JPH0380430A - Production of magnetic recording medium - Google Patents
Production of magnetic recording mediumInfo
- Publication number
- JPH0380430A JPH0380430A JP21684589A JP21684589A JPH0380430A JP H0380430 A JPH0380430 A JP H0380430A JP 21684589 A JP21684589 A JP 21684589A JP 21684589 A JP21684589 A JP 21684589A JP H0380430 A JPH0380430 A JP H0380430A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- coating
- liquid
- recording medium
- thickness
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000011248 coating agent Substances 0.000 claims abstract description 51
- 238000000576 coating method Methods 0.000 claims abstract description 51
- 239000002904 solvent Substances 0.000 claims abstract description 34
- 239000010687 lubricating oil Substances 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 31
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 8
- 239000011241 protective layer Substances 0.000 claims description 5
- 230000001050 lubricating effect Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000010408 film Substances 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- ZGDWHDKHJKZZIQ-UHFFFAOYSA-N cobalt nickel Chemical compound [Co].[Ni].[Ni].[Ni] ZGDWHDKHJKZZIQ-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 125000004817 pentamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は磁気記録媒体の製造方法に係り、特に磁気記
録媒体の液体潤滑層の形成方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic recording medium, and particularly to a method of forming a liquid lubricant layer of a magnetic recording medium.
磁気記録媒体（以下媒体とも称する）を磁気記録装ｆｔ
に搭載して使用する場合、磁気ヘッドが媒体表面で停止
、摺動を繰り返す。従って媒体表面の潤滑特性は媒体の
使用寿命を左右する。媒体の潤滑特性は一般には液体潤
滑層の膜厚を所要の範囲に制御することによって最適な
状態に保つことができる。A magnetic recording medium (hereinafter also referred to as a medium) is a magnetic recording device ft.
When used mounted on a media, the magnetic head repeatedly stops and slides on the surface of the media. Therefore, the lubricating properties of the media surface determine the service life of the media. Generally, the lubricating properties of the medium can be maintained at an optimum level by controlling the thickness of the liquid lubricant layer within a required range.
媒体は例えばアルくニウム合金基板上に無電解めっきで
ニッケル・リン合金層を形成し、その上にスパッタ法で
非磁性金属１例えばクロムからなる非磁性金属下地層１
強磁性金属薄膜２例えばコバルト・ニッケル合金Ｎ膜か
らなる磁性層、炭素保護層を順次形成し、さらにその上
に液体潤滑層を浸漬法によって形成することによって調
製することができる。浸漬法はフロロカーボン系の潤滑
剤を溶媒に溶解した塗布液中に媒体を浸漬し、−定速度
で引き上げること゛により塗布膜より溶媒を蒸発させ媒
体の保護層上に所定厚さの７０口カーボン系液体潤滑層
を形成させるものである。液体潤滑層の膜厚は例えば１
７Ａ±２人に設定される。The medium is, for example, a nickel-phosphorous alloy layer formed on an aluminum alloy substrate by electroless plating, and a non-magnetic metal base layer 1 made of a non-magnetic metal 1, for example, chromium, formed on top of the layer by sputtering.
The ferromagnetic metal thin film 2 can be prepared by sequentially forming a magnetic layer made of a cobalt-nickel alloy N film and a carbon protective layer, and further forming a liquid lubricant layer thereon by a dipping method. In the immersion method, the medium is immersed in a coating liquid containing a fluorocarbon lubricant dissolved in a solvent, and the medium is pulled up at a constant speed to evaporate the solvent from the coating film and deposit a predetermined thickness of 70-hole carbon on the protective layer of the medium. This forms a liquid lubricant layer. The thickness of the liquid lubricant layer is, for example, 1
It is set to 7A±2 people.
しかしながら従来の浸漬法による液体潤滑層の形成方法
においては上述の膜厚を満足させることができない。液
体潤滑剤の膜厚は媒体の引上速度と媒体上に付着した塗
布液からの溶媒の蒸発速度によって決定されるのである
が、溶媒の蒸発速度を支配する因子として環境温度、湿
度、液温か従来考えられた。しかしながら溶媒の蒸発速
度につき種々検討を加えた結果、上記３者の他、溶媒蒸
発時の媒体局面における溶媒蒸気の濃度分布が重要な因
子であることがわかった。However, in the conventional method of forming a liquid lubricant layer using the immersion method, the above-mentioned film thickness cannot be satisfied. The film thickness of a liquid lubricant is determined by the pulling speed of the medium and the evaporation rate of the solvent from the coating liquid deposited on the medium, but the factors that control the evaporation rate of the solvent are environmental temperature, humidity, and liquid temperature. Traditionally considered. However, as a result of various studies on the evaporation rate of the solvent, it was found that in addition to the above three factors, the concentration distribution of the solvent vapor in the medium phase during solvent evaporation is an important factor.
