JPS6376305A - Magnetic powder for plastic magnet or rubber magnet and manufacture thereof - Google Patents
Magnetic powder for plastic magnet or rubber magnet and manufacture thereofInfo
- Publication number
- JPS6376305A JPS6376305A JP61220298A JP22029886A JPS6376305A JP S6376305 A JPS6376305 A JP S6376305A JP 61220298 A JP61220298 A JP 61220298A JP 22029886 A JP22029886 A JP 22029886A JP S6376305 A JPS6376305 A JP S6376305A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- carbon
- magnetic powder
- magnetic
- rare earth
- 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
- 239000006247 magnetic powder Substances 0.000 title claims abstract description 41
- 229920003023 plastic Polymers 0.000 title claims abstract description 26
- 239000004033 plastic Substances 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 23
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 23
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 20
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 17
- 239000010941 cobalt Substances 0.000 claims abstract description 17
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000011230 binding agent Substances 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 9
- 229910000531 Co alloy Inorganic materials 0.000 claims abstract description 8
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 4
- 238000010298 pulverizing process Methods 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 abstract description 8
- 239000000956 alloy Substances 0.000 abstract description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 abstract description 7
- 239000011261 inert gas Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract 3
- 229920003188 Nylon 3 Polymers 0.000 abstract 2
- 229910052772 Samarium Inorganic materials 0.000 abstract 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 239000004677 Nylon Substances 0.000 description 4
- 239000011361 granulated particle Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229920001778 nylon Polymers 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- IUHFWCGCSVTMPG-UHFFFAOYSA-N [C].[C] Chemical compound [C].[C] IUHFWCGCSVTMPG-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent 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
- H01F1/0555—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together
- H01F1/0558—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 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)
- 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〕
プラスチック又はゴム磁石を作る時に使用する希土類コ
バルト系磁性粉及びその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to rare earth cobalt-based magnetic powder used in making plastic or rubber magnets and a method for producing the same.
従来の希土類コバルト系（例えば８ｍＣｏ ５又はＳｍ
２Ｃｏ ｌ ？ ）プラスチック磁石は次の（１１〜（
７）の工程を含んで製造嘔れている。Traditional rare earth cobalt systems (e.g. 8mCo5 or Sm
2Col? )Plastic magnets are the following (11~(
The manufacturing process includes step 7).
（１１Ｓｍ（−＋ｒ−ｖリウム） 、 Ｃｏ （コ／＜
、ｎ、 ） ）等の原材料粉末を所定の比率に秤量す
る。(11Sm(-+r-vrium), Co(ko/<
, n, )), etc., are weighed in a predetermined ratio.
（２） これを高周波加熱炉により、Ａｒ等の不活性
ガス雰囲気中で１６００〜１８００℃で溶解し。(2) This is melted at 1600 to 1800°C in an inert gas atmosphere such as Ar using a high frequency heating furnace.
しかる後冷却することによって、インゴットを得る。Thereafter, an ingot is obtained by cooling.
（３； このインゴットをボールミルによｆ７３〜９
μｍ程度に粉砕する。(3; Put this ingot into a ball mill with f73~9
Grind to about μm size.
Ｃ４） 得られた粉末？ ２０ ｋｏｅの磁場中で３
ｔ／ｃｍ’の圧力でプレス成形する。C4) Obtained powder? 3 in a magnetic field of 20 koe
Press molding at a pressure of t/cm'.
〔５１得られた成形体を不活性雰囲気中で１０５０〜１
２００℃に１時間保持した後、これを急冷して、艷に不
活性雰囲気中で６００〜９００℃に１時間保持したのち
徐冷し、焼結体を得る。[51 The obtained molded body was heated to 1050-1 in an inert atmosphere.
After being held at 200°C for 1 hour, it is rapidly cooled, kept at 600 to 900°C for 1 hour in an inert atmosphere, and then slowly cooled to obtain a sintered body.
（６１得られた焼結体をボールミルで粉砕して３〜２０
ｔｔ ｍ （Ｓｍ２Ｃｏｌｙ系では５〜６０μｍ）の
粉末を得る。(61 The obtained sintered body was crushed with a ball mill to give a
A powder of tt m (5 to 60 μm for Sm2Coly system) is obtained.
