JPH0497505A - Neodymium-iron-boron plastic magnet - Google Patents
Neodymium-iron-boron plastic magnetInfo
- Publication number
- JPH0497505A JPH0497505A JP2215366A JP21536690A JPH0497505A JP H0497505 A JPH0497505 A JP H0497505A JP 2215366 A JP2215366 A JP 2215366A JP 21536690 A JP21536690 A JP 21536690A JP H0497505 A JPH0497505 A JP H0497505A
- Authority
- JP
- Japan
- Prior art keywords
- compound
- epoxy resin
- pot life
- 10min
- weight percent
- 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
- 239000004033 plastic Substances 0.000 title claims abstract description 17
- 229910001172 neodymium magnet Inorganic materials 0.000 title claims description 10
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 title claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000003822 epoxy resin Substances 0.000 claims abstract description 12
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims description 14
- 239000011230 binding agent Substances 0.000 claims description 11
- 150000001412 amines Chemical class 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 5
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 abstract description 4
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 abstract description 4
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 abstract description 4
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000005642 Oleic acid Substances 0.000 abstract description 4
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 abstract description 4
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 abstract description 4
- 239000004593 Epoxy Substances 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 239000004849 latent hardener Substances 0.000 abstract description 2
- 239000006247 magnetic powder Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000012299 nitrogen atmosphere Substances 0.000 abstract description 2
- KUBDPQJOLOUJRM-UHFFFAOYSA-N 2-(chloromethyl)oxirane;4-[2-(4-hydroxyphenyl)propan-2-yl]phenol Chemical compound ClCC1CO1.C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 KUBDPQJOLOUJRM-UHFFFAOYSA-N 0.000 abstract 1
- 238000000748 compression moulding Methods 0.000 abstract 1
- LPUQAYUQRXPFSQ-DFWYDOINSA-M monosodium L-glutamate Chemical compound [Na+].[O-]C(=O)[C@@H](N)CCC(O)=O LPUQAYUQRXPFSQ-DFWYDOINSA-M 0.000 abstract 1
- 238000004781 supercooling Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 239000006087 Silane Coupling Agent Substances 0.000 description 2
- 150000004982 aromatic amines Chemical class 0.000 description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium 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
- H01F1/047—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
- H01F1/0578—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 bonded together
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Hard Magnetic Materials (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はステッピングモータ、スピンドルモータ、トル
クモータ、自動車用モータ、各種アクチュエータ、スピ
ーカ、磁場発生装置などに用いることができるネオジウ
ム−鉄−ボロン系プラスチック磁石に関するものである
。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a neodymium-iron-boron plastic magnet that can be used in stepping motors, spindle motors, torque motors, automobile motors, various actuators, speakers, magnetic field generators, etc. It is related to.
従来の技術
近年、樹脂結合型希土類磁石の分野において最大エネル
ギー積（以下（ＢＨ）■ａＸと略す）を向上させるため
の努力がなされている。そのなかでネオジウム−鉄−ボ
ロン系磁石粉に関するバインダの知見は少ない。BACKGROUND OF THE INVENTION In recent years, efforts have been made to improve the maximum energy product (hereinafter abbreviated as (BH)■aX) in the field of resin-bonded rare earth magnets. Among them, there is little knowledge regarding binders related to neodymium-iron-boron magnet powder.
発明が解決しようとする課題
（ＢＨ）ｗａｘを向上させるためには、（１）磁石粉の
磁化量４π■、保磁力ｉＨｃを大きくする、Ｃ２）成形
体の密度を上げる、（３）磁石粉の磁界による配向性の
改善をするなどの対策が考えられる。上記（２）に関し
ては磁石粉の表面処理による分散性向上を目的として、
シランカップリング剤、チタンカップリング剤、脂肪酸
、脂肪酸金属塩などの添加が特開昭６１−１５４１１３
号公報や特開昭６１−２０８８０８号公報に提案されて
いる。Problems to be Solved by the Invention (BH) In order to improve wax, (1) increase the magnetization amount 4π■ and coercive force iHc of the magnet powder, C2) increase the density of the compact, (3) magnet powder Possible countermeasures include improving the orientation using a magnetic field. Regarding (2) above, for the purpose of improving dispersibility by surface treatment of magnet powder,
Addition of silane coupling agent, titanium coupling agent, fatty acid, fatty acid metal salt, etc. is disclosed in JP-A-61-154113.
