JPH0713241B2 - Method for producing rare earth magnet alloy powder - Google Patents
Method for producing rare earth magnet alloy powderInfo
- Publication number
- JPH0713241B2 JPH0713241B2 JP2410798A JP41079890A JPH0713241B2 JP H0713241 B2 JPH0713241 B2 JP H0713241B2 JP 2410798 A JP2410798 A JP 2410798A JP 41079890 A JP41079890 A JP 41079890A JP H0713241 B2 JPH0713241 B2 JP H0713241B2
- Authority
- JP
- Japan
- Prior art keywords
- rare earth
- magnet
- alloy powder
- powder
- producing
- 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 - Fee Related
Links
- 239000000843 powder Substances 0.000 title claims description 35
- 239000000956 alloy Substances 0.000 title claims description 19
- 229910045601 alloy Inorganic materials 0.000 title claims description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 229910052761 rare earth metal Inorganic materials 0.000 title claims description 13
- 150000002910 rare earth metals Chemical class 0.000 title claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000012298 atmosphere Substances 0.000 claims description 7
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 6
- 238000010298 pulverizing process Methods 0.000 claims description 5
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052723 transition metal Inorganic materials 0.000 claims description 3
- 150000003624 transition metals Chemical group 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 2
- 239000004033 plastic Substances 0.000 description 11
- 239000011261 inert gas Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229940087654 iron carbonyl Drugs 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000013521 mastic Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003860 storage Methods 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
- H01F1/0572—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 with a protective layer
Description
【０００１】[0001]
【産業上の利用分野】本発明は，Ｒ２Ｔ14Ｂ系磁石合金
に関し，特にそのプラスチック複合磁石や焼結磁石の製
造に用いる磁石合金粉末の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an R 2 T 14 B type magnet alloy, and more particularly to a method for producing a magnet alloy powder used for producing a plastic composite magnet or a sintered magnet thereof.
【０００２】[0002]
【従来の技術】プラスチック磁石は，２０〜数μｍの磁
石合金粉末とプラスチックとを混合して射出成形する
か、粉末成形体にプラスチックを含浸させることによっ
て製造されている。このようなプラスチック磁石は複雑
な形状のものでも高い寸法精度をもって成形できるこ
と，軽量で欠けにくい等の利点があるが，磁石特性が低
いという短所をもっている。一方，Ｒ２Ｔ14Ｂ系磁石は
優れた特性を有するのでプラスチック磁石への適用が期
待されている。2. Description of the Related Art Plastic magnets are manufactured by mixing magnet alloy powder of 20 to several .mu.m and plastic and injection molding or by impregnating a powder compact with plastic. Such plastic magnets have the advantage that they can be molded with high dimensional accuracy even if they have complicated shapes, and they are lightweight and resistant to chipping, but they have the disadvantage of poor magnet characteristics. On the other hand, R 2 T 14 B-based magnets have excellent properties and are expected to be applied to plastic magnets.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、Ｒ２Ｔ
14Ｂ焼結磁石合金を２０〜数μｍに粉砕すると保磁力が
急激に低下し，これに熱処理を施しても回復しない。こ
のためＲ２Ｔ14Ｂ磁石合金を用いて，高性能のプラスチ
ック磁石を得ることはできなかった(Proceeding of Eig
hth International Workshop on Rare-Earth Magnets a
nd Their Application １９８５年，７０５頁 参
照）。もっとも，粒径を１００μｍ以上とすると，一定
の保磁力が得られるが，成形金型の寿命が短くなるなど
の欠点がある。However, R 2 T
When the 14B sintered magnet alloy is pulverized to 20 to several μm, the coercive force is drastically reduced, and even if it is heat-treated, it cannot be recovered. For this reason, it was not possible to obtain a high-performance plastic magnet using the R 2 T 14 B magnet alloy (Proceeding of Eig
hth International Workshop on Rare-Earth Magnets a
nd Their Application, 1985, p. 705). However, if the particle size is 100 μm or more, a certain coercive force can be obtained, but there is a drawback that the life of the molding die is shortened.