（７１得られた粉末とナイロンとを混合し、磁場中で射
出成形する。(71 The obtained powder and nylon are mixed and injection molded in a magnetic field.
プラスチック磁石の最大エネルギー積は焼結磁石の５０
％程度しか得られないので、最大エネルギー積を向上ざ
ゼるためＫは、プラスチック磁石中の磁性粉の含有率（
ｖｏ１％）を高める必要がある。しかしながら、従来の
希土類コバルト系磁性粉を用い念プラスチック磁石では
、この最大エネルギー積を向上させるために磁性粉の含
有率７大きくすると、加圧成形で得られた成形体を熱処
理で硬化きせる際にクラックが発生しやす＜、裂品歩留
まりが著しく低かった。そのため実用上、希土類コバル
ト系磁性粉の含有率は７０ ｖｏ１％以下忙制限され、
ｊＩ大エネルギー積の高いプラスチック磁石を得ること
は困難であった。The maximum energy product of plastic magnets is 50 that of sintered magnets.
%, so in order to improve the maximum energy product, K is the content of magnetic powder in the plastic magnet (
VO1%) needs to be increased. However, in conventional plastic magnets using rare earth cobalt-based magnetic powder, if the content of magnetic powder is increased by 7 to improve this maximum energy product, it will be difficult to harden the compact obtained by pressure molding by heat treatment. Cracks were likely to occur, and the yield of broken products was extremely low. Therefore, in practical terms, the content of rare earth cobalt magnetic powder is limited to 70 VO1% or less.
It has been difficult to obtain a plastic magnet with a high jI large energy product.
そこで１本願の第１番目の発明の目的は、プラスチック
又はゴムに対する結合力が大きい希土類コバルト系磁性
粉を提供することＫある。Therefore, an object of the first invention of the present application is to provide a rare earth cobalt-based magnetic powder that has a large bonding force to plastic or rubber.
本願の第２番目の発明は、プラスチック又はゴムに対す
る結合力の大きい希土類コバルト系磁性粉を容易に得る
ことができる製造方法を提供することＫある。The second invention of the present application is to provide a manufacturing method that can easily obtain rare earth cobalt-based magnetic powder that has a strong bonding force to plastic or rubber.
上記問題点を解決し、上記目的を達成する念めの本願の
第１番目の発明に係わるプラスチック又はゴム磁石用希
土類コバルト系磁性粉は、希土類コバルト系磁性粉の表
面に炭素Ｃカーボン）被膜又は粒子を有することを特徴
とするものである。A rare earth cobalt based magnetic powder for plastic or rubber magnets according to the first invention of the present application which aims to solve the above problems and achieve the above object is provided with a carbon (C) or carbon (carbon) coating or It is characterized by having particles.
本願の第２番目の発明は、希土類コバルト系合金粉末を
磁場中でプレス成形する際に、希土類コバルト系合金粉
末に炭素原子を含む有機バインダ及び／又は炭素粉末を
加えて磁場中でプレス成形し、しかる後不活性ガス雰囲
気中で熱処理し、粉砕することを特徴とするものである
。The second invention of the present application is to press-form rare earth cobalt-based alloy powder in a magnetic field by adding an organic binder and/or carbon powder containing carbon atoms to the rare-earth cobalt-based alloy powder, and press-forming the rare earth cobalt-based alloy powder in a magnetic field. , and then heat-treated in an inert gas atmosphere and pulverized.
本願の第１及び第２の発明に係わる炭素被膜又は粒子は
、磁性粉とプラスチック又はゴムとの間に介在して両者
を強固に結合させるために寄与する。The carbon coating or particles according to the first and second inventions of the present application are interposed between the magnetic powder and the plastic or rubber and contribute to strongly bonding the two.
本願の第２番目の発明において、磁場中でプレス成形す
る際に、有機バインダ及び／又は炭素粉末ン混入させる
と、熱処理工程にＳいて、磁性粉の表面に炭素が固着し
、これがプラスチック又はゴムに対する結合力増大に寄
与する。In the second invention of the present application, if an organic binder and/or carbon powder is mixed during press molding in a magnetic field, carbon will adhere to the surface of the magnetic powder during the heat treatment process, and this will lead to plastic or rubber particles. Contributes to an increase in bonding strength.