This method has been proposed in Japanese Patent Application Laid-Open No. 61-208808.
しかし、成形体の密度が上がり、かつポットライフの長
いバインダシステムについての提案は殆どないのが現状
である。However, at present, there are almost no proposals for binder systems that increase the density of molded bodies and have a long pot life.
本発明者らは、バインダシステムを詳細に吟味すること
により本発明に到達したものである。The present inventors arrived at the present invention by examining binder systems in detail.
本発明はポットライフの長いコンパウンドで、かつ（Ｂ
Ｈ）■ａｘの向上したネオジウム−鉄−ボロン系プラス
チック磁石を提供することを目的とするものである。The present invention is a compound with a long pot life and (B
H) ■An object of the present invention is to provide a neodymium-iron-boron plastic magnet with improved ax.
課題を解決するための手段
この課題を解決するために本発明のネオジウム−鉄−ボ
ロン系プラスチック磁石は、少なくとも磁石粉とバイン
ダとしてのエポキシ樹脂とからなり、エポキシ樹脂の硬
化剤として、エポキシ樹脂のアミンアダクト体である潜
在性硬化剤を使用する構成になっている。Means for Solving the Problem In order to solve this problem, the neodymium-iron-boron plastic magnet of the present invention comprises at least magnet powder and an epoxy resin as a binder. The structure uses a latent curing agent that is an amine adduct.
作用
この構成により得られた成形用コンパウンドはポットラ
イフが長（、かつ成形体の密度が向上し、（Ｂ Ｈ）ｗ
ａｘを改善することができる。Effect The molding compound obtained with this configuration has a long pot life (and the density of the molded product is improved, (B H) w
ax can be improved.
実施例
以下、本発明の一実施例のネオジウム−鉄−ボロン系プ
ラスチック磁石について説明する。EXAMPLE A neodymium-iron-boron plastic magnet according to an example of the present invention will be described below.
本実施例に用いられるネオジウム−鉄−ボロン系磁石粉
としては、超急冷薄帯を据込み加工してつくられたネオ
ジウム−鉄−ボロン系磁石粉があげられる。さらに、温
度特性、耐食性、磁気特性を改善するために、ガリウム
、コバルト、プラセオジウム、錫等の種々の元素を添加
、もしくは置換した磁石粉を使用することも可能である
。The neodymium-iron-boron magnet powder used in this example includes neodymium-iron-boron magnet powder produced by upsetting an ultra-quenched ribbon. Furthermore, in order to improve temperature characteristics, corrosion resistance, and magnetic characteristics, it is also possible to use magnet powder to which various elements such as gallium, cobalt, praseodymium, and tin are added or substituted.
分散剤としては、脂肪酸、シランカップリング剤、各種
界面活性剤などが使用される。As the dispersant, fatty acids, silane coupling agents, various surfactants, etc. are used.
樹脂バインダとしては、接着強度の点からエポキシ樹脂
を使用する。樹脂バインダの総量は、磁気特性と成形体
の強度で決定される。磁石粉に対して１．４重量％以下
では成形体が脆（実用にならず、３．０重量％以上では
磁気特性が低下する。As the resin binder, epoxy resin is used from the viewpoint of adhesive strength. The total amount of resin binder is determined by the magnetic properties and the strength of the molded body. If the amount is less than 1.4% by weight based on the magnet powder, the molded product will be brittle (not practical), and if it is more than 3.0% by weight, the magnetic properties will deteriorate.
混線分散については、各種の混線機が使用される。例え
ば、ボールミル、プラネタリ−ミキサ。For crosstalk distribution, various crosstalk machines are used. For example, ball mill, planetary mixer.
アッパーミル、ヘンシェルミキサ、高速ミキサー、マイ
クロミルグラインダーなどが用いられる。Upper mills, Henschel mixers, high-speed mixers, micro mill grinders, etc. are used.
