JPS63227701A - Production of permanent magnet mode of rare earth metal-containing alloy - Google Patents
Production of permanent magnet mode of rare earth metal-containing alloyInfo
- Publication number
- JPS63227701A JPS63227701A JP6120487A JP6120487A JPS63227701A JP S63227701 A JPS63227701 A JP S63227701A JP 6120487 A JP6120487 A JP 6120487A JP 6120487 A JP6120487 A JP 6120487A JP S63227701 A JPS63227701 A JP S63227701A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- alloy
- rare earth
- magnetic anisotropy
- compacting
- 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
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 23
- 239000000956 alloy Substances 0.000 title claims abstract description 23
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 150000002910 rare earth metals Chemical class 0.000 title abstract 3
- 230000005291 magnetic effect Effects 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 51
- 239000000843 powder Substances 0.000 claims abstract description 44
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 239000013013 elastic material Substances 0.000 claims abstract description 6
- 230000006835 compression Effects 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 15
- 238000009694 cold isostatic pressing Methods 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 230000032683 aging Effects 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 4
- 230000005415 magnetization Effects 0.000 abstract description 3
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 229910000521 B alloy Inorganic materials 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
- 238000005056 compaction Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000462 isostatic pressing Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002907 paramagnetic material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
ＬｉＬユ皿旦±１
本発明は、粉末冶金法による希土類元素含有合金製永久
磁石の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a permanent magnet made of a rare earth element-containing alloy by a powder metallurgy method.
お び の １ ・
磁気異方性の大きな希土類元素含有合金で形成された永
久磁石、特にＮｄ −Ｆｅ −Ｂ系合金で形成された永
久磁石はｎいエネルギー槓を有することが知られている
。この希土類元素含有合金製永久磁石は、第１図に示す
工程で粉末冶金法によって製造される。留意すべきは、
圧粉体に一軸性の磁気異方性を付与づるために磁場中で
合金粉末の圧粉成形を行なっている点である。この磁場
成形の状態を第２図に示している。1. It is known that permanent magnets made of alloys containing rare earth elements with large magnetic anisotropy, especially permanent magnets made of Nd-Fe-B alloys, have low energy levels. This rare earth element-containing alloy permanent magnet is manufactured by powder metallurgy in the steps shown in FIG. It should be noted that
The point is that the alloy powder is compacted in a magnetic field in order to impart uniaxial magnetic anisotropy to the powder compact. The state of this magnetic field shaping is shown in FIG.
図中、０１は常磁性材料で形成された金型を示し、０２
、０３はそれぞれ非磁性材料で形成された上バンヂ、下
パンチを示している。金型０１のキャビｆイ内に装入さ
れた粉体０４は、界磁コイル０６によって形成される！
ｉ磁場中上、■ζパンチ０２．０３により圧縮される。In the figure, 01 indicates a mold made of paramagnetic material, and 02
, 03 indicate an upper bandage and a lower punch, respectively, which are made of non-magnetic material. The powder 04 charged into the cavity f of the mold 01 is formed by the field coil 06!
i Magnetic field middle top, ■ Compressed by ζ punch 02.03.
この間、粉体０４の各粒子０５は磁界目方向に一軸磁気
異方性が誘導される。During this time, uniaxial magnetic anisotropy is induced in each particle 05 of the powder 04 in the direction of the magnetic field.
斯様に、磁界方向に対して１角な方向で粉体０４の圧縮
を行なった場合、各粒子０５の一軸磁気異方性に“ゆら
ぎ”がなく、磁気特性の良好な磁石を得ることができる
。しかしながら、この方法で環状磁石を製造するには、
中心線方向に一軸磁気異方性を誘導できないという欠点
がある。In this way, when the powder 04 is compressed in a direction perpendicular to the direction of the magnetic field, there is no "fluctuation" in the uniaxial magnetic anisotropy of each particle 05, and a magnet with good magnetic properties can be obtained. can. However, to manufacture a ring magnet using this method,
The drawback is that uniaxial magnetic anisotropy cannot be induced in the centerline direction.