次に１本発明の実施例に係わる希土類コバルト系磁性粉
及びこれケ使用したプラスチック磁石を説明する。Next, a rare earth cobalt magnetic powder and a plastic magnet using the same according to an embodiment of the present invention will be explained.
（実施例１）
８ｍ （ｖ？リウＡ ）’ｌ’１５０．３５ ｇ、
Ｃｏ （コバルト）を５００．９３ ｇ秤量し、これ等
の混合物を高周波加熱炉によってＡ「ガス雰囲気中で１
６００〜１８００℃に加熱浴Ｍ−Ｘせ、しかる後冷却し
てインゴット（希土類コバルト系合金の塊）を得た。(Example 1) 8m (v?Riu A)'l'150.35 g,
500.93 g of Co (cobalt) was weighed, and the mixture was heated in a high-frequency heating furnace in a gas atmosphere.
The mixture was heated to 600 to 1800°C in a heating bath M-X, and then cooled to obtain an ingot (a lump of rare earth cobalt alloy).
次に、インゴットをボールミルで３〜９μｍに粉砕し、
サマリウム・コバルト合金の粉末を得た。Next, the ingot was ground to 3 to 9 μm using a ball mill,
A samarium-cobalt alloy powder was obtained.
次に、サマリウム・コバルト合金粉末５００ｇに対して
炭素原子？含む有機バインダとしてのポリビニルアルコ
ールの３０％水溶液ｖ１０ｏｇ加え、ライカイ機で２０
分間混合し、６０メツシユパスの造粒粒子を得な。得ら
れた造粒粒子を２０ｋｏｅの磁場中Ｋ ｊｅｔ ｔ／）
て（１，２ｔ／ｃｍ”の圧力でプレス成形した。Next, carbon atoms for 500g of samarium-cobalt alloy powder? Add 10 og of a 30% aqueous solution of polyvinyl alcohol as an organic binder containing
Mix for 60 mesh passes to obtain granulated particles. The obtained granulated particles were placed in a magnetic field of 20 koe (K jet t/)
Press molding was carried out at a pressure of 1.2 t/cm''.
次に、プレス成形体をＡｒガス雰囲気中で１０５０〜ｂ
しかる後金、冷し、史ＫＡｒガス雰囲気中で６００へ９
００℃？３０分間保持するように熱処理し、その後徐冷
し之。この工程で成形体を熱処理すると。Next, the press-formed body was heated to 1050 to 90% in an Ar gas atmosphere, then cooled and heated to 600% in an Ar gas atmosphere.
00℃? Heat treated for 30 minutes and then slowly cooled. When the molded body is heat-treated in this process.
ポリビニルアルコール溶液の溶媒は蒸発し、同時にポリ
ビニルアルコールが分解し、ポリビニル了ルコールを構
成する酸素及び水素は蒸発する。しかし、炭素は磁性粉
（結晶粒）の表面に強く結合した状態で残る。The solvent of the polyvinyl alcohol solution evaporates, and at the same time the polyvinyl alcohol decomposes, and the oxygen and hydrogen constituting the polyvinyl alcohol evaporate. However, carbon remains strongly bonded to the surface of the magnetic powder (crystal grains).
次に、熱処理した成形体をボールミルで粉砕し。Next, the heat-treated molded body was ground in a ball mill.
３〜２０μｍのサマリウム・コバルト磁性粉とする。有
機バインダー中の炭素が磁性粉の緻密化を防いでいるの
で、容易に粉砕することができる。A samarium-cobalt magnetic powder with a diameter of 3 to 20 μm is used. Since the carbon in the organic binder prevents the magnetic powder from becoming dense, it can be easily pulverized.
第１図は磁性粉（１）の表面に炭素被膜（２１が固着し
ている状態を原理的に示す。FIG. 1 basically shows a state in which a carbon film (21) is adhered to the surface of magnetic powder (1).
