JPWO2005043512A1 - 情報記録媒体用ガラス基板及びこれを用いた情報記録媒体 - Google Patents
情報記録媒体用ガラス基板及びこれを用いた情報記録媒体 Download PDFInfo
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- 238000003426 chemical strengthening reaction Methods 0.000 claims description 20
- 238000010828 elution Methods 0.000 claims description 20
- 239000003513 alkali Substances 0.000 claims description 15
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 14
- 238000005728 strengthening Methods 0.000 claims description 13
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 11
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 229910052700 potassium Inorganic materials 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 229910052788 barium Inorganic materials 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 229910052747 lanthanoid Inorganic materials 0.000 claims description 4
- -1 lanthanoid metal oxides Chemical class 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 229910052712 strontium Inorganic materials 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 abstract description 31
- 238000005498 polishing Methods 0.000 abstract description 29
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- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
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- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
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- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910002546 FeCo Inorganic materials 0.000 description 1
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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- 239000011259 mixed solution Substances 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
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- 235000010344 sodium nitrate Nutrition 0.000 description 1
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- 239000010936 titanium Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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- 229910052720 vanadium Inorganic materials 0.000 description 1
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- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
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- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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- G11B7/2531—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising glass
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- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C19/00—Surface treatment of glass, not in the form of fibres or filaments, by mechanical means
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
- C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
- C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
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- G—PHYSICS
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- 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
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
- G11B5/739—Magnetic recording media substrates
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- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B7/2433—Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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- G—PHYSICS
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- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/21—Circular sheet or circular blank
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31—Surface property or characteristic of web, sheet or block
- Y10T428/315—Surface modified glass [e.g., tempered, strengthened, etc.]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Magnetic Record Carriers (AREA)
- Glass Compositions (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
Description
てガラス基板表面に圧縮応力を発生させることをいう。
1.5<Al2O3/B2O3 又は B2O3=0%
を満足するようにするのが好ましい。なお、以下「%」は特に断りのない限り「重量%」を意味するものとする。
(式中、Kc:破壊靭性値(Pa・m1/2)、E:弾性率(Pa)、Hv:ビッカース硬度(Pa)、P:押し込み荷重(N)、C:クラック長さの平均の半分(m)、a:圧痕の対角線長さの平均の半分(m))
また、Si溶出量S及びアルカリ溶出量Aは、強化処理後のガラス基板の記録面を研磨処理して作製した2.5インチディスク基板を、80℃の逆浸透膜水50ml中に24h浸漬した後、ICP発光分光分析装置でその溶出液を分析し算出した値である。したがってアルカリ溶出量はLi,Na,K溶出量の総量である。比弾性率(E/ρ)はヤング率Eを比重ρで割った値であって、ヤング率はJIS R 1602ファインセラミックスの弾性試験方法の動的弾性率試験方法に準じて測定し、比重ρはアルキメデス法により25℃の蒸留水中で測定したものである。またビッカース硬度Hvは、ビッカース硬度試験機を用い荷重100g、負荷時間15secの条件下にて測定した値である。
工程上の破損を低下させることができ製品の歩留まりを向上させることができる。また、耐久性の向上が図れ、記録媒体の信頼性を高くできる。
2 磁性膜
D 磁気ディスク
11 上面(記録面)
12 下面(記録面)
13 強化層
明する。
1.5<Al2O3/B2O3 又は B2O3=0%
を満足する。これらのガラス成分についてその限定した理由について説明する。
あるからである。また、破壊靭性値Kcが0.80未満であると、基板の機械加工において基板が損傷を受けやすくなり、加工歩留まりが大きく低下する。破壊靭性値Kcのより好ましい範囲は0.85以上である。
もよい。なお、上記保護層上に、あるいは上記保護層に替えて、他の保護層を形成してもよい。例えば、上記保護層に替えて、Cr層の上にテトラアルコキシランをアルコール系の溶媒で希釈した中に、コロイダルシリカ微粒子を分散して塗布し、さらに焼成して酸化ケイ素(SiO2)層を形成してもよい。
定められた量の原料粉末を白金るつぼに秤量して入れ、混合したのち、電気炉中で1,550℃で溶解した。原料が充分に溶解したのち、撹拌羽をガラス融液に挿入し、約1時間撹拌した。その後、撹拌羽を取り出し、30分間静置したのち、治具に融液を流しこむことによってガラスブロックを得た。その後各ガラスのガラス転移点付近までガラスブロックを再加熱し、徐冷して歪取りを行った。得られたガラスブロックを厚さ0.635mmの円盤形状にスライスし、内周(内径20mm),外周(外径65mm)を同心円としてカッターを用いて切り出した。
研磨処理後のガラス基板の外周面、内周面、記録面を偏光顕微鏡によって観察し、強化層の厚みを測定した。
図4に示す装置を用いてガラス基板の円環曲げ強度試験を行った。具体的には、ガラス基板にスチールボールを介して荷重を加え、ガラス基板が破壊した時の荷重を測定し破壊荷重とした。この円環曲げ強度試験を、化学強化をした場合としていない場合についてそれぞれ行い、その強度(破壊荷重)Fの比(F強化処理/F未処理)を算出した。
ディスク形状測定器「WYKO400G」WYKO社製を用いてガラス基板の平坦度を測定した。
溶出量が709ppbと高かった。比較例3のガラス基板では、アルカリ金属酸化物の総量が4.0%と少なかったため化学強化処理において強化層が形成されず、ビッカース硬度が655と硬くなり加工性が低下しており、また破壊靭性が0.78と低い強度であった。またSi溶出量Sが563ppbと高かった。比較例4のガラス基板は、実施例5のガラス基板と同じガラス組成であって、研磨処理による研磨量を上下両面で20μm(片面10μm)として、記録面に強化層を5μm残存させたものである。このようなガラス基板では研磨後の平坦度が15μmと高かく、情報記録媒体用として不適であった。
Claims (4)
- 化学強化された情報記録媒体用ガラス基板であって、化学強化による強化層が、外周面および内周面に存在し、情報記録層が形成される面に実質的に存在しないことを特徴とする情報記録媒体用ガラス基板。
- 前記情報記録層が形成される面におけるガラス成分が重量%で、
SiO2:40〜75%、
Al2O3:3〜20%、
B2O3:0〜8%(ただし、ゼロを含む)、
R2O(R=Li,Na,K)の総量:5〜15%、
SiO2+Al2O3+B2O3:60〜90%、
R’O(R’=Mg,Ca,Sr,Ba,Zn)の総量:0〜20%(ただし、ゼロを含む)、
TiO2+ZrO2+LnxOy:0〜15%(ただしゼロを含む、またLnxOyはランタノイド金属酸化物及びY2O3,Nb2O5,Ta2O5からなる群より選ばれた少なくとも1つの化合物を意味する)
であって、
1.5<Al2O3/B2O3 又は B2O3=0%
を満足する請求項1記載の情報記録媒体用ガラス基板。 - 比弾性率(E/ρ)が30以上、ビッカース硬度Hvが450〜650、アルカリ溶出量Aが2.5インチディスク当たり350ppb以下、Si溶出量Sが2.5インチディスク当たり500ppb以下、破壊靭性値Kcが0.80(MPa/m1/2)以上である請求項1又は2記載の情報記録媒体用ガラス基板。
- 請求項1〜3のいずれかに記載のガラス基板に情報記録層を形成したことを特徴とする情報記録媒体。
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