この欠点を解消するためには、第３図図示の如く、圧縮
方向と磁界方向とを一致さければ良い。In order to eliminate this drawback, it is sufficient to make the compression direction and the magnetic field direction coincide, as shown in FIG.
ところが、この圧粉成形方法では磁場により各粒子０５
に誘導された一軸磁気異方性が圧縮変形によってゆらぎ
、１６石の磁気特性が儂われる不具合がある。However, in this powder compaction method, each particle 05
There is a problem in that the uniaxial magnetic anisotropy induced in the crystal fluctuates due to compressive deformation, and the magnetic properties of the 16 stones change.
ユＭ盈 °ｌするための−７および
本発明は斯かる技術的前頭の下で創案されたものであり
、その目的とする処は、−軸磁気異方性が所望の４１ｉ
ｆ！方向に付与され、磁気特性の優れた希土類元素含有
合金製永久磁石を得る点にある。-7 and the present invention have been devised under such technical considerations, and the purpose thereof is to obtain the desired 41i-axis magnetic anisotropy.
f! The object of the present invention is to obtain a permanent magnet made of an alloy containing a rare earth element and having excellent magnetic properties.
この目的は、希土類元素を含Ｔｊ する磁気異方性の大
きな合金の粉末を弾性材料製成形容器内に充填し、これ
を磁場中に置いて一軸磁気異方性を付与し、次いで成形
容器ごと該粉末を冷開静水圧プレス法で圧粉成形し、得
られた圧粉体を焼結した後、これに熱処理を施し、さら
に着磁させることによって達成される。The purpose of this is to fill a molded container made of an elastic material with powder of an alloy containing rare earth elements and having a large magnetic anisotropy, place it in a magnetic field to impart uniaxial magnetic anisotropy, and then place the molded container together. This is achieved by compacting the powder using a cold-open isostatic pressing method, sintering the obtained compact, heat-treating it, and further magnetizing it.
粉末の丹粉成形方法としくは、金型とパンチを用いる油
圧プレス、ｍ械ブレスによる方法、ダイスを通じて押出
ず押出し法、遠心力法、［１−ルＦ１延による連続圧搾
法１等方的圧縮力を印加プる冷開静水圧プレス法（ＣＩ
Ｐ法）等が知られている。The powder compaction method includes a hydraulic press using a mold and a punch, a method using an m machine press, an extrusion method without extrusion through a die, a centrifugal force method, and a continuous compression method using 1-ru F1 rolling. Cold-open isostatic pressing method (CI) that applies compressive force
P method) etc. are known.
これ等の圧粉成形方法のうち４、特に冷開静水圧プレス
法が本発明に適する理由は、ゴム、その他の弾性材料（
弾性に富む材料を意味する）で形成された成形容器内（
袋でも良い）内に該粉末を詰め、これを媒体としての流
体で加圧成形する該方法によれば、粉体に対して方向性
のない均雰な几縮力（等方的圧縮力）を印加できるから
である。Among these powder compacting methods, four, especially the cold-open isostatic pressing method, are suitable for the present invention.
Inside a molded container (meaning a highly elastic material)
According to this method of packing the powder into a bag (which may also be a bag) and press-molding it with a fluid as a medium, a homogeneous compression force (isotropic compression force) with no directionality is produced on the powder. This is because it is possible to apply
圧縮力に方向性がなければ、第２図、第３図に示づ圧粉
成形方法におけるが如き問題はなく、製品磁石の着磁方
向と一致する方向の一軸磁気異方性を圧粉成形面の粉末
に付与することが可能である。If the compressive force has no directionality, there will be no problem like the powder compacting method shown in Figures 2 and 3, and the uniaxial magnetic anisotropy in the direction that matches the magnetization direction of the product magnet can be compacted. It is possible to apply it to the surface powder.