次に、射出成形物における磁性粉の含有率が表に示す値
（６５，７０，７５，８０，８５，９０ｖｏ１％）にな
るよう忙、炭素被膜を有する磁性粉とナイロンとを種々
の割合に混合し、磁場中で射出成形し、第２図に原理的
に示すような炭素被膜（２）を有する磁性粉（１）の相
互間をナイロン＋３１で結合させたプラスチック磁石を
得た。なお、各磁性粉含有率において５０個の試料（プ
ラスチック磁石）を作った。Next, the carbon-coated magnetic powder and nylon were mixed in various ratios so that the content of the magnetic powder in the injection molded product was the value shown in the table (65, 70, 75, 80, 85, 90vo1%). The mixture was mixed and injection molded in a magnetic field to obtain a plastic magnet in which magnetic powder (1) having a carbon coating (2) was bonded with nylon +31 as shown in principle in FIG. Note that 50 samples (plastic magnets) were made at each magnetic powder content rate.
しかる後、各磁性粉含有率のプラスチック磁石のクラッ
クの発生率（％］を調べたところ１表に示す通りであっ
た。この結果から明らかな如く、ａ１性粉な８０ ｖｏ
１％混入させてもクラックが発生しない。After that, the crack occurrence rate (%) of plastic magnets with each magnetic powder content was investigated and the results were as shown in Table 1.As is clear from this result, 80 vo, which is an A1 powder,
No cracks occur even if 1% is mixed.
比較のために、ポリビニルアルコールに基づく炭素被膜
（２）を設けない磁性粉を実施例１と同一の方法で作り
、実施例１と同一の方法でプラスチック磁石を作り、ク
ラックの発生を調べたところ。For comparison, magnetic powder based on polyvinyl alcohol without the carbon coating (2) was made in the same manner as in Example 1, and a plastic magnet was made in the same manner as in Example 1, and the occurrence of cracks was examined. .
表の従来例の欄に示″ｆＭ果となった。実施例１と従来
例との比較から明らかな如（、従来例ではＳｍＣｏ５プ
ラスチック磁石、 ８ｍ？Ｃｏ１７プラスチツク磁石の
両方忙おいて磁性粉含有率７５ ｖｏ１％からクラック
の発生が見られるが１本発明に係わる実施例１では８０
ｖｏ１％まではクラックの発生が見られない。従って
１本発明の磁性粉を使用すると。The "fM" results are shown in the conventional example column of the table. Cracks can be seen starting from a rate of 75 vo1%, but in Example 1 according to the present invention, it is 80
No cracks were observed up to vo1%. Therefore, if the magnetic powder of the present invention is used.
この含有率を多（してプラスチック磁石の最大エネルギ
ー積な向上さセることが可能になる。By increasing this content, it becomes possible to increase the maximum energy product of plastic magnets.
表 （クラック発生率１）
（５ｊ！施例２〕
別の組成の希土類コバルト系磁性粉に対しても不発明を
適用することができることを確かめろために、Ｓｍを２
７５ｇ、 りｉ Ｙ ６，６ ｇ、 Ｃｕを８６ｇ。Table (Crack occurrence rate 1) (5j! Example 2) In order to confirm that the invention can be applied to rare earth cobalt magnetic powder with a different composition, Sm was
75g, 6.6g of Ri Y, 86g of Cu.
ＦｅＹ １１７ｇ、Ｃｏｖ４５６ ｇ秤量し、実施例１
と同一の方法で溶解、冷却してインボラトラ作り。Weighed 117 g of FeY, 456 g of Cov, Example 1
Melt and cool to make inboratora using the same method as above.
これを粉砕して６〜６０μｍの粉末を得た。This was pulverized to obtain a powder of 6 to 60 μm.
次に、この合金粉末５００ｇに対して、ポリビニルアル
コール３０％水溶液５０ｇ、！：、粒径５〜２０μｍの
カーボン１０ｇとを加え、ライカイ機で２０分間混合し
、６０メツシユパスの造粒粒子ン得念。Next, for 500 g of this alloy powder, 50 g of a 30% polyvinyl alcohol aqueous solution! : Add 10 g of carbon with a particle size of 5 to 20 μm, mix for 20 minutes in a light machine, and obtain granulated particles for 60 mesh passes.
