claims abstract 2
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 229910052742 iron Inorganic materials 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 8
- 238000007739 conversion coating Methods 0.000 abstract description 5
- 239000006247 magnetic powder Substances 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 229910052725 zinc Inorganic materials 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 16
- 239000000463 material Substances 0.000 description 8
- 238000005245 sintering Methods 0.000 description 8
- 238000000280 densification Methods 0.000 description 5
- 238000007731 hot pressing Methods 0.000 description 5
- 238000001272 pressureless sintering Methods 0.000 description 5
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- CPSYWNLKRDURMG-UHFFFAOYSA-L hydron;manganese(2+);phosphate Chemical compound [Mn+2].OP([O-])([O-])=O CPSYWNLKRDURMG-UHFFFAOYSA-L 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 3
- 229910000165 zinc phosphate Inorganic materials 0.000 description 3
- 238000009770 conventional sintering Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 229920003319 Araldite® Polymers 0.000 description 1
- 238000007718 adhesive strength test Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002345 surface coating layer Substances 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
- 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
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はＹを含む希土類元素（以下Ｒと略記する）とＦ
ｅ 、 Ｂよシ成る金属間化合物及び非磁性元素Ｍよシ
成るＲ２Ｆｅ１４Ｂ−Ｍ系磁石材料において、その耐酸
化性を改善したＲ２Ｆｅ１４Ｂ−Ｍ系磁石材料に関する
ものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a rare earth element containing Y (hereinafter abbreviated as R) and F
The present invention relates to an R2Fe14B-M based magnet material having improved oxidation resistance, which is composed of an intermetallic compound consisting of e and B and a non-magnetic element M.
Ｒ−Ｆｅ−Ｂ系永久磁石の文献として、特開昭５９−４
６００８号公報や日本応用磁気学会、第３５回研究会資
料（昭５９年５月）などの焼結法によるもの、超急冷（
メルトスピニング法による）物質の焼鈍法によるもの（
特開昭６０−１００４０２ ）、射出成形法及びボンド
磁石法によるもの（特開昭５９−２１９９０４ ）など
が挙げられる。これらの中で、焼結法による永久磁石が
最も高い磁気特性を有し、現在市販されているＳｍ−Ｃ
ｏ系磁石の代替として広がりつつある。As a document on R-Fe-B permanent magnets, JP-A-59-4
Those using sintering methods such as Publication No. 6008 and Japan Society of Applied Magnetics, 35th Research Meeting Materials (May 1980), ultra-quenching (
by melt spinning method)) by annealing the material (
JP-A-60-100402), injection molding method and bonded magnet method (JP-A-59-219904). Among these, permanent magnets produced by sintering have the highest magnetic properties, and are currently commercially available Sm-C.
It is becoming popular as an alternative to o-based magnets.
この焼結法によるＲ−Ｆｅ−Ｂ系磁石は、Ｒ−Ｆｅ−Ｂ
系合金粉末成形体を常圧焼結法により得る方法であり、
その焼結法はＳｍ−Ｃｏ系永久磁石の製造で確立した技
術を、適用したものである。The R-Fe-B magnet produced by this sintering method is made of R-Fe-B
This is a method of obtaining a compacted alloy powder by pressureless sintering method,
The sintering method is an application of technology established in the production of Sm--Co permanent magnets.
この常圧焼結法によｐＲ−Ｆｅ−Ｂ系永久磁石を製造す
る場合、その緻密化は、高Ｎｄ相（液相）の出現に伴う
液相焼結によりて成される。それ故、焼結体中には磁性
相であり主相であるＲ２Ｆ８１４Ｂ相、非磁性相である
Ｂ富裕相、酸化物相の他に液相成分相であるＲ富裕相が
存在する。一般に本系磁石合金では、これら各相の存在
比に対応して磁石特性（特にＢｒ ｅ （ＢＨ）ｍａｘ
）は変化する。現状のプロセスによシ得られる焼結体
中で、これら非磁性相の体積構成比は約１０％以上であ
る。When producing a pR-Fe-B permanent magnet by this pressureless sintering method, its densification is achieved by liquid phase sintering accompanied by the appearance of a high Nd phase (liquid phase). Therefore, in the sintered body, in addition to the R2F814B phase which is a magnetic phase and the main phase, the B-rich phase which is a non-magnetic phase, and the oxide phase, there is an R-rich phase which is a liquid phase component phase. In general, in this magnetic alloy, the magnetic properties (especially Bre (BH) max
) changes. In the sintered body obtained by the current process, the volume composition ratio of these non-magnetic phases is about 10% or more.
