JP2000063144A - Glass for information recording medium substrate - Google Patents
Glass for information recording medium substrateInfo
- Publication number
- JP2000063144A JP2000063144A JP10227302A JP22730298A JP2000063144A JP 2000063144 A JP2000063144 A JP 2000063144A JP 10227302 A JP10227302 A JP 10227302A JP 22730298 A JP22730298 A JP 22730298A JP 2000063144 A JP2000063144 A JP 2000063144A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- mol
- substrate
- information recording
- recording medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
-
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、磁気ディスク、光
ディスク、等の情報記録媒体に用いる基板用ガラスに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to glass for substrates used for information recording media such as magnetic disks and optical disks.
【０００２】[0002]
【従来の技術】情報記録用媒体基板、たとえばハードデ
ィスクなどの磁気ディスクの基板材料としては、従来よ
りアルミニウム、ガラス、セラミックス、カーボンなど
が知られている。現在では、サイズや用途に応じて主に
アルミニウムおよびガラスが実用化されている。とりわ
けガラス基板は、表面の平滑性や機械的強度が優れるた
め、その使用範囲が拡大している。情報記録媒体基板と
して用いられるガラス基板として、特開平１−２３９０
３６では、ガラス基板表面をイオン交換で強化した化学
強化ガラス基板が、特開平８−１６９７２４では、実質
的にアルカリを含まない無アルカリガラス基板が、開示
されている。2. Description of the Related Art Aluminum, glass, ceramics, carbon and the like have been conventionally known as substrate materials for information recording medium substrates, for example, magnetic disks such as hard disks. At present, aluminum and glass are mainly put into practical use depending on the size and application. In particular, the glass substrate has a wide range of use because of its excellent surface smoothness and mechanical strength. As a glass substrate used as an information recording medium substrate, Japanese Patent Application Laid-Open No. 1-2390
No. 36 discloses a chemically strengthened glass substrate in which the surface of the glass substrate is strengthened by ion exchange, and Japanese Unexamined Patent Publication No. 8-169724 discloses an alkali-free glass substrate containing substantially no alkali.
【０００３】[0003]
【発明が解決しようとする課題】近年ハードディスクド
ライブについては記憶容量の向上が求められており、ま
たパソコンの小型化に伴いディスク基板の小型化および
薄型化が求められている。現在、直径２．５インチのガ
ラスディスク基板の厚さは０．６３ｍｍ程度であるが、
将来的には０．４３ｍｍ、さらには０．３８ｍｍへと薄
くなることが予想されている。しかしディスク基板は薄
くなればなるほどたわみや反りが生じやすくなる。In recent years, hard disk drives have been required to have improved storage capacity, and with the miniaturization of personal computers, there has been a demand for miniaturization and thinning of disk substrates. Currently, the thickness of a glass disk substrate with a diameter of 2.5 inches is about 0.63 mm,
It is expected to be reduced to 0.43 mm and further to 0.38 mm in the future. However, the thinner the disk substrate, the more likely it is to bend or warp.
【０００４】一方、記録密度の向上を目的として、ディ
スクと読み取り磁気ヘッドとの間隔は狭くなってきてお
り、上記のような基板のたわみや反りは磁気ディスク破
損の原因となる。現在使用されているガラスディスク基
板を薄くしていくと上記のたわみや反りによる問題が顕
在化するため、薄型化が困難である。この問題を解決す
るため、特開平１０−８１５４２においては高い比弾性
率（＝ヤング率÷密度）を有するガラス基板が開示され
ている。このガラスの比弾性率は３６ＧＰａ／ｇ／ｃｍ
3 以上であり、ディスク基板を薄型化した場合でも基板
のたわみや反りの問題が生じにくいものとなっている。On the other hand, the distance between the disk and the reading magnetic head is becoming narrower for the purpose of improving the recording density, and the above-mentioned bending and warping of the substrate causes damage to the magnetic disk. As the glass disk substrate currently used is made thinner, the problems due to the above-mentioned bending and warping become apparent, so that it is difficult to make it thinner. In order to solve this problem, Japanese Patent Laid-Open No. 10-81542 discloses a glass substrate having a high specific elastic modulus (= Young's modulus / density). The specific elastic modulus of this glass is 36 GPa / g / cm
It is 3 or more, and even when the disk substrate is thinned, the problem of substrate bending and warpage is unlikely to occur.
