JPS6398107A - Manufacture of rare earth permanent magnet - Google Patents
Manufacture of rare earth permanent magnetInfo
- Publication number
- JPS6398107A JPS6398107A JP61243214A JP24321486A JPS6398107A JP S6398107 A JPS6398107 A JP S6398107A JP 61243214 A JP61243214 A JP 61243214A JP 24321486 A JP24321486 A JP 24321486A JP S6398107 A JPS6398107 A JP S6398107A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- permanent magnet
- rare earth
- powder
- fine powder
- 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
- 229910052761 rare earth metal Inorganic materials 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 150000002910 rare earth metals Chemical class 0.000 title claims description 6
- 239000000843 powder Substances 0.000 claims abstract description 41
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 13
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 239000001301 oxygen Substances 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 23
- 238000010298 pulverizing process Methods 0.000 claims description 9
- 238000004663 powder metallurgy Methods 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910052796 boron Inorganic materials 0.000 claims description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- 229910001122 Mischmetal Inorganic materials 0.000 claims 1
- 229910000521 B alloy Inorganic materials 0.000 abstract description 18
- 230000003647 oxidation Effects 0.000 abstract description 14
- 238000007254 oxidation reaction Methods 0.000 abstract description 14
- 239000002245 particle Substances 0.000 abstract description 11
- 239000012188 paraffin wax Substances 0.000 abstract description 5
- 238000005245 sintering Methods 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000004570 mortar (masonry) Substances 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- JXSRRBVHLUJJFC-UHFFFAOYSA-N 7-amino-2-methylsulfanyl-[1,2,4]triazolo[1,5-a]pyrimidine-6-carbonitrile Chemical compound N1=CC(C#N)=C(N)N2N=C(SC)N=C21 JXSRRBVHLUJJFC-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- -1 iron group transition metal Chemical group 0.000 description 1
- 238000010902 jet-milling Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 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 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
- AQZPUBZHEJUBCF-UHFFFAOYSA-L zinc;hydrogen phosphate;octadecanoic acid Chemical compound [Zn+2].OP([O-])([O-])=O.CCCCCCCCCCCCCCCCCC(O)=O AQZPUBZHEJUBCF-UHFFFAOYSA-L 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/061—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder with a protective layer
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、酸化され易い希土類元素（Ｙを含む、以下同
じ）を含む希土類永久磁石用合金粉末を粉末冶金法で永
久磁石に作製する方法の改良に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for producing a permanent magnet using a powder metallurgy method from a rare earth alloy powder for a permanent magnet containing an easily oxidized rare earth element (including Y, the same applies hereinafter). This is related to the improvement of.
希土類永久磁石の中で、希土類元素、鉄およびホウ素を
必須元素とする合金（以下、Ｒ−Ｆｅ−Ｂ合金という）
は高価なＣｏを必須成分とせず、かつ安価なＦｅおよび
Ｂを多量に使用できるため、従来の高性能磁石の代表で
あった希土類−コバルト磁石より原料コストが安価であ
り、しかも希土類−コバルト磁石を稜ぐ高性能が期待で
きるため、その実用化に向かっての研究が活発に為され
ている。Among rare earth permanent magnets, alloys containing rare earth elements, iron, and boron as essential elements (hereinafter referred to as R-Fe-B alloy)
Because it does not require expensive Co as an essential component and can use large amounts of inexpensive Fe and B, the raw material cost is lower than that of rare earth-cobalt magnets, which have been typical of conventional high-performance magnets, and rare earth-cobalt magnets Since it is expected to have high performance that exceeds the above, research is being actively conducted toward its practical application.
