JPH0532431A - Glass for chemical reinforcement - Google Patents
Glass for chemical reinforcementInfo
- Publication number
- JPH0532431A JPH0532431A JP3284706A JP28470691A JPH0532431A JP H0532431 A JPH0532431 A JP H0532431A JP 3284706 A JP3284706 A JP 3284706A JP 28470691 A JP28470691 A JP 28470691A JP H0532431 A JPH0532431 A JP H0532431A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- chemically strengthened
- ion
- ions
- information recording
- 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.)
- Granted
Links
Classifications
-
- 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
-
- 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
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
- C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- 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
- G11B7/253—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
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は化学強化用ガラス及び化
学強化ガラス並びにこの化学強化ガラスを使用した時計
カバー及び情報記録用基板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemically strengthened glass, a chemically strengthened glass, a watch cover and an information recording substrate using the chemically strengthened glass.
【0002】[0002]
【従来の技術】従来より、化学強化用ガラスとして、特
開昭62−187140号公報には、重量%で64〜7
0%のSiO2 、14〜20%のAl2 O3 、4〜6%
のLi2 O、7〜10%のNa2 O、0〜4%のMg
O、0〜1.5%のZrO2 を含有するガラスが開示さ
れている。2. Description of the Related Art Conventionally, as a glass for chemical strengthening, JP-A-62-187140 discloses a glass of 64 to 7% by weight.
0% SiO 2 , 14-20% Al 2 O 3 , 4-6%
Li 2 O, 7-10% Na 2 O, 0-4% Mg
Glasses containing O, 0-1.5% ZrO 2 are disclosed.
【0003】また、その分析値(重量%)で、61.4
%のSiO2 、16.8%のAl2 O3 、12.7%の
Na2 O、3.6%のK2 O、3.7%のMgO、0.
2%のCaO、および0.8%のTiO2 を含有する市
販ガラスが知られている。The analysis value (% by weight) is 61.4.
% SiO 2 , 16.8% Al 2 O 3 , 12.7% Na 2 O, 3.6% K 2 O, 3.7% MgO, 0.
Commercial glasses are known which contain 2% CaO and 0.8% TiO 2 .
【0004】さらに米国特許第4,156,755号明
細書には、重量%で59〜63%のSiO2 、10〜1
3%のNa2 O、4〜5.5%のLi2 O、15〜23
%のAl2 O3 、2〜5%のZrO2 を含有し、かつN
a2 O/ZrO2 の重量比が2.2〜5.5であるガラ
スが開示されている。Further, US Pat. No. 4,156,755 discloses that 59 to 63% by weight of SiO 2 , 10 to 1 are used.
3% Na 2 O, 4-5.5% Li 2 O, 15-23
% Al 2 O 3 , 2-5% ZrO 2 and N
A glass having a weight ratio of a 2 O / ZrO 2 of 2.2 to 5.5 is disclosed.
【0005】これらの化学強化用ガラスは、これをイオ
ン交換処理することにより、ガラス中のアルカリ金属イ
オン(例えばLiイオン)がイオン交換処理浴中の、よ
り大きなイオン半径のアルカリ金属イオン(例えばNa
イオンおよびKイオン)とイオン交換されて化学強化ガ
ラスが得られる。By subjecting these chemically strengthening glasses to ion exchange treatment, alkali metal ions (eg, Li ions) in the glass have a larger ionic radius (eg, Na ions) in the ion exchange treatment bath.
Ions and K ions) are exchanged to obtain chemically strengthened glass.
【0006】このようにして得られた化学強化ガラス
は、例えば時計カバーに用いられるが、最近では磁気デ
ィスク基板、光ディスク基板、光磁気ディスク基板など
の情報記録用基板への応用も試みられている。The chemically strengthened glass thus obtained is used for, for example, a watch cover, but recently, it has been attempted to be applied to an information recording substrate such as a magnetic disk substrate, an optical disk substrate or a magneto-optical disk substrate. .
【0007】[0007]
【発明が解決しようとする課題】上記の従来の化学強化
用ガラスをイオン交換処理した場合、イオン交換速度が
遅く、十分な深さのイオン交換層(圧縮応力層とも呼ば
れる)が得られにくく、抗折強度に劣る。またヌープ硬
さも低いため、破壊に対する強度が十分に大きいとはい
えない。When the above conventional glass for chemical strengthening is subjected to an ion exchange treatment, the ion exchange rate is slow and it is difficult to obtain an ion exchange layer (also called a compressive stress layer) having a sufficient depth. Inferior in bending strength. Moreover, since the Knoop hardness is low, the strength against fracture cannot be said to be sufficiently high.