次に、得られた造粒粒子を２０ ｋＯｅの磁場中圧おい
て０．５ ｔ／ Ｃｍ’の圧力でプレス成形し、しかる
後、実施例１と同じ方法で焼成、粉砕することによって
炭素被膜を有する６〜６０μｍの磁性粉を得た。Next, the obtained granulated particles were press-molded at a pressure of 0.5 t/Cm' in a magnetic field of 20 kOe, and then fired and crushed in the same manner as in Example 1 to form a carbon coating. A magnetic powder having a diameter of 6 to 60 μm was obtained.
この磁性粉を使用して実施例１と同一の方法でプラスチ
ック磁石を作り、クラックの発生率を調べたところ１表
に示す結果が得られた。この結果から明らかな如＜、
ＳｍＴｉ ＣｕＦｅＣｏから成る希土類コバルト系磁性
粉であってもＳｍ ｃｏ磁性粉と同一の作用効果が得ら
れる。A plastic magnet was made using this magnetic powder in the same manner as in Example 1, and the crack occurrence rate was examined, and the results shown in Table 1 were obtained. It is clear from this result that
Even with rare earth cobalt-based magnetic powder made of SmTi CuFeCo, the same effects as Sm co magnetic powder can be obtained.
本発明は、上述の実施例に限定されるものでなく、変形
可能なものである。例えば、希土類コバルト系原料合金
粉末に炭素粉末のみを混合して造粒、磁場中成形しても
よい。また、希土類コバルト系原料合金粉末に加える有
機バインダー及び／又は炭素粉末の量は、原料合金粉末
に対して炭素の量で０．０１へ５：８４１％の範囲が好
ましいことが離間されている。（１，０１重量る未満に
なると、炭素被膜の効果が明らかに判別できなくなり、
５事貴重を越えると、磁性粉に固着されない炭素が存在
するようになり、成形性が悪化する。The invention is not limited to the embodiments described above, but can be modified. For example, only carbon powder may be mixed with rare earth cobalt-based raw material alloy powder, granulated, and compacted in a magnetic field. Furthermore, the amount of the organic binder and/or carbon powder added to the rare earth cobalt-based raw material alloy powder is preferably in the range of 0.01 to 5:841% in terms of the amount of carbon relative to the raw material alloy powder. (If the weight is less than 1.01%, the effect of the carbon film cannot be clearly determined,
If the value exceeds 5, there will be carbon that is not fixed to the magnetic powder, resulting in poor moldability.
上述から明らかな如く１本願の第】番目及び第２番目の
発明によれば、プラスチック又はゴムに対する結合力の
強い磁性粉を提供することができる。従って、磁性粉の
含有率を高めてもプラスチック又はゴム磁石のクラック
が発生し忙＜＜なり。As is clear from the above, according to the second and second aspects of the present invention, it is possible to provide magnetic powder that has a strong bonding force to plastic or rubber. Therefore, even if the content of magnetic powder is increased, cracks may occur in the plastic or rubber magnet.
最大エネルギー積の向上が可能になる。また１本願の第
２番目の発明によれば、原料合金粉末の熱処理前に有機
バインダー及び／又は炭素粉末を加えるので、磁性粉の
表面に強く固湛・シた炭素被膜又は粒子？容易に得るこ
とができる。It becomes possible to improve the maximum energy product. Moreover, according to the second invention of the present application, since an organic binder and/or carbon powder is added before the heat treatment of the raw material alloy powder, the surface of the magnetic powder is strongly impregnated with a carbon film or particles. can be obtained easily.
第１図は本発明の実施例に従う炭素被膜を有する磁性粉
を原理的に示す断面図。
第２図は不発明の実施例に従うプラスチック磁石？原理
的に示す断面図である。
１１１・・磁性粉、（２）・・・炭素被膜、（３）・・
・ナイロン。
代 理 人 高 野 則 次第２図FIG. 1 is a sectional view showing the principle of magnetic powder having a carbon coating according to an embodiment of the present invention. FIG. 2 shows a plastic magnet according to an uninvented embodiment? FIG. 2 is a sectional view showing the principle. 111...Magnetic powder, (2)...Carbon coating, (3)...
