JPH04191302A - Manufacture of rare earth metal-iron based permanent magnet - Google Patents
Manufacture of rare earth metal-iron based permanent magnetInfo
- Publication number
- JPH04191302A JPH04191302A JP2323799A JP32379990A JPH04191302A JP H04191302 A JPH04191302 A JP H04191302A JP 2323799 A JP2323799 A JP 2323799A JP 32379990 A JP32379990 A JP 32379990A JP H04191302 A JPH04191302 A JP H04191302A
- Authority
- JP
- Japan
- Prior art keywords
- rare earth
- permanent magnet
- lubricator
- parts
- lubricant
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 9
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 31
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 4
- 238000010298 pulverizing process Methods 0.000 claims abstract description 4
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 3
- 229930195729 fatty acid Natural products 0.000 claims abstract description 3
- 239000000194 fatty acid Substances 0.000 claims abstract description 3
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 3
- 239000000314 lubricant Substances 0.000 claims description 23
- 238000000576 coating method Methods 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 6
- 229910052779 Neodymium Inorganic materials 0.000 claims description 4
- 150000001298 alcohols Chemical class 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 19
- 230000004907 flux Effects 0.000 abstract description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract 1
- 229910052796 boron Inorganic materials 0.000 abstract 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 235000021355 Stearic acid Nutrition 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 229910001004 magnetic alloy Inorganic materials 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
- 239000002904 solvent Substances 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
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 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
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-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
- 238000003825 pressing 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
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000002253 acid Substances 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
- 238000005056 compaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000002542 deteriorative effect 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
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid 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
- 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
- 229910052710 silicon Inorganic materials 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
- 239000000126 substance Substances 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)
- Hard Magnetic Materials (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Powder Metallurgy (AREA)
Abstract
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 method for manufacturing a metal compound magnet containing Nd and Fe as main components, particularly a Nd-Fe-B rare earth iron 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 magnetic alloy ingot is pulverized into fine powder of several micrometers, then magnetically oriented in a static magnetic field, and press-molded while the magnetic field is applied. In this case, if only the pulverized powder is used, the powder that was oriented in the magnetic field will be disturbed due to friction between the powders during molding and friction between the powder and the mold wall.
The degree of orientation decreases, degrading magnetic properties. In addition, scratches, peeling, cracking, etc. are likely to occur on the mold surface and the molded body surface, which is unfavorable in terms of quality and product yield.As a solution to this problem, the surface of the magnet powder is coated with a lubricant.
（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, coating the magnet surface with this lubricant is generally performed by a wet method. That is, since the lubricant is mainly an organic compound, an inert organic solvent such as n-hexane, toluene, or fluorine-based solvent is used as a solvent. If it reacts with other substances, there is a risk of explosion or generation of toxic gas, which has disadvantages such as deteriorating the working environment and increasing costs.
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。In order to solve these problems, the present invention aims to provide a safe, inexpensive and simple lubricant coating method that replaces the wet method using organic solvents.
（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 this problem, the present inventors researched a dry method as a lubricant coating method, and detailed the conditions such as the lubricant addition process, addition amount, addition method, etc. The present invention was completed after investigation.
本発明の要旨は、
組成式ＲＪｅ＋ｏｏ−ｘ−ｖ−ｚＢ Ｙ Ｍ ｚ （
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、 Ｇｏ、
Ｇａ、 Ｎｄ、 Ｚｒのうち少な（とも１種類もしくは
２種類以上の元素。原子百分率テＸ＝ｌＯ〜２５％、７
２１〜２０％、２＝０〜２０％）からなる永久磁石合金
粗粉をジェットミル、振動ミル等の微粉砕機による微粉
砕時に、潤滑剤を該合金粗粉１００重量部に対して０．
０５重量部以上１．０重量部以下を添加被覆した後、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 as follows: Compositional formula RJe+oo-x-v-zB Y Mz (
However, R is at least one of the rare earth elements including Nd.
type or two or more types of elements, M is Al, Go,
A small amount of Ga, Nd, and Zr (all of them are one or more elements. Atomic percentage teX=lO~25%, 7
21 to 20%, 2 = 0 to 20%) when pulverizing the permanent magnet alloy coarse powder using a pulverizer such as a jet mill or a vibration mill, a lubricant is added to 100 parts by weight of the alloy coarse powder.