また、常圧焼結の場合には、充分な緻密化を得るために
は、液相成分を体積構成比で５％以上必要とするため、
常圧焼結によシ得られる磁石特性には限界がありた。さ
らにＲ−Ｆｅ−Ｂ系磁石の常圧焼結は９００〜１２００
℃という高温で行なわれるため。In addition, in the case of pressureless sintering, in order to obtain sufficient densification, the liquid phase component needs to be at least 5% by volume;
There are limits to the magnetic properties that can be obtained by pressureless sintering. Furthermore, pressureless sintering of R-Fe-B magnets is 900 to 1200
This is because it is carried out at a high temperature of ℃.
収縮率が大きく、焼結体表面に変質相を生ずるため１寸
法精度による歩留シにも限界がある。Since the shrinkage rate is large and an altered phase is produced on the surface of the sintered body, there is a limit to the yield achieved by one dimensional accuracy.
この焼結法によるＲ−Ｆｅ−Ｂ系永久磁石は、大気中で
極めて酸化し易い希土類元素やＦｅを含有し、特に金属
組織中にＲ富裕相が存在するため、このＲ−Ｆｅ−Ｂ系
磁石と磁気回路などの装置に組込んだ場合磁石の酸化に
よる特性の劣化、バラツキが生ずる。又、磁石よシ発生
する酸化物の飛散による周辺部品への汚染の°問題があ
った。これら耐食性改善の文献として特開昭６０−６３
９０３号公報などが挙げられる。これら文献には焼結し
て得られたＲ−Ｆｅ−Ｂ系磁石表面に耐酸化性の化成皮
膜を形成することについて述べである。しかしながら、
この文献による耐酸化性改善においても、その処理工程
中に多量の水を使用するため、処理工程中に特にＲ富裕
相が酸化する恐れがあシ耐酸化性が充分とは言い難い。The R-Fe-B permanent magnet produced by this sintering method contains rare earth elements and Fe, which are extremely easily oxidized in the atmosphere, and in particular there is an R-rich phase in the metal structure. When a magnet is incorporated into a device such as a magnetic circuit, oxidation of the magnet causes deterioration and variation in characteristics. Additionally, there was the problem of contamination of surrounding parts due to scattering of oxides generated by the magnet. As a document on improving corrosion resistance, JP-A-60-63
For example, Publication No. 903 may be mentioned. These documents describe the formation of an oxidation-resistant chemical conversion film on the surface of an R-Fe-B magnet obtained by sintering. however,
Even in the improvement of oxidation resistance according to this document, since a large amount of water is used during the treatment process, there is a risk that the R-rich phase in particular may be oxidized during the treatment process, and the oxidation resistance cannot be said to be sufficient.
すなわち２本来化成皮膜の持つ耐酸化性をＲ−Ｆｅ−Ｂ
系磁石に付与することは極めて困難であった。In other words, the oxidation resistance of the chemical conversion coating is R-Fe-B.
It was extremely difficult to apply it to magnets.
本発明は、これら問題点を解決するもので、その目的は
。The present invention solves these problems, and its purpose is to:
ｌ）非磁性金属結合相量の低減による特性向上の持つ耐
酸化性を付与することによる磁石の耐酸化性の向上
を実現した磁石材料を提供することにある。l) It is an object of the present invention to provide a magnet material that achieves improved oxidation resistance of a magnet by imparting the oxidation resistance that improves properties by reducing the amount of non-magnetic metal binding phase.
上記目的を達成するため９本発明はＲ−ｒｅ−Ｂ基磁性
粉末と２体積構成比で０〜１０％（０は含まず）の非磁
性金属粉末との混合粉末またはその成形体を熱間加圧成
形することを特徴とする。ここで非磁性金属は、粉末、
あるいは磁性粉末への物理及び化学的表面被覆層のいず
れでもよい。また。In order to achieve the above object, the present invention produces a mixed powder of an R-re-B-based magnetic powder and a non-magnetic metal powder of 0 to 10% (not including 0) by volume, or a molded product thereof. It is characterized by pressure molding. Here, the non-magnetic metal is powder,
Alternatively, it may be a physical or chemical surface coating layer on the magnetic powder. Also.
熱間加圧成形は、いわゆるホットプレス、熱間静水圧プ
レス、押し出しのいずれでも可能であるが。Hot pressing can be done by any of the so-called hot pressing, hot isostatic pressing, and extrusion.