この発明は上述の点に鑑みてなされ、その目的は媒体周
囲における溶媒蒸気の濃度分布につきその最適化を図る
ことにより液体潤滑層の膜厚が所望の膜厚になる磁気記
録媒体の製造方法を提供することにある。This invention has been made in view of the above points, and its purpose is to provide a method for manufacturing a magnetic recording medium in which the thickness of a liquid lubricant layer can be made to a desired thickness by optimizing the concentration distribution of solvent vapor around the medium. It is about providing.
上述の目的はこの発明によれば磁性層の上に保護層、液
体潤滑層を順次形成する磁気記録媒体の製造方法であっ
て、前記液体潤滑層を形成する工程がフロロカーボン系
の液体潤滑剤を溶媒に溶解して塗布液を形成し、前記塗
布液を塗布槽に部分的に満たして塗布槽の開放された上
部に所定厚さの溶媒蒸気層を形成し、塗布槽内の塗布液
に磁気記録媒体を浸漬して塗布槽周囲の空気を所定の方
法で排気しながら、前記媒体を一定速度で引き上げるこ
とにより達成される。According to the present invention, the above-mentioned object is a method for manufacturing a magnetic recording medium in which a protective layer and a liquid lubricant layer are sequentially formed on a magnetic layer, and the step of forming the liquid lubricant layer includes using a fluorocarbon-based liquid lubricant. The coating liquid is dissolved in a solvent to form a coating liquid, the coating liquid is partially filled into a coating tank to form a solvent vapor layer of a predetermined thickness on the open top of the coating tank, and the coating liquid in the coating tank is magnetized. This is accomplished by immersing the recording medium and pulling up the medium at a constant speed while evacuating the air around the coating tank in a predetermined manner.
塗布槽の上部に形成される溶媒蒸気層の中には撚布槽か
らの溶媒の蒸発によって、溶媒蒸気が満たされるが塗布
槽の周囲の空気が排気されるので溶媒蒸気層内に溶媒蒸
気の濃度勾配が発生する。The solvent vapor layer formed at the top of the coating tank is filled with solvent vapor due to the evaporation of the solvent from the twisting tank, but as the air around the coating tank is exhausted, the solvent vapor layer is filled with solvent vapor. A concentration gradient occurs.
媒体に付着した塗布液からはこの濃度勾配に対応して溶
媒の蒸発が行われる。この濃度勾配が安定であるときは
付着塗布液からの溶媒の蒸発速度も安定化し、液体潤滑
層の膜厚の再現性がよくγよる。The solvent is evaporated from the coating liquid adhering to the medium in accordance with this concentration gradient. When this concentration gradient is stable, the evaporation rate of the solvent from the deposited coating liquid is also stabilized, and the reproducibility of the thickness of the liquid lubricant layer is good depending on γ.
次にこの発明の実施例を図面に基いて説明する。 Next, embodiments of the present invention will be described based on the drawings.
第１図はこの発明の実施例に係る塗布槽を示す要部斜視
図である。塗布槽１の内部に塗布液３が上部に厚さ人の
溶媒蒸気層を設けて満たされる。排気孔２より所定速度
で溶媒蒸気が排気される。塗布液３の中に図示しないが
媒体が浸漬され一定速度で引き上げられる。FIG. 1 is a perspective view of essential parts showing a coating tank according to an embodiment of the present invention. The interior of the coating tank 1 is filled with a coating liquid 3 with a thick solvent vapor layer provided above. Solvent vapor is exhausted from the exhaust hole 2 at a predetermined speed. A medium (not shown) is immersed in the coating liquid 3 and pulled up at a constant speed.
第２図は溶媒蒸気層の厚さ人（α）と液体潤滑層の膜厚
の変化幅１大値と最小値の差）との関係を示すＴｆＡ図
である。この特性は開口部３Ｑ ｔｓ Ｘ ４Ｑ ａｍ
の塗布槽に塗布液を部分的に満たし、排気量１Ｍ／ｍ１
ｎのもとで行われた。塗布液は末端にペンセン環を有す
るフロロカーボン系の液体潤滑剤を７０ン１１３の溶媒
に溶解したものである。フロロカーボン系液体潤滑剤の
濃度はｏ、４５Ｍｔ％である。FIG. 2 is a TfA diagram showing the relationship between the thickness (α) of the solvent vapor layer and the variation width (difference between the maximum value and the minimum value) of the film thickness of the liquid lubricant layer. This characteristic is aperture 3Q ts X 4Q am
Partially fill the coating tank with coating liquid, and reduce the displacement to 1M/m1.
