JP2915560B2 - Manufacturing method of rare earth iron-based permanent magnet - Google Patents
Manufacturing method of rare earth iron-based permanent magnetInfo
- Publication number
- JP2915560B2 JP2915560B2 JP2323799A JP32379990A JP2915560B2 JP 2915560 B2 JP2915560 B2 JP 2915560B2 JP 2323799 A JP2323799 A JP 2323799A JP 32379990 A JP32379990 A JP 32379990A JP 2915560 B2 JP2915560 B2 JP 2915560B2
- Authority
- JP
- Japan
- Prior art keywords
- lubricant
- permanent magnet
- rare earth
- weight
- 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.)
- Expired - Lifetime
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 14
- 229910052761 rare earth metal Inorganic materials 0.000 title claims description 11
- 150000002910 rare earth metals Chemical class 0.000 title claims description 8
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910052742 iron Inorganic materials 0.000 title claims description 6
- 239000000843 powder Substances 0.000 claims description 26
- 239000000314 lubricant Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 21
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 229910052733 gallium Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 150000001298 alcohols Chemical class 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 229910001004 magnetic alloy Inorganic materials 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 235000021355 Stearic acid Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000008117 stearic acid Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- BXWNKGSJHAJOGX-UHFFFAOYSA-N hexadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCO BXWNKGSJHAJOGX-UHFFFAOYSA-N 0.000 description 2
- VKOBVWXKNCXXDE-UHFFFAOYSA-N icosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCC(O)=O VKOBVWXKNCXXDE-UHFFFAOYSA-N 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 235000021357 Behenic acid Nutrition 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229940116226 behenic acid Drugs 0.000 description 1
- 229960000541 cetyl alcohol Drugs 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229940012831 stearyl alcohol Drugs 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
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0576—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together pressed, e.g. hot working
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Powder Metallurgy (AREA)
- Hard Magnetic Materials (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、NdとFeを主成分とする金属化合物系磁石、
特にNd−Fe−Ｂ系希土類鉄系永久磁石の製造方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a metal compound-based magnet containing Nd and Fe as main components,
In particular, the present invention relates to a method for producing an Nd-Fe-B-based rare earth iron-based permanent magnet.
（従来の技術） 一般的にＲ−Fe−Ｂ系永久磁石は粉末冶金法によって
製造されている。粉末冶金法では、磁石合金インゴット
を数μｍの微粉に粉砕後、静磁場中で磁場配向させ、磁
場がかかった状態のままプレス成形を行なう。この場合
粉砕粉末だけでは成形時の粉末同士の摩擦や粉末と金型
壁面との摩擦により磁場中で配向していた粉末が乱れ、
配向度が低下し、磁気特性を劣化させる。また、金型面
および成形体表面に傷、むしれ、割れ等が生じ易く、品
質上および製品歩留まり上好ましくなく、この解決策と
して潤滑剤の磁石粉末表面への被覆が行なわれている。(Prior Art) Generally, R-Fe-B permanent magnets are manufactured by powder metallurgy. In the powder metallurgy method, a magnet alloy ingot is pulverized into fine powder of several μm, then oriented in a static magnetic field, and press-formed while a magnetic field is applied. In this case, the powder that has been oriented in the magnetic field is disturbed by the friction between the powders at the time of molding or the friction between the powder and the mold wall surface with only the pulverized powder,
The degree of orientation decreases, and the magnetic properties deteriorate. Further, the surface of the mold and the surface of the molded body are liable to be scratched, peeled, cracked, etc., which is not preferable in terms of quality and product yield. As a solution to this problem, a lubricant is coated on the surface of the magnet powder.
（発明が解決しようとする課題） しかしながらこの潤滑剤の磁石表面への被覆は、一般
的には湿式法にて行なわれている。即ち、潤滑剤が主と
して有機化合物であるため、溶剤としてノルマルヘキサ
ン、トルエン、弗素系溶剤等の不活性有機溶媒が使用さ
れるが、被覆される磁石粉末が活性が強く、着火し易い
ため、溶剤と反応した場合爆発または有毒ガスを発生す
る恐れがあり、作業環境の悪化、コスト高になる等の不
利がある。(Problems to be Solved by the Invention) However, the coating of the lubricant on the magnet surface is generally performed by a wet method. That is, since the lubricant is mainly an organic compound, an inert organic solvent such as normal hexane, toluene, or a fluorine-based solvent is used as a solvent. However, since the magnet powder to be coated has a strong activity and is easy to ignite, a solvent is used. When reacting with, there is a possibility that explosion or toxic gas may be generated, and there are disadvantages such as deterioration of working environment and increase in cost.
