JPH09227968A - Manufacture of cobalt-base alloy for magnetic recording medium - Google Patents
Manufacture of cobalt-base alloy for magnetic recording mediumInfo
- Publication number
- JPH09227968A JPH09227968A JP8038426A JP3842696A JPH09227968A JP H09227968 A JPH09227968 A JP H09227968A JP 8038426 A JP8038426 A JP 8038426A JP 3842696 A JP3842696 A JP 3842696A JP H09227968 A JPH09227968 A JP H09227968A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- magnetic recording
- recording medium
- vacuum
- cobalt
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Physical Vapour Deposition (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、磁気記録媒体用
合金、特にコバルト基合金の製造方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an alloy for a magnetic recording medium, particularly a cobalt base alloy.
【０００２】[0002]
【従来の技術とその課題】従来より、磁気記録媒体用材
料として、Ｎｉを１５〜２５重量％含有し、残部がＣｏ
と不可避不純物から成る組織を有するＣｏ−Ｎｉ合金が
その代表的なものとして知られており、原料成分を真空
溶解した後、鋳造して得られたインゴットを鍛伸し、切
断、研削などすることにより所定寸法の素材とし、この
ものを磁気ディスク、フロッピーディスク、オーディオ
用磁気テープの表面にスパッタリング法、真空蒸着法な
どの表面処理技術により、薄膜を形成するようにしてい
る。2. Description of the Related Art Conventionally, as a material for a magnetic recording medium, Ni is contained in an amount of 15 to 25% by weight, and the balance is Co.
A Co-Ni alloy having a structure composed of unavoidable impurities is known as a typical one, and the raw material components are vacuum melted, and the ingot obtained by casting is forged, cut, and ground. A material having a predetermined size is formed on the surface of a magnetic disk, a floppy disk or an audio magnetic tape by a surface treatment technique such as a sputtering method or a vacuum deposition method.
【０００３】しかしながら、このようなＣｏ基合金は、
必要とされる特性を有する磁気記録媒体用の薄膜を形成
するためには、真空溶解により前記の素材を製造し、Ｎ
2 やＯ2 などのガスの発生を抑えられたものとすること
が必要である。それと言うのも、磁気記録媒体の製造に
おいて、特に真空蒸着時に前記合金を電子ビームにより
蒸発させる場合にガスが発生すると、磁性層の厚みむら
や、ピンホールなどの発生原因となるからである。特に
このようなガスの発生が多い時には、突沸現象が生じ、
真空蒸着装置が破損する恐れさえもある。However, such Co-based alloys are
In order to form a thin film for a magnetic recording medium having the required characteristics, the above materials are manufactured by vacuum melting and N
It is necessary to suppress the generation of gases such as 2 and O 2 . This is because, in the production of a magnetic recording medium, if a gas is generated especially when the alloy is evaporated by an electron beam during vacuum evaporation, it may cause uneven thickness of the magnetic layer and pinholes. Especially when such gas is generated a lot, bumping phenomenon occurs,
There is even a risk that the vacuum deposition device will be damaged.
【０００４】しかしながら、これまでの技術では、上記
のＣｏ基合金を真空蒸着用の素材として使用しても、発
生するガス量が少なく、突沸現象の発生も無く、しか
も、製造価格を低下させることができる合金ターゲット
材として適している磁気記録媒体用Ｃｏ基合金を得るこ
とには、必ずしも充分な効果が得られていないのが実情
である。However, in the conventional techniques, even when the above Co-based alloy is used as a material for vacuum deposition, the amount of gas generated is small, the bumping phenomenon does not occur, and the manufacturing cost is reduced. In reality, it is not always possible to obtain a sufficient effect in obtaining a Co-based alloy for a magnetic recording medium that is suitable as an alloy target material that can be obtained.
【０００５】そこで、この発明は、以下のとおりの従来
技術の課題を解消し、電子ビーム溶解時に突沸現象の発
生もなく、優れた磁気特性をも実現することのできる新
しい磁気記録媒体用のコバルト基合金の製造方法を提供
することを目的としている。Therefore, the present invention solves the problems of the prior art as described below, does not cause the bumping phenomenon at the time of electron beam melting, and is a new cobalt for a magnetic recording medium capable of realizing excellent magnetic characteristics. It is intended to provide a method for producing a base alloy.