Ｒ−Ｆｅ−Ｂ合金磁石の製造方法の一つに粉末冶金法が
ある。この方法では、一般に合金を溶製し、造塊した後
、得られたインゴットを粗粉砕および微粉砕し、最終的
には平均粒径が数μｍの微粉末とする段階が実施される
。かくして得られた微粉末は各種用途に合わせた形状に
成型された後に、焼結、時効等の工程を経て、永久磁石
となる。One of the methods for manufacturing R-Fe-B alloy magnets is a powder metallurgy method. In this method, the alloy is generally melted and agglomerated, and then the obtained ingot is coarsely and finely crushed to finally form a fine powder with an average particle size of several μm. The fine powder thus obtained is molded into a shape suitable for various uses, and then undergoes processes such as sintering and aging to become a permanent magnet.
Ｒ−Ｆｅ−Ｂ合金は非常に酸化し易く、酸化により磁気
特性は劣化するため、パラフィン等の表面被覆剤を微粉
砕粉末と混合したり、あるいは成型時の潤滑剤であるス
テアリン酸亜鉛などを微粉砕粉末と混合するなどの工夫
により微粉末の酸化を妨げる手段が一般に採用されてい
る。しかしながら、これらの手段による処理を経て製造
されたＲ−Ｆｅ−Ｂ合金磁石には次のような問題がある
ことに本発明者らは着目した。R-Fe-B alloy is very easily oxidized, and its magnetic properties deteriorate due to oxidation. Therefore, surface coating agents such as paraffin are mixed with finely ground powder, or zinc stearate, which is a lubricant during molding, is used. Generally, measures are taken to prevent oxidation of the fine powder, such as by mixing it with finely ground powder. However, the inventors of the present invention have noticed that R-Fe-B alloy magnets manufactured through treatments using these methods have the following problems.
（１）活性な表面の単位重量当たりの割合が極めて大で
ある微粉の状態でＲ−Ｆｅ−Ｂ合金とパラフィン、ステ
アリン酸亜鉛などとを混合するために、混合前に既にか
なり酸化が進行しているか且／または混合中に酸化が進
行することに起因して、製品の酸素含有量がかなり高く
なる。かかる製品の酸素含有量を低くすると磁気特性の
向上が期待できる。(1) Because the R-Fe-B alloy is mixed with paraffin, zinc stearate, etc. in the form of fine powder with an extremely large proportion of active surface per unit weight, oxidation has already progressed considerably before mixing. Due to the oxidation that occurs during mixing and/or mixing, the oxygen content of the product can be quite high. If the oxygen content of such products is lowered, the magnetic properties can be expected to improve.
（２）パラフィン、ステアリン酸亜鉛などと微粉砕粉末
を混合するという工程が通常の粉末冶金工程に附加され
る。(2) A step of mixing finely ground powder with paraffin, zinc stearate, etc. is added to the normal powder metallurgy process.
本発明は、上記した問題点を効果的に解決すべく、合金
粗粉材に酸化防止有機剤を混合し、微粉砕を行なうこと
を特徴とし、その後通常の粉末冶金法により、酸素量が
少なくかつ磁気特性が優れた永久磁石を得る希土類永久
磁石の製造方法である。In order to effectively solve the above-mentioned problems, the present invention is characterized by mixing an antioxidant organic agent into a coarse alloy powder material and pulverizing it, and then using a normal powder metallurgy method to reduce the amount of oxygen. The present invention also provides a method for producing a rare earth permanent magnet, which provides a permanent magnet with excellent magnetic properties.
本発明において、合金粗粉材および微粉材は従来、それ
ぞれ、ディスクミル、およびジェットミルにより粉砕さ
れる平均粒径のものを指し、合金粗粉材の典型的平均粒
径は３０〜６０メソシユアンダーであり、微粉の典型的
平均粒径ば１〜１０μｍである。上記合金粗粉材の平均
粒径では、単位重量当たりの比表面積が小さいため、通
常の方法で粉砕しても酸化は少ない。かかる合金粗粉材
と酸化防止有機剤とを乳鉢あるいは混合攪拌機で混合す
るなどの方法で配合し、さらに微粉砕を行なうと、微粉
砕中に酸化防止有機剤が粉末中に均一に混合されまた微
粉末の個々の粒子は表面被覆剤などにより被覆される。In the present invention, alloy coarse powder material and fine powder material refer to average particle diameters that are conventionally pulverized by a disk mill and a jet mill, respectively, and the typical average particle diameter of alloy coarse powder material is 30 to 60 mesos. The typical average particle size of the fine powder is 1 to 10 μm. Since the average particle size of the above alloy coarse powder material has a small specific surface area per unit weight, oxidation is small even if it is pulverized by a normal method. When the alloy coarse powder material and the antioxidant organic agent are mixed in a mortar or mixer, and then finely pulverized, the antioxidant organic agent is uniformly mixed into the powder during the pulverization. The individual particles of fine powder are coated with a surface coating agent or the like.