【０００４】また，Ｒ２Ｔ14Ｂ系合金薄帯を粉砕した粉
末を用いてプラスチック磁石を製造することも行われて
いるが(IEEE Trans.Mag.Vol.Mag.-２１ １９８５年１
９５８頁），磁石特性は低く，最大磁気エネルギー積で
わずかに９ＭＧＯｅ程度にすぎない。In addition, a plastic magnet is also manufactured by using a powder obtained by crushing an R 2 T 14 B type alloy ribbon (IEEE Trans.Mag.Vol.Mag.-21 1985 1
958), the magnet characteristics are low, and the maximum magnetic energy product is only about 9 MGOe.
【０００５】その上，Ｒ２Ｔ14Ｂ系磁石粉末は，きわめ
て活性で，プラスチック複合磁石の成形後，長時間放置
すると粉末が酸化し，成形帯が崩壊する場合もある。ま
た，Ｒ２Ｔ14Ｂ磁石粉末を成形後焼結して得る焼結型の
磁石は，優れた特性を有するが，Ｒ２Ｔ14Ｂ磁石粉末は
極めて活性であるので，成形焼結前に長時間保存するこ
とが不可能であるという欠点を有する。In addition, the R 2 T 14 B type magnet powder is extremely active, and after molding the plastic composite magnet, if left for a long time, the powder may oxidize and the molding zone may collapse. Further, a sintered magnet obtained by compacting and sintering R 2 T 14 B magnet powder has excellent characteristics, but since R 2 T 14 B magnet powder is extremely active, it should be treated before compaction and sintering. It has a drawback that it cannot be stored for a long time.
【０００６】また，Ｒ２Ｔ14Ｂ磁石粉末を成形後、焼結
して得る焼結型磁石は，優れた特性を有するが，Ｒ２Ｔ
14Ｂ磁石粉末は極めて活性であるので，成形前に長時間
保存することが不可能であるという欠点を有する。 Further, after forming the R 2 T 14 B magnetic powder sintered magnet obtained by sintering, it has excellent characteristics, R 2 T
Since 14 B magnet powder is extremely active, it has the drawback that it cannot be stored for a long time before molding.
【０００７】そこで，本発明の第１の技術的課題は，高
性能のプラスチック複合磁石を提供できるようなＲ２Ｔ
14Ｂ系磁石粉末を提供することにある。Therefore, the first technical problem of the present invention is to provide R 2 T which can provide a high performance plastic composite magnet.
14 It is to provide a B type magnet powder.
【０００８】また，本発明の第２の技術的課題は，耐酸
化性に優れ，長時間の保存でも安定した保磁力を維持で
きるＲ２Ｔ14Ｂ系磁石粉末を提供することにある。A second technical object of the present invention is to provide an R 2 T 14 B based magnet powder which is excellent in oxidation resistance and can maintain a stable coercive force even when stored for a long time.
【０００９】[0009]
【課題を解決するための手段】本発明によれば，Ｒ２Ｔ
14Ｂ（ここでＲはイットリウムを含む希土類元素のうち
少なくとも一種，Ｔは遷移金属，Ｂはホウ素）を主成分
とする溶製合金を粉砕して微粉末を得る微粉砕工程と，
前記微粉末粒子表面を金属カルボニルＭ（ＣＯ）ｘ（こ
こで，ＭはＶ，Ｃｒ，Ｍｏ，Ｗ，Ｍｎ，Ｆｅ，Ｃｏ，Ｎ
ｉの少なくとも一種、ｘはＭの金属元素に応じて定まる
２〜１２までの数値）を分解した金属Ｍで被覆する被覆
工程とを含むことを特徴とする希土類磁石合金粉末の製
造方法が得られる。本発明によれば，前記希土類磁石合
金粉末の製造方法において，前記被覆工程の後、被覆さ
れた微粉末を熱処理する熱処理工程を含むことを特徴と
する希土類磁石合金粉末の製造方法が得られる。本発明
によれば，前記希土類磁石合金粉末の製造方法におい
て，前記熱処理工程は，非酸化性雰囲気中３００〜８０
０℃で１〜３０分行われることを特徴とする希土類磁石
合金粉末の製造方法が得られる。According to the present invention, R 2 T
14 A fine pulverization step of pulverizing a molten alloy containing B (where R is at least one of rare earth elements including yttrium, T is a transition metal, and B is boron) as a main component to obtain fine powder,
Metal carbonyl M (CO) x (where M is V, Cr, Mo, W, Mn, Fe, Co, N) is formed on the surface of the fine powder particles.