【０００６】[0006]
【課題を解決するための手段】この発明は、上記の課題
を解決するものとして、真空蒸着により成膜する磁気記
録媒体用の次の組成；Ｎｉ：５〜２５重量％、Ｃ：０．
００５重量％以下、Ｍｎ：０．０１〜０．１０重量％、
Ａｌ：０．００２〜０．０１重量％、Ｏ：０．００５０
重量％以下、Ｎ：０．００１０重量％以下、Ｃｏおよび
不可避的不純物：残部を有するコバルト基合金の製造方
法であって、真空誘導溶解に続いて真空アーク再溶解を
行うことを特徴とする磁気記録媒体用コバルト基合金の
製造方法を提供する。In order to solve the above-mentioned problems, the present invention has the following composition for a magnetic recording medium formed by vacuum evaporation; Ni: 5 to 25% by weight, C: 0.
005% by weight or less, Mn: 0.01 to 0.10% by weight,
Al: 0.002-0.01% by weight, O: 0.0050
A method for producing a cobalt-based alloy having a weight% or less, N: 0.0010% by weight or less, Co and inevitable impurities: the balance, characterized by performing vacuum arc remelting followed by vacuum arc remelting. A method for manufacturing a cobalt-based alloy for a recording medium is provided.
【０００７】また、この発明は、上記の方法において、
ＣａおよびＭｇが、各々０．００１〜０．００５重量％
含有されていることや、Ｓｉが０．０１〜０．１０重量
％含有されていること等もその一つの態様として提供す
る。The present invention also provides, in the above method,
Ca and Mg are 0.001 to 0.005% by weight, respectively
The inclusion of Si, 0.01 to 0.10 wt% of Si, and the like are also provided as one aspect thereof.
【０００８】[0008]
【発明の実施の形態】この発明は、上記の構成を特徴と
しているが、このことは、この発明の発明者によって得
られた、真空誘導溶解（ＶＩＦ）と、これに続く真空ア
ーク再溶解（ＶＡＲ）とによって二重真空溶解を行うこ
とが、得られたコバルト基合金の電子ビーム溶解による
蒸着時の突沸現象を抑え、高特性の磁気記録媒体を得る
のに極めて有効であり、製造工程、価格の上からも有利
であるとの新しい知見に基づいている。BEST MODE FOR CARRYING OUT THE INVENTION The present invention is characterized by the above-mentioned structure, which is obtained by the inventor of the present invention by vacuum induction melting (VIF) followed by vacuum arc remelting (VIF). VAR) and double vacuum melting are extremely effective in suppressing the bumping phenomenon at the time of vapor deposition of the obtained cobalt-based alloy by electron beam melting and obtaining a magnetic recording medium with high characteristics. It is based on a new finding that it is advantageous in terms of price.
【０００９】より詳しく説明すると、まず、この発明に
よる磁気記録媒体用Ｃｏ基合金は、前記のような化学成
分を有するものであるが、各化学成分の組成範囲に限定
した理由は以下のとおりである。 Ｃ：０．００５重量％を超過すると真空蒸着時の電子ビ
ーム溶解時に突沸現象を生ずるので、好ましくない。More specifically, the Co-based alloy for magnetic recording media according to the present invention has the chemical components as described above, but the reason for limiting the composition range of each chemical component is as follows. is there. C: If it exceeds 0.005% by weight, a bumping phenomenon occurs during melting of the electron beam during vacuum deposition, which is not preferable.
【００１０】Ｍｎ：０．０１重量％未満の場合は突沸を
防止できない。０．１重量％を超過すると、浴面をスカ
ムが覆うので好ましくない。 Ａｌ：強力な脱酸剤であり、Ｍｎと同様突沸現象を防止
するために必要である。また合金素材に残留すると、磁
気特性のむらが生じるので、０．００２〜０．０１重量
％が好ましい。If Mn is less than 0.01% by weight, bumping cannot be prevented. If it exceeds 0.1% by weight, the scum covers the bath surface, which is not preferable. Al: It is a strong deoxidizer and is necessary to prevent the bumping phenomenon like Mn. Further, when it remains in the alloy material, uneven magnetic properties occur, so 0.002 to 0.01% by weight is preferable.