酸化防止有機剤としては、従来表面被覆剤として使用さ
れているパラフィンなど、酸化からＲ−Ｆｅ−Ｂ合金を
保護し、成型工程では金型と成型体の摩擦を低減する作
用をし、焼結工程では揮散する有機物質を用いることが
できる。また従来離型剤として使用されているステアリ
ン酸亜鉛、ステアリン酸銅などを使用する事ができる。Antioxidant organic agents, such as paraffin, which is conventionally used as a surface coating agent, protect the R-Fe-B alloy from oxidation, reduce friction between the mold and the molded body during the molding process, and reduce the friction between the mold and the molded body during the sintering process. Organic substances that volatilize can be used in the process. Furthermore, zinc stearate, copper stearate, etc., which are conventionally used as mold release agents, can be used.
なお、これらに限らず、成型中の粉末の流動、充填の障
害とならないバルチメン酸などの有機物質を使用するこ
ともできる。Note that the present invention is not limited to these, and organic substances such as bartimenic acid that do not interfere with powder flow and filling during molding may also be used.
Ｒ−Ｆｅ−Ｂ合金と酸化防止有機剤との配合量割合は特
に制限がないが、前者が多すぎると酸化防止の効果がな
く、一方後者が多すぎると成型工程に悪影響があり、ま
た燃焼ガスの処理が厄介になるため、適当なる配合量比
に調節する。その−例は、Ｒ−Ｆｅ−Ｂ合金１００重量
部に対して酸化防止有機剤を０．００１〜０．２重量部
である。There is no particular limit to the blending ratio of the R-Fe-B alloy and the antioxidant organic agent, but too much of the former will have no oxidation prevention effect, while too much of the latter will have a negative impact on the molding process and may cause combustion. Since gas treatment becomes difficult, adjust the blending ratio to an appropriate level. An example thereof is 0.001 to 0.2 parts by weight of the antioxidant organic agent per 100 parts by weight of the R-Fe-B alloy.
Ｒ−Ｆｅ−Ｂ合金の組成は、本発明においては、何等制
限されない。即ち、永久磁石として有用な磁気的性質を
具備するに足る程度の希土類元素を含み、このために易
酸化性を帯びるあらゆるＲ−Ｆｅ−Ｂ合金に本発明法が
適用できる。その組成の一具体例を示すと、５〜３５％
Ｒ１５０〜９３％Ｆｅ。The composition of the R-Fe-B alloy is not limited in any way in the present invention. That is, the method of the present invention can be applied to any R-Fe-B alloy that contains rare earth elements in an amount sufficient to provide magnetic properties useful as a permanent magnet and is therefore easily oxidized. A specific example of its composition is 5 to 35%
R150-93% Fe.
２〜１５％Ｂであり、Ｆｅは鉄族遷位金属で置換可能で
あり、また添加元素として、Ｖ、Ｔａ、Ｗ。2 to 15% B, Fe can be replaced with iron group transition metal, and additional elements include V, Ta, and W.
Ｎｂ 、Ｍｏ 、Ｃｒ 、Ｔｉ 、Ｈｆ 、
Ｎｉ 、Ｓｎ 、Ｚｒ。Nb, Mo, Cr, Ti, Hf,
Ni, Sn, Zr.
