JP3657453B2 - Information processing recording medium - Google Patents
Information processing recording medium Download PDFInfo
- Publication number
- JP3657453B2 JP3657453B2 JP02759999A JP2759999A JP3657453B2 JP 3657453 B2 JP3657453 B2 JP 3657453B2 JP 02759999 A JP02759999 A JP 02759999A JP 2759999 A JP2759999 A JP 2759999A JP 3657453 B2 JP3657453 B2 JP 3657453B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- ion exchange
- recording medium
- information processing
- zro
- 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.)
- Expired - Lifetime
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
- 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
-
- 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
-
- 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
- G11B5/62—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
- G11B5/73911—Inorganic substrates
- G11B5/73921—Glass or ceramic substrates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Magnetic Record Carriers (AREA)
- Surface Treatment Of Glass (AREA)
- Glass Compositions (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、ガラスの薄板を化学強化処理した後の耐水性の優れた情報処理記録媒体に関する。
【０００２】
【従来の技術】
一般に化学強化用ガラスは、組成中に含まれるアルカリ金属よりイオン半径の大きな１価のイオンを含有する溶融塩中に浸漬され、ガラス中のアルカリ金属イオンと溶融塩中の１価のイオンとが交換され化学強化される。
【０００３】
このような化学強化ガラスの用途の一つとして、情報処理記録媒体用の基板、特に磁気ディスク基板として用いられるようになってきた。このような用途には、長期保存及び悪環境すなわち高温高湿下での使用に耐える耐候性が要求される。さらに、使用される形状の薄板化が進み、１ｍｍ以下、さらには０．５ｍｍ以下で使用され始めている。
【０００４】
現在、化学強化用ガラスとしては、ソーダライム組成のフロートガラスが一般に用いられている。しかしながら、前記ガラスは化学強化処理をすると耐候性が著しく悪くなるため、高温多湿の環境での使用に際しては必ずしも十分な耐候性を有しているとは言えなかった。
【０００５】
耐候性の優れた化学強化用ガラスとしては、米国特許４，１５６，７５５号公報にリチウム含有イオン交換強化ガラスが開示されている。すなわち前記公報の７頁２〜１５行には重量％で、５９〜６３％のＳｉＯ2、１０〜１３％のＮａ2Ｏ、４〜５．５％のＬｉ2Ｏ、１５〜２３％のＡｌ2Ｏ3、２〜５％のＺｒＯ2を含有し、Ａｌ2Ｏ3＋ＺｒＯ2が１９〜２５％、Ｎａ2Ｏ／ＺｒＯ2が２．２〜５．５であるガラス組成が開示されている。
【０００６】
また、強化ガラスの製造方法が特開昭６２−１８７１４０号公報に開示されている。すなわち、前記公報の第１項左欄５〜１６行目に、重量％で６４〜７０％のＳｉＯ2、１４〜２０％のＡｌ2Ｏ3、４〜６％のＬｉ2Ｏ、７〜１０％のＮａ2Ｏ、０〜４％のＭｇＯ、０〜１．５％のＺｒＯ2を含有する強化ガラスの製造方法が開示されている。
【０００７】
【発明が解決しようとする課題】
上記米国特許４，１５６，７５５号公報及び特開昭６２−１８７１４０号公報の実施例で示された組成は溶解に高温を要し、素地ガラスが均質なガラスを製造するのは容易ではない。
【０００８】
さらに、上記公報に記載された化学強化用ガラスは、イオン交換後の表面圧縮応力が小さく、表面圧縮応力層を深くすることで強度を上げる必要があった。しかしながら、前記化学強化用ガラスの薄板をイオン交換する場合は、表面応力層を板厚の半分以上にすると、中央部で応力が緩和するため、強度が低下するという問題点があった。