本発明はかかる問題点を解決するために有機溶剤を使
用する湿式法に代わる安全で投資のかからない簡便な潤
滑剤の被覆方法を提供しようとするものである。An object of the present invention is to provide a safe and inexpensive simple method of coating a lubricant in place of a wet method using an organic solvent in order to solve such problems.
（問題を解決するための手段） 本発明者らはかかる問題を解決するために潤滑剤の被
覆方法として乾式法を研究し、潤滑剤の添加工程、添加
量、添加方法等の条件を詳細に検討して本発明を完成さ
せた。(Means for Solving the Problem) In order to solve such a problem, the present inventors have studied a dry method as a method for coating a lubricant, and have described in detail conditions such as a lubricant adding step, an additive amount, and an adding method. After examination, the present invention was completed.
本発明の要旨は、組成式RXFe100-X-Y-ZBYMZ（但し、
ＲはNdを含む希土類元素のうち、少なくとも１種類もし
くは２種類以上の元素。ＭはAl,Co,Ga,Nb,Zrのうち少な
くとも１種類もしくは２種類以上の元素。原子百分率で
Ｘ＝10〜25％、Ｙ＝１〜20％、Ｚ＝０〜20％）からなる
永久磁石合金粗粉100重量部に対して、潤滑剤0.05重量
部以上1.0重量部以下を乾式法で添加混合した混合物を
微粉砕し、表面が潤滑剤で被覆された微粉末とした後、
磁場中で配向させながらプレス成形することを特徴とす
る希土類鉄系永久磁石の製造方法にある。The gist of the present invention is a composition formula R X Fe 100-XYZ B Y M Z (however,
R is at least one kind or two or more kinds of rare earth elements including Nd. M is at least one or more of Al, Co, Ga, Nb, and Zr. 0.05 to 1.0 parts by weight of a lubricant is dry-processed with respect to 100 parts by weight of a permanent magnet alloy coarse powder consisting of X = 10 to 25%, Y = 1 to 20%, and Z = 0 to 20% in atomic percentage. The mixture added and mixed by the method is pulverized to form a fine powder whose surface is coated with a lubricant,
The present invention relates to a method for producing a rare earth iron-based permanent magnet, which comprises performing press molding while being oriented in a magnetic field.
以下、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
先ず、本発明の対象となる磁石組成は、組成式RXFe
100-X-Y-ZBYMZで表わされるＲ−Fe−Ｂ系磁石合金で、
ＲはNdを含む希土類元素の内少なくとも１種類もしくは
２種類以上の元素、ＭはAl,Co,Ga,Nb,Zrの内少なくとも
１種類もしくは２種類以上の元素、その組成比は原子百
分率でＸ＝10〜25％、Ｙ＝１〜20％、Ｚ＝０〜20％から
なるものとする。First, the magnet composition that is the object of the present invention has the composition formula R X Fe
R-Fe-B magnet alloy represented by 100-XYZ B Y M Z
R is at least one or more of the rare earth elements containing Nd, M is at least one or more of the elements of Al, Co, Ga, Nb and Zr, and the composition ratio is X in atomic percentage. = 10 to 25%, Y = 1 to 20%, and Z = 0 to 20%.
これら永久磁石の従来の湿式法による潤滑剤の被覆工
程を含む製造は次の工程で行なわれる。The production of these permanent magnets including the step of coating a lubricant by a conventional wet method is performed in the following steps.
上記合金組成を高周波炉、アーク炉等で真空または不
活性雰囲気中で溶解し、その後水冷鋳型に鋳造する。
ジョークラッシャー、ブラウンミル、スタンプミルなど
により20〜100μｍ程度まで粗粉砕し、次いで振動ミ
ル、ジェットミル、湿式ボールミル等で２〜10μｍ程度
まで微粉砕する。The above alloy composition is melted in a high-frequency furnace, an arc furnace, or the like in a vacuum or inert atmosphere, and then cast into a water-cooled mold.
The material is roughly pulverized to about 20 to 100 μm using a jaw crusher, a brown mill, a stamp mill, or the like, and then finely pulverized to about 2 to 10 μm using a vibration mill, a jet mill, a wet ball mill, or the like.