【００１１】Ｏ（酸素）：０．００５０重量％を超える
と突沸現象を生じやすくなるので好ましくない。 Ｎ（窒素）：０．００１０重量％を超えると同様に突沸
現象を生じやすくなるので好ましくない。 また、この発明では、以下の限定も一つの態様としてい
る。O (oxygen): If it exceeds 0.0050% by weight, the bumping phenomenon tends to occur, which is not preferable. N (nitrogen): If it exceeds 0.0010% by weight, the bumping phenomenon is likely to occur, which is not preferable. Further, in the present invention, the following limitation is also one aspect.
【００１２】Ｃａ、Ｍｇ：脱酸剤として使用されるもの
であり、０．００１重量％未満では、突沸現象の抑制に
効果はなく、０．０１０重量％を超える場合には磁気特
性を損う原因となる。このため、０．００１〜０．００
５重量％が好ましい範囲である。 Ｓｉ：脱酸剤であり、同様の理由によって、０．０１〜
０．１０重量％とするのが好ましい。Ca, Mg: Used as a deoxidizing agent. If less than 0.001% by weight, there is no effect in suppressing the bumping phenomenon, and if more than 0.010% by weight, the magnetic properties are impaired. Cause. Therefore, 0.001 to 0.00
A preferable range is 5% by weight. Si: a deoxidizer, and for the same reason, 0.01 to
It is preferably 0.10% by weight.
【００１３】各化学成分は上記のような理由により決定
されたものであるが、これらの範囲を外れると、真空蒸
着上並びに磁気特性上に不都合が生ずる。そして、この
発明では、上記の組成となるように原料成分を配合し、
浴湯を真空誘導溶解（ＶＩＦ）してＣｏ−Ｎｉの配合を
調整し、均一な浴湯が得られた段階において、Ｍｎ、Ａ
ｌ等の脱酸元素を添加し、酸素と反応させてスカムとし
て除去し、インゴットを製造する。Each chemical component is determined for the above reasons, but if it deviates from these ranges, problems occur in vacuum deposition and magnetic properties. And in this invention, the raw material components are blended so as to have the above composition,
At the stage where a uniform bath water was obtained by adjusting the composition of Co-Ni by vacuum induction melting (VIF) of the bath water, Mn, A
A deoxidizing element such as 1 is added, reacted with oxygen and removed as scum to produce an ingot.
【００１４】次いで、さらに、真空アーク再溶解（ＶＡ
Ｒ）を行う。二重に真空溶解が行われることになる。次
いでこのようにして得られたＣｏ−Ｎｉ基合金から成る
インゴットを通常の熱間圧延又は鍛造により熱間加工を
行った後、機械加工により所定の寸法に切断し、磁気記
録媒体用のＣｏ基合金の素材を得ることができる。以
下、実施例を示し、さらに詳しくこの発明の実施の形態
について説明する。Then, the vacuum arc remelting (VA
R). Double vacuum melting will be performed. Then, the ingot made of the Co--Ni based alloy thus obtained is subjected to hot working by ordinary hot rolling or forging, and then cut into a predetermined size by machining to obtain a Co base for a magnetic recording medium. The alloy material can be obtained. Hereinafter, examples will be shown, and embodiments of the present invention will be described in more detail.
【００１５】[0015]
【実施例】Ｃｏ及びＮｉ等を原料として真空誘導溶解炉
において約１，５５０℃で溶解し、均一な溶湯が得られ
た段階で必要に応じてＭｎ、Ａｌ、Ｃａ、ＭｇおよびＳ
ｉを添加し、真空処理を施してインゴットを作成した。
このものの組成は、表１のとおりであった。このもの
を、真空アーク溶解炉（ＶＡＲ）で再溶解し、インゴッ
トを作成した。このものの組成は、表１に示したとおり
であった。[Examples] Co, Ni, etc. were melted at about 1,550 ° C. in a vacuum induction melting furnace, and Mn, Al, Ca, Mg and S were added as necessary at the stage when a uniform molten metal was obtained.
i was added and vacuum treatment was performed to prepare an ingot.