（実施例１）
超急冷法、据込加工を経て作製された異方性Ｎｄ−Ｆｅ
−Ｂ−Ｃｏ磁石粉（平均粒径１ｍ）１００重量部とオレ
イン酸０．９重量部を窒素雰囲気下にて高速ミキサーで
１０分間混練する。さらに、エポキシ樹脂（エピコート
８２８ 油化シェルエポキシ社１１りを１．６重量部添
加後１０分間混合する。次に、潜在性硬化剤（アミキュ
アＰＮ−２３味の素■製）を０．４重量部添加し１０分
間混合し、分散を終える。(Example 1) Anisotropic Nd-Fe produced through ultra-quenching method and upsetting process
-100 parts by weight of -B-Co magnet powder (average particle size 1 m) and 0.9 parts by weight of oleic acid are kneaded for 10 minutes in a high-speed mixer under a nitrogen atmosphere. Furthermore, 1.6 parts by weight of an epoxy resin (Epicoat 828 Yuka Shell Epoxy Co., Ltd. 11) is added and mixed for 10 minutes.Next, 0.4 parts by weight of a latent curing agent (Amicure PN-23 manufactured by Ajinomoto ■) is added. Mix for 10 minutes to complete dispersion.
製造したプラスチック磁石コンパウンドを金型に入れて
、１５ＫＯｅの磁場中で圧縮成形を６ｔｏｎ／−の条件
で行った。１００℃１時間の硬化を行ってプラスチック
磁石を得た。The produced plastic magnet compound was placed in a mold and compression molded in a magnetic field of 15 KOe under conditions of 6 tons/-. A plastic magnet was obtained by curing at 100° C. for 1 hour.
プラスチック磁石コンパウンドのポットライフは次のよ
うにして評価した。得られたフンパウンドを常温に放置
し、１時間毎に成形用として抜き取り、上記成形条件で
プラスチック磁石を作製する。成形体の磁気特性が初期
磁気特性より５％低下するまでの時間をコンパウンドの
ポットライフと定義する。The pot life of the plastic magnet compound was evaluated as follows. The obtained dung powder is left at room temperature and extracted every hour for molding to produce a plastic magnet under the above molding conditions. The pot life of the compound is defined as the time until the magnetic properties of the compact decrease by 5% from the initial magnetic properties.
（比較例１）
実施例においてバインダシステムを以下の通りに変更す
る以外は、同様にしてプラスチック磁石を得た。(Comparative Example 1) A plastic magnet was obtained in the same manner as in Example except that the binder system was changed as follows.
異方性Ｎｄ−Ｆｅ−Ｂ−Ｃｏ磁石粉・・・・・・ １
００重量部オレイン酸・・・・・・ ０．９重量部エ
ポキシ樹脂（エピコート８２８）・・・・・・１，５重
量部脂肪族アミン（ＬＸ−ＩＮ油化シェルエポキシ社製
）・・・・・・Ｏ４，５重量部
（比較例２）
実施例においてバインダシステムを以下の通りに変更す
る以外は、同様にしてプラスチック磁石を得た。Anisotropic Nd-Fe-B-Co magnet powder...1
00 parts by weight Oleic acid...0.9 parts by weight Epoxy resin (Epicote 828)...1.5 parts by weight Aliphatic amine (manufactured by LX-IN Yuka Shell Epoxy Co., Ltd.)... ...04.5 parts by weight (Comparative Example 2) A plastic magnet was obtained in the same manner as in the example except that the binder system was changed as follows.
異方性Ｎｄ−Ｆｅ−Ｂ−Ｃｏ磁石粉・・・・・・ １
００重量部オレイン酸・・・・・・ ０．９ 重量・
部エポキシ樹脂（エピコート８２８）・・・・・・１．
２５重量部芳香族アミン（アクメックスＨ−９０日本合
成化工社製） ・・・・・・０．７５重量部以上
で得られたプラスチック磁石成形体の初期磁気特性とプ
ラスチック磁石コンパウンドのポットライフを第１表に
示す。Anisotropic Nd-Fe-B-Co magnet powder...1
00 parts by weight Oleic acid 0.9 parts by weight
Part Epoxy resin (Epicote 828)...1.
25 parts by weight of aromatic amine (Akmex H-90 manufactured by Nippon Gosei Kako Co., Ltd.) ...... Initial magnetic properties of plastic magnet moldings obtained with 0.75 parts by weight or more and pot life of plastic magnet compounds Shown in Table 1.
（以 下 余 白）
第１表
潜在性硬化剤を使用した実施例は、プラスチック磁石コ
ンパウンドのポットライフが２０ｈであり、（Ｂ Ｈ）
ｉａｘ ＝ １５ＭＧＯｅと実用レベルに達していると
いえる。(Blank below) In the example using the latent hardener in Table 1, the pot life of the plastic magnet compound was 20 hours, and (BH)
iax = 15 MGOe, which can be said to have reached a practical level.