【０００５】これらのガラスの密度は典型的には２．９
ｇ／ｃｍ3 以上、最小でも２．７２ｇ／ｃｍ3 以上であ
る。今後、ノートパソコンやＰＤＡ（Ｐｅｒｓｏｎａｌ
Ｄｉｇｉｔａｌ Ａｓｓｉｓｔａｎｃｅ：携帯情報端
末）等に代表される、モバイル（携帯）用途に用いられ
るハードディスクには軽量性が要求されるため、より軽
い基板材料への要求が高まっているが、密度が２．７２
ｇ／ｃｍ3 以上であるガラスではそのような要求に充分
こたえられないおそれがある。The densities of these glasses are typically 2.9.
It is at least g / cm 3 , and at least 2.72 g / cm 3 . In the future, laptop computers and PDAs (Personal)
A hard disk used for mobile (portable) applications, represented by Digital Assistance (mobile information terminal) and the like, is required to be lightweight, so that a demand for a lighter substrate material is increasing, but the density is 2.72.
A glass having g / cm 3 or more may not be able to sufficiently meet such requirements.
【０００６】本発明は以上の課題を解決し、高い比弾性
率を有し、かつ、密度が小さい情報記録媒体基板用ガラ
スの提供を目的とする。An object of the present invention is to solve the above problems and provide a glass for an information recording medium substrate having a high specific elastic modulus and a low density.
【０００７】[0007]
【課題を解決するための手段】本発明は、モル％表示で
実質的に、
ＳｉＯ2 ３０〜６０、
Ｂ2 Ｏ3 ０．５〜２０、
Ａｌ2 Ｏ3 ４〜４０、
ＭｇＯ ０〜４０、
ＣａＯ ０〜２０、
Ｙ2 Ｏ3 ０〜 ６、
ＴｉＯ2 ０〜２０、
ＺｒＯ2 ０〜１０、
Ｌｉ2 Ｏ ０〜１２、
からなり、密度が２．７１ｇ／ｃｍ3 以下である情報記
録媒体基板用ガラスを提供する。Means for Solving the Problems In the present invention, SiO 2 30-60, B 2 O 3 0.5-20, Al 2 O 3 4-40, MgO 0-40, An information recording medium substrate comprising CaO 0-20, Y 2 O 3 0-6, TiO 2 0-20, ZrO 2 0-10, Li 2 O 0-12, and a density of 2.71 g / cm 3 or less. Glass for use.
【０００８】[0008]
【発明の実施の形態】本発明における組成の限定理由は
以下のとおりである（以下では特記しないかぎりモル％
を単に％と表記する。）。ＳｉＯ2 はネットワークフォ
ーマーであり必須である。６０％超では比弾性率が小さ
くなりすぎるおそれがある。好ましくは５８％以下であ
る。３０％未満ではガラスの安定性が低下するおそれが
ある。好ましくは３２％以上である。Ｂ2 Ｏ3 は密度を
低下させる成分であり必須である。２０％超では比弾性
率が小さくなりすぎるおそれがある。好ましくは１８％
以下である。０．５％未満では前記効果が小さい。好ま
しくは２％以上である。BEST MODE FOR CARRYING OUT THE INVENTION The reasons for limiting the composition of the present invention are as follows (unless otherwise specified, mol% is given below).
Is simply expressed as%. ). SiO 2 is a network former and is essential. If it exceeds 60%, the specific elastic modulus may be too small. It is preferably 58% or less. If it is less than 30%, the stability of the glass may decrease. It is preferably at least 32%. B 2 O 3 is a component that lowers the density and is essential. If it exceeds 20%, the specific elastic modulus may be too small. Preferably 18%
It is the following. If it is less than 0.5%, the above effect is small. It is preferably at least 2%.
