WO2012014726A1 - リンス剤及びハードディスク基板の製造方法 - Google Patents
リンス剤及びハードディスク基板の製造方法 Download PDFInfo
- Publication number
- WO2012014726A1 WO2012014726A1 PCT/JP2011/066366 JP2011066366W WO2012014726A1 WO 2012014726 A1 WO2012014726 A1 WO 2012014726A1 JP 2011066366 W JP2011066366 W JP 2011066366W WO 2012014726 A1 WO2012014726 A1 WO 2012014726A1
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- WO
- WIPO (PCT)
- Prior art keywords
- abrasive grains
- colloidal silica
- hard disk
- polishing
- rinsing
- Prior art date
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- 239000000758 substrate Substances 0.000 title claims abstract description 70
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 230000000630 rising effect Effects 0.000 title 1
- 239000006061 abrasive grain Substances 0.000 claims abstract description 58
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000008119 colloidal silica Substances 0.000 claims abstract description 43
- 239000002245 particle Substances 0.000 claims abstract description 25
- 238000005498 polishing Methods 0.000 claims description 50
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 14
- 230000007547 defect Effects 0.000 abstract description 16
- 239000012487 rinsing solution Substances 0.000 abstract 1
- 229910018104 Ni-P Inorganic materials 0.000 description 10
- 229910018536 Ni—P Inorganic materials 0.000 description 10
- 238000007518 final polishing process Methods 0.000 description 9
- 238000007517 polishing process Methods 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 150000007524 organic acids Chemical class 0.000 description 3
- 229920000620 organic polymer Polymers 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 241000519995 Stachys sylvatica Species 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000003599 detergent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 150000007522 mineralic acids Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910021642 ultra pure water Inorganic materials 0.000 description 2
- 239000012498 ultrapure water Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004441 surface measurement Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/0008—Detergent materials or soaps characterised by their shape or physical properties aqueous liquid non soap compositions
- C11D17/0013—Liquid compositions with insoluble particles in suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/12—Water-insoluble compounds
- C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/12—Water-insoluble compounds
- C11D3/14—Fillers; Abrasives ; Abrasive compositions; Suspending or absorbing agents not provided for in one single group of C11D3/12; Specific features concerning abrasives, e.g. granulometry or mixtures
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/20—Water-insoluble oxides
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/8404—Processes or apparatus specially adapted for manufacturing record carriers manufacturing base layers
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/20—Industrial or commercial equipment, e.g. reactors, tubes or engines
Definitions
- the present invention relates to a rinsing agent for a hard disk substrate and a method of manufacturing a hard disk substrate using the rinsing agent.
- Hard disks incorporated in magnetic disk storage devices such as computers are becoming smaller and higher capacity year by year, and hard disk substrates are required to have extremely high quality. Therefore, conventionally, polishing for smoothing the substrate surface of the hard disk substrate has been performed. For example, a rough polishing process using alumina abrasive grains and a final polishing process using colloidal silica abrasive grains are employed.
- Patent Document 1 a method is known in which a rinsing step is provided between the rough polishing step and the final polishing step, and the hard disk substrate is rinsed (rinsed) with a rinsing liquid using colloidal silica abrasive grains to reduce residual alumina on the substrate surface.
- the present invention has been made in view of the above points, and an object of the present invention is to provide a rinsing agent for manufacturing a hard disk substrate in which no abrasive grains remain on the substrate surface and no dent defect exists, and the rinsing An object of the present invention is to provide a method of manufacturing a hard disk substrate using an agent.
- the rinsing agent of the present invention that solves the above problems is a rinsing agent containing colloidal silica abrasive grains, where C is the concentration of colloidal silica abrasive grains and R is the average particle diameter of colloidal silica abrasive grains (C , R are represented by% by weight and nm, respectively, and the relationship between the concentration C of colloidal silica abrasive grains and the average particle diameter R satisfies the following formula (1).
- the concentration C of the colloidal silica abrasive grains is preferably 0.8 to 8.0% by weight, and the average particle diameter R of the colloidal silica abrasive grains is 20 to 80 nm. Is preferred.