この微粉末表面に湿式法により潤滑剤を被覆する。
金型を用いて磁場中で磁場配向及び圧縮成形を行なう。
潤滑剤被覆磁石合金粉末の配向、成形は、横押しまたは
縦押し成形が好ましい。焼結は1,000〜1,200℃の範囲
内の所定の温度に真空または不活性雰囲気中で30〜120
分間保持する。時効処理は同上雰囲気下で350℃〜焼
結温度の範囲内で30分間〜４時間保持する。この湿式法
による潤滑剤の被覆方法では有機溶剤を使用するため、
爆発または有毒ガスの発生、コスト高等の欠点があり、
その改良が望まれていた。The surface of the fine powder is coated with a lubricant by a wet method.
Magnetic orientation and compression molding are performed in a magnetic field using a mold.
The orientation and molding of the lubricant-coated magnet alloy powder is preferably horizontal or vertical. Sintering is performed at a predetermined temperature within the range of 1,000 to 1,200 ° C in a vacuum or inert atmosphere for 30 to 120
Hold for a minute. The aging treatment is performed at 350 ° C. to the sintering temperature in the same atmosphere for 30 minutes to 4 hours. In this method of coating a lubricant by a wet method, since an organic solvent is used,
There are disadvantages such as explosion or generation of toxic gas, high cost,
The improvement was desired.
本発明はこれらの問題点を解決した乾式法を開発した
もので、前述の工程中磁石合金インゴットを粗粉砕後、
粗粉に潤滑剤をＶミキサーにて混合し、この混合粉末を
ジェットミル、振動ミル、乾式ボールミル等の微粉砕機
により２〜10μｍ程度の微粉に粉砕すれば良い。この工
程で潤滑剤は粉砕時に発生する熱で溶融し磁石合金粉末
表面に均一に被覆される。The present invention has developed a dry method that solves these problems, and after coarsely pulverizing the magnet alloy ingot during the above-described process,
The coarse powder may be mixed with a lubricant by a V mixer, and the mixed powder may be pulverized to a fine powder of about 2 to 10 μm by a fine pulverizer such as a jet mill, a vibration mill, and a dry ball mill. In this step, the lubricant is melted by the heat generated during the pulverization and is uniformly coated on the surface of the magnet alloy powder.
この潤滑剤は、高級脂肪酸、高級アルコール、ポリエ
チレングリコール等から選択される１種または２種以上
からなる。固体状粉末で融点が50〜100℃の範囲のもの
が良いが、液体状のものであってもよい。具体的にはス
テアリン酸、アラキジン酸、ベヘニン酸、ステアリルア
ルコール、セチルアルコール、分子量200〜20,000のポ
リエチレングリコール等が例示され、その添加量は磁石
合金粗粉に対して0.005〜1.0重量％が好ましく、0.005
重量％未満では添加効果がなく、1.0重量％を越えると
磁気特性を劣化させるようになる。This lubricant is composed of one or more selected from higher fatty acids, higher alcohols, polyethylene glycol and the like. A solid powder having a melting point in the range of 50 to 100 ° C. is preferable, but a liquid powder may be used. Specific examples include stearic acid, arachidic acid, behenic acid, stearyl alcohol, cetyl alcohol, polyethylene glycol having a molecular weight of 200 to 20,000, and the amount of addition is preferably 0.005 to 1.0% by weight based on the magnet alloy coarse powder. 0.005
If it is less than 1.0% by weight, there is no effect, and if it exceeds 1.0% by weight, the magnetic properties deteriorate.
以上述べたように乾式法により磁石合金微粉末表面へ
潤滑剤を被覆した結果、これを原料として磁場中圧縮成
形し、焼結して保磁力低下の殆ど無い磁気特性に優れた
希土類永久磁石が得られ、さらに本願発明は、湿式法の
ように複雑な工程を必要とせず、安全性も極めて高く、
コストダウンにつながる製造方法である。As described above, as a result of coating the lubricant on the surface of the magnet alloy fine powder by the dry method, a rare earth permanent magnet excellent in magnetic properties with almost no reduction in coercive force is obtained by compression molding in a magnetic field using this as a raw material and sintering. Obtained, furthermore, the present invention does not require a complicated process like a wet method, and has extremely high safety,
This is a manufacturing method that leads to cost reduction.
以下、本発明の実施態様を実施例を挙げて説明する
が、本発明はこれら実施例によって限定されるものでは
ない。Hereinafter, embodiments of the present invention will be described with reference to examples, but the present invention is not limited to these examples.