At least one kind of i, x is a numerical value from 2 to 12 determined depending on the metal element of M) is coated with a decomposed metal M, and a method for producing a rare earth magnet alloy powder is obtained. . According to the present invention, there is provided a method for producing a rare earth magnet alloy powder, which comprises a heat treatment step of heat treating the coated fine powder after the coating step in the method for producing a rare earth magnet alloy powder. According to the present invention, in the method for producing the rare earth magnet alloy powder, the heat treatment step is performed in a non-oxidizing atmosphere at 300-80.
A method for producing a rare earth magnet alloy powder is obtained which is performed at 0 ° C. for 1 to 30 minutes.
【００１０】（１）Ｒ２Ｔ14Ｂ系磁石粉末を金属カルボ
ニル液体に浸漬後１００〜８００℃還元性または不活性
ガス雰囲気または真空減圧下で１〜６０分熱処理によっ
て厚さ０．１〜５μｍの金属皮膜を有するＲ２Ｔ14Ｂ系
磁石粉末を得ることができる。(1) R 2 T 14 B-based magnet powder is immersed in a metal carbonyl liquid and then heat-treated at 100 to 800 ° C. for 1 to 60 minutes in a reducing or inert gas atmosphere or vacuum reduced pressure to a thickness of 0.1 to 5 μm. It is possible to obtain R 2 T 14 B based magnet powder having the metal coating of
【００１１】（２）１００〜８００℃還元性又は不活性
ガス雰囲気又は真空減圧下に設置したバレルにＲ２Ｔ14
Ｂ系磁石粉末を入れ、金属カルボニルを気体状態で導入
し，分解した金属を磁性粒子表面に沈着させることによ
って，厚さ０．１〜５μｍの金属皮膜を有するＲ２Ｔ14
Ｂ系磁石粉末を得ることができる。(2) R 2 T 14 in a barrel placed under a reducing or inert gas atmosphere or vacuum reduced pressure at 100 to 800 ° C.
R 2 T 14 having a metal coating with a thickness of 0.1 to 5 μm was prepared by adding B-based magnet powder, introducing metal carbonyl in a gaseous state, and depositing decomposed metal on the surface of magnetic particles.
B-based magnet powder can be obtained.
【００１２】（３）上記（１），（２）で得られた粉末
を３００〜８００℃，１〜３０分真空還元性又は不活性
ガス雰囲気で熱処理を施すことにより，金属皮膜と密着
性を増すことができる。なお，金属皮膜には、製造上不
可避の不純物として特に炭素を２〜０．０３ｗｔ％含む
ことができる。(3) By subjecting the powders obtained in (1) and (2) above to heat treatment in a vacuum reducing atmosphere or an inert gas atmosphere at 300 to 800 ° C. for 1 to 30 minutes, the adhesion to the metal film is improved. Can be increased. It should be noted that the metal film may contain carbon in an amount of 2 to 0.03 wt% as an unavoidable impurity in manufacturing.