すなわら、−軸磁気異方性が付与された成形容器内の粉
末にＮ方的圧縮力を印加しても一軸磁気異方性の“ゆら
ぎ”がなく、−軸磁気異方性の付与を圧粉成形と切離し
て行うことにより、製品磁石の着磁方向と一致する方向
の一軸磁気異方性付与を高い自由度の下で行うことがで
きる。In other words, there is no "fluctuation" in the uniaxial magnetic anisotropy even when an N-directional compressive force is applied to the powder in the molded container that has been given -axis magnetic anisotropy, and -axis magnetic anisotropy is not imparted. By performing this separately from compaction, it is possible to impart uniaxial magnetic anisotropy in a direction that coincides with the magnetization direction of the product magnet with a high degree of freedom.
また、冷間静水圧プレス法によれば、■弾性材ｎｙＪ成
形容器に充填できる寸法であれば、大きな寸法のもの、
？！２Ｍ形状のものを成形することができる、０等法的
圧縮圧で圧粉成形を行うため、均質かつ高密度（高強度
）の汁粉体を得ることができ、焼結による寸法変化が均
一で変形が少なく、歩留り良好である等の利点が得られ
る。In addition, according to the cold isostatic pressing method, ■ large-sized elastic materials that can be filled into nyJ molded containers;
? ! Because the powder compaction is carried out at zero legal compression pressure, which can form 2M shapes, it is possible to obtain a homogeneous and high density (high strength) powder, and the dimensional change due to sintering is uniform. Advantages such as less deformation and good yield can be obtained.
なお、冷開静水圧プレス法における圧縮圧は、これを０
．８〜２．０トン／ ｃｉにするのが好ましい。In addition, the compression pressure in the cold open isostatic pressing method is 0.
．． It is preferable to set it to 8-2.0 tons/ci.
その理由は、圧縮圧が０．８トン／ｄ未満では形状を保
持するための密度が得られず、取扱いの際に容易に形崩
れし、また圧縮圧が２．０／ＣＩｉを越えると、成形容
器から圧粉体を取出す際に割れが生じ易いからである。The reason for this is that if the compression pressure is less than 0.8 tons/d, the density to maintain the shape cannot be obtained and the shape will easily collapse when handled, and if the compression pressure exceeds 2.0/CIi, This is because cracks are likely to occur when the green compact is taken out from the molded container.
以）、本発明によるＮｄ１５Ｆへ８８ 製磁石の製造
方法の手順例を図面を引用しながら説明する（第４図な
いし第６図）。Hereinafter, an example of the procedure for manufacturing a Nd15F 88 magnet according to the present invention will be explained with reference to the drawings (FIGS. 4 to 6).
■真空アーク溶解法によりＮｄ −Ｆｅ −８合金（Ｎ
ｄ、Ｆｅ、、Ｂ、 ）の溶解を行う。■Nd-Fe-8 alloy (N
d, Fe, , B, ) is dissolved.
■アトマイジング法２機械的粉砕法によりＮｄ−１”ｅ
−Ｂ合金の粉末を製造する。粉末製造中および製造後の
保存中に粉末が酸化しない様に、非酸化性雰囲気を維持
する。粉末の粒仔は５μｍ以下で適当である。■Atomizing method 2 Nd-1”e by mechanical crushing method
-Produce powder of alloy B. A non-oxidizing atmosphere is maintained so that the powder does not oxidize during powder manufacture and during storage after manufacture. The particle size of the powder is suitably 5 μm or less.
■得られた粉末１をゴム製成形容器２内に充填し、界磁
１イル３によって形成される磁場中に該成形容器２を置
く。磁界Ｈ（８ＫＯ８以上）によって粉末１に磁界）（
と同方向の一軸磁気異方性が誘導される。(2) The obtained powder 1 is filled into a rubber molded container 2, and the molded container 2 is placed in a magnetic field formed by a magnetic field 1. Magnetic field H (more than 8KO8) causes powder 1 to be exposed to magnetic field) (
Uniaxial magnetic anisotropy in the same direction is induced.