- the method of manufacturing a hard disk substrate of the present invention includes a rinsing step of rinsing the hard disk substrate using a rinsing agent in which the relationship between the concentration C of colloidal silica abrasive grains and the average particle diameter R satisfies the above formula (1). It is said.
- This rinsing process includes a rough polishing process for rough polishing a hard disk substrate using a polishing liquid containing alumina abrasive grains, and a final polishing process for finish polishing the hard disk substrate using a polishing liquid containing colloidal silica abrasive grains. It is preferable to be performed in between.
- the substrate surface of the hard disk substrate is rinsed (rinsed) with the rinsing agent.
- the amount of alumina abrasive grains present on the surface can be reduced, and the occurrence of a dent defect having a depth of several tens of nanometers in the rinsing process can be suppressed.
- the method of manufacturing a hard disk substrate using the rinse agent of the present invention includes a step of polishing an aluminum blank material to form a substrate, a step of applying Ni—P plating to the substrate to form a Ni—P layer on the substrate surface, alumina A rough polishing process for rough polishing a substrate surface using a polishing liquid containing abrasive grains, a rinsing process for rinsing a rough polished substrate, and a final polishing process for final polishing using a polishing liquid containing colloidal silica abrasive grains Have.
- Ni-P plating process The substrate is sequentially subjected to a series of processes of etching, zincate treatment, Ni—P plating, pure water cleaning, drying, and baking.
- the Ni—P plated substrate surface of the heat-treated substrate is roughly polished. Rough polishing is performed while supplying a polishing liquid containing alumina abrasive grains using a surface plate to which an organic polymer polishing cloth is attached.
- the polishing liquid used in this step preferably contains a hydrogen peroxide solution, an organic acid, an inorganic acid, and a surfactant as a general etchant component that is not particularly limited.
- the average particle diameter of the alumina abrasive grains is preferably 1 ⁇ m or less, more preferably 0.7 ⁇ m or less, from the viewpoint of reducing alumina residue or waviness.
- the concentration of the alumina abrasive grains is preferably 10% by weight or less, more preferably 7% by weight or less from the viewpoints of improving the polishing rate and economy.
- the rinsing agent of the present invention used in the rinsing step is a rinsing liquid containing colloidal silica as abrasive grains, and when the concentration of colloidal silica abrasive grains is C and the average particle diameter of colloidal silica abrasive grains is R ( C and R are represented by weight% and nm, respectively, and the relationship between the concentration C of colloidal silica abrasive grains and the average particle diameter R satisfies the following formula (1).
- the concentration C of the colloidal silica abrasive grains is preferably in the range of 0.8 to 8.0% by weight, and the average particle diameter R of the colloidal silica abrasive grains is in the range of 20 to 80 nm. Preferably there is.
- a detergent may be used in combination or ultrasonic DiP may be used in combination.
- the average particle diameter can be determined by observing with a scanning electron microscope or a transmission electron microscope, performing image analysis, and measuring the particle diameter.
- the final polishing is performed using a surface plate with an organic polymer-based polishing cloth and supplying a polishing liquid containing colloidal silica abrasive grains.
- the polishing liquid used in this step preferably contains a hydrogen peroxide solution, an organic acid, an inorganic acid, and a surfactant as a general etchant component that is not particularly limited.
- the average particle size of the colloidal silica abrasive is preferably 5 to 100 nm, and is preferably 30 nm or less, and more preferably 20 nm or less, from the viewpoint of surface roughness, undulation reduction, and economy. Further, the concentration of the colloidal silica abrasive is preferably 20% by weight or less, more preferably 2 to 10% by weight from the viewpoints of improving the polishing rate, reducing scratches, reducing waviness and economy.
- general scrub cleaning using ion-exchanged water or ultrapure water can be used.
- a detergent may be used in combination or ultrasonic DiP may be used in combination.