製品寸法精度の点よシホットプレス、押し出しが適して
いる。In terms of product dimensional accuracy, hot press and extrusion are suitable.
すなわち２本発明では
１）非磁性金属を用いて、加圧成形することによる緻密
化の促進
２）磁性粒子を滑らかな界面で包み込むことによる磁石
の高保磁力化
３）熱間加圧成形を用いることによシ非磁性相の流動及
び磁性相の塑性変形を利用した非磁性相化成皮膜が本来
′持っている耐酸化性を磁石製品に付与することによる
耐食性の向上
以上の機能によシ製品寸法精度が高く、高い磁石特性を
有し、しかも耐酸化性に優れた磁石材料を提供すること
ができる。In other words, in the present invention, 1) using a non-magnetic metal, densification is promoted by pressure forming; 2) magnetic particles are wrapped in a smooth interface to increase the coercive force of the magnet; 3) hot pressure forming is used. In particular, the non-magnetic phase chemical conversion coating, which utilizes the flow of the non-magnetic phase and the plastic deformation of the magnetic phase, has a function that goes beyond improving corrosion resistance by imparting the oxidation resistance originally possessed to magnetic products. It is possible to provide a magnetic material with high dimensional accuracy, high magnetic properties, and excellent oxidation resistance.
本発明が適用される永久磁石材料は、一般式％式％（１
）
で示されるが、ここで式中のＲはＹを含む希土類元素の
うち、一種又は二種以上が用いられる。また（１）式に
おいて。The permanent magnet material to which the present invention is applied has the general formula % formula % (1
) Here, R in the formula is one or more rare earth elements including Y. Also, in equation (1).
０．６５≦Ｘ≦０．８５ 、０．０５≦ｙ≦０．１５．
０（ｔ≦１０である。Ｆｅの量が多すぎるとＢｒは向上
するもののＨｃは極端に低下し、少なすぎるとＢｒの低
下によ！Ｄ （ＢＨ）ｍ、ｘは減少するため、０．６５
≦Ｘ≦０．８５とした。Ｂは磁石特性の向上に著しい効
果をもたらすが、０．１５を越えると特性劣化を生ずる
ため。0.65≦X≦0.85, 0.05≦y≦0.15.
0 (t≦10. If the amount of Fe is too large, Br will improve but Hc will be extremely reduced; if it is too small, !D (BH)m,x will decrease due to the decrease in Br, so 0. 65
≦X≦0.85. B has a remarkable effect on improving the magnetic properties, but if it exceeds 0.15, the properties deteriorate.
００５≦ｙ≦０，１５とした。また非磁性金属Ｍは量が
多すぎるとＢｒの低下が著しく２本発明の目的に合わな
いため１体積構成比で０（ｔ≦１０とする。（１）式で
示される磁石材料はＲ１−ｘ−、Ｆｅ ｘＢ、の組成を
有する粉末と非磁性金属元素及び合金ＣＭ）粉末の混合
粉末、又は圧粉体を３００〜１１００℃の温度範囲にて
、５〜５０００ｋｇ／ｃｒｎ２の圧力下で熱間加圧成形
を行うことによシ製造される。ここで熱間加圧成形時の
温度を３００〜１１００℃としたのは、３００℃未満で
は成形体の充分な緻密化が図れず。005≦y≦0,15. In addition, if the amount of non-magnetic metal M is too large, the Br will drop significantly.2 This is not suitable for the purpose of the present invention, so 1 volume composition ratio is set to 0 (t≦10.The magnet material represented by formula (1) is R1- A mixed powder of a powder having the composition of Manufactured by intermittent pressure molding. Here, the temperature during hot press molding was set at 300 to 1100°C, because if the temperature is lower than 300°C, sufficient densification of the molded product cannot be achieved.
１１００℃以上ではＲ−Ｆｅ−Ｂ基磁性粒子の粒成長、
及びこの磁性相と非磁性元素又は合金との反応が顕著と
なり良好な磁石特性が得られないためである。At 1100°C or higher, grain growth of R-Fe-B based magnetic particles,
This is because the reaction between this magnetic phase and the non-magnetic element or alloy becomes significant, making it impossible to obtain good magnetic properties.