It was carried out under n. The coating liquid was prepared by dissolving a fluorocarbon-based liquid lubricant having a pentene ring at the end in 70 N113 of a solvent. The concentration of the fluorocarbon liquid lubricant was 45 Mt%.
液温は２２”Ｃ，気温は幻℃、相対湿度は５０％に保持
された。磁気記録媒体はテープ研磨を行ってから１５０
℃、ｌｈの前加熱を行い、次に塗布液中に加Ｓ浸漬して
から、１．５ｍ／ｓの速度で引き上げられた。引き上げ
後１２０℃で１ｈの後加熱を行った。The liquid temperature was kept at 22"C, the air temperature was 50 degrees Celsius, and the relative humidity was kept at 50%.The magnetic recording medium was kept at 150% after tape polishing.
The sample was preheated at 1 h at ℃, then immersed in the coating liquid under S, and then pulled up at a speed of 1.5 m/s. After lifting, post-heating was performed at 120° C. for 1 hour.
目標とする液体潤滑層の厚さは１７Ａである。潤滑層の
厚さは低エネルギ電子分光器の電子エネルギとＥＳＣＡ
で得られる絶対厚との関係から検量線を作製しておき、
電子エネルギを測定して膜厚を求めた。膜厚より変化幅
を計算することができる。The target thickness of the liquid lubricant layer is 17A. The thickness of the lubricant layer is determined by the electron energy of a low-energy electron spectrometer and ESCA.
Create a calibration curve based on the relationship with the absolute thickness obtained in
The film thickness was determined by measuring the electron energy. The width of change can be calculated from the film thickness.
溶媒蒸気層の厚さが１〜２はの範囲で変化幅が最小にな
っていることがわかる。It can be seen that the width of change is minimum when the thickness of the solvent vapor layer is in the range of 1 to 2.
第３図は排気量と液体潤滑層の膜厚変化幅との関係を示
す線図である。第３図の特性線は溶媒蒸気層の厚さｌｃ
ａの条件で行われた。その他の条件は第２図の場合と同
じである。排気量が１〜２〃鵡のとき液体潤滑層の膜厚
変化幅が最小になっている。このようにして溶媒蒸気層
の厚さと排気量とを最適にすると、液体潤滑層の膜厚の
変化幅が最小になり、液体潤滑層の膜厚が設定値に制御
される。なお媒体周囲の空気の排気は、連続的にあるい
は間けり的にこれを行うことができる。また第１図でオ
ーバフロ一部４は、液体潤滑層を形成しない時に塗布液
をオーバフローして循環させ、ダストの除去、塗布液の
均−化等を行うものである。FIG. 3 is a diagram showing the relationship between the displacement amount and the width of change in the thickness of the liquid lubricant layer. The characteristic line in Figure 3 is the thickness of the solvent vapor layer, lc.
It was conducted under the conditions of a. Other conditions are the same as in the case of FIG. When the displacement is 1 to 2 mm, the width of change in the thickness of the liquid lubricant layer is at its minimum. By optimizing the thickness and exhaust amount of the solvent vapor layer in this way, the width of change in the thickness of the liquid lubricant layer is minimized, and the thickness of the liquid lubricant layer is controlled to the set value. Note that the air around the medium can be exhausted continuously or intermittently. In FIG. 1, the overflow portion 4 is used to overflow and circulate the coating liquid when a liquid lubricant layer is not formed, thereby removing dust, equalizing the coating liquid, and the like.
この発明によれば磁性層の上に保護層、液体潤滑層を順
次形成する磁気記録媒体の製造方法であって、前記液体
潤滑層を形成する工程がフロロカ−ボン系の液体潤滑剤
を溶媒に溶解して塗布液を形成し、前記塗布液を塗布槽
に部分的に満たして塗布槽の開放された上部に所定厚さ
の溶媒蒸気層を形成し、塗布槽内の塗布液に磁気記録媒
体を浸漬して塗布槽周囲の空気を所定の方法で排気しな
がら、前記媒体を一定速度で引き上げるので溶媒蒸気層
内の溶媒蒸気の濃度勾配のパターンを安定化させること
ができ、そのために媒体に付着した塗布液からの溶媒の
蒸発速度が変化することがなくなって、液体潤滑層の膜
厚の再現性が向上し、媒体の潤滑特性が最適化され、信
頼性に優れる磁気記録媒体が得られる。According to the present invention, there is provided a method for manufacturing a magnetic recording medium in which a protective layer and a liquid lubricant layer are sequentially formed on a magnetic layer, wherein the step of forming the liquid lubricant layer uses a fluorocarbon-based liquid lubricant as a solvent. The coating liquid is dissolved to form a coating liquid, the coating liquid is partially filled in a coating tank to form a solvent vapor layer of a predetermined thickness on the open upper part of the coating tank, and a magnetic recording medium is attached to the coating liquid in the coating tank. Since the medium is pulled up at a constant speed while the air around the coating tank is evacuated in a predetermined manner, the pattern of the concentration gradient of the solvent vapor in the solvent vapor layer can be stabilized. The evaporation rate of the solvent from the deposited coating liquid no longer changes, improving the reproducibility of the thickness of the liquid lubricant layer, optimizing the lubrication properties of the medium, and providing a highly reliable magnetic recording medium. .
