JPH0426104A - Rare earth magnet and manufacture thereof - Google Patents
Rare earth magnet and manufacture thereofInfo
- Publication number
- JPH0426104A JPH0426104A JP2130714A JP13071490A JPH0426104A JP H0426104 A JPH0426104 A JP H0426104A JP 2130714 A JP2130714 A JP 2130714A JP 13071490 A JP13071490 A JP 13071490A JP H0426104 A JPH0426104 A JP H0426104A
- Authority
- JP
- Japan
- Prior art keywords
- rare earth
- earth magnet
- cobalt
- alloy powder
- nitrate
- 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.)
- Pending
Links
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 49
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000000843 powder Substances 0.000 claims abstract description 27
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 12
- 239000000956 alloy Substances 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 12
- 239000007769 metal material Substances 0.000 claims abstract description 9
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims abstract description 7
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 6
- 239000010941 cobalt Substances 0.000 claims abstract description 6
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 6
- PDKHNCYLMVRIFV-UHFFFAOYSA-H molybdenum;hexachloride Chemical compound [Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Mo] PDKHNCYLMVRIFV-UHFFFAOYSA-H 0.000 claims abstract description 4
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000005245 sintering Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract 2
- 238000000576 coating method Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 150000003839 salts Chemical class 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- -1 samarium-cobalt rare earth Chemical class 0.000 claims description 5
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 claims description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- CFYGEIAZMVFFDE-UHFFFAOYSA-N neodymium(3+);trinitrate Chemical compound [Nd+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O CFYGEIAZMVFFDE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052779 Neodymium Inorganic materials 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 2
- 150000002823 nitrates Chemical class 0.000 claims 2
- MOOAHMCRPCTRLV-UHFFFAOYSA-N boron sodium Chemical group [B].[Na] MOOAHMCRPCTRLV-UHFFFAOYSA-N 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 150000001805 chlorine compounds Chemical class 0.000 claims 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical group [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 238000003756 stirring Methods 0.000 claims 1
- 238000005406 washing Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052772 Samarium Inorganic materials 0.000 abstract description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 239000010949 copper Substances 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 abstract description 3
- 239000012279 sodium borohydride Substances 0.000 abstract description 3
- 229910000033 sodium borohydride Inorganic materials 0.000 abstract description 3
- 229910052725 zinc Inorganic materials 0.000 abstract description 3
- 239000011701 zinc Substances 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 229910002651 NO3 Inorganic materials 0.000 abstract 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract 1
- 239000000463 material Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052777 Praseodymium Inorganic materials 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 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
- H01F1/0551—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0552—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 in the form of particles, e.g. rapid quenched powders or ribbon flakes with a protective layer
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Powder Metallurgy (AREA)
- Hard 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、通常の希土類磁石より機械的強度に優れた希
土類磁石とその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rare earth magnet that has better mechanical strength than ordinary rare earth magnets, and a method for manufacturing the same.
（従来の技術）
従来の希土類磁石、例えばサマリウム−コバルト系希土
類磁石の場合には、原料であるサマリウム及びコバルト
に、その他必要に応じてプラセオジム、鉄、銅、亜鉛等
を添加し溶解してインゴットを作成する。そして、該イ
ンゴットを粉砕し数μの粒径の粉末にする。該粉末を磁
界内にて成形し、アルゴン等の不活性気体雰囲気中にて
加熱焼結する。最後に、該焼結体を同じく不活性気体雰
囲気中にて数百度に加熱する熱処理を施し、保磁力を増
加させて希土類磁石が製造される。(Prior art) In the case of conventional rare earth magnets, such as samarium-cobalt rare earth magnets, raw materials such as samarium and cobalt are added with praseodymium, iron, copper, zinc, etc. as necessary, and then melted and made into an ingot. Create. Then, the ingot is crushed into powder with a particle size of several microns. The powder is shaped in a magnetic field and heated and sintered in an inert gas atmosphere such as argon. Finally, the sintered body is heat-treated to several hundred degrees in an inert gas atmosphere to increase the coercive force, thereby producing a rare earth magnet.
上記工程にて製造される希土類磁石は最大エネルギー積
及び保磁力ともに大であるため、小型で高効率な機器の
設計が可能となり、各分野に近年法（使用されつつある
。Rare earth magnets manufactured by the above process have a large maximum energy product and a large coercive force, so it is possible to design small and highly efficient equipment, and this method has been used in various fields in recent years.
（発明が解決しようとする課題）
このような従来の希土類磁石は上記のごとく最大エネル
ギー積及び保磁力ともに大ではあるが、機械的強度に劣
り、例えば引張り強度は５ Ｋｇ／ｍｍ”程度しかない
。(Problems to be Solved by the Invention) Although such conventional rare earth magnets have large maximum energy product and coercive force as described above, they are inferior in mechanical strength, for example, the tensile strength is only about 5 Kg/mm". .