Ｍｎ 、Ｇｅ 、Ｂｉなどを適当量添加する組成例も
可能である。希土類元素としては、Ｎｄを始めとしてあ
らゆる元素を用いることができるが、特にミツシュメタ
ルを用いたＲ−Ｆｅ−Ｂ合金に本発明法を適用すると酸
化防止の効果が大きく、著しい磁気特性の改良がある。A composition example in which appropriate amounts of Mn, Ge, Bi, etc. are added is also possible. As the rare earth element, any element including Nd can be used, but especially when the method of the present invention is applied to the R-Fe-B alloy using Mitsushi metal, the effect of preventing oxidation is large and the magnetic properties are significantly improved. .
微粉砕後の工程は通常の粉末冶金工程であり、本発明が
特徴とするところではない。唯、この工程は酸化防止有
機剤を揮散させるために、本発明において必須の工程で
ある。The process after pulverization is a normal powder metallurgy process and is not a feature of the present invention. However, this step is an essential step in the present invention in order to volatilize the antioxidant organic agent.
Ｒ−Ｆｅ−Ｂ合金の粗粉と表面被覆剤などを混合しなが
ら微粉砕すると、微粉砕工程で表面被覆剤などが粉末の
表面を被覆して空気による酸化の進行を妨げ、酸化され
易い微粉が多くなるにともなって表面被覆剤が粉末をよ
り密に被覆し、表面が活性な微粉状態でのＲ−Ｆｅ−Ｂ
系合金と表面被覆剤との混合のだめの工程が省略され、
これらの作用によって、焼結磁石中の酸素量が少なくな
りそして磁気特性が向上する。When coarse powder of R-Fe-B alloy is mixed with a surface coating agent and pulverized, the surface coating agent coats the surface of the powder during the pulverization process and prevents the progress of oxidation by air, resulting in a fine powder that is easily oxidized. As the amount of R-Fe-B increases, the surface coating agent coats the powder more densely, and the R-Fe-B in the fine powder state with active surface
The process of mixing the alloy and surface coating agent is omitted.
These effects reduce the amount of oxygen in the sintered magnet and improve its magnetic properties.
以下、実施例によりさらに具体的に本発明を説明する。Hereinafter, the present invention will be explained in more detail with reference to Examples.
（実施例〕
実施例Ｉ
Ｎｄ ＋ Ｊ７Ｆｅ７６の組成を有する合金を溶製した
後、造塊し、得られたインゴットを３２メソシユ以下の
粒度まで粗粉砕を行なった。得られた粗粉に対して０．
０５重量％のステア−リン酸亜鉛をＮ２ガス雰囲気で混
合、攪拌した後、ジェット・ミル粉砕を行ない、平均粒
径が４μｍの微粉を得た。(Example) Example I After melting an alloy having a composition of Nd + J7Fe76, it was ingot-formed, and the obtained ingot was coarsely ground to a particle size of 32 mesosinus or less. 0.
After mixing and stirring 0.5% by weight of zinc stearate phosphate in an N2 gas atmosphere, jet milling was performed to obtain fine powder with an average particle size of 4 μm.
この微粉を１０ｋＯｅの磁場中で１，５ｔｏｎ／ｃｍｌ
の圧力で圧粉した後、１１００℃、２時間、Ａｒガス雰
囲気中で焼結し、続いて６００℃、１時間で時効処理を
行なった（試料Ａ）。This fine powder was heated to 1.5 ton/cm in a 10 kOe magnetic field.
The powder was compacted at a pressure of 1,100° C. for 2 hours in an Ar gas atmosphere, and then aged at 600° C. for 1 hour (Sample A).
比較例１
実施例１で得られた３２メツシユ以下の粗粉をジェット
・ミル粉砕して、平均粒径が４μｍの微粉を得た。得ら
れた微粉に対して０．０５重量％のステアアリン酸亜鉛
をＮ２ガス雰囲気で混合、撹拌した後、実施例１と同じ
条件で磁場中成形、焼結、時効を行なった（試料Ｂ）。Comparative Example 1 The coarse powder of 32 meshes or less obtained in Example 1 was pulverized with a jet mill to obtain a fine powder with an average particle size of 4 μm. After mixing and stirring 0.05% by weight of zinc stearate with respect to the obtained fine powder in an N2 gas atmosphere, molding in a magnetic field, sintering, and aging were performed under the same conditions as in Example 1 (Sample B).