また、熱間加圧成形圧力は５ｋｇ／ａｙ＋２未満では成
形体の充分な緻密化が図れないため５ｋｖｃｒｎ２以上
とする必要がある。さらに、上記製法によシ製造された
磁石材料に耐酸化性を付与するために、化成処理を行う
。この化成処理は従来の工業上で用いている方法を用い
ればよく、リン酸亜鉛、リン酸マンガン等のリン酸塩処
理、クロム酸塩処理等の化成処理でよい。この化成被膜
の膜厚は、膜強度。Further, if the hot pressing pressure is less than 5 kg/ay+2, sufficient densification of the molded product cannot be achieved, so it is necessary to set it to 5 kvcrn2 or more. Furthermore, in order to impart oxidation resistance to the magnet material manufactured by the above manufacturing method, a chemical conversion treatment is performed. This chemical conversion treatment may be performed by a conventional method used in industry, and may be a chemical conversion treatment such as a phosphate treatment using zinc phosphate or manganese phosphate, or a chromate treatment. The film thickness of this chemical conversion film is the film strength.
コスト面、耐食性の面よりリン酸塩皮膜の場合は５〜１
０μｍが好ましく、クロム酸塩処理の場合は１〜５μｍ
が好ましい。In the case of phosphate film, it is 5 to 1 in terms of cost and corrosion resistance.
0 μm is preferred, 1-5 μm in case of chromate treatment
is preferred.
また、これら化゛底皮膜の上に、樹脂等のコーティング
を行うことも可能である。Furthermore, it is also possible to coat the bottom film with a resin or the like.
以下、その実施例について述べる。Examples thereof will be described below.
〈実施例−１〉
純度９５％以上のＮｄ−Ｆｅ−Ｂを用いて、アルゴン雰
囲気中で高周波加熱によ＃）Ｎｄ、３Ｆｅ８．Ｂ６の組
成を有するＮｄ２Ｆｅ１４Ｂ相を主相とするインゴット
を得た。<Example-1> Using Nd-Fe-B with a purity of 95% or more, Nd, 3Fe8. An ingot having a main phase of Nd2Fe14B having a composition of B6 was obtained.
次に、このインゴットを粗粉砕した後？−ルミルを用い
て、平均粒子径的４μｍに湿式粉砕した。この粗粉末に
純度９９．９％以上のｋｌ粉末を５Ｆｅ１％の比率で加
え、？−ルミルにて均一分散混合した。Next, after coarsely crushing this ingot? - Wet pulverization to an average particle size of 4 μm using Lumil. KL powder with a purity of 99.9% or more is added to this coarse powder at a ratio of 5Fe1%, and ? - Uniformly dispersed and mixed using Lumil.
得られた微粉末を２０ ｋＯｅ磁界中にて１． Ｏｔ／
ｃｍ２の圧力で成形後、真空中６００℃前後の温度下で
１、ｏ ｔ７ｃｖ？の圧力で１５分間ホットプレスした
。次に、上記方法により得られた磁石材料より］、 Ｏ
＋ｏ＋Ｘ １０＋ｏ＋Ｘ８＋ｍの試験片を切り出し、リ
ン酸マンガ゛ン、リン酸亜鉛、クロム酸塩処理を行った
。The obtained fine powder was heated in a 20 kOe magnetic field for 1. Ot/
After molding at a pressure of cm2, it was molded in a vacuum at a temperature of around 600°C for 1,000 t7cv? Hot pressing was carried out for 15 minutes at a pressure of . Next, from the magnet material obtained by the above method], O
+o+X 10+o+X8+m test pieces were cut out and treated with manganese phosphate, zinc phosphate, and chromate.
これら化成処理膜の膜厚を測定したところリン酸マンガ
ンで５〜７μｍ 、 ＩＪン酸亜鉛で５〜９μｍ。The thickness of these chemically treated films was measured and was 5 to 7 μm for manganese phosphate and 5 to 9 μm for IJ zinc phosphate.
クロム酸塩で２〜４μｍであった。この試験片及び比較
のために上記ホットプレスにて得られた試料（リン酸塩
処理なし）と焼結法により得られたＮｄ １ｓＦ８７８
Ｂ ７の組成を有する焼結磁石にリン酸マンガン処理
した試験片の磁石特性及びこれら試験片を、 ５Ｓ−４
１板にアラルダイトＡＶ−１３８（主剤）。It was 2 to 4 μm for chromate. This test piece, the sample obtained by the above hot press (no phosphate treatment) for comparison, and Nd 1sF878 obtained by the sintering method.
5S-4
Araldite AV-138 (base ingredient) on one plate.