■内部の粉体に一軸磁気異方性が与えられた成形容器２
を冷間静水圧プレス機に装填し、加圧流体４をもって成
形容器２内の粉末に等方的圧縮圧（０，８〜２．０トン
／ ｃｉ ）を作用さける（第６図）。■Molded container 2 with uniaxial magnetic anisotropy imparted to the powder inside
is loaded into a cold isostatic press machine, and isotropic compression pressure (0.8 to 2.0 tons/ci) is applied to the powder in the molding container 2 using the pressurized fluid 4 (FIG. 6).
■得られた圧粉体を焼結炉内に装入し、真空中（ＩＸｌ
ｏ−３丁ｏｒｒ） 、 Ｇ度１０００℃〜１１００℃１
時間１〜２時間なる条件で焼結を行う。この焼結によっ
て密度７．２〜７．３９７α３の焼結晶が得られる。■The obtained green compact is charged into a sintering furnace and placed in a vacuum (IXl
o-3 tons orr), G degree 1000℃~1100℃1
Sintering is performed under conditions of 1 to 2 hours. By this sintering, a sintered crystal having a density of 7.2 to 7.397α3 is obtained.
■焼結晶を加熱炉に装入し、時効熱処理を施す。■Place the fired crystals in a heating furnace and perform aging heat treatment.
熱処理条イ１は、真空またはアルゴンガス雰囲気。The heat treatment strip 1 is in a vacuum or argon gas atmosphere.
温度４００〜６００℃１時間１〜４時間である。この時
効熱処理によって焼結晶の保持力（＋」ｃ）が大幅に増
大する。The temperature is 400 to 600°C for 1 hour to 4 hours. This aging heat treatment significantly increases the holding power (+'c) of the fired crystal.
■時効熱処理後の焼結晶に機械加工を施して製品形状を
付与した後、強さ）（＞１４ＫＯｅの磁界により着磁を
行う。磁界の方向は前記項目■において粉体に与えられ
たーｌＮ１ｔａ気異方性の方向と同方向である。■ After applying mechanical processing to the baked crystal after aging heat treatment to give it a product shape, it is magnetized using a magnetic field of strength (>14 KOe).The direction of the magnetic field is -1N1ta given to the powder in the above item This is the same direction as the gas anisotropy.
左狡■ユ
冷間静水ｒｌ−プレス法、おＪ：び比較例としての第２
図、第３図に示すが如き金型、パンチを用いた圧粉法（
−軸プレス法）により、Ｎｄ −Ｆｅ −８合金粉末を
圧粉成形し、圧縮圧と圧粉体の密度との関係を調べた。Cold isostatic water press method, J: and the second as a comparative example.
Powder compaction method using a mold and punch as shown in Fig. 3 (
- Axial pressing method), Nd-Fe-8 alloy powder was compacted, and the relationship between the compression pressure and the density of the compact was investigated.
その結果を第７図に示す。The results are shown in FIG.
く試験結果の評価〉
同一圧縮圧の下では、−軸プレス払に比して冷間静水圧
プレス法の方が高い圧粉体密度を得ることができる。Evaluation of test results> Under the same compression pressure, the cold isostatic pressing method can obtain a higher green density than the -axial pressing method.
筬旌■ユ
Ｎ ｄ、ｓ Ｆ ｆ−ｒ＝ Ｂｓ につき、本発明方
法によって１ｑられた磁石（Ａ）、第２図図示の一輪ブ
レス法（横磁場成形法）によって得られた磁石（Ｂ）、
および第３図図示の一輪ブレス法（縦磁場成形法）によ
って（７られた磁石（Ｃ）の磁気特性（最大エネルギー
ｆｔａ （Ｂ！ｉ） ｍａｘ ）を調べたところ表１の
結果が得られた。A magnet obtained by the method of the present invention (A) and a magnet (B) obtained by the single ring press method (transverse magnetic field forming method) shown in FIG. ,
When we investigated the magnetic properties (maximum energy fta (B!i) max) of the magnet (C) which was formed by the single-ring press method (longitudinal magnetic field forming method) shown in Figure 3, the results shown in Table 1 were obtained. .