- the rinse agent in which the relationship between the concentration C of the colloidal silica abrasive grains and the average particle diameter R is out of the range of the above formula (1) aggregates the colloidal silica abrasive grains in the rinse agent. It is considered that a dent defect having a depth of several tens of nanometers is generated on the substrate surface due to the particles.
- the rinse agent of the present invention is suitable for rinsing a hard disk substrate having a Ni—P layer.
- the hard disk substrate having the Ni—P layer is not particularly limited and is not particularly limited.
- As the substrate material for the Ni—P layer an aluminum alloy substrate, a glass substrate, or a carbon substrate can be used. In general, a substrate made of an aluminum alloy is suitable.
- the average particle size R was measured using a transmission electron microscope (manufactured by JEOL Ltd., transmission electron microscope, JEM2000FX (200 kV)) with a field of view at a magnification of 100,000 times, and this photograph was taken as analysis software (manufactured by Mountec, Mac-View Ver.4.0) was used for analysis and measurement.
- a rough polishing process, a rinsing process with a rinse agent shown in Table 1, a final polishing process, and a cleaning process are performed on a substrate surface of a Ni-P plated aluminum alloy having a diameter of 95 mm, an inner diameter of 25 mm, and a thickness of 1.27 mm.
- the processing was carried out in this order to obtain a Ni—P plated aluminum alloy substrate used as a hard disk substrate.
- Polishing test machine System Seiko Co., Ltd. 9B double-side polishing machine
- Polishing pad FILWEL P1 polishing pad slurry supply amount: 12ml / min / pc Polishing time: Rough polishing 150-300sec Processing pressure: 100g / cm 2 Number of substrates inserted: 10 Number of platen rotations: 12 to 14 rpm
- Rough polishing polishing composition Alumina abrasive grain size 0.6 ⁇ m, concentration 3.9% by weight, and contains hydrogen peroxide, organic acid, sulfuric acid, and surfactant as additives.
- Polishing testing machine System Seiko Co., Ltd. 9B double-side polishing machine
- Polishing pad FILWEL P2 polishing pad slurry supply amount: 12ml / min / pc Polishing time: 150-300sec
- Processing pressure 100g / cm 2
- Number of substrates loaded 10
- Surface plate rotation speed 13-20rpm ⁇ Cleaning after the final polishing process> Scrub washing with ion-exchanged water was performed and centrifugal drying was performed.
- the dent defect on the substrate surface has a condition for generating and a condition for not generating depending on the relationship between the average particle diameter R and the concentration C of the colloidal silica abrasive grains. It can also be seen that the residual amount of alumina abrasive grains (pieces / ⁇ m 2 ) can be reduced by rinsing with a rinse agent containing colloidal silica abrasive grains after the rough polishing step. From these facts, by setting the composition of the rinse agent so that the relationship between the particle size R and the concentration C of the colloidal silica abrasive grains contained in the rinse agent satisfies the above formula (1), the residual alumina can be reduced. It has become possible to suppress dent defects.
- FIG. 1 is a graph showing the results of Table 1 above.
- the dent defect on the substrate surface occurs in a region below the straight line connecting the two points of the value of Example 1 (Actual 1) and the value of Example 6 (Actual 6) (Comparative Examples 1 to 5).
- the region S1 is represented by the above formula (1).
- the minimum value (actual 1) and the maximum value (actual 6 and 7) of the concentration C of the colloidal silica abrasive grains in Examples 1 to 7 and the minimum of the average particle diameter R of the colloidal silica abrasive grains in Examples 1 to 7 The region S2 shown in FIG. 1 is defined by the value (real 1) and the maximum value (real 5). In the region S2, the concentration C of the colloidal silica abrasive grains is in the range of 0.8 to 8.0% by weight, and the average particle diameter R of the colloidal silica abrasive grains is in the range of 20 to 80 nm.