（実施例１） 出発原料として純度99.7重量％以上のNd、純度99.9重
量％以上の電解鉄およびB 19.4重量％を含有し残部はFe
80.0重量％及びAl,Si,C等の不純物からなるフェロボロ
ン合金を使用し、これらを高周波溶解した後銅鋳型に鋳
造し、Nd15.06Dy0.34Fe71.96Co3.84B7Al1Nb0.4なる組成
のインゴットを得た。このインゴットをジョークラッシ
ャー、ブラウンミルにより32メッシュ以下に粗粉砕し
た。次にこの粗粉100重量部と潤滑剤としてステアリン
酸0.10重量部をＶミキサーにて混合して混合粗粒とし、
これをジェットミルにより窒素気流中で微粉砕し、平均
粒径３μｍの潤滑剤が被覆された原料磁石粉末を得た。
次いでこのようにして得られた磁石合金微粉末を用いて
10KOeの磁場中で配向し、1.0T/cm2にて加圧成形し、幅3
cm×長さ5cm×高さ2cmの成形体を100個連続成形した。
この成形性の評価として成形体に傷、欠け等の欠陥のな
い場合を○、ある場合を×として表１に示した。さらに
これらの成形体をアルゴン中1,080℃、１時間の条件で
焼結し、600℃、２時間の時効処理を施して永久磁石を
作製した。これらの永久磁石の磁気特性を表１に併記し
た。(Example 1) As starting materials, Nd having a purity of 99.7 wt% or more, electrolytic iron having a purity of 99.9 wt% or more, and 19.4 wt% of B were contained, and the balance was Fe.
Using ferroboron alloy consisting of 80.0% by weight and impurities such as Al, Si, C, etc., these are melted by high frequency and cast into a copper mold, and ingot of composition Nd 15.06 Dy 0.34 Fe 71.96 Co 3.84 B 7 Al 1 Nb 0.4 I got This ingot was coarsely ground to 32 mesh or less by a jaw crusher and a brown mill. Next, 100 parts by weight of the coarse powder and 0.10 parts by weight of stearic acid as a lubricant were mixed with a V mixer to obtain mixed coarse particles.
This was finely pulverized in a nitrogen stream by a jet mill to obtain a raw material magnetic powder coated with a lubricant having an average particle diameter of 3 μm.
Then, using the magnetic alloy fine powder thus obtained,
Oriented in a magnetic field of 10 KOe, and pressure molded at 1.0 T / cm 2, width 3
100 molded articles of cm × length 5 cm × height 2 cm were continuously molded.
The evaluation of the moldability is shown in Table 1 as ○ when there is no defect such as a crack or chip in the molded body, and as X when there is a defect. Further, these compacts were sintered in argon at 1,080 ° C. for 1 hour, and subjected to an aging treatment at 600 ° C. for 2 hours to produce permanent magnets. Table 1 also shows the magnetic properties of these permanent magnets.
（比較例１） 潤滑剤の被覆を湿式で実施した以外は、実施例１と同
一条件で磁石合金微粉末、成形体、永久磁石を作製し、
成形性、磁気特性を評価し、表１に併記した。湿式法は
磁石合金微粉末100重量部に対し、ステアリン酸0.1重量
部をトルエンを溶媒として混合した後、乾燥して潤滑剤
被覆磁石合金粉末とした。(Comparative Example 1) A magnet alloy fine powder, a compact, and a permanent magnet were produced under the same conditions as in Example 1 except that the coating of the lubricant was performed by a wet method.
The moldability and magnetic properties were evaluated and are shown in Table 1. In the wet method, 0.1 part by weight of stearic acid was mixed with 100 parts by weight of magnetic alloy powder using toluene as a solvent, and then dried to obtain a lubricant-coated magnetic alloy powder.
（比較例２） 潤滑剤を被覆しない以外は、実施例１と同一条件で磁
石合金微粉末、成形体、永久磁石を作製し、性能を評価
した。(Comparative Example 2) Fine powder of a magnetic alloy, a molded body, and a permanent magnet were produced under the same conditions as in Example 1 except that the lubricant was not coated, and the performance was evaluated.