【０００９】Ａｌ2 Ｏ3 は比弾性率を向上させる効果が
あり必須成分である。４０％超では溶融ガラスの粘度が
大きくなりすぎ溶解が困難になるおそれがある。好まし
くは３８％以下である。４％未満では前記効果が小さ
い。好ましくは６％以上である。ＭｇＯは必須成分では
ないが、比弾性率を向上させるために４０％までは含有
してもよい。４０％超では溶融ガラスの粘度が大きくな
りすぎ溶解が困難になるおそれ、およびガラスの安定性
が低下するおそれががある。好ましくは３８％以下であ
る。ＣａＯは必須成分ではないが、ガラス溶解時の溶融
ガラスの粘度を低下させ溶解を促進するために２０％ま
で含有させてもよい。２０％超では比弾性率が低下する
おそれがある。好ましくは１８％以下である。Al 2 O 3 has the effect of improving the specific elastic modulus and is an essential component. If it exceeds 40%, the viscosity of the molten glass tends to be too high, and melting may be difficult. It is preferably 38% or less. If it is less than 4%, the above effect is small. It is preferably at least 6%. Although MgO is not an essential component, it may be contained up to 40% in order to improve the specific elastic modulus. If it exceeds 40%, the viscosity of the molten glass tends to be too high and melting may be difficult, and the stability of the glass may be deteriorated. It is preferably 38% or less. CaO is not an essential component, but may be contained up to 20% in order to reduce the viscosity of the molten glass at the time of melting the glass and accelerate the melting. If it exceeds 20%, the specific elastic modulus may decrease. It is preferably 18% or less.
【００１０】Ｙ2 Ｏ3 は必須成分ではないが、比弾性率
を向上させるために６％までは含有してもよい。６％超
ではガラスの密度が大きくなりすぎるおそれがある。好
ましくは５％以下である。ＴｉＯ2 は必須成分ではない
が、比弾性率を向上させるために２０％までは含有して
もよい。２０％超ではガラスの安定性が低下するおそれ
がある。好ましくは１８％以下である。ＺｒＯ2 は必須
成分ではないが、比弾性率を向上させるために１０％ま
では含有してもよい。１０％超ではガラスの密度が大き
くなりすぎるおそれ、および溶融ガラスの粘度が大きく
なりすぎ溶解が困難になるおそれがある。好ましくは８
％以下である。Y 2 O 3 is not an essential component, but may be contained up to 6% in order to improve the specific elastic modulus. If it exceeds 6%, the density of the glass may be too high. It is preferably 5% or less. TiO 2 is not an essential component, but may be contained up to 20% in order to improve the specific elastic modulus. If it exceeds 20%, the stability of the glass may decrease. It is preferably 18% or less. ZrO 2 is not an essential component, but may be contained up to 10% in order to improve the specific elastic modulus. If it exceeds 10%, the density of the glass may be too high, and the viscosity of the molten glass may be too high, and melting may be difficult. Preferably 8
% Or less.
【００１１】Ｌｉ2 Ｏは必須成分ではないが、ガラス溶
解時の溶融ガラスの粘度を低下させ溶解を促進するため
に１２％まで含有させてもよい。１２％超では比弾性率
が低下するおそれがある。好ましくは１０％以下であ
る。Ｂ2 Ｏ3 の含有量は、密度を低下させるために、Ｙ
2 Ｏ3 の含有量よりも大とすることが好ましい。Li 2 O is not an essential component, but may be contained up to 12% in order to lower the viscosity of the molten glass at the time of melting the glass and accelerate the melting. If it exceeds 12%, the specific elastic modulus may decrease. It is preferably 10% or less. The content of B 2 O 3 is Y in order to reduce the density.
It is preferable to make it larger than the content of 2 O 3 .