表 １
〈試験結果の評価〉
■第２図図示の横磁場成形法による磁石（Ｂ）の最大エ
ネルギー積は、第３図図示の縦磁場成形法による磁１石
（Ｃ）のそれに比して相当大きく、圧縮方向に対して直
角方向からの磁場を形成するのが有効であることが判る
。Table 1 <Evaluation of test results> ■ The maximum energy product of the magnet (B) produced by the transverse magnetic field shaping method shown in Figure 2 is higher than that of the single magnet (C) produced by the longitudinal magnetic field shaping method shown in Figure 3. It turns out that it is effective to form a considerably large magnetic field from a direction perpendicular to the compression direction.
■本発明方法による磁石（Ａ）の最大エネルギー積は、
第２図図示の横磁場成形法による磁石（Ｂ）のそれに近
い値である。それ故、表２に示す各成形方法の得失を勘
案するならば、−軸磁気異方性付与の自由度が高く、焼
結性良好なる本発明方法が他の方法に比して優れること
が明らかである（注二木発明方法による磁石は小型モー
ター等に応用可能である）。■The maximum energy product of the magnet (A) according to the method of the present invention is:
This value is close to that of the magnet (B) produced by the transverse magnetic field forming method shown in FIG. Therefore, when considering the advantages and disadvantages of each forming method shown in Table 2, the method of the present invention, which has a high degree of freedom in imparting -axial magnetic anisotropy and has good sinterability, is superior to other methods. This is obvious (note: the magnet produced by Niki's method can be applied to small motors, etc.).
表 ２
＊ただし、○は“良好”または“大”であることを意味
し、△は゛普通”、Ｘは“悪い”ことまたは“小”であ
ることをそれぞれ意味する。Table 2 *However, ○ means "good" or "large", Δ means "fair", and X means "bad" or "small".
ｌ１夏１皿
以上の説明から明らかな様に、希土類元素を含有する磁
気異方性の大きな合金の粉末を弾性材料製成形容器内に
充填し、これをｌａ磁場中置いて一輪磁気異方性を付与
し、次いで成形容Ｒごと該粉末を冷間静水圧プレス払で
圧粉成形し、１りられた圧粉体を焼結した後、これに熱
処理を施し、さらに着磁さＵることを特徴とする希土類
元素含有合金製永久磁石の製造方法が提案された。As is clear from the above explanation, powder of an alloy with large magnetic anisotropy containing rare earth elements is filled into a molded container made of an elastic material, and this is placed in a la magnetic field to obtain a single ring of magnetic anisotropy. The powder is then compacted with a cold isostatic press, and the compacted powder is sintered, heat treated, and further magnetized. A method for manufacturing permanent magnets made of rare earth element-containing alloys has been proposed.
該製造方法によれば、−軸磁気賃方性付与の自由度およ
び磁石形状選択の自由度が高く、焼結性良好であり、し
かもｔ７られた！１わの磁気特性は、圧粉成形の際に圧
縮方向に対して直角方向の磁場を形成する方法で得た磁
石のそれに十分近い。According to this manufacturing method, there is a high degree of freedom in imparting -axis magnetic properties and a high degree of freedom in selecting the magnet shape, and the sinterability is good, and moreover, it is possible to achieve t7! The magnetic properties of 1W are sufficiently close to those of a magnet obtained by a method of forming a magnetic field perpendicular to the compression direction during powder compaction.