0.05 parts by weight or more and 1.0 parts by weight or less is added and coated, and then press-molded while being oriented in a magnetic field.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
先ず、本発明の対象となる磁石組成は、組成式％式％
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Ａ１、 Ｃｏ
、 Ｇａ、 Ｎｄ、 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＝１
０〜２５％、７２１〜２０％、２２０〜２０％からなる
ものとする。First, the magnet composition that is the object of the present invention is a compositional formula % formula % system magnet alloy, where R is at least one or two or more rare earth elements including Nd, and M is A1, Co
, Ga, Nd, and Zr, at least one or two or more elements, the composition ratio of which is X = 1 in atomic percentage
It shall consist of 0-25%, 721-20%, and 220-20%.
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 manufacture of these permanent magnets by a conventional wet method including a lubricant coating step is carried out 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。■
ショークラッシャー、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。(2) The above alloy composition is melted in a vacuum or inert atmosphere in a high frequency furnace, arc furnace, etc., and then cast into a water-cooled mold. ■
Coarsely crushed to about 20-100 μm using a show crusher, brown mill, stamp mill, etc., then 2-10 μm using a vibration mill, jet mill, wet ball mill, etc.
Grind to a fine powder.
■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。■The surface of this fine powder is coated with a lubricant using a wet method. ■
Magnetic field orientation and compression molding are performed in a magnetic field using a mold.
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１，０００〜１，２０
０℃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 lubricant-coated magnet alloy powder is preferably oriented and shaped by horizontal pressing or vertical pressing. ■Sintering is 1,000 to 1,20
The aging treatment is held at a predetermined temperature in the range of 0°C for 30 to 120 minutes in a vacuum or inert atmosphere. (2) Aging treatment is held in the same atmosphere as above at a temperature in the range of 350°C to the sintering temperature for 30 minutes to 4 hours. Since this wet lubricant coating method uses an organic solvent, it has drawbacks such as explosion or generation of toxic gas and high cost, and improvements have been 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. During the above-mentioned process, after coarsely pulverizing the magnetic alloy ingot, a lubricant is mixed with the coarse powder using a V-mixer, and this mixed powder is passed through a jet mill. It may be ground into a fine powder of about 2 to 10 μm using a pulverizer such as a vibration mill or a dry ball mill. In this process, the lubricant is melted by the heat generated during crushing and uniformly coats 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
レンオキサイド等から選択される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、アラキシン酸、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ｏ、 ｏｏｓ〜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 preferably a solid powder with a melting point in the range of 50 to 100°C, consisting of one or more selected from higher fatty acids, higher alcohols, polyethylene oxide, etc., but liquid. Specific examples include stearic acid, araxic acid, behenic acid, stearyl alcohol, cetyl alcohol, molecular weight 200-20,
000 polyethylene glycol etc. is exemplified, and the amount added is o, oos to 1.0 to the magnet alloy coarse powder.
It is preferable that the amount is less than 0.005% by weight, and there is no effect of adding it, and if it exceeds 1.0% by weight, the magnetic properties will 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、焼結した永久磁石はその磁気特性において、湿式法
により製造したものと比較して、何ら遜色のないもので
あり、従って、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 mentioned above, as a result of coating the surface of the magnet alloy fine powder with a lubricant using the dry method, the permanent magnets produced by compression molding and sintering in a magnetic field using this as a raw material are compared in magnetic properties to those manufactured by the wet method. Therefore, it is a manufacturing method that does not require complicated processes like the wet method, has extremely high safety, and 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 explained with reference to examples.