【0008】特に化学強化ガラスを磁気ディスク基板な
どの情報記録用基板に応用する場合、化学強化用ガラス
の研摩、円盤加工などの工程で製造者が防ぐことのでき
ない疵が生じやすい。そしてこのような疵を有する化学
強化用ガラスをイオン交換処理しても、イオン交換によ
りガラス表面に形成された圧縮応用層が浅く、抗折強度
が低いため、得られる化学強化ガラスが衝撃などにより
破壊しやすくなる。したがってこのような破壊を引き起
こさない情報記録用基板を得るためには、イオン交換に
よりガラス表面に形成される圧縮応力層を深くし、抗折
強度を高める必要があるが、上記従来の化学強化用ガラ
スから得られた化学強化ガラスは、圧縮応力層が浅く、
抗折強度が低いために情報記録用基板として用いるには
不十分である。Particularly when the chemically strengthened glass is applied to an information recording substrate such as a magnetic disk substrate, flaws which cannot be prevented by the manufacturer are likely to occur in the steps such as polishing and disk processing of the chemically strengthened glass. Even if the chemically strengthened glass having such a flaw is subjected to an ion exchange treatment, the compression applied layer formed on the glass surface by the ion exchange is shallow and the bending strength is low, so that the resulting chemically strengthened glass may be impacted. It is easy to destroy. Therefore, in order to obtain an information recording substrate that does not cause such destruction, it is necessary to deepen the compressive stress layer formed on the glass surface by ion exchange to increase the bending strength. Chemically strengthened glass obtained from glass has a shallow compressive stress layer,
Since the bending strength is low, it is insufficient for use as a substrate for recording information.
【0009】したがって、本発明の第1の目的は、優れ
たイオン交換性能を有し、イオン交換によって得られた
化学強化ガラスに深い圧縮応力層、およびこれに基づく
高い抗折強度、そして高いヌープ硬さを付与できる化学
強化用ガラスを提供することにある。Therefore, a first object of the present invention is to provide a chemically strengthened glass obtained by ion exchange with a deep compressive stress layer, which has excellent ion exchange performance, and a high bending strength based on this, and a high Knoop. It is to provide a glass for chemical strengthening that can impart hardness.
【0010】また本発明の第2の目的は、前記第1の目
的を達成する化学強化用ガラスを用いて、化学強化ガラ
スを提供することにある。A second object of the present invention is to provide a chemically strengthened glass by using the glass for chemically strengthening which achieves the first object.
【0011】さらに本発明の第3の目的は、前記第2の
目的を達成する化学強化ガラスを用いて、時計カバーを
提供することにある。A third object of the present invention is to provide a timepiece cover using the chemically strengthened glass which achieves the second object.
【0012】さらに本発明の第4の目的は、前記第2の
目的を達成する化学強化ガラスを用いて、情報記録用基
板を提供することにある。A fourth object of the present invention is to provide an information recording substrate by using the chemically strengthened glass which achieves the second object.
【0013】さらに、本発明の第5の目的は、上記第4
の目的を達成する情報記録用基板を用いた情報記録媒体
を提供することにある。Further, a fifth object of the present invention is to provide the above-mentioned fourth object.
An object of the present invention is to provide an information recording medium using an information recording substrate that achieves the above object.
【0014】[0014]
【課題を解決するための手段】前記第1の目的を達成す
る本発明の化学強化用ガラスは、重量%で、62〜75
%のSiO2 、5〜15%のAl2 O3 、4〜10%の
Li2 O、4〜12%のNa2 O、および5.5〜15
%のZrO2 を含有し、かつNa2 O/ZrO2 の重量
比が0.5〜2.0、Al2O3 /ZrO2 の重量比が
0.4〜2.5であることを特徴とする。The glass for chemical strengthening of the present invention which achieves the first object is 62 to 75% by weight.
% SiO 2 , 5-15% Al 2 O 3 , 4-10% Li 2 O, 4-12% Na 2 O, and 5.5-15.
% ZrO 2 , and the weight ratio of Na 2 O / ZrO 2 is 0.5 to 2.0, and the weight ratio of Al 2 O 3 / ZrO 2 is 0.4 to 2.5. And
【0015】また、前記第2の目的を達成する本発明の
化学強化ガラスは、上記の化学強化用ガラスを、Naイ
オンおよび/またはKイオンを含有する処理浴でイオン
交換処理して化学強化したことを特徴とする。The chemically strengthened glass of the present invention which achieves the second object is chemically strengthened by subjecting the above glass for chemical strengthening to an ion exchange treatment in a treatment bath containing Na ions and / or K ions. It is characterized by
【0016】さらに、前記第3の目的を達成する本発明
の時計カバーは、上記の化学強化ガラスを用いたことを
特徴とする。Further, the timepiece cover of the present invention which achieves the third object is characterized by using the above-mentioned chemically strengthened glass.