（発明の効果） 本発明によれば、Nd−Fe−Ｂ系希土類永久磁石合金粉
末に潤滑剤を複雑な工程を経ずに、かつ安全性が極めて
高く低コストで被覆することができる。これによれば、
磁場中成形時の配向の乱れを極力抑えることができ、そ
の結果、残留磁束密度は向上し、保磁力低下の殆ど無い
磁気特性に優れた希土類永久磁石が得られ、工業上その
利用価値は極めて高いものである。 (Effects of the Invention) According to the present invention, a lubricant can be coated on a Nd-Fe-B-based rare earth permanent magnet alloy powder with extremely high safety at a low cost without going through a complicated process. According to this,
The disturbance of the orientation during molding in a magnetic field can be suppressed as much as possible, and as a result, a rare-earth permanent magnet with improved residual magnetic flux density and excellent magnetic properties with almost no decrease in coercive force can be obtained. It is expensive.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B22F 1/00 - 3/26 B22C 1/04 - 33/02 B22F 9/04 H01F 1/053 - 1/08 ──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) B22F 1/00-3/26 B22C 1/04-33/02 B22F 9/04 H01F 1/053-1 / 08
Claims (2)
を含む希土類元素のうち、少なくとも１種類もしくは２
種類以上の元素。ＭはAl,Co,Ga,Nb,Zrのうち少なくとも
１種類もしくは２種類以上の元素。原子百分率でＸ＝10
〜25％、Ｙ＝１〜20％、Ｚ＝０〜20％）からなる永久磁
石合金粗粉100重量部に対して、潤滑剤0.05重量部以上
1.0重量部以下を乾式法で添加混合した混合物を微粉砕
し、表面が潤滑剤で被覆された微粉末とした後、磁場中
で配向させながらプレス成形することを特徴とする希土
類鉄系永久磁石の製造方法。1. A composition formula R X Fe 100-XYZ B Y M Z ( where, R represents Nd
At least one or two of the rare earth elements containing
More than one kind of element. M is at least one or more of Al, Co, Ga, Nb, and Zr. X = 10 in atomic percentage
-25%, Y = 1-20%, Z = 0-20%) Permanent magnet alloy coarse powder 100 parts by weight, lubricant 0.05 parts by weight or more
A rare earth iron-based permanent magnet characterized in that a mixture obtained by adding and mixing 1.0 part by weight or less by a dry method is finely pulverized, and then finely powdered whose surface is coated with a lubricant, and then pressed while being oriented in a magnetic field. Manufacturing method.
リエチレングリコールから選択される１種または２種以
上からなる請求項１に記載の希土類鉄系永久磁石の製造
方法。2. The method for producing a rare earth iron-based permanent magnet according to claim 1, wherein the lubricant comprises one or more selected from higher fatty acids, higher alcohols and polyethylene glycol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2323799A JP2915560B2 (en) | 1990-11-27 | 1990-11-27 | Manufacturing method of rare earth iron-based permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2323799A JP2915560B2 (en) | 1990-11-27 | 1990-11-27 | Manufacturing method of rare earth iron-based permanent magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04191302A JPH04191302A (en) | 1992-07-09 |
| JP2915560B2 true JP2915560B2 (en) | 1999-07-05 |
Family
ID=18158744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2323799A Expired - Lifetime JP2915560B2 (en) | 1990-11-27 | 1990-11-27 | Manufacturing method of rare earth iron-based permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2915560B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006001355A1 (en) * | 2004-06-25 | 2006-01-05 | Tdk Corporation | Rare earth sintered magnet, raw material alloy powder for rare earth sintered magnet, and process for producing rare earth sintered magnet |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5486224A (en) * | 1993-12-28 | 1996-01-23 | Sumitomo Metal Industries, Ltd. | Powder mixture for use in compaction to produce rare earth iron sintered permanent magnets |
| CN105206416A (en) * | 2015-10-28 | 2015-12-30 | 廊坊京磁精密材料有限公司 | Orientation press method of neodymium-iron-boron magnet |
| CN110181040B (en) * | 2019-07-16 | 2021-05-28 | 中钢集团南京新材料研究院有限公司 | Lubricant for preparing neodymium-iron-boron magnet through powder metallurgy and using method |
-
1990
- 1990-11-27 JP JP2323799A patent/JP2915560B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006001355A1 (en) * | 2004-06-25 | 2006-01-05 | Tdk Corporation | Rare earth sintered magnet, raw material alloy powder for rare earth sintered magnet, and process for producing rare earth sintered magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04191302A (en) | 1992-07-09 |
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