実施例２
組成が（（Ｃｅｏ、 ｔＬａｏ、 ａ） ｏ、 ｓ （
Ｎｄｏ、 ｂｓＰｒｏ、 ＋ ５Ｄｙｏ、 ｚ） ｏ、
ｓ）ｏ、 ＋ ７ （（Ｆｅ０． ｑ、Ａｌｏ、 ０
３） ０．９２Ｂ０．０８） ０．８３である合金を実
施例１と同じ方法で平均粒径が４μｍのｉａ粉にした。Example 2 The composition is ((Ceo, tLao, a) o, s (
Ndo, bsPro, +5Dyo, z) o,
s) o, + 7 ((Fe0. q, Alo, 0
3) 0.92B0.08) 0.83 alloy was made into IA powder with an average particle size of 4 μm in the same manner as in Example 1.
この微粉を１０ｋＯｅの磁場中でｌ、 ５ ｔｏｎ／
ａ＋ｌの圧力で圧粉した後、１０７０℃、２時間、Ａｒ
ガス雰囲気中で焼結し、続いて６００’Ｃ１１時間で時
効処理を行なった（試料Ｃ）。This fine powder was heated in a magnetic field of 10 kOe at 1,5 ton/
After compacting with a pressure of a + l, Ar
It was sintered in a gas atmosphere and then aged at 600'C for 11 hours (Sample C).
比較例２
実施例２の粗粉を比較例１と同様に微粉にし、得られた
微粉に対して０．０５重量％のステア；リン酸亜鉛をＮ
２ガス雰囲気で混合、攪拌した後、実施例２と同じ条件
で磁場中成形、焼結、時効を行なった（試料Ｄ）。Comparative Example 2 The coarse powder of Example 2 was made into fine powder in the same manner as Comparative Example 1, and 0.05% by weight of stare was added to the resulting fine powder; zinc phosphate was added with N
After mixing and stirring in a two-gas atmosphere, molding in a magnetic field, sintering, and aging were performed under the same conditions as in Example 2 (Sample D).
試料Ａ〜Ｄの磁気特性および焼結体中の酸素量を表１に
示す。Table 1 shows the magnetic properties of samples A to D and the amount of oxygen in the sintered bodies.
表 １
表１に示すように、本発明の実施例では製品の酸素量が
少なくなる。唯、微粉砕前の酸化、微粉砕中の若干の酸
化、および粉末冶金工程での酸化が避けられないため、
製品の酸素量が痕跡量になっているのではない。それに
も拘わらず、保磁力（ｉＨｃ）および最大エネルギ積（
ＢＨ）、、、の向上はＮｄ系Ｒ−Ｆｅ−Ｂ合金磁石およ
びミ’７シユメタル系Ｒ−Ｆｅ−Ｂ合金磁石の両者で顕
著である。Table 1 As shown in Table 1, in the examples of the present invention, the amount of oxygen in the product is reduced. However, oxidation before pulverization, some oxidation during pulverization, and oxidation during the powder metallurgy process are unavoidable.
The amount of oxygen in the product is not a trace amount. Nevertheless, the coercive force (iHc) and the maximum energy product (
The improvement in BH) is remarkable for both the Nd-based R-Fe-B alloy magnet and the Mi'7 metal-based R-Fe-B alloy magnet.