The composition of this product was as shown in Table 1. This was remelted in a vacuum arc melting furnace (VAR) to prepare an ingot. The composition of this product was as shown in Table 1.
【００１６】得られたインゴットを鍛造し、かつ、小片
の蒸着材とした。この蒸着材を用いて電子ビーム溶解に
より真空蒸着して成膜した。ガスによるピンホールの発
生、そして突沸現象の発生も見られなかった。さらに表
２に示すように、成膜後の磁気記録媒体の、保磁力（Ｈ
ｃ）、飽和磁束密度（Ｂｓ）は、従来材との間に差が認
められないものであった。The obtained ingot was forged and used as a vapor deposition material in small pieces. A film was formed by vacuum evaporation using this evaporation material by electron beam melting. Neither generation of pinholes due to gas nor occurrence of bumping phenomenon was observed. Further, as shown in Table 2, the coercive force (H
c) and the saturation magnetic flux density (Bs) had no difference from the conventional material.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 [Table 2]
【００１９】[0019]
【発明の効果】以上詳しく説明したとおり、この発明に
よる磁気記録媒体用Ｃｏ基合金の製造方法では、磁気特
性も実用上問題なく良好であり、突沸現象がなく、ピン
ホールや厚みのムラのない磁性層を得ることができると
いう優れた効果を発揮する。As described in detail above, in the method for producing a Co-based alloy for a magnetic recording medium according to the present invention, the magnetic properties are satisfactory without any practical problems, there is no bumping phenomenon, and there are no pinholes or uneven thickness. It has an excellent effect that a magnetic layer can be obtained.
Claims (3)
の次の組成； Ｎｉ：５〜２５重量％、 Ｃ：０．００５重量％以下、 Ｍｎ：０．０１〜０．１０重量％、 Ａｌ：０．００２〜０．０１重量％、 Ｏ：０．００５０重量％以下、 Ｎ：０．００１０重量％以下、 Ｃｏおよび不可避的不純物：残部 を有するコバルト基合金の製造方法であって、真空誘導
溶解に続いて真空アーク再溶解を行うことを特徴とする
磁気記録媒体用コバルト基合金の製造方法。1. The following composition for a magnetic recording medium formed by vacuum evaporation: Ni: 5 to 25% by weight, C: 0.005% by weight or less, Mn: 0.01 to 0.10% by weight, Al : 0.002-0.01% by weight, O: 0.0050% by weight or less, N: 0.0010% by weight or less, Co and unavoidable impurities: A method for producing a cobalt-based alloy having the balance, which is vacuum-induced. A method for producing a cobalt-based alloy for magnetic recording media, which comprises melting and then remelting in a vacuum arc.
０．００５重量％含有されている請求項１の製造方法。2. Ca and Mg are each 0.001 to 0.001.
The manufacturing method according to claim 1, wherein the content is 0.005% by weight.
れている請求項１または２の製造方法。3. The method according to claim 1, wherein Si is contained in an amount of 0.01 to 0.10% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8038426A JPH09227968A (en) | 1996-02-26 | 1996-02-26 | Manufacture of cobalt-base alloy for magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8038426A JPH09227968A (en) | 1996-02-26 | 1996-02-26 | Manufacture of cobalt-base alloy for magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09227968A true JPH09227968A (en) | 1997-09-02 |
Family
ID=12524996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8038426A Pending JPH09227968A (en) | 1996-02-26 | 1996-02-26 | Manufacture of cobalt-base alloy for magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09227968A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009074175A (en) * | 2008-09-29 | 2009-04-09 | Mitsubishi Materials Corp | Stock for vapor deposition, and information recording medium |
-
1996
- 1996-02-26 JP JP8038426A patent/JPH09227968A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009074175A (en) * | 2008-09-29 | 2009-04-09 | Mitsubishi Materials Corp | Stock for vapor deposition, and information recording medium |
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