ＨＶ−９９８（硬化剤）（いずれも商品名）を用いて接
着した後、剪断加圧試験による接着強度試験結果を第−
表に示す。またこれら試験片を３時間の５％塩水噴霧試
験（ＪＩＳ−Ｚ−２３７１”） した結果を第二衣に示
す◇
以下余日
第−表、第二衣によシ９本発明による磁石は。After bonding using HV-998 (curing agent) (both trade names), the results of the adhesive strength test by shear pressure test were
Shown in the table. In addition, these test pieces were subjected to a 5% salt spray test (JIS-Z-2371'') for 3 hours, and the results are shown in Table 2.
耐酸化性に優れておシ、さらに高い磁石特性を有してい
ることがわかる。It can be seen that it has excellent oxidation resistance and even higher magnetic properties.
以上述べたように２本発明によれば、 Ｒ２Ｆｅ１４Ｂ
相を主相とする磁性粉末と、非磁性金属粉末よシ得られ
る混合粉末又は圧粉体を熱間加−圧成形を行い得られる
磁石に、耐酸化性に優れた化成処理を行うことによフ従
来の焼結法によシ得られるＲ−Ｆｅ−Ｂ系磁石よりも高
い磁石特性を有し耐酸化性に優れた永久磁石を得ること
ができる。As described above, according to the present invention, R2Fe14B
By hot-pressing a mixed powder or green compact obtained from a magnetic powder whose main phase is magnetic powder and a non-magnetic metal powder, a chemical conversion treatment with excellent oxidation resistance is applied to the magnet obtained. It is possible to obtain a permanent magnet with higher magnetic properties and excellent oxidation resistance than R-Fe-B magnets obtained by conventional sintering methods.
さらに、従来の焼結法に比べ低温で成形体の緻密化が図
れ製品寸法精度向上が実現できるため。Furthermore, compared to conventional sintering methods, it is possible to densify the compact at a lower temperature and improve product dimensional accuracy.
工業上きわめて有益である。It is extremely useful industrially.
Claims (1)
含む希土類元素）、５〜１５％のＢ、残部Ｆｅより成る
合金粉末と、体積構成比で０〜１０％（０は含まず）の
非磁性元素Ｍの粉末との混合粉末またはその成形体を３
００〜１１００℃の温度下で、熱間加圧成形して得られ
るＲ＿２Ｆｅ＿１＿４Ｂ−Ｍ系永久磁石（ＭはＺｎ、Ａ
ｌ、Ｓ、Ｉｎ、Ｇａ、Ｇｅ、Ｓｎ、Ｔｅ、Ｃｕ、Ｐｂの
一種又は二種以上の元素、又はこれら元素間の化合物、
これら元素と希土類元素との合金、及びこれら元素とＢ
との合金を示す。）の表面に耐酸化性化成皮膜を被覆し
てなることを特徴とする希土類−鉄系永久磁石。(1) An alloy powder consisting of 10 to 20% R (here R is a rare earth element including Y) in atomic percentage, 5 to 15% B, and the balance Fe, and 0 to 10% in volume composition ratio (0 is Mixed powder with powder of non-magnetic element M (not containing) or a molded product thereof
R_2Fe_1_4B-M permanent magnet (M is Zn, A
one or more elements of l, S, In, Ga, Ge, Sn, Te, Cu, Pb, or a compound between these elements,
Alloys of these elements and rare earth elements, and these elements and B
It shows the alloy with. ) A rare earth-iron permanent magnet characterized by having its surface coated with an oxidation-resistant chemical conversion film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61099753A JP2546989B2 (en) | 1986-04-30 | 1986-04-30 | Permanent magnet with excellent oxidation resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61099753A JP2546989B2 (en) | 1986-04-30 | 1986-04-30 | Permanent magnet with excellent oxidation resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62256412A true JPS62256412A (en) | 1987-11-09 |
| JP2546989B2 JP2546989B2 (en) | 1996-10-23 |
Family
ID=14255746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61099753A Expired - Fee Related JP2546989B2 (en) | 1986-04-30 | 1986-04-30 | Permanent magnet with excellent oxidation resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2546989B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005043558A1 (en) * | 2003-10-31 | 2005-05-12 | Tdk Corporation | Method for producing sintered rare earth element magnet |
| JP2007173501A (en) * | 2005-12-22 | 2007-07-05 | Hitachi Ltd | Pressed powder magnet and rotating machine using it |
| EP1970924A1 (en) * | 2007-03-16 | 2008-09-17 | Shin-Etsu Chemical Co., Ltd. | Rare earth permanent magnets and their preparation |
| US7883587B2 (en) | 2006-11-17 | 2011-02-08 | Shin-Etsu Chemical Co., Ltd. | Method for preparing rare earth permanent magnet |