本発明によると、Ｒ−Ｆｅ−Ｂ合金磁石の製品酸素量を
簡筆かつ確実な手段で低減するとともに、磁気特性の顕
著な向上を達成できる。このためのコスト増要因は殆ど
なく、却って微粉末と表面被覆剤との混合を省略するこ
とによるコスト低減が期待できる。よって、本発明は、
Ｒ−Ｆｅ−Ｂ合金磁石の弱点である酸化による磁気特性
劣化を軽減する点で工業的に有意義である。According to the present invention, it is possible to reduce the amount of oxygen in a product of an R-Fe-B alloy magnet by a simple and reliable means, and to achieve a remarkable improvement in magnetic properties. There is almost no cost increase factor for this, and on the contrary, cost reduction can be expected by omitting the mixing of the fine powder and the surface coating agent. Therefore, the present invention
It is industrially significant in that it reduces deterioration of magnetic properties due to oxidation, which is a weak point of R-Fe-B alloy magnets.
Claims (1)
素とする合金を粗粉砕および微粉砕して、粉末冶金法に
より永久磁石を製造する方法において、合金粗粉材に酸
化防止有機剤を配合して微粉砕を行ない、その後通常の
粉末冶金法により、酸素量が少なくかつ磁気特性が優れ
た永久磁石を得ることを特徴とする希土類永久磁石の製
造方法。 ２、希土類元素がミッシュメタルである特許請求の範囲
第１項記載の希土類永久磁石の製造方法。[Claims] 1. In a method for manufacturing a permanent magnet by a powder metallurgy method by coarsely pulverizing and finely pulverizing an alloy containing rare earth elements (including Y), iron and boron as essential elements, an alloy coarse powder material A method for producing a rare earth permanent magnet, which comprises blending an antioxidant organic agent into finely pulverizing the mixture and then using a normal powder metallurgy method to obtain a permanent magnet with a low oxygen content and excellent magnetic properties. 2. The method for producing a rare earth permanent magnet according to claim 1, wherein the rare earth element is a misch metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61243214A JP2682619B2 (en) | 1986-10-15 | 1986-10-15 | Manufacturing method of rare earth permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61243214A JP2682619B2 (en) | 1986-10-15 | 1986-10-15 | Manufacturing method of rare earth permanent magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6398107A true JPS6398107A (en) | 1988-04-28 |
| JP2682619B2 JP2682619B2 (en) | 1997-11-26 |
Family
ID=17100522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61243214A Expired - Lifetime JP2682619B2 (en) | 1986-10-15 | 1986-10-15 | Manufacturing method of rare earth permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2682619B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006310797A (en) * | 2005-03-30 | 2006-11-09 | Tdk Corp | Process for producing rare earth permanent magnet |
| JP2006310786A (en) * | 2005-03-28 | 2006-11-09 | Tdk Corp | Process for producing rare earth permanent magnet and method for mixing material powder and lubricant |
| CN112413023A (en) * | 2020-11-20 | 2021-02-26 | 贵州新安航空机械有限责任公司 | Processing method of sheet powder metallurgy brake disc |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6134101A (en) * | 1984-07-25 | 1986-02-18 | Sumitomo Special Metals Co Ltd | Molding improving agent of alloy powder for permanent magnet |
-
1986
- 1986-10-15 JP JP61243214A patent/JP2682619B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6134101A (en) * | 1984-07-25 | 1986-02-18 | Sumitomo Special Metals Co Ltd | Molding improving agent of alloy powder for permanent magnet |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006310786A (en) * | 2005-03-28 | 2006-11-09 | Tdk Corp | Process for producing rare earth permanent magnet and method for mixing material powder and lubricant |
| JP4716020B2 (en) * | 2005-03-28 | 2011-07-06 | Ｔｄｋ株式会社 | Method for producing rare earth permanent magnet and method for mixing raw material powder and lubricant |
| JP2006310797A (en) * | 2005-03-30 | 2006-11-09 | Tdk Corp | Process for producing rare earth permanent magnet |
| CN112413023A (en) * | 2020-11-20 | 2021-02-26 | 贵州新安航空机械有限责任公司 | Processing method of sheet powder metallurgy brake disc |
| CN112413023B (en) * | 2020-11-20 | 2022-11-08 | 贵州新安航空机械有限责任公司 | Processing method of thin sheet powder metallurgy brake disc |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2682619B2 (en) | 1997-11-26 |
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