第１図は希土類元素含有合金製永久磁石の公知の製造方
法を示す工程図、第２図、第３図はそれぞれ公知に係る
希土類元素含有合金製永久磁石の製造方法における磁場
中圧粉成形方法を示す図、第４図は本発明方法に係る工
程図、第５図は本発明方法による粉末に対するー＠磁気
異方性付与態様を示す図、第６図は該粉末を冷間静水圧
プレス法で圧粉成形する態様を示す図、第７図は冷間静
水圧プレス法および一輪プレス法による圧縮圧と圧粉体
５Ｍ度の関係を示すグラフである。
１・・・粉末、２・・・成形容器、３・・・界磁コイル
、４・・・加圧流体。Fig. 1 is a process diagram showing a known method for manufacturing a permanent magnet made of a rare earth element-containing alloy, and Figs. 2 and 3 are respectively a method for compacting powder in a magnetic field in a known method for producing a permanent magnet made of a rare earth element-containing alloy. FIG. 4 is a process diagram related to the method of the present invention, FIG. 5 is a diagram showing the manner in which magnetic anisotropy is imparted to powder by the method of the present invention, and FIG. 6 is a diagram showing how the powder is subjected to cold isostatic pressing. FIG. 7 is a graph showing the relationship between the compression pressure and the green compact 5M degree by the cold isostatic pressing method and the one-wheel pressing method. DESCRIPTION OF SYMBOLS 1... Powder, 2... Molded container, 3... Field coil, 4... Pressurized fluid.
Claims (2)
粉末を弾性材料製成形容器内に充填し、これを磁場中に
置いて一軸磁気異方性を付与し、次いで成形容器ごと該
粉末を冷間静水圧プレス法で圧粉成形し、得られた圧粉
体を焼結した後、これに熱処理を施し、さらに着磁させ
ることを特徴とする希土類元素含有合金製永久磁石の製
造方法。(1) Powder of an alloy containing rare earth elements with large magnetic anisotropy is filled into a molded container made of an elastic material, placed in a magnetic field to impart uniaxial magnetic anisotropy, and then the powder together with the molded container is A method for producing a permanent magnet made of a rare-earth element-containing alloy, which comprises compacting the powder using a cold isostatic pressing method, sintering the obtained compact, heat-treating it, and further magnetizing it. .
〜２．０トン／ｃｍ＾２であることを特徴とする特許請
求の範囲第１項に記載された希土類元素含有合金製永久
磁石の製造方法。(2) The compression pressure in the cold isostatic pressing method is 0.8
A method for producing a permanent magnet made of a rare earth element-containing alloy according to claim 1, characterized in that the magnetic flux is 2.0 tons/cm^2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6120487A JPS63227701A (en) | 1987-03-18 | 1987-03-18 | Production of permanent magnet mode of rare earth metal-containing alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6120487A JPS63227701A (en) | 1987-03-18 | 1987-03-18 | Production of permanent magnet mode of rare earth metal-containing alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63227701A true JPS63227701A (en) | 1988-09-22 |
Family
ID=13164421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6120487A Pending JPS63227701A (en) | 1987-03-18 | 1987-03-18 | Production of permanent magnet mode of rare earth metal-containing alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63227701A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2686730A1 (en) * | 1992-01-23 | 1993-07-30 | Aimants Ugimag Sa | METHOD OF ADJUSTING THE REMANENT INDUCTION OF A FRITTE MAGNET AND PRODUCT THUS OBTAINED |
| US5250255A (en) * | 1990-11-30 | 1993-10-05 | Intermetallics Co., Ltd. | Method for producing permanent magnet and sintered compact and production apparatus for making green compacts |
| US5505990A (en) * | 1992-08-10 | 1996-04-09 | Intermetallics Co., Ltd. | Method for forming a coating using powders of different fusion points |
-
1987
- 1987-03-18 JP JP6120487A patent/JPS63227701A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5250255A (en) * | 1990-11-30 | 1993-10-05 | Intermetallics Co., Ltd. | Method for producing permanent magnet and sintered compact and production apparatus for making green compacts |
| FR2686730A1 (en) * | 1992-01-23 | 1993-07-30 | Aimants Ugimag Sa | METHOD OF ADJUSTING THE REMANENT INDUCTION OF A FRITTE MAGNET AND PRODUCT THUS OBTAINED |
| US5505990A (en) * | 1992-08-10 | 1996-04-09 | Intermetallics Co., Ltd. | Method for forming a coating using powders of different fusion points |
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