よって、電動機や発電機の回転子のように、高速度にて
回転するものには、遠心力にて破壊するおそれがあるた
め適用できないという問題がある。Therefore, there is a problem in that it cannot be applied to items that rotate at high speeds, such as rotors of electric motors and generators, because they may be destroyed by centrifugal force.
尚、希土類磁石にて回転子を形成し、該回転子の外周面
を高張力材料からなるスリーブにて被覆し、回転子が遠
心力により破壊されることを防止するものが、特開昭６
０−１９７１４４号公報に記載されているが、スリーブ
の厚み分だけ固定子と回転子との間隔が拡張されるので
、希土類磁石の性能を十分に発揮させることができない
。In addition, a rotor is formed from rare earth magnets, and the outer circumferential surface of the rotor is covered with a sleeve made of a high-tensile material to prevent the rotor from being destroyed by centrifugal force, as disclosed in Japanese Patent Laid-Open No. 6.
Although it is described in Japanese Patent No. 0-197144, the distance between the stator and rotor is increased by the thickness of the sleeve, so the performance of the rare earth magnet cannot be fully demonstrated.
（課題を解決するための手段）
本発明は、上記の点に迄みてなされたもので、機械的強
度に優れた希土類磁石とその製造方法を提供しようとす
るものである。(Means for Solving the Problems) The present invention has been made in view of the above points, and aims to provide a rare earth magnet with excellent mechanical strength and a method for manufacturing the same.
本発明による希土類磁石の製造方法を、図を用いて説明
する。A method for manufacturing a rare earth magnet according to the present invention will be explained with reference to the drawings.
図は、本発明による希土類磁石の製造方法のステップを
示すフロー図である。The figure is a flow diagram showing the steps of a method for manufacturing a rare earth magnet according to the present invention.
ステップ１にて、例えばサマリウム−コバルト系希土類
磁石の場合には、原料であるサマリウム及びコバルトに
、その他必要に応じてプラセオジム、鉄、銅、亜鉛等を
添加し溶解してインゴットを作成する。In step 1, for example, in the case of a samarium-cobalt rare earth magnet, praseodymium, iron, copper, zinc, etc. are added and melted to raw materials samarium and cobalt as necessary to create an ingot.
次にステップ２にて、該インゴットを粉砕し数μの粒径
の粉末にする。Next, in step 2, the ingot is crushed into powder with a particle size of several microns.
次にステップ３にて、該希土類元素を含む合金粉末を、
硝酸コバルト、硝酸ネオジウム、硝酸ニッケルあるいは
塩化モリブデン等の金属塩の水溶液中に投入する。Next, in step 3, the alloy powder containing the rare earth element is
Pour into an aqueous solution of a metal salt such as cobalt nitrate, neodymium nitrate, nickel nitrate or molybdenum chloride.
次にステップ４にて、該水溶液中に水素化硼素ナトリウ
ム等の還元剤を添加し、上記金属塩を還元して生成され
る金属材料にて、上記粉末粒子表面を被覆する。Next, in step 4, a reducing agent such as sodium borohydride is added to the aqueous solution, and the surfaces of the powder particles are coated with a metal material produced by reducing the metal salt.
次にステップ５にて、該粒子表面が金属にて被覆されて
いる粉末を水洗した後乾燥する。Next, in step 5, the powder whose particle surface is coated with metal is washed with water and then dried.
次にステップ６にて、該乾燥された粉末を磁場中にて成
形する。Next, in step 6, the dried powder is shaped in a magnetic field.
次にステップ７にて、該成形物を不活性雰囲気中にて加
熱し焼結する。Next, in step 7, the molded product is heated and sintered in an inert atmosphere.
次にステップ８にて、同じく不活性雰囲気中にて、焼結
温度より低温度の所定温度まで加熱する熱処理を施し、
保磁力を強化する。Next, in step 8, heat treatment is performed in the same inert atmosphere to a predetermined temperature lower than the sintering temperature.
Strengthen coercive force.
次にステップ９にて、所望の形状に加工し、着ｍする。Next, in step 9, it is processed into a desired shape and worn.
尚、上記各ステップのうち、ステップ】・２・６・７・
８・９は従来の希土類磁石の製造工程と同じものである
。In addition, among the above steps, step】・2・6・7・
8 and 9 are the same as the manufacturing process of conventional rare earth magnets.
上記工程にて製造される希土類磁石は、希土類元素を含
む合金粉末が金属材料からなる粒界相を介して焼結され
た焼結体となる。The rare earth magnet manufactured in the above process becomes a sintered body in which alloy powder containing a rare earth element is sintered through a grain boundary phase made of a metal material.