【００１２】本発明のガラスは上記成分の他に、ＳＯ
3 、Ａｓ2 Ｏ3 、Ｓｂ2 Ｏ3 、等の清澄剤、Ｆｅ2 Ｏ
3 、ＮｉＯ、ＣｏＯ、等の着色剤を合量で２％までの範
囲で適宜含有してもよい。また、ガラスの溶解を促進す
るためにＳｒＯ、ＢａＯ、ＺｎＯ、Ｎａ2 Ｏ、Ｋ2 Ｏ、
等を含有してもよいが、過度の添加は比弾性率を低下さ
せるおそれがあるので、それぞれ１％以下、合量で２％
以下、とすることが好ましい。さらに、ガラス溶解促進
およびガラスの安定化をはかるために、Ｐ2 Ｏ5 、Ｖ2
Ｏ5 、等を添加してもよい。In addition to the above components, the glass of the present invention contains SO
3 , As 2 O 3 , Sb 2 O 3 , etc., fining agents, Fe 2 O
Coloring agents such as 3 , NiO, and CoO may be appropriately contained within a total amount of up to 2%. In order to accelerate the melting of glass, SrO, BaO, ZnO, Na 2 O, K 2 O,
, Etc., but excessive addition may reduce the specific elastic modulus, so 1% or less for each, and 2% in total.
The following is preferable. Further, in order to accelerate glass melting and stabilize glass, P 2 O 5 , V 2
O 5 , etc. may be added.
【００１３】本発明のガラスの密度は２．７１ｇ／ｃｍ
3 以下である。２．７１ｇ／ｃｍ3超では基板が重くな
りすぎる。好ましくは２．７０ｇ／ｃｍ3 以下、より好
ましくは２．６９ｇ／ｃｍ3 以下、特に好ましくは２．
６８ｇ／ｃｍ3 以下である。The density of the glass of the present invention is 2.71 g / cm.
It is 3 or less. If it exceeds 2.71 g / cm 3 , the substrate becomes too heavy. Preferably 2.70 g / cm 3 or less, more preferably 2.69 g / cm 3 or less, particularly preferably 2.
It is 68 g / cm 3 or less.
【００１４】本発明のガラスの比弾性率は３６ＧＰａ／
ｇ／ｃｍ3 以上であることが好ましい。比弾性率はヤン
グ率を密度で除したものであり、基板のたわみや反りに
対する指標である。３６ＧＰａ／ｇ／ｃｍ3 未満では基
板を薄くした場合に基板のたわみや反りの問題が生じる
おそれがある。The specific elastic modulus of the glass of the present invention is 36 GPa /
It is preferably g / cm 3 or more. The specific elastic modulus is the Young's modulus divided by the density, and is an index for the deflection and warpage of the substrate. If it is less than 36 GPa / g / cm 3 , problems such as bending and warping of the substrate may occur when the substrate is thinned.
【００１５】本発明のガラスを製造する方法は特に限定
されず、各種製造方法を採用できる。たとえば、目標組
成となるように通常使用される原料を調合し、これを溶
解炉中で加熱溶融する。バブリングや清澄剤の添加や撹
拌などによってガラスの均質化を行い、周知のプレス
法、ダウンドロー法、フロート法などの方法により所定
の板厚に成形し、徐冷後研削、研磨などの加工を行い、
所定のサイズ、形状の基板とする。The method for producing the glass of the present invention is not particularly limited, and various production methods can be adopted. For example, a commonly used raw material is prepared so as to have a target composition, and this is heated and melted in a melting furnace. Homogenize the glass by bubbling, adding a clarifying agent, stirring, etc., form it into a predetermined plate thickness by the well-known pressing method, down-draw method, float method, etc., and after annealing, perform processing such as grinding and polishing. Done,
The substrate has a predetermined size and shape.