【0017】さらに、前記第4の目的を達成する本発明
の情報記録用基板は、上記の化学強化ガラスを用いたこ
とを特徴とする。Furthermore, the information recording substrate of the present invention which achieves the fourth object is characterized by using the above chemically strengthened glass.
【0018】さらに、上記第5の目的を達成する本発明
の情報記録媒体は、上記情報記録用基板を用いたことを
特徴とする。Further, an information recording medium of the present invention which achieves the above fifth object is characterized by using the above information recording substrate.
【0019】以下、本発明を詳述する。本発明の化学強
化用ガラスの組成の限定理由は次の通りである。The present invention will be described in detail below. The reasons for limiting the composition of the glass for chemical strengthening of the present invention are as follows.
【0020】SiO2 は、ガラス骨格を形成する主要成
分であり、62%未満であると化学的耐久性が悪化し、
75%を越えると溶融温度が高くなり過ぎる。従ってS
iO2 の割合は、62〜75%に限定される。特に好ま
しくは63〜71%である。Al2 O3 は、ガラス表面
のイオン交換性能を向上させるため含有させるが、5%
未満であるとこの効果が低下するともに化学的耐久性が
悪化し、15%を越えると耐失透性が悪化する。従って
Al2 O3 の割合は、5〜15%に限定される。特に好
ましくは7〜14%である。SiO 2 is the main component forming the glass skeleton, and if it is less than 62%, the chemical durability deteriorates,
If it exceeds 75%, the melting temperature becomes too high. Therefore S
The proportion of iO 2 is limited to 62-75%. It is particularly preferably 63 to 71%. Al 2 O 3 is contained in order to improve the ion exchange performance of the glass surface, but 5%
If it is less than less than this effect, the chemical durability is deteriorated and if it exceeds 15%, the devitrification resistance is deteriorated. Therefore, the proportion of Al 2 O 3 is limited to 5 to 15%. It is particularly preferably 7 to 14%.
【0021】Li2 Oは、ガラス表層部でイオン交換処
理浴中の主としてNaイオンとイオン交換されることに
より、ガラスを化学強化するための必須成分であるが、
4%未満ではこのイオン交換性能が低下し、10%を超
えると耐失透性と化学的耐久性が共に悪化する。従って
Li2 Oの割合は、4〜10%に限定される。特に好ま
しくは4〜7%である。Li 2 O is an essential component for chemically strengthening the glass by being ion-exchanged mainly with Na ions in the ion-exchange treatment bath at the surface layer of the glass,
If it is less than 4%, the ion exchange performance is lowered, and if it exceeds 10%, both devitrification resistance and chemical durability are deteriorated. Therefore, the proportion of Li 2 O is limited to 4 to 10%. It is particularly preferably 4 to 7%.
【0022】Na2 Oは、ガラス表層部でイオン交換処
理浴中のKイオンとイオン交換されることにより、ガラ
スを化学強化するための必須成分であるが、4%未満で
は耐失透性が劣化し、12%を超えると化学的耐久性が
劣化すると共にヌープ硬さが小さくなる。従ってNa2
Oの割合は、4〜12%に限定される。特に好ましくは
6〜11%である。Na 2 O is an essential component for chemically strengthening the glass by being ion-exchanged with K ions in the ion-exchange treatment bath at the surface layer of the glass, but if it is less than 4%, the devitrification resistance is low. When it exceeds 12%, the chemical durability deteriorates and the Knoop hardness decreases. Therefore Na 2
The proportion of O is limited to 4 to 12%. It is particularly preferably 6 to 11%.
【0023】ZrO2 は、ヌープ硬さを大きくする効果
がある上に、化学的耐久性を良化するために5.5%以
上必要であるが、15%を超えると溶融炉の底部に未溶
解物として沈殿する傾向が強くなる。従ってZrO2 の
割合は、5.5〜15%に限定される。特に好ましくは
6〜12%である。ZrO2 が多いとガラスの耐失透性
が通常は低下するものであるが、ZrO2 が5.5〜1
5%と比較的に多量であるにも拘らず、本発明のガラス
は耐失透性に優れていることは特筆すべきことである。ZrO 2 has the effect of increasing the Knoop hardness, and is required to be 5.5% or more in order to improve the chemical durability. However, if it exceeds 15%, it is not formed in the bottom of the melting furnace. The tendency to precipitate as a lysate becomes stronger. Therefore, the proportion of ZrO 2 is limited to 5.5 to 15%. It is particularly preferably 6 to 12%. When the content of ZrO 2 is large, the devitrification resistance of the glass is usually lowered, but the content of ZrO 2 is 5.5 to 1
It is noteworthy that the glass of the present invention is excellent in devitrification resistance despite the relatively large amount of 5%.