（作用）
本発明の希土類磁石は、金属材料からなる粒界相を介し
て焼結されているので、強固に焼結され、よって焼結体
としての機械的強度が増強される。(Function) Since the rare earth magnet of the present invention is sintered through the grain boundary phase made of a metal material, it is strongly sintered, thereby increasing the mechanical strength of the sintered body.
また、本発明による希土類磁石の製造方法は、希土類元
素を含む合金粉末粒子表面を金属塩の還元により生成さ
れる金属材料にて被覆するので、均一な被覆層を形成す
ることができ、よって焼結体の強度が安定する。In addition, in the method for manufacturing a rare earth magnet according to the present invention, the surface of alloy powder particles containing rare earth elements is coated with a metal material produced by reduction of metal salts, so a uniform coating layer can be formed, and therefore a uniform coating layer can be formed. The strength of the structure becomes stable.
（実施例） 以下、本発明の実施例を詳細に説明する。(Example) Examples of the present invention will be described in detail below.
実施例１
上記図のステップ２にて生成されたサマリウム−コバル
ト系希土類磁石の原料となる合金粉末を、１０ｗｔ％硝
酸コバルト水溶液中に投入し、撹拌すると共に、水素可
硼素ナトリウムを添加し、粉末粒子表面を金属コバルト
で被覆した。Example 1 The alloy powder, which is the raw material for the samarium-cobalt rare earth magnet produced in step 2 of the above figure, is poured into a 10 wt% cobalt nitrate aqueous solution, stirred, and sodium borohydride is added to form a powder. The particle surface was coated with metallic cobalt.
該被覆後の粉末を水洗乾燥した後、上記ステップ６以後
の工程により、本発明による高強度磁石である資料Ａを
作成した。After the coated powder was washed with water and dried, Material A, which is a high-strength magnet according to the present invention, was produced by the steps after step 6 described above.
実施例２
上記実施例１における硝酸コバルトの代わりに硝酸ネオ
ジウムを用いて、粉末粒子表面を金属ネオジウムにて被
覆した粉末を作成し、該粉末にて希土類磁石である資！
４Ｂを作成した。Example 2 Using neodymium nitrate instead of cobalt nitrate in Example 1 above, a powder was prepared in which the powder particle surface was coated with neodymium metal.
4B was created.
実施例３
上記実施例１における硝酸コバルトの代わりに、希土類
元素を含む合金粉末に対して、ｗｔ％でニッケル２％、
モリブデン１％となるように、硝酸ニッケル及び塩化モ
リブデンを用いて、粉末粒子表面を金属ニッケル及び金
属モリブデンの混合物にて被覆した粉末を作成し、該粉
末にて希土類磁石である資料Ｃを作成した。Example 3 Instead of cobalt nitrate in Example 1, 2% nickel (wt%),
A powder was prepared using nickel nitrate and molybdenum chloride so that the molybdenum content was 1%, and the surface of the powder particles was coated with a mixture of metal nickel and metal molybdenum, and Material C, which is a rare earth magnet, was created using the powder. .
上記各資料と比較するため、従来の製造方法にて希土類
磁石を作成した。In order to compare with the above materials, rare earth magnets were created using conventional manufacturing methods.
上記各資料と従来の希土類磁石との比較結果を次の表に
示す。The following table shows the comparison results between each of the above materials and conventional rare earth magnets.
上記表より明らかなごとく、本発明による希土類磁石は
従来の希土類磁石と同等の最大エネルギー積を有してい
ると共に、機械的強度が大幅に増強されている。As is clear from the above table, the rare earth magnet according to the present invention has the same maximum energy product as the conventional rare earth magnet, and has significantly increased mechanical strength.
上記において、本発明の実施例について詳細に説明した
が、本発明の精神から逸れないかぎりで、種々の異なる
実施例は容易に構成できるから、本発明は上記特許請求
の範囲において記載した限定以外、特定の実施例に制約
されるのものではない。Although the embodiments of the present invention have been described in detail above, various different embodiments can be easily constructed without departing from the spirit of the invention, and therefore, the present invention is not limited to any limitations other than those set forth in the claims. , and is not limited to any particular implementation.
（発明の効果）
以上説明したように、本発明によれば、従来の希土類磁
石と同等の最大エネルギー積を有していると共に、機械
的強度が大幅に増強されている希土類磁石が提供される
ので、電動機や発電機の回転子のように、高速度にて回
転するものにも、強化スリーブを用いることなく適用す
ることができ、小型で高性能の機器の製造を可能にする
ことができる。(Effects of the Invention) As explained above, according to the present invention, a rare earth magnet is provided which has a maximum energy product equivalent to that of conventional rare earth magnets and has significantly increased mechanical strength. Therefore, it can be applied to items that rotate at high speeds, such as the rotor of electric motors and generators, without using a reinforcing sleeve, making it possible to manufacture small, high-performance equipment. .