一方、比較例１の脂肪族アミン硬化剤では、（ＢＨ）ｍ
ａｘ＝１２ＭＧＯｅ、ポットライフが３ｈＬかなく、実
用レベルには程遠いといえる。On the other hand, in the aliphatic amine curing agent of Comparative Example 1, (BH)m
ax=12MGOe, the pot life is only 3hL, and it can be said that it is far from a practical level.
さらに、比較例２の芳香族アミン硬化剤では（Ｂ Ｈ）
ｍａｘ＝ １５ＭＧＯｅで実用レベルであるが、ポット
ライフが６ｈと短く生産上の問題が大きい。Furthermore, in the aromatic amine curing agent of Comparative Example 2 (B H)
The max = 15 MGOe is at a practical level, but the pot life is short at 6 hours, which poses a major problem in production.
このように、硬化剤の種類により成形体の磁気特性、コ
ンパウンドのポットライフに大きな差異が見られる。成
形体の磁気特性の差は、バインダシステムの磁石粉に対
する吸着力の差、その結果としての分散性の差に基づく
と考えられる。As described above, there are large differences in the magnetic properties of the molded body and the pot life of the compound depending on the type of curing agent. The difference in the magnetic properties of the molded bodies is considered to be based on the difference in the adsorption force of the binder system to the magnetic powder and the resulting difference in dispersibility.
コンパウンドのポットライフの差は、混線時の局部的な
発熱に対するバインダシステムの保存安定性の差による
ものであると考えられる。The difference in the pot life of the compounds is thought to be due to the difference in storage stability of the binder system against local heat generation during crosstalk.
本発明の潜在性硬化剤とは、エポキシ主剤と混合後一定
温度以上になるまで硬化反応を開始しない硬化剤を意味
し、熱安定性が良好であるためポットライフ延長効果を
有していると考えられる。The latent curing agent of the present invention refers to a curing agent that does not initiate a curing reaction until the temperature reaches a certain temperature or higher after mixing with the epoxy base agent, and is said to have a pot life extension effect due to its good thermal stability. Conceivable.
発明の効果
以上述べたように、本発明によれば、エポキシ樹脂の硬
化剤として潜在性硬化剤を採用することにより、成形体
の磁気特性の向上及びコンパウンドのポットライフの延
長が初めて共に可能となった優れたネオジウム−鉄−ボ
ロン系プラスチック磁石を提供するものである。Effects of the Invention As described above, according to the present invention, by employing a latent curing agent as a curing agent for an epoxy resin, it is possible for the first time to both improve the magnetic properties of a molded product and extend the pot life of the compound. The present invention provides an excellent neodymium-iron-boron plastic magnet.
Claims (1)
からなり、エポキシ樹脂の硬化剤として、エポキシ樹脂
のアミンアダクト体である潜在性硬化剤を使用したこと
を特徴とするネオジウム−鉄−ボロン系プラスチック磁
石。1. A neodymium-iron-boron plastic magnet comprising at least magnet powder and an epoxy resin as a binder, and characterized in that a latent hardening agent which is an amine adduct of the epoxy resin is used as a hardening agent for the epoxy resin.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2215366A JP2990759B2 (en) | 1990-08-14 | 1990-08-14 | Method for producing neodymium-iron-boron plastic magnet |
| DE1991604858 DE69104858T2 (en) | 1990-02-09 | 1991-02-06 | Anisotropic bonded magnet based on Nd-Fe-B and manufacturing process. |
| EP19910300981 EP0441616B1 (en) | 1990-02-09 | 1991-02-06 | Anisotropic plastic bonded magnet of the Nd-Fe-B-type and method for making same |
| US07/890,294 US5213703A (en) | 1990-02-09 | 1992-05-27 | Anisotropic neodymium-iron-boron system plastic bonded magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2215366A JP2990759B2 (en) | 1990-08-14 | 1990-08-14 | Method for producing neodymium-iron-boron plastic magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0497505A true JPH0497505A (en) | 1992-03-30 |
| JP2990759B2 JP2990759B2 (en) | 1999-12-13 |
Family
ID=16671105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2215366A Expired - Fee Related JP2990759B2 (en) | 1990-02-09 | 1990-08-14 | Method for producing neodymium-iron-boron plastic magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2990759B2 (en) |
-
1990
- 1990-08-14 JP JP2215366A patent/JP2990759B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2990759B2 (en) | 1999-12-13 |
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