【0024】本発明の化学強化用ガラスにおいては、N
a2 O/ZrO2 の重量比およびAl2 O3 /ZrO2
の重量比も所定の範囲に限定される。すなわち、Na2
O/ZrO2 の重量比は、ヌープ硬さを高くし、優れた
強度を得るために2.0以下にする必要があるが、0.
5未満であると耐失透性が悪化するため、0.5〜2.
0に限定される。特に好ましいNa2 O/ZrO2 の重
量比は0.7〜1.8である。In the glass for chemical strengthening of the present invention, N
a 2 O / ZrO 2 weight ratio and Al 2 O 3 / ZrO 2
The weight ratio of is also limited to a predetermined range. That is, Na 2
The weight ratio of O / ZrO 2 needs to be 2.0 or less in order to increase the Knoop hardness and obtain excellent strength.
If it is less than 5, devitrification resistance deteriorates, so 0.5 to 2.
Limited to 0. A particularly preferable weight ratio of Na 2 O / ZrO 2 is 0.7 to 1.8.
【0025】また、Al2 O3 /ZrO2 の重量比は、
優れた耐失透性とイオン交換性能を維持し、安定かつ高
強度のガラスを得るために、0.4〜2.5に限定され
る。特に好ましいAl2 O3 /ZrO2 の重量比は、
0.6〜2.0である。その理由は、0.4未満である
と、ガラスが不安定になり、一方2.5を超えると、圧
縮応力層が薄くなり抗折強度が低下するだけでなく、ヌ
ープ硬さも低下するからである。The weight ratio of Al 2 O 3 / ZrO 2 is
It is limited to 0.4 to 2.5 in order to maintain excellent devitrification resistance and ion exchange performance and obtain a stable and high-strength glass. A particularly preferred weight ratio of Al 2 O 3 / ZrO 2 is
It is 0.6 to 2.0. The reason is that if it is less than 0.4, the glass becomes unstable, while if it exceeds 2.5, not only the compressive stress layer becomes thin and the transverse strength decreases, but also the Knoop hardness decreases. is there.
【0026】本発明の化学強化用ガラスは、以上の成分
の他に、本発明の特性を損わない範囲で、MgO、Zn
O、TiO2 及びLa2 O3 や、清澄剤として通常使用
されるAs2 O3 、Sb2 O3 、F及びCl等を含有す
ることができる。The glass for chemical strengthening of the present invention comprises, in addition to the above components, MgO, Zn within a range not impairing the characteristics of the present invention.
O, may contain or TiO 2 and La 2 O 3, As 2 O 3 usually used as a fining agent, Sb 2 O 3, F and Cl and the like.
【0027】本発明の化学強化用ガラスは、その組成が
上述した範囲に入るように、調合したガラス原料を15
00〜1600℃で5〜8時間加熱溶融し、この溶融ガ
ラスを型に鋳込み成形し徐冷することによって得られ
る。The glass for chemical strengthening of the present invention contains 15 glass raw materials prepared so that the composition thereof falls within the above range.
It is obtained by heating and melting at 00 to 1600 ° C. for 5 to 8 hours, casting the molten glass in a mold, and gradually cooling.
【0028】得られた本発明の化学強化用ガラスは、優
れたイオン交換性能を有し、イオン交換によって得られ
た化学強化ガラスに深い圧縮応力層、およびこれに基づ
く高い抗折強度、そして高いヌープ硬さを付与できる。The obtained glass for chemical strengthening of the present invention has an excellent ion exchange performance, and a deep compressive stress layer based on the chemically strengthened glass obtained by ion exchange and a high bending strength based on the layer are obtained. Can add Knoop hardness.