図は、本発明による希土類磁石の製造方法のステップを
示すフロー図である。The figure is a flow diagram showing the steps of a method for manufacturing a rare earth magnet according to the present invention.
Claims (8)
磁石において、上記合金粉末粒子の相互間に金属材料か
らなる粒界相を介在せしめたことを特徴とする希土類磁
石。(1) A rare earth magnet that is a sintered body of alloy powder containing a rare earth element, characterized in that a grain boundary phase made of a metal material is interposed between the alloy powder particles.
ル及びモリブデンのうちの少なくとも１種類であること
を特徴とする請求項（１）記載の希土類磁石。(2) The rare earth magnet according to claim (1), wherein the metal material is at least one of cobalt, neodymium, nickel, and molybdenum.
磁石であることを特徴とする請求項（１）記載の希土類
磁石。(3) The rare earth magnet according to claim (1), wherein the rare earth magnet is a samarium-cobalt-based rare earth magnet.
を製造する希土類磁石の製造方法において、上記希土類
元素を含む合金粉末を金属塩の水溶液中に投入するステ
ップと、該水溶液中に還元剤を添加撹拌し、上記合金粉
末粒子表面を上記金属塩の還元により生成された金属材
料にて被覆するステップと、該粉末粒子表面が金属材料
にて被覆された合金粉末を水洗乾燥後、磁場中にて成形
し焼結するステップとを有することを特徴とする希土類
磁石の製造方法。(4) A method for producing a rare earth magnet, in which a rare earth magnet is produced by sintering an alloy powder containing a rare earth element, including the step of introducing the alloy powder containing the rare earth element into an aqueous solution of a metal salt, and reducing the aqueous solution into the aqueous solution. A step of adding and stirring an agent and coating the surfaces of the alloy powder particles with a metal material generated by reduction of the metal salt, and washing and drying the alloy powder whose surfaces are coated with the metal material with water, and then applying a magnetic field. 1. A method for producing a rare earth magnet, comprising the steps of forming and sintering the magnet.
磁石であることを特徴とする請求項（４）記載の希土類
磁石の製造方法。(5) The method for manufacturing a rare earth magnet according to claim (4), wherein the rare earth magnet is a samarium-cobalt rare earth magnet.
の少なくとも１種類であることを特徴とする請求項（４
）記載の希土類磁石の製造方法。(6) Claim (4) characterized in that the metal salt is at least one of nitrates, chlorides, and nitrates.
) The method for producing a rare earth magnet described in
酸ニッケル及び塩化モリブデンのうちの少なくとも１種
類であることを特徴とする請求項（４）記載の希土類磁
石の製造方法。(7) The method for manufacturing a rare earth magnet according to claim (4), wherein the metal salt is at least one of cobalt nitrate, neodymium nitrate, nickel nitrate, and molybdenum chloride.
を特徴とする請求項（４）記載の希土類磁石の製造方法
。(8) The method for manufacturing a rare earth magnet according to claim (4), wherein the reducing agent is sodium boron hydride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2130714A JPH0426104A (en) | 1990-05-21 | 1990-05-21 | Rare earth magnet and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2130714A JPH0426104A (en) | 1990-05-21 | 1990-05-21 | Rare earth magnet and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0426104A true JPH0426104A (en) | 1992-01-29 |
Family
ID=15040870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2130714A Pending JPH0426104A (en) | 1990-05-21 | 1990-05-21 | Rare earth magnet and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0426104A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009128458A1 (en) * | 2008-04-15 | 2009-10-22 | 日東電工株式会社 | Permanent magnet and process for producing permanent magnet |
| WO2009128459A1 (en) * | 2008-04-15 | 2009-10-22 | 日東電工株式会社 | Permanent magnet and process for producing permanent magnet |
-
1990
- 1990-05-21 JP JP2130714A patent/JPH0426104A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009128458A1 (en) * | 2008-04-15 | 2009-10-22 | 日東電工株式会社 | Permanent magnet and process for producing permanent magnet |
| WO2009128459A1 (en) * | 2008-04-15 | 2009-10-22 | 日東電工株式会社 | Permanent magnet and process for producing permanent magnet |
| US8333848B2 (en) | 2008-04-15 | 2012-12-18 | Nitto Denko Corporation | Permanent magnet and process for producing permanent magnet |
| US8500922B2 (en) | 2008-04-15 | 2013-08-06 | Nitto Denko Corporation | Permanent magnet and process for producing permanent magnet |
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