·Nylon. Agent: Nori Takano Figure 2
Claims (2)
素粒子を固着させたことを特徴とするプラスチック又は
ゴム磁石用磁性粉。(1) Magnetic powder for plastic or rubber magnets, characterized in that a carbon film or carbon particles are fixed to the surface of rare earth cobalt-based magnetic powder.
と、 前記希土類コバルト系合金粉末に、炭素原子を含む有機
バインダ及び／又は炭素粉末を加えて磁場中でプレス成
形する工程と、 前記プレス成形で得られた成形体を不活性ガス雰囲気中
で熱処理する工程と、 前記熱処理を施した成形体をプラスチック又はゴム磁石
に適合するように粉砕し、炭素被膜又は炭素粒子が表面
に固着された希土類コバルト系磁性粉を得る工程と を含むことを特徴とするプラスチック又はゴム磁石用希
土類コバルト系磁性粉の製造方法。(2) a step of preparing a lump of rare earth cobalt alloy; a step of crushing the lump to obtain rare earth cobalt alloy powder; and adding an organic binder containing carbon atoms to the rare earth cobalt alloy powder and/or carbon powder. a step of press-forming in a magnetic field with the addition of a A method for producing rare earth cobalt magnetic powder for use in plastic or rubber magnets, comprising the step of pulverizing rare earth cobalt magnetic powder having a carbon film or carbon particles fixed to its surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61220298A JPS6376305A (en) | 1986-09-18 | 1986-09-18 | Magnetic powder for plastic magnet or rubber magnet and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61220298A JPS6376305A (en) | 1986-09-18 | 1986-09-18 | Magnetic powder for plastic magnet or rubber magnet and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6376305A true JPS6376305A (en) | 1988-04-06 |
Family
ID=16748965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61220298A Pending JPS6376305A (en) | 1986-09-18 | 1986-09-18 | Magnetic powder for plastic magnet or rubber magnet and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6376305A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1583111A1 (en) * | 2003-01-10 | 2005-10-05 | Neomax Co., Ltd. | Oxidation-resistant rare earth based magnet powder and method for production thereof, compound for rare earth based bonded magnet, rare earth based bonded magnet and method for production thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51125625A (en) * | 1975-01-20 | 1976-11-02 | Hitachi Magnetics Corp | Method of manufacturing intermetallic compound of cobalt and rare earth metals |
| JPS5416698A (en) * | 1978-07-24 | 1979-02-07 | Seiko Epson Corp | Preparing permanent magnet |
| JPS5940501A (en) * | 1982-08-30 | 1984-03-06 | Inoue Japax Res Inc | Carbon-containing permanent magnet |
| JPS5961903A (en) * | 1982-09-30 | 1984-04-09 | Sony Corp | Manufacture of acicular magnetic metal powder |
| JPS61208806A (en) * | 1985-03-13 | 1986-09-17 | Hitachi Metals Ltd | Surface treating method and permanent magnet |
-
1986
- 1986-09-18 JP JP61220298A patent/JPS6376305A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51125625A (en) * | 1975-01-20 | 1976-11-02 | Hitachi Magnetics Corp | Method of manufacturing intermetallic compound of cobalt and rare earth metals |
| JPS5416698A (en) * | 1978-07-24 | 1979-02-07 | Seiko Epson Corp | Preparing permanent magnet |
| JPS5940501A (en) * | 1982-08-30 | 1984-03-06 | Inoue Japax Res Inc | Carbon-containing permanent magnet |
| JPS5961903A (en) * | 1982-09-30 | 1984-04-09 | Sony Corp | Manufacture of acicular magnetic metal powder |
| JPS61208806A (en) * | 1985-03-13 | 1986-09-17 | Hitachi Metals Ltd | Surface treating method and permanent magnet |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1583111A1 (en) * | 2003-01-10 | 2005-10-05 | Neomax Co., Ltd. | Oxidation-resistant rare earth based magnet powder and method for production thereof, compound for rare earth based bonded magnet, rare earth based bonded magnet and method for production thereof |
| EP1583111A4 (en) * | 2003-01-10 | 2006-03-15 | Neomax Co Ltd | Oxidation-resistant rare earth based magnet powder and method for production thereof, compound for rare earth based bonded magnet, rare earth based bonded magnet and method for production thereof |
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