【0029】次に本発明の化学強化ガラスについて説明
する。この化学強化ガラスは、前記化学強化用ガラス
を、Naイオンおよび/またはKイオンを含有する処理
浴でイオン交換処理して化学強化したものである。Na
イオンおよび/またはKイオンを含有する処理浴として
は、硝酸ナトリウムおよび/または硝酸カリウムを含有
する処理浴を用いるのが好ましいが、硝酸塩に限定され
るものではなく、硫酸塩、重硫酸塩、炭酸塩、重炭酸
塩、ハロゲン化物を用いても良い。処理浴がNaイオン
を含む場合には、このNaイオンがガラス中のLiイオ
ンとイオン交換し、また処理浴がKイオンを含む場合に
は、このKイオンがガラス中のNaイオンとイオン交換
し、さらに処理浴がNaイオンおよびKイオンを含む場
合には、これらNaイオンおよびKイオンが、ガラス中
のLiイオンおよびNaイオンとそれぞれイオン交換す
る。このイオン交換により、ガラス表層部のアルカリ金
属イオンが、より大きなイオン半径のアルカリ金属イオ
ンに置き換わり、ガラス表層部に圧縮応力層が形成され
てガラスが化学強化される。上述のように本発明の化学
強化用ガラスは、優れたイオン交換性能を有するので、
イオン交換によって形成された圧縮応力層は深く、抗折
強度が高いので、本発明の化学強化ガラスは優れた耐破
壊性を有する。Next, the chemically strengthened glass of the present invention will be described. This chemically strengthened glass is obtained by chemically strengthening the glass for chemical strengthening by ion exchange treatment in a treatment bath containing Na ions and / or K ions. Na
As the treatment bath containing ions and / or K ions, it is preferable to use a treatment bath containing sodium nitrate and / or potassium nitrate, but the treatment bath is not limited to nitrate, and sulfate, bisulfate, carbonate , Bicarbonate or halide may be used. When the treatment bath contains Na ions, the Na ions exchange ions with Li ions in the glass, and when the treatment bath contains K ions, the K ions exchange ions with Na ions in the glass. When the treatment bath further contains Na ions and K ions, these Na ions and K ions are ion-exchanged with Li ions and Na ions in the glass, respectively. By this ion exchange, alkali metal ions in the glass surface layer portion are replaced with alkali metal ions having a larger ionic radius, a compressive stress layer is formed in the glass surface layer portion, and the glass is chemically strengthened. As described above, the glass for chemical strengthening of the present invention has excellent ion exchange performance,
Since the compression stress layer formed by ion exchange is deep and has high bending strength, the chemically strengthened glass of the present invention has excellent fracture resistance.
【0030】本発明の時計カバーは、上述の化学強化用
ガラスを時計カバーの形状に加工後、化学強化して得ら
れる化学強化ガラスを用いたものである。The watch cover of the present invention uses the chemically strengthened glass obtained by processing the above-mentioned glass for chemical strengthening into the shape of the watch cover and then chemically strengthening it.
【0031】また本発明の情報記録用基板は、上述の化
学強化用ガラスをディスク状などの情報記録用基板の形
状に加工後、化学強化して得られる化学強化ガラスを用
いたものである。情報記録用基板の種類としては、磁気
ディスク基板、光ディスク基板、光磁気ディスク基板な
どが挙げられる。Further, the information recording substrate of the present invention uses the chemically strengthened glass obtained by processing the above-mentioned chemical strengthening glass into a shape of the information recording substrate such as a disk and then chemically strengthening it. Examples of the information recording substrate include a magnetic disk substrate, an optical disk substrate, and a magneto-optical disk substrate.
【0032】[0032]
(実施例1〜6)これらの実施例は、本発明の化学強化
用ガラスと化学強化ガラスに関するものである。原料と
して通常使用される酸化物、炭酸塩、硝酸塩、水酸化物
等を使用し、溶解徐冷後において表1および表2のガラ
ス組成になるように、各原料を実施例毎に秤量した後、
得られた原料混合物の約1.5kgを1リットルの白金る
つぼに入れて1500〜1600℃で5〜8時間加熱し
てガラス融液とし、撹拌して脱泡及び均質化を行なった
後、直径3〜5mm、長さ60mmのロッドを引き上げ法に
より成形し、化学強化用ガラスを得た。これらのロッド
を、385〜405℃に保ったKNO3 60%とNaN
O3 40%の混塩の処理浴中に4時間浸漬して、ガラス
表層部のLiイオンおよびNaイオンを、前記処理浴中
のNaイオンおよびKイオンとそれぞれイオン交換さ
せ、化学強化した。この様にして実施例1〜6の6種類
の化学強化ガラスを得た。(Examples 1 to 6) These examples relate to the chemically strengthened glass and the chemically strengthened glass of the present invention. After using the oxides, carbonates, nitrates, hydroxides, etc. that are commonly used as raw materials, and weighing each raw material for each example so that the glass compositions shown in Tables 1 and 2 are obtained after melting and slow cooling. ,
Approximately 1.5 kg of the obtained raw material mixture was put into a 1 liter platinum crucible and heated at 1500 to 1600 ° C. for 5 to 8 hours to form a glass melt, which was stirred to perform defoaming and homogenization, and then the diameter. A glass for chemical strengthening was obtained by molding a rod having a length of 3 to 5 mm and a length of 60 mm by a pulling method. These rods were kept at 385-405 ° C. with KNO 3 60% and NaN.
By immersing in a treatment bath of a mixed salt of O 3 40% for 4 hours, Li ion and Na ion in the glass surface layer were ion-exchanged with Na ion and K ion in the treatment bath, respectively, to chemically strengthen them. In this way, 6 types of chemically strengthened glasses of Examples 1 to 6 were obtained.