【００１６】[0016]
【実施例】表のＳｉＯ2 からＬｉ2 Ｏまでの欄にモル％
表示で示した組成となるように原料を調合して白金るつ
ぼに入れ、１５５０〜１６５０℃に加熱し３〜５時間溶
融した。次いで溶融ガラスを流し出して板状に成形後、
徐冷を行った。得られたガラスについて、密度（単位：
ｇ／ｃｍ3 ）およびヤング率（単位：ＧＰａ）を測定し
た。ヤング率を密度で除した比弾性率（単位：ＧＰａ／
ｇ／ｃｍ3 ）の値とともに表に示す。[Example] In the column of SiO 2 to Li 2 O in the table, mol%
Raw materials were blended so as to have the composition shown in the drawing, put in a platinum crucible, heated to 1550 to 1650 ° C., and melted for 3 to 5 hours. Then, the molten glass is poured out and molded into a plate shape,
Gradually cooled. The density (unit:
g / cm 3 ) and Young's modulus (unit: GPa) were measured. Specific elastic modulus obtained by dividing Young's modulus by density (unit: GPa /
It is shown in the table together with the value of g / cm 3 ).
【００１７】密度およびヤング率の測定方法を以下に示
す。
密度：約２０ｇのガラスについて、アルキメデス法によ
り測定した。
ヤング率：４ｃｍ×４ｃｍのガラス板の両面が平行にな
るように研磨して、厚さを１０〜２０ｍｍとした試料に
ついて、超音波パルス法により測定した。The methods for measuring the density and Young's modulus are shown below. Density: About 20 g of glass was measured by the Archimedes method. Young's modulus: A glass plate having a size of 4 cm × 4 cm was polished so that both surfaces thereof were parallel to each other, and a sample having a thickness of 10 to 20 mm was measured by an ultrasonic pulse method.
【００１８】例１〜２９は実施例、例３０〜３３は比較
例である。実施例の密度はいずれも２．７１ｇ／ｃｍ3
以下であり、基板の軽量化、ひいてはハードディスクド
ライブの軽量化が達成できる。また比弾性率はいずれも
３６ＧＰａ／ｇ／ｃｍ3 以上であり、基板を薄くしても
基板のたわみや反りの問題が生じにくい。一方、比較例
の密度はいずれも２．７１ｇ／ｃｍ3 を超えており、基
板の軽量化、ひいてはハードディスクドライブの軽量化
は困難である。Examples 1 to 29 are Examples and Examples 30 to 33 are Comparative Examples. The density of each of the examples is 2.71 g / cm 3.
The following is a reduction in the weight of the substrate, and thus that of the hard disk drive. In addition, the specific elastic modulus is 36 GPa / g / cm 3 or more, so that even if the substrate is thinned, the problem of bending or warping of the substrate hardly occurs. On the other hand, the density of each of the comparative examples exceeds 2.71 g / cm 3 , and it is difficult to reduce the weight of the substrate and thus the weight of the hard disk drive.
【００１９】[0019]
【表１】 [Table 1]
【００２０】[0020]
【表２】 [Table 2]
【００２１】[0021]
【表３】 [Table 3]
【００２２】[0022]
【表４】 [Table 4]
【００２３】[0023]
【発明の効果】本発明によれば、基板を軽量化でき、基
板を薄くしてもたわみや反りの問題が生じにくい情報記
録媒体基板用ガラスを提供できる。また、基板の軽量化
によりハードディスクドライブモータの負荷が軽減さ
れ、モータを小型化できる。According to the present invention, it is possible to provide a glass for an information recording medium substrate, which makes it possible to reduce the weight of the substrate and prevent the problems of bending and warping even when the substrate is thin. Further, the load on the hard disk drive motor is reduced due to the lighter board, and the motor can be made smaller.