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- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Detergent Compositions (AREA)
Abstract
Description
本発明のリンス剤は、コロイダルシリカ砥粒の濃度Cが、0.8~8.0重量%であることが好ましく、また、コロイダルシリカ砥粒の平均粒径Rが、20~80nmであることが好ましい。
本発明のリンス剤を用いたハードディスク基板の製造方法は、アルミブランク材を研磨して基板を形成する工程、基板にNi-Pめっきを施して基板表面にNi-P層を形成する工程、アルミナ砥粒を含有する研磨液を用いて基板表面を粗研磨する粗研磨工程、粗研磨された基板をリンスするリンス工程、コロイダルシリカ砥粒を含有する研磨液を用いて仕上げ研磨する仕上げ研磨工程を有する。
アルミニウム合金製のブランク材の内外径端面を旋盤加工し、グラインダー工程により表面を研磨する。
基板に対して、エッチング、ジンケート処理、Ni-Pめっき、純水洗浄、乾燥、ベーキングの一連の処理を順次行う。
加熱処理された基板のNi-Pめっきされた基板表面を粗研磨する。粗研磨は、有機高分子系の研磨布を貼付した定盤を用いて、アルミナ砥粒を含有する研磨液を供給しながら行う。本工程において使用される研磨液は、特に限定されない一般的なエッチャント成分として過酸化水素水、有機酸、無機酸、界面活性剤を含有するものが好ましい。
リンスでは、有機高分子系の研磨布を貼付した定盤を用いて、リンス液を供給しながらハードディスク基板の基板表面のアルミナ砥粒を低減する。
上記式(1)において、コロイダルシリカ砥粒の濃度Cは、0.8~8.0重量%の範囲にあることが好ましく、コロイダルシリカ砥粒の平均粒径Rは、20~80nmの範囲にあることが好ましい。
仕上げ研磨は、有機高分子系の研磨布を貼付した定盤を用い、コロイダルシリカ砥粒を含有する研磨液を供給しながら行う。
仕上げ研磨工程後の洗浄は、イオン交換水または超純水を使用した一般的なスクラブ洗浄を用いることができる。また、アルミナ残留やコロイダルシリカ残留低減の観点から、洗剤を併用したり、超音波DiPを併用しても良い。
本発明のリンス剤を用いて、ハードディスク基板のリンスを行うことにより、ハードディスク基板の基板表面に残留するアルミナ砥粒の量を低減することができ、リンス工程において深さが数十nm単位の凹み欠陥が基板表面に発生するのを抑制するという効果を得ることができる。
本発明のリンス剤は、Ni-P層を有するハードディスク基板のリンスに好適である。Ni-P層を有するハードディスク基板としては、公知のもので特に限定されることはなく、Ni-P層の基板材料としては、アルミニウム合金基板、ガラス基板、カーボン基板を使用することができるが、一般的にはアルミニウム合金製の基板が好適である。
研磨試験機: システム精工株式会社 9B両面研磨機
研磨パッド: 株式会社 FILWEL製 P1用研磨パッド
スラリー供給量: 12ml/min/pc
研磨時間: 粗研磨 150~300sec
加工圧力: 100g/cm2
基板投入枚数: 10枚
定盤回転数: 12rpm~14rpm
粗研磨用研磨液組成物: アルミナ砥粒粒径0.6μm、濃度3.9重量%、添加剤として過酸化水素水、有機酸、硫酸、界面活性剤を含む。
研磨試験機: システム精工株式会社 9B両面研磨機
研磨パッド: 株式会社 FILWEL製 P1用研磨パッド
リンス時間: 60sec
基板投入枚数: 10枚
定盤回転数: 12rpm~14rpm
リンス剤: コロイダルシリカ砥粒の粒径R及び濃度Cを表1に示す範囲で調整し、さらに過酸化水素水、硫酸、界面活性剤を添加した。
研磨試験機: システム精工株式会社 9B両面研磨機
研磨パッド: 株式会社 FILWEL製 P2用研磨パッド
スラリー供給量: 12ml/min/pc
研磨時間: 150~300sec
加工圧: 100g/cm2
基板投入枚数: 10枚
定盤回転数 : 13~20rpm
<仕上げ研磨工程後の洗浄>
イオン交換水によるスクラブ洗浄を行い、遠心乾燥を行った。
乾燥後の基板表面を光学系表面測定装置OPTIFLATにて観察し、深さが数十nm単位の凹み欠陥の有無を確認した。
×・・・凹み欠陥有り
[アルミナ砥粒の残留状態の評価]
リンス工程後の基板をイオン交換水によるスクラブ洗浄を行い、遠心乾燥した。その後、基板表面の白点を日立製作所製S-4800 SEMを使用して50,000倍にて観察し、白点をカウントすることにより、基板表面におけるアルミナ砥粒の残留状態を評価した。
Claims (5)
- コロイダルシリカ砥粒を含有するリンス剤であって、
前記コロイダルシリカ砥粒の濃度をC、該コロイダルシリカ砥粒の平均粒径をRとしたときに(C、Rはそれぞれ重量%、nmで表される)、前記コロイダルシリカ砥粒の平均粒径Rと濃度Cの関係が下記の式(1)を満足することを特徴とするリンス剤。