【0033】その後、得られた各実施例の化学強化用ガ
ラスのヌープ硬さおよび化学強化ガラスの圧縮応力層の
深さ、抗折強度、液相温度、耐酸性および耐水性を測定
した。Then, the Knoop hardness of the glass for chemical strengthening of each of the obtained examples, the depth of the compressive stress layer of the chemically strengthened glass, the bending strength, the liquidus temperature, the acid resistance and the water resistance were measured.
【0034】ヌープ硬さは、日本光学硝子工業会測定規
格JOGIS−09に基づき測定した。なお強化後のガ
ラスでは、圧縮応力層の存在により、ヌープ硬さの測定
が困難であり、又、強化前後でヌープ硬さは比例関係を
有するので、強化前のガラスでヌープ硬さを測定した。
圧縮応力層の深さ及び抗折強度は、前記ロッドから0.
4mmの薄片を切り出し、偏光顕微鏡を使用して測定し
た。液相温度は、傾斜形失透炉を使用して測定した。耐
酸性及び耐水性は、日本光学硝子工業会測定規格JOG
IS−06に基づき測定した。The Knoop hardness was measured according to the Japan Optical Glass Industry Association measurement standard JOGIS-09. In the glass after tempering, it is difficult to measure the Knoop hardness due to the presence of the compressive stress layer, and since the Knoop hardness has a proportional relationship before and after tempering, the Knoop hardness was measured with the glass before tempering. .
The depth and bending strength of the compressive stress layer were 0.
4 mm slices were cut out and measured using a polarization microscope. The liquidus temperature was measured using an inclined devitrification furnace. Acid resistance and water resistance are JOG measurement standard JOG
It measured based on IS-06.
【0035】これらの結果をまとめて表1および表2に
示す。その結果、本実施例1〜6の化学強化用ガラス
は、ヌープ硬さが640〜680と高く、これをイオン
交換処理して得られる化学強化ガラスはさらに高いヌー
プ硬さを有することが判明した。また、本実施例1〜6
の化学強化ガラスは、イオン交換度が高く、圧縮応力層
が200〜260μm と深く、抗折強度が82〜98kg
f/mm2 と高いために、深いクラックに対しても十分に強
いことが判明した。なお、本実施例1〜6の結果から、
Al2 O3 /ZrO2 の重量比が小さい程、圧縮応力層
が深く、イオン交換性能が増す傾向にある。The results are summarized in Tables 1 and 2. As a result, it was found that the glass for chemical strengthening of Examples 1 to 6 had a high Knoop hardness of 640 to 680, and the chemically strengthened glass obtained by subjecting the glass to ion exchange treatment had a higher Knoop hardness. . In addition, the present examples 1 to 6
The chemically strengthened glass has a high degree of ion exchange, the compressive stress layer is as deep as 200-260 μm, and the bending strength is 82-98 kg.
Since it is as high as f / mm 2 , it has been found that it is sufficiently strong against deep cracks. From the results of Examples 1 to 6,
The smaller the weight ratio of Al 2 O 3 / ZrO 2 is, the deeper the compressive stress layer is, and the ion exchange performance tends to increase.
【0036】また、本実施例においては、液相温度が9
00〜1150℃(実施例1,2では失透が認められな
かった)であるので、大量生産するに十分な耐失透性を
有することが判明した。In this embodiment, the liquidus temperature is 9
Since it was from 0 to 1150 ° C (devitrification was not observed in Examples 1 and 2), it was found that the devitrification resistance was sufficient for mass production.
【0037】また、耐酸性及び耐水性は、それぞれ0.
02〜0.07%及び0.01〜0.04%と、好まし
い値を示した。The acid resistance and water resistance are respectively 0.
A preferable value was shown as 02 to 0.07% and 0.01 to 0.04%.
【0038】(比較例1〜3)表2に記載した比較例1
は、特開昭62−187140号公報に記載された実施
例1の化学強化用ガラスであり、比較例2及び3は、前
記従来技術の市販化学強化用ガラスである。これらのガ
ラスについて実施例1〜6と同様にして化学強化ガラス
の製造、物性測定評価を行なった(ただし、比較例3
は、化学強化の際、440℃に保ったKNO3 100%
の塩の処理浴で16時間浸漬して、ガラス表層部のNa
イオンを、前記処理液中のKイオンとイオン交換させ
た)。結果を表2に示す。Comparative Examples 1 to 3 Comparative Example 1 shown in Table 2
Is the glass for chemical strengthening of Example 1 described in JP-A-62-187140, and Comparative Examples 2 and 3 are the commercially available glasses for chemical strengthening of the prior art. With respect to these glasses, production of chemically strengthened glass and measurement and evaluation of physical properties were performed in the same manner as in Examples 1 to 6 (however, Comparative Example 3
Is KNO 3 100% kept at 440 ℃ during chemical strengthening
Soak in the salt treatment bath for 16 hours to remove Na from the glass surface.