第１図はこの発明の実施例に係る塗布槽を示す要部斜視
図、第２図はこの発明の実施例に係る溶媒蒸気層の厚さ
と液体潤滑層の膜厚変化幅との関係を示す線図、第３図
はこの発明の実施例に係る排気量と液体潤滑層の膜厚変
化幅との関係を示す線図である。
１：塗布槽、２：排気孔、３：塗布液、４ニオ−バフロ
一部。
２′ｊｆＰ気孔
第
図
第
図
第
図FIG. 1 is a perspective view of a main part showing a coating tank according to an embodiment of the present invention, and FIG. 2 shows the relationship between the thickness of a solvent vapor layer and the width of change in thickness of a liquid lubricant layer according to an embodiment of this invention. FIG. 3 is a diagram showing the relationship between the displacement amount and the width of change in the thickness of the liquid lubricant layer according to the embodiment of the present invention. 1: Coating tank, 2: Exhaust hole, 3: Coating liquid, 4 Part of Niobaflo. 2'jfP stomatal diagram diagram
Claims (1)
気記録媒体の製造方法であって、前記液体潤滑層を形成
する工程がフロロカーボン系の液体潤滑剤を溶媒に溶解
して塗布液を形成し、前記塗布液を塗布槽に部分的に満
たして塗布槽の開放された上部に所定厚さの溶媒蒸気層
を形成し、塗布槽内の塗布液に磁気記録媒体を浸漬して
塗布槽周囲の空気を所定の方法で排気しながら、前記媒
体を一定速度で引き上げることを特徴とする磁気記録媒
体の製造方法。1) A method for manufacturing a magnetic recording medium in which a protective layer and a liquid lubricant layer are sequentially formed on a magnetic layer, the step of forming the liquid lubricant layer being a coating solution in which a fluorocarbon-based liquid lubricant is dissolved in a solvent. A coating tank is partially filled with the coating liquid to form a solvent vapor layer of a predetermined thickness on the open top of the coating tank, and the magnetic recording medium is immersed in the coating liquid in the coating tank for coating. 1. A method for manufacturing a magnetic recording medium, characterized in that the medium is pulled up at a constant speed while air around the tank is evacuated in a predetermined manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21684589A JPH0380430A (en) | 1989-08-23 | 1989-08-23 | Production of magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21684589A JPH0380430A (en) | 1989-08-23 | 1989-08-23 | Production of magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0380430A true JPH0380430A (en) | 1991-04-05 |
Family
ID=16694808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21684589A Pending JPH0380430A (en) | 1989-08-23 | 1989-08-23 | Production of magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0380430A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6194025B1 (en) * | 1999-02-23 | 2001-02-27 | Fuji Electric Co., Ltd. | Method for manufacturing magnetic recording medium |
| JP2009283106A (en) * | 2008-05-26 | 2009-12-03 | Fuji Electric Device Technology Co Ltd | Magnetic disk and method for manufacturing the same |
| US7640886B2 (en) | 2003-09-30 | 2010-01-05 | Hitachi Global Storage Technologies Netherlands B.V. | Disk lubricant tank insert to suppress lubricant surface waves |
-
1989
- 1989-08-23 JP JP21684589A patent/JPH0380430A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6194025B1 (en) * | 1999-02-23 | 2001-02-27 | Fuji Electric Co., Ltd. | Method for manufacturing magnetic recording medium |
| US7640886B2 (en) | 2003-09-30 | 2010-01-05 | Hitachi Global Storage Technologies Netherlands B.V. | Disk lubricant tank insert to suppress lubricant surface waves |
| JP2009283106A (en) * | 2008-05-26 | 2009-12-03 | Fuji Electric Device Technology Co Ltd | Magnetic disk and method for manufacturing the same |
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