R≧2.2C+18.2・・・・・(1) - 前記コロイダルシリカ砥粒の濃度Cが、0.8~8.0重量%であることを特徴とする請求項1に記載のリンス剤。
- 前記コロイダルシリカ砥粒の平均粒径Rが、20~80nmであることを特徴とする請求項1又は2に記載のリンス剤。
- 前記請求項1から請求項3のいずれか一項に記載のリンス剤を用いてハードディスク基板をリンスするリンス工程を有することを特徴とするハードディスク基板の製造方法。
- 前記リンス工程は、アルミナ砥粒を含有する研磨液を用いてハードディスク基板を粗研磨する粗研磨工程と、コロイダルシリカ砥粒を含有する研磨液を用いてハードディスク基板を仕上げ研磨する仕上げ研磨工程との間に行われることを特徴とする請求項4に記載のハードディスク基板の製造方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SG2013005152A SG187170A1 (en) | 2010-07-26 | 2011-07-19 | Rising agent, and method for production of hard disk substrate |
US13/812,271 US9187718B2 (en) | 2010-07-26 | 2011-07-19 | Rinsing agent, and method for production of hard disk substrate |
CN2011800400738A CN103080292A (zh) | 2010-07-26 | 2011-07-19 | 冲洗剂及用于生产硬盘基材的方法 |
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JP2010166840A JP5795843B2 (ja) | 2010-07-26 | 2010-07-26 | ハードディスク基板の製造方法 |
JP2010-166840 | 2010-07-26 |
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US (1) | US9187718B2 (ja) |
JP (1) | JP5795843B2 (ja) |
CN (1) | CN103080292A (ja) |
MY (1) | MY159056A (ja) |
SG (1) | SG187170A1 (ja) |
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2010
- 2010-07-26 JP JP2010166840A patent/JP5795843B2/ja active Active
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2011
- 2011-07-19 MY MYPI2013000252A patent/MY159056A/en unknown
- 2011-07-19 WO PCT/JP2011/066366 patent/WO2012014726A1/ja active Application Filing
- 2011-07-19 US US13/812,271 patent/US9187718B2/en not_active Expired - Fee Related
- 2011-07-19 CN CN2011800400738A patent/CN103080292A/zh active Pending
- 2011-07-19 SG SG2013005152A patent/SG187170A1/en unknown
- 2011-07-25 TW TW100126180A patent/TWI597338B/zh active
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JP2003178430A (ja) * | 2001-12-07 | 2003-06-27 | Toyo Kohan Co Ltd | 磁気ディスク基板研磨液 |
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MY159056A (en) | 2016-12-15 |
TW201224088A (en) | 2012-06-16 |
JP2012024888A (ja) | 2012-02-09 |
US20130122786A1 (en) | 2013-05-16 |
SG187170A1 (en) | 2013-02-28 |
US9187718B2 (en) | 2015-11-17 |
CN103080292A (zh) | 2013-05-01 |
TWI597338B (zh) | 2017-09-01 |
JP5795843B2 (ja) | 2015-10-14 |
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