【００１３】[0013]
【実施例】以下，本発明の実施例について説明する。 （実施例１） 純度９５％のＮｄ，フェロボロン，電解鉄を用い，アル
ゴン雰囲気中で高周波加熱しＦｅ−３４％Ｎｄ−１．１
ｗｔ％Ｂインゴットを得た。このインゴットを粗粉砕し
た後，ボールミルにて平均粒径（気体透過法）約３μｍ
に粉砕した。粉末を乾燥後鉄カルボニルＦｅ（Ｃｏ）５
液に浸漬し，不活性ガス中に２００℃３０分加熱し，カ
ルボニルを分解させた。さらに，不活性ガス中６００℃
２０分熱処理を施した。表面にＦｅ層が形成された粉末
を印加磁界約２０ｋＯｅの下，圧力１トン／ｃｍ２で金
型成形した。成形体を１０８０℃２時間真空焼結後炉冷
した。さらに，５５０℃３０分熱処理した。また，成形
体をＡｒ雰囲気中２０日保管後，上述と同様に焼結，熱
処理を施し，成形体保管の効果を見た。表１は焼結体の
磁気特性を示す。金属被覆により，保存中の特性劣化を
防止することができた。EXAMPLES Examples of the present invention will be described below. (Example 1) Nd, ferroboron, and electrolytic iron having a purity of 95% were used, and high-frequency heating was performed in an argon atmosphere to produce Fe-34% Nd-1.1.
A wt% B ingot was obtained. After roughly crushing this ingot, average particle size (gas permeation method) of about 3 μm with a ball mill
Crushed into After drying the powder, iron carbonyl Fe (Co) 5
It was immersed in the liquid and heated in an inert gas at 200 ° C. for 30 minutes to decompose carbonyl. Furthermore, 600 ℃ in inert gas
Heat treatment was performed for 20 minutes. The powder on the surface of which the Fe layer was formed was molded under an applied magnetic field of about 20 kOe at a pressure of 1 ton / cm 2 . The molded body was vacuum-sintered at 1080 ° C. for 2 hours and then furnace-cooled. Further, it was heat-treated at 550 ° C. for 30 minutes. After the molded body was stored in an Ar atmosphere for 20 days, it was sintered and heat-treated in the same manner as above, and the effect of storing the molded body was examined. Table 1 shows the magnetic properties of the sintered body. With the metal coating, we were able to prevent the deterioration of characteristics during storage.
【００１４】[0014]
【表１】 [Table 1]
【００１５】 （実施例２） 実施例１と同様の方法により，磁石材料を作製するにあ
たり，カルボニル金属皮膜としてＶ，Ｃｒ，Ｍｏ，Ｗ，
Ｍｎ，Ｃｏ，Ｎｉを選び粉砕成形後１日未満および２０
日保存し焼結した磁石の特性を表２に示した。磁石表面
に被覆処理していない従来のものは，経時変化が大き
い。特に，ｌＨｃは４．５％位の減少である。これに対
し，本発明によれば，経時変化は皆無が変化があっても
僅少である。金属皮膜により特性が安定することが分か
る。(Example 2) In producing a magnet material by the same method as in Example 1, V, Cr, Mo, W, and
Select Mn, Co, Ni less than 1 day after crush molding and 20
Table 2 shows the characteristics of the magnets which were stored and sintered for a day. Conventional magnets whose surface is not coated have a large change over time. In particular, lHc is decreased by about 4.5%. On the other hand, according to the present invention, even if there is no change with time, there is little change. It can be seen that the characteristics are stabilized by the metal film.
【００１６】[0016]
【表２】 [Table 2]
【００１７】以上の実施例では，Ｎｄ−Ｆｅ−Ｂ磁石に
ついて述べたが，等質なＲ２Ｔ14Ｂ系磁石についても同
様の効果が得られる。In the above embodiments, the Nd-Fe-B magnet has been described, but the same effect can be obtained with a homogenous R2T14B system magnet.