Ions were exchanged with K ions in the treatment solution). The results are shown in Table 2.
【0039】その結果、比較例1〜3のガラスは、本実
施例1〜6のガラスに比べ、ヌープ硬さがそれぞれ57
0,480,480と著しく劣るものであり、強度は小
さかった。また、圧縮応力層も、それぞれ140μm 、
45μm、95μm と薄く、イオン交換性能に劣り、ガ
ラス表面に傷つけられた深いクラックに対して弱いこと
が判明した。As a result, the glass of Comparative Examples 1 to 3 had a Knoop hardness of 57 compared with the glasses of Examples 1 to 6, respectively.
It was significantly inferior to 0,480,480 and the strength was small. Also, the compressive stress layer is 140 μm,
It was found to be as thin as 45 μm and 95 μm, inferior in ion exchange performance, and weak against deep cracks scratched on the glass surface.
【0040】[0040]
【表1】 [Table 1]
【0041】[0041]
【表2】 [Table 2]
【0042】(実施例7)前述の実施例1〜6で得られ
た化学強化用ガラスについて、カット及び研磨等を行な
い、時計用カバーとしての所望の形状、例えば、対向主
表面がそれぞれ平面である円盤状形状に成形し、その
後、前記実施例1〜6で述べた方法で化学強化して化学
強化ガラスを用いた時計カバーを得た。このように得ら
れた時計カバーも、前記実施例1〜6の化学強化ガラス
と同様の物性および性質を有していた。(Embodiment 7) The glass for chemical strengthening obtained in the above-mentioned Embodiments 1 to 6 is cut and polished to have a desired shape as a watch cover, for example, opposing main surfaces are flat. It was molded into a disk shape, and then chemically strengthened by the method described in Examples 1 to 6 to obtain a watch cover using the chemically strengthened glass. The watch cover thus obtained also had the same physical properties and properties as the chemically strengthened glass of Examples 1 to 6.
【0043】(実施例8)前述の実施例1〜6で得られ
た化学強化用ガラスについて、磁気ディスク基板の形状
(外径130mmφ、中心部の穴径40mmφ、厚さ1.9
mmの円盤状)に成形し、その後、前述の実施例1〜6で
述べた方法で化学強化して化学強化ガラスからなる磁気
ディスク基板を得た。これらの基板をディスク回転装置
にセットして、35,000rpm で基板を回転させても
破壊しなかった。この基板上に膜を付けたディスクで
も、35,000rpm の回転では破壊しなかった。(Embodiment 8) Regarding the glass for chemical strengthening obtained in the above-mentioned Embodiments 1 to 6, the shape of the magnetic disk substrate (outer diameter 130 mmφ, central hole diameter 40 mmφ, thickness 1.9).
mm disk shape) and then chemically strengthened by the method described in Examples 1 to 6 to obtain a magnetic disk substrate made of chemically strengthened glass. Even if these substrates were set on a disk rotating device and the substrates were rotated at 35,000 rpm, they were not destroyed. Even the disk with the film on this substrate did not break at the rotation of 35,000 rpm.
【0044】(実施例9)本発明の磁気記録媒体を以下
のように製造した。先ず、図1に示すように、外径が1
30mmで、内径(穴径)が40mmで、厚さが1.9mmの
実施例8で得られた磁気ディスク用基板1の表面上に、
マグネトロンスパッタリング法により、Crからなる下
地層2(膜厚2000オングストローム)とCoNiC
r合金からなる強磁性の磁性薄膜3(膜厚:700オン
グストローム)と炭素(C)からなる保護膜4(膜厚:
400オングストローム)を順次積層し、保護膜付基体
5を得た。Example 9 A magnetic recording medium of the present invention was manufactured as follows. First, as shown in FIG. 1, the outer diameter is 1
On the surface of the magnetic disk substrate 1 obtained in Example 8 having a size of 30 mm, an inner diameter (hole diameter) of 40 mm and a thickness of 1.9 mm,
Underlayer 2 made of Cr (film thickness 2000 Å) and CoNiC by magnetron sputtering method
Ferromagnetic thin magnetic film 3 (thickness: 700 Å) made of r alloy and protective film 4 (thickness: made of carbon (C))
400 angstroms) were sequentially laminated to obtain a substrate 5 with a protective film.