| US7955443B2 (en) | 2006-04-14 | 2011-06-07 | Shin-Etsu Chemical Co., Ltd. | Method for preparing rare earth permanent magnet material |
| US8211327B2 (en) | 2004-10-19 | 2012-07-03 | Shin-Etsu Chemical Co., Ltd. | Preparation of rare earth permanent magnet material |
| US8231740B2 (en) | 2006-04-14 | 2012-07-31 | Shin-Etsu Chemical Co., Ltd. | Method for preparing rare earth permanent magnet material |
| US8420010B2 (en) | 2006-04-14 | 2013-04-16 | Shin-Etsu Chemical Co., Ltd. | Method for preparing rare earth permanent magnet material |
| JP2019096868A (en) * | 2017-11-24 | 2019-06-20 | Tdk株式会社 | Magnet and motor using the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6063903A (en) * | 1983-09-16 | 1985-04-12 | Sumitomo Special Metals Co Ltd | Permanent magnet superior in resistance to oxidation |
| JPS60100402A (en) * | 1983-08-04 | 1985-06-04 | ゼネラル モ−タ−ズ コ−ポレ−シヨン | Iron-rare earth element-boron permanent magnet by high temperature heat treatment |
-
1986
- 1986-04-30 JP JP61099753A patent/JP2546989B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60100402A (en) * | 1983-08-04 | 1985-06-04 | ゼネラル モ−タ−ズ コ−ポレ−シヨン | Iron-rare earth element-boron permanent magnet by high temperature heat treatment |
| JPS6063903A (en) * | 1983-09-16 | 1985-04-12 | Sumitomo Special Metals Co Ltd | Permanent magnet superior in resistance to oxidation |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005043558A1 (en) * | 2003-10-31 | 2005-05-12 | Tdk Corporation | Method for producing sintered rare earth element magnet |
| US8377233B2 (en) | 2004-10-19 | 2013-02-19 | Shin-Etsu Chemical Co., Ltd. | Preparation of rare earth permanent magnet material |
| US8211327B2 (en) | 2004-10-19 | 2012-07-03 | Shin-Etsu Chemical Co., Ltd. | Preparation of rare earth permanent magnet material |
| JP4719568B2 (en) * | 2005-12-22 | 2011-07-06 | 日立オートモティブシステムズ株式会社 | Powder magnet and rotating machine using the same |
| JP2007173501A (en) * | 2005-12-22 | 2007-07-05 | Hitachi Ltd | Pressed powder magnet and rotating machine using it |
| US8231740B2 (en) | 2006-04-14 | 2012-07-31 | Shin-Etsu Chemical Co., Ltd. | Method for preparing rare earth permanent magnet material |
| US7955443B2 (en) | 2006-04-14 | 2011-06-07 | Shin-Etsu Chemical Co., Ltd. | Method for preparing rare earth permanent magnet material |
| US8420010B2 (en) | 2006-04-14 | 2013-04-16 | Shin-Etsu Chemical Co., Ltd. | Method for preparing rare earth permanent magnet material |
| US7883587B2 (en) | 2006-11-17 | 2011-02-08 | Shin-Etsu Chemical Co., Ltd. | Method for preparing rare earth permanent magnet |
| US7985303B2 (en) | 2007-03-16 | 2011-07-26 | Shin-Etsu Chemical Co., Ltd. | Rare earth permanent magnet and its preparation |
| EP1970924A1 (en) * | 2007-03-16 | 2008-09-17 | Shin-Etsu Chemical Co., Ltd. | Rare earth permanent magnets and their preparation |
| US8025744B2 (en) | 2007-03-16 | 2011-09-27 | Shin-Etsu Chemical Co., Ltd. | Rare earth permanent magnet and its preparation |
| US8252123B2 (en) | 2007-03-16 | 2012-08-28 | Shin-Etsu Chemical Co., Ltd. | Rare earth permanent magnet and its preparation |
| US8277578B2 (en) | 2007-03-16 | 2012-10-02 | Shin-Etsu Chemical Co., Ltd. | Rare earth permanent magnet and its preparation |
| US8557057B2 (en) | 2007-03-16 | 2013-10-15 | Shin-Etsu Chemical Co., Ltd. | Rare earth permanent magnet and its preparation |
| JP2019096868A (en) * | 2017-11-24 | 2019-06-20 | Tdk株式会社 | Magnet and motor using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2546989B2 (en) | 1996-10-23 |
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