フロントページの続き Ｆターム(参考） 4G062 AA18 BB01 CC10 DA05 DA06 DB03 DB04 DB05 DC02 DC03 DC04 DD01 DE01 DF01 EA01 EA02 EA03 EA04 EA10 EB01 EC01 ED01 ED02 ED03 ED04 ED05 EE01 EE02 EE03 EE04 EF01 EG01 FA01 FA10 FB01 FB02 FB03 FB04 FC01 FC02 FC03 FD01 FE01 FF01 FG01 FH01 FJ01 FJ02 FJ03 FK01 FL01 GA01 GA10 GB01 GC01 GD01 GE01 HH01 HH03 HH05 HH07 HH09 HH11 HH13 HH15 HH17 HH20 JJ01 JJ03 JJ05 JJ07 JJ10 KK01 KK03 KK05 KK07 KK10 MM27 MM29 NN33 5D006 CB04 CB07 DA03 FA00 5D029 KA24 KB01 KC09 Continued front page F-term (reference) 4G062 AA18 BB01 CC10 DA05 DA06 DB03 DB04 DB05 DC02 DC03 DC04 DD01 DE01 DF01 EA01 EA02 EA03 EA04 EA10 EB01 EC01 ED01 ED02 ED03 ED04 ED05 EE01 EE02 EE03 EE04 EF01 EG01 FA01 FA10 FB01 FB02 FB03 FB04 FC01 FC02 FC03 FD01 FE01 FF01 FG01 FH01 FJ01 FJ02 FJ03 FK01 FL01 GA01 GA10 GB01 GC01 GD01 GE01 HH01 HH03 HH05 HH07 HH09 HH11 HH13 HH15 HH17 HH20 JJ01 JJ03 JJ05 JJ07 JJ10 KK01 KK03 KK05 KK07 KK10 MM27 MM29 NN33 5D006 CB04 CB07 DA03 FA00 5D029 KA24 KB01 KC09
Claims (3)
録媒体基板用ガラス。1. SiO 2 30-60, B 2 O 3 0.5-20, Al 2 O 3 4-40, MgO 0-40, CaO 0-20, Y 2 O. A glass for an information recording medium substrate comprising 30 to 6, TiO 2 0 to 20, ZrO 2 0 to 10 and Li 2 O 0 to 12, and a density of 2.71 g / cm 3 or less.
のＹ2 Ｏ3 含有量より大である請求項１記載の情報記録
媒体基板用ガラス。2. The glass for an information recording medium substrate according to claim 1, wherein the content of B 2 O 3 represented by mol% is larger than the content of Y 2 O 3 represented by mol%.
ある請求項１または２記載の情報記録媒体基板用ガラ
ス。3. The glass for an information recording medium substrate according to claim 1, which has a specific elastic modulus of 36 GPa / g / cm 3 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10227302A JP2000063144A (en) | 1998-08-11 | 1998-08-11 | Glass for information recording medium substrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10227302A JP2000063144A (en) | 1998-08-11 | 1998-08-11 | Glass for information recording medium substrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000063144A true JP2000063144A (en) | 2000-02-29 |
Family
ID=16858694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10227302A Pending JP2000063144A (en) | 1998-08-11 | 1998-08-11 | Glass for information recording medium substrate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000063144A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000159544A (en) * | 1998-09-22 | 2000-06-13 | Nippon Sheet Glass Co Ltd | Glass composition, its production, substrate for information recording medium using the same, information recording medium and information recording apparatus |
| JP2002338295A (en) * | 2001-05-17 | 2002-11-27 | Asahi Glass Co Ltd | Alkali-free glass, composition for electronic circuit board and electronic circuit board |
| DE10141666A1 (en) * | 2001-08-25 | 2003-03-13 | Schott Glas | Alkali aluminosilicate glass used in the pre-stressed substrate glass for storage media comprises oxides of silicon, aluminum, boron, lithium, sodium, potassium, zinc, magnesium, calcium, strontium, barium, titanium and zirconium |
| US8222170B2 (en) | 2001-05-31 | 2012-07-17 | Hoya Corporation | Glass substrate for information recording medium and magnetic information recording medium to which the glass substrate is applied |
| EP2930156A1 (en) | 2014-04-07 | 2015-10-14 | Ivoclar Vivadent AG | Glass ceramic with quartz mixed crystal phase |
| CN110831907A (en) * | 2017-07-04 | 2020-02-21 | Ａｇｃ株式会社 | Glass ball |