【００１８】[0018]
【発明の効果】本発明の希土類磁石用合金粉末の製造方
法について，以上詳細に説明したが，Ｒ２Ｔ14Ｂ系磁石
材料原料として溶製合金を微粉砕したＲ２Ｔ14Ｂ系磁石
粉末の粒子表面に金属カルボニルの分解による金属を被
覆することにより，また更に熱処理を加えることにより
高い磁石特性のプラスチック磁石を提供することができ
る耐酸化性の磁石粉末が得られるので，工業上非常に有
益である。The method for producing the alloy powder for rare earth magnets of the present invention has been described in detail above. R 2 T 14 B-based magnet powder obtained by finely pulverizing an ingot alloy as a raw material for R 2 T 14 B-based magnet material By coating the surface of the particles with a metal by decomposition of metal carbonyl, and by further heat treatment, it is possible to obtain an oxidation-resistant magnet powder that can provide a plastic magnet with high magnet characteristics. Be beneficial.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮城県仙台市太白区郡山六丁目７香１号 株式会社トーキン内 (56)参考文献 特開 昭62−213208（ＪＰ，Ａ) 特開 昭59−27505（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, 6-7 Kaori, Koriyama, Taichiro-ku, Sendai-shi, Miyagi Tokin Co., Ltd. (56) References JP 62-213208 (JP, A) JP 59- 27505 (JP, A)
Claims (3)
む希土類元素のうち少なくとも一種，Ｔは遷移金属，Ｂ
はホウ素）を主成分とする溶製合金を粉砕して微粉末を
得る微粉砕工程と，前期微粉末粒子表面を金属カルボニ
ルＭ（ＣＯ）ｘ（ここで，ＭはＶ，Ｃｒ，Ｍｏ，Ｗ，Ｍ
ｎ，Ｆｅ，Ｃｏ，Ｎｉの少なくとも一種、ｘはＭの金属
元素に応じて定まる２〜１２までの数値）を分解した金
属Ｍで被覆する被覆工程とを含むことを特徴とする希土
類磁石合金粉末の製造方法。1. R 2 T 14 B (wherein R is at least one rare earth element including yttrium, T is a transition metal, and B is a transition metal).
Is a pulverization step for pulverizing a molten alloy containing boron as a main component to obtain fine powder, and the metal carbonyl M (CO) x (where M is V, Cr, Mo, W , M
at least one of n, Fe, Co and Ni, x is a numerical value of 2 to 12 determined depending on the metal element of M), and a coating step of coating with decomposed metal M. Manufacturing method.
において，前記被覆工程の後、被覆された微粉末を熱処
理する熱処理工程を含むことを特徴とする希土類磁石合
金粉末の製造方法。2. The method for producing a rare earth magnet alloy powder according to claim 1, further comprising a heat treatment step of heat treating the coated fine powder after the coating step.
において，前記熱処理工程は，非酸化性雰囲気中３００
〜８００℃で１〜３０分行われることを特徴とする希土
類磁石合金粉末の製造方法。3. The method for producing a rare earth magnet alloy powder according to claim 2, wherein the heat treatment step is performed in a non-oxidizing atmosphere at 300
A method for producing a rare earth magnet alloy powder, which is performed at ˜800 ° C. for 1 to 30 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2410798A JPH0713241B2 (en) | 1990-12-15 | 1990-12-15 | Method for producing rare earth magnet alloy powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2410798A JPH0713241B2 (en) | 1990-12-15 | 1990-12-15 | Method for producing rare earth magnet alloy powder |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61100882A Division JPS62284002A (en) | 1986-05-02 | 1986-05-02 | Magnetic alloy powder consisting of rare earth element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04136103A JPH04136103A (en) | 1992-05-11 |
| JPH0713241B2 true JPH0713241B2 (en) | 1995-02-15 |
Family
ID=18519903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2410798A Expired - Fee Related JPH0713241B2 (en) | 1990-12-15 | 1990-12-15 | Method for producing rare earth magnet alloy powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0713241B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903826A (en) * | 2014-04-04 | 2014-07-02 | 北京工业大学 | Corrosion-resistant neodymium, iron and boron permanent magnet |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6519419B2 (en) * | 2015-09-10 | 2019-05-29 | Tdk株式会社 | Iron nitride based magnetic powder and bonded magnet using the same |
-
1990
- 1990-12-15 JP JP2410798A patent/JPH0713241B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903826A (en) * | 2014-04-04 | 2014-07-02 | 北京工业大学 | Corrosion-resistant neodymium, iron and boron permanent magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04136103A (en) | 1992-05-11 |
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