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９
９．９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嗣鋳型に鋳造し、Ｎｄ＋ｓ。６Ｄ
ｙｏ、 ５Ｊｅｙ＋、 ５ｓｃＯｓ、 ＠４ Ｂ ｙＡ
１１Ｎｂｏ４なる組成のインゴットを得た。このインゴ
ットをショークラッシャー、ブラウンミルにより３２メ
ツシユ以下に粗粉砕した。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１ＯＫＯｅの磁場中で配向
し １．ＯＴ／ｃｍ”にて加圧成形し、幅３ｃｍｘ長さ
５ｃｍＸ高さ２ｃ＋ｏ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、欠は等の欠陥の
ない場合をＯｌ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ｉ、ｏｇｏ℃、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) Nd with a purity of 99.7% by weight or more, purity 9 as a starting material
Contains 9.9% by weight or more of electrolytic iron and 19.4% by weight of B, the balance being 80.0% by weight of Fe, Al, Si,
Using a ferroboron alloy consisting of impurities such as C, these were high-frequency melted and then cast into a successor mold to form Nd+s. 6D
yo, 5Jey+, 5scOs, @4 B yA
An ingot having a composition of 11Nbo4 was obtained. This ingot was coarsely crushed to 32 meshes or less using a show crusher and a brown mill. Next, 100 parts by weight of this coarse powder and 0.10 parts by weight of stearic acid as a lubricant were mixed in a V-mixer to obtain mixed coarse particles, which were pulverized in a nitrogen stream using a jet mill to obtain an average particle size of 3 μm. Raw material magnet powder coated with lubricant was obtained. Next, the magnetic alloy fine powder thus obtained was oriented in a magnetic field of 1 OKOe.1. OT/cm", and 100 molded bodies with a width of 3 cm, a length of 5 cm, and a height of 2c+o were continuously molded. As an evaluation of the moldability, cases in which there were no defects such as scratches or chips on the molded bodies were evaluated as "Ol". Some cases are indicated as x in Table 1.Furthermore, these molded bodies were sintered in argon at 1,000°C for 1 hour, and subjected to aging treatment at 600°C for 2 hours to produce permanent magnets. Table 1 shows the magnetic properties of these permanent magnets.
Also listed.
（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) Magnet alloy fine powder, compacts, and permanent magnets were prepared under the same conditions as in Example 1, except that the lubricant coating was carried out in a wet manner, and the moldability and magnetic properties were evaluated. Also listed. In the wet method, 100 parts by weight of magnet alloy powder was mixed with 0.1 part by weight of stearic acid using toluene as a solvent, and then dried to obtain a lubricant-coated magnet alloy powder.
（比較例２）
潤滑剤を被覆しない以外は５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) A magnet alloy fine powder, a molded body, and a permanent magnet were produced under the same conditions as in Example 1 except that they were not coated with a lubricant, and their performance was evaluated.
表１
（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
末に潤滑剤を乾式法により被覆することにより、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。Table 1 (Effects of the Invention) According to the present invention, by coating the Nd-Fe-B rare earth permanent magnet alloy powder with a lubricant using a dry method, it is possible to suppress as much as possible the disturbance of orientation during compaction in a magnetic field. 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 is obtained, and its utility value in industry is extremely high.
Claims (2)
−＿ＺＢ＿ＹＭ＿Ｚ（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，Ｎｄ，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
永久磁石合金粗粉を微粉砕機による微粉砕時に、潤滑剤
を該合金粗粉１００重量部に対して０．０５重量部以上
１．０重量部以下を添加被覆した後、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. Composition formula R_XFe_1_0_0_-_X_-_Y_
-_ZB_YM_Z (However, R is at least one or two or more types of rare earth elements including Nd. M is at least one of Al, Co, Ga, Nd, and Zr.
A type or two or more types of elements. X:10 in atomic percentage
-25%, Y: 1-20%, Z: 0-20%) When pulverizing the permanent magnet alloy coarse powder using a pulverizer, 0.05 parts by weight of lubricant was added to 100 parts by weight of the alloy coarse powder. 1. A method for producing a rare earth iron permanent magnet, which comprises coating the permanent magnet with an additive of 1.0 parts by weight or more and then press-molding the magnet while orienting it in a magnetic field.
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
ることを特徴とする請求項１に記載の希土類鉄系永久磁
石の製造方法。2. 2. The method for producing a rare earth iron 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 true JPH04191302A (en) | 1992-07-09 |
| JP2915560B2 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 (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 |
| CN110181040A (en) * | 2019-07-16 | 2019-08-30 | 中钢集团南京新材料研究院有限公司 | A kind of powder metallurgy prepares the lubricant and application method of neodymium iron boron magnetic body |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1947208B (en) * | 2004-06-25 | 2010-12-08 | Tdk株式会社 | Rare earth sintered magnet, raw material alloy powder for rare earth sintered magnet, and process for producing rare earth sintered magnet |
-
1990
- 1990-11-27 JP JP2323799A patent/JP2915560B2/en not_active Expired - Lifetime
Cited By (4)
| 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 |
| US5527504A (en) * | 1993-12-28 | 1996-06-18 | 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 |
| CN110181040A (en) * | 2019-07-16 | 2019-08-30 | 中钢集团南京新材料研究院有限公司 | A kind of powder metallurgy prepares the lubricant and application method of neodymium iron boron magnetic body |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2915560B2 (en) | 1999-07-05 |
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