| US11136258B2 (en) | 2017-10-31 | 2021-10-05 | Corning Incorporated | Peraluminous lithium aluminosilicates with high liquidus viscosity |
| US11292741B2 (en) | 2018-12-12 | 2022-04-05 | Corning Incorporated | Ion-exchangeable lithium-containing aluminosilicate glasses |
| EP4049981A1 (en) | 2021-02-24 | 2022-08-31 | Ivoclar Vivadent AG | Glass ceramic with quartz mixed crystal phase |
| EP4049982A1 (en) | 2021-02-24 | 2022-08-31 | Ivoclar Vivadent AG | Glass ceramic with quartz mixed crystal phase |
| US11897808B2 (en) | 2020-08-26 | 2024-02-13 | Corning Incorporated | Tunable glass compositions having improved mechanical durability |
-
1998
- 1998-08-11 JP JP10227302A patent/JP2000063144A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000159544A (en) * | 1998-09-22 | 2000-06-13 | Nippon Sheet Glass Co Ltd | Glass composition, its production, substrate for information recording medium using the same, information recording medium and information recording apparatus |
| JP4488555B2 (en) * | 1998-09-22 | 2010-06-23 | Ｈｏｙａ株式会社 | GLASS COMPOSITION, PROCESS FOR PRODUCING THE SAME, AND SUBSTRATE FOR INFORMATION RECORDING MEDIUM USING THE SAME, INFORMATION RECORDING MEDIUM |
| JP2002338295A (en) * | 2001-05-17 | 2002-11-27 | Asahi Glass Co Ltd | Alkali-free glass, composition for electronic circuit board and electronic circuit board |
| US8222170B2 (en) | 2001-05-31 | 2012-07-17 | Hoya Corporation | Glass substrate for information recording medium and magnetic information recording medium to which the glass substrate is applied |
| US8697592B2 (en) | 2001-05-31 | 2014-04-15 | Hoya Corporation | Glass substrate for information recording medium and magnetic information recording medium to which the glass substrate is applied |
| DE10141666A1 (en) * | 2001-08-25 | 2003-03-13 | Schott Glas | Alkali aluminosilicate glass used in the pre-stressed substrate glass for storage media comprises oxides of silicon, aluminum, boron, lithium, sodium, potassium, zinc, magnesium, calcium, strontium, barium, titanium and zirconium |
| US11051918B2 (en) | 2014-04-07 | 2021-07-06 | Ivoclar Vivadent Ag | Glass ceramic having a quartz solid solution phase |
| EP2930156A1 (en) | 2014-04-07 | 2015-10-14 | Ivoclar Vivadent AG | Glass ceramic with quartz mixed crystal phase |
| CN110831907A (en) * | 2017-07-04 | 2020-02-21 | Ａｇｃ株式会社 | Glass ball |
| US11136258B2 (en) | 2017-10-31 | 2021-10-05 | Corning Incorporated | Peraluminous lithium aluminosilicates with high liquidus viscosity |
| US11820706B2 (en) | 2017-10-31 | 2023-11-21 | Corning Incorporated | Peraluminous lithium aluminosilicates with high liquidus viscosity |
| US11292741B2 (en) | 2018-12-12 | 2022-04-05 | Corning Incorporated | Ion-exchangeable lithium-containing aluminosilicate glasses |
| US11897808B2 (en) | 2020-08-26 | 2024-02-13 | Corning Incorporated | Tunable glass compositions having improved mechanical durability |
| EP4049981A1 (en) | 2021-02-24 | 2022-08-31 | Ivoclar Vivadent AG | Glass ceramic with quartz mixed crystal phase |
| EP4049982A1 (en) | 2021-02-24 | 2022-08-31 | Ivoclar Vivadent AG | Glass ceramic with quartz mixed crystal phase |
| WO2022179935A1 (en) | 2021-02-24 | 2022-09-01 | Ivoclar Vivadent Ag | Glass ceramic comprising quartz-mixed crystal phases |
| WO2022179936A1 (en) | 2021-02-24 | 2022-09-01 | Ivoclar Vivadent Ag | Glass ceramic comprising a quartz-mixed crystal phase |
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