【0045】次に、前述の保護膜付基体5の保護膜4上
に潤滑剤(例えばモンテジソン社製AM2001)を滴
下し、スピンコート法により潤滑層を被着し、磁気記録
媒体を得た。得られた磁気記録媒体は、基板の破壊もな
く、Cr下地層の剥離もなく、磁気記録媒体として優れ
たものだった。Then, a lubricant (for example, AM2001 manufactured by Montedison Co., Ltd.) was dropped on the protective film 4 of the above-mentioned substrate 5 with a protective film, and a lubricating layer was applied by spin coating to obtain a magnetic recording medium. The obtained magnetic recording medium was excellent as a magnetic recording medium without breaking the substrate or peeling off the Cr underlayer.
【0046】[0046]
【発明の効果】以上説明したように、本発明の化学強化
用ガラスは、優れたイオン交換性能を有し、イオン交換
によって得られた化学強化ガラスに深い圧縮応力層、お
よびこれに基づく高い抗折強度、そして高いヌープ硬さ
を付与できる。従ってこの化学強化用ガラスから、高強
度の化学強化ガラス、さらには時計カバー、情報記録媒
体、情報記録用基板が得られる。INDUSTRIAL APPLICABILITY As described above, the glass for chemical strengthening of the present invention has excellent ion exchange performance, and the chemically strengthened glass obtained by ion exchange has a deep compressive stress layer and a high resistance based on it. Folding strength and high Knoop hardness can be imparted. Therefore, from this glass for chemical strengthening, high-strength chemically strengthened glass, a timepiece cover, an information recording medium, and an information recording substrate can be obtained.
【図1】実施例9で得られた磁気記録媒体の部分拡大模
式図。FIG. 1 is a partially enlarged schematic view of a magnetic recording medium obtained in Example 9.
1…磁気ディスク用基板、2…下地層、3…磁性薄膜、
4…保護膜、5…保護膜付基体1 ... Substrate for magnetic disk, 2 ... Underlayer, 3 ... Magnetic thin film,
4 ... Protective film, 5 ... Substrate with protective film
Claims (5)
〜15%のAl2 O3 、4〜10%のLi2 O、4〜1
2%のNa2 O、および5.5〜15%のZrO2 を含
有し、かつNa2 O/ZrO2 の重量比が0.5〜2.
0であり、さらにAl2 O3 /ZrO2 の重量比が0.
4〜2.5であることを特徴とする化学強化用ガラス。1. 62 to 75% by weight of SiO 2 , 5
15% of Al 2 O 3, 4~10% of Li 2 O, 4 to 1
It contains 2% Na 2 O and 5.5 to 15% ZrO 2 and has a Na 2 O / ZrO 2 weight ratio of 0.5 to 2.
Further, the weight ratio of Al 2 O 3 / ZrO 2 is 0.
Glass for chemical strengthening, which is 4 to 2.5.
aイオンおよび/またはKイオンを含有する処理浴でイ
オン交換処理して化学強化したことを特徴とする化学強
化ガラス。2. The glass for chemical strengthening according to claim 1,
A chemically strengthened glass that is chemically strengthened by ion exchange treatment in a treatment bath containing a ions and / or K ions.
ことを特徴とする時計カバー。3. A timepiece cover using the chemically strengthened glass according to claim 2.
ことを特徴とする情報記録用基板。4. An information recording substrate comprising the chemically strengthened glass according to claim 2.
ことを特徴とする情報記録媒体。5. An information recording medium comprising the information recording substrate according to claim 4.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3284706A JP2837005B2 (en) | 1991-05-20 | 1991-10-30 | Glass for chemical strengthening |
DE19924206268 DE4206268C2 (en) | 1991-05-20 | 1992-02-28 | Chemically reinforced glass composition and its uses |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11460691 | 1991-05-20 | ||
JP3-114606 | 1991-05-20 | ||
JP3284706A JP2837005B2 (en) | 1991-05-20 | 1991-10-30 | Glass for chemical strengthening |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8129435A Division JP2837134B2 (en) | 1991-05-20 | 1996-05-24 | Information recording substrate and information recording medium |
JP12943996A Division JP3169056B2 (en) | 1991-05-20 | 1996-05-24 | Method of manufacturing glass substrate for information recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0532431A true JPH0532431A (en) | 1993-02-09 |
JP2837005B2 JP2837005B2 (en) | 1998-12-14 |
Family
ID=26453333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3284706A Expired - Fee Related JP2837005B2 (en) | 1991-05-20 | 1991-10-30 | Glass for chemical strengthening |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP2837005B2 (en) |
DE (1) | DE4206268C2 (en) |
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Also Published As
Publication number | Publication date |
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JP2837005B2 (en) | 1998-12-14 |
DE4206268C2 (en) | 2001-05-17 |
DE4206268A1 (en) | 1992-11-26 |
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