【０００９】
他の化学強化用ガラスが特開平５−３２４３１号公報に開示されている。すなわち前記公報の第２項、左側２〜７行目に重量％で、６２〜７５％のＳｉＯ2、４〜１２％のＮａ2Ｏ、４〜１０％のＬｉ2Ｏ、５〜１５％のＡｌ2Ｏ3、５．５〜１５％のＺｒＯ2を含有し、かつＮａ2Ｏ／ＺｒＯ2の重量比が０．５〜２．０であり、さらにＡｌ2Ｏ3／ＺｒＯ2の重量比が０．４〜２．５である化学強化用ガラスが記載されている。
【００１０】
前記公報に開示された組成のガラスには多量のＺｒＯ2が含まれており、溶融炉を用いて製造する場合、炉内でＺｒＯ2の結晶が析出し易く、均質なガラスを結晶を析出させることなく溶融成形するのが容易でないという問題があり、この問題はガラスの品質に影響を及ぼす重大な問題点となっていた。
【００１１】
【課題を解決するための手段】
本発明は、上記の問題点を解決するためになされたものであって、高品質なガラスの製造が可能であり、化学強化処理後の耐水性が良好で、かつ表面応力値が高く、薄板でも十分な強度を有する化学強化用ガラスを用いた情報処理記録媒体を提供することを目的とする。
【００１２】
本発明は重量％で、
ＳｉＯ2 ５８〜７０
Ａｌ2Ｏ3 １３〜２２
Ｌｉ2Ｏ ６〜１０
Ｎａ2Ｏ ５〜１２
ＺｒＯ2 ２〜５
の組成を有するガラスの薄板表面を化学強化したことを特徴とする情報処理記録媒体である。重量％で、
ＳｉＯ2 ６０〜６８
Ａｌ2Ｏ3 １５．５〜２０
Ｌｉ2Ｏ ６．５〜１０
Ｎａ2Ｏ ５〜９．５
ＺｒＯ2 ２〜５
の組成を有するようにすることはより好ましい。
【００１３】
以下に、本発明の化学強化ガラスを用いる情報処理記録媒体の組成の限定理由について説明する。ＳｉＯ2はガラスを形成するための主要成分であり、５８％未満であるとイオン交換後の耐水性が悪化し、７０％を越えるとガラス融液の粘性が高くなりすぎ、溶融、成形が困難となる。このため、ＳｉＯ2の範囲としては５８〜７０％であり、６０〜６８％が好ましい。Ａｌ2Ｏ3はイオン交換速度を速めるため及びイオン交換後の耐水性を向上するために必要な成分であり、１３％未満ではその効果が不十分であり、２２％を越えるとガラス融液の粘性が高くなりすぎ、溶融、成形が困難となる。このため、Ａｌ2Ｏ3の範囲としては１３〜２２％であり、１５．５〜２０％が好ましい。Ｌｉ2Ｏはイオン交換に必要な成分であるとともに、溶解性を高める成分であり、６％未満ではイオン交換後の表面圧縮応力が十分得られず、また溶解性も悪い。１０％を越えるとイオン交換後の耐水性が悪化するとともに、液相温度が上がり、成形が困難となる。このため、Ｌｉ2Ｏの範囲としては、６〜１０％であり、６．５〜１０％が好ましい。Ｎａ2Ｏは溶解性を高める成分であり、５％未満ではその効果が不十分であり、１２％を越えるとイオン交換後の耐水性が悪化する。このためＮａ2Ｏの範囲としては５〜１２％であり、５〜９．５％以下が好ましい。ＺｒＯ2はイオン交換速度を速め、耐水性にも寄与する成分であり、２％未満ではその効果が不十分であり、５％を越えるとガラス融液の粘性が高くなりすぎ、溶融、成形が困難となる。このため、ＺｒＯ2の範囲としては２〜５％が好ましい。
【００１４】
本発明の化学強化ガラスを用いた情報処理記録媒体には、以上の成分の他に本発明の特性を損なわない範囲で、Ｆｅ2Ｏ3，ＴｉＯ2，ＮｉＯ，Ｃｒ2Ｏ3，ＣｏＯ等の着色剤、Ａｓ2Ｏ3，Ｓｂ2Ｏ3等の清澄剤を３％以下含有することが出来る。
【００１５】
【発明の実施の形態】
本発明における５種の実施例の組成及びガラスの特性を表１に、また４種の比較例の組成及びガラスの特性を表２に示す。
まず、実施例１について説明する。表１に示した組成となるように通常のガラス原料であるシリカ、アルミナ、炭酸リチウム、炭酸ナトリウム、ジルコンを用いて調合した。調合したバッチは白金るつぼを用いて１４５０℃で４時間溶融し、鉄板上に流し出した。このガラスを５００℃の炉で３０ｍｉｎ保持した後、炉の電源を切り、室温まで放冷し、試料ガラスとした。
【００１６】
試料ガラスの特性として、溶融温度（ｌｏｇη＝２の温度）、作業温度（ＴW：ｌｏｇη＝４の温度）、液相温度（ＴL）、作業温度と液相温度との差（ＴW−ＴL）及び歪点（ｌｏｇη＝１４．５の温度）の測定結果を表１に示す。
【００１７】
高温域の粘性は白金球引き上げ式自動粘度測定装置にて、また歪点はビーム曲げ式粘度測定装置により測定した。
【００１８】
液相温度は次のようにして測定した。試料ガラスを粉砕し、１６８０μｍのフルイを通過し、１１９０μｍのフルイ上にとどまったガラス粒をエタノールに浸漬し、超音波洗浄した後、恒温槽で乾燥させた。
白金ボート上に１列に開けた１ｍｍ径の多数の穴にこのガラス粒を一粒づつ並べ、８５０〜１１５０℃の勾配炉内に４時間保持した後、炉から取り出し、ガラス粒上に発生した失透を観察し、発生した最高温度をもって液相温度とした。
【００１９】
イオン交換後の特性として、表面応力、表面応力層深さ、耐水性の測定結果を表１に示す。
イオン交換は、試薬１級の硝酸ナトリウム４０％と試薬１級の硝酸カリウム６０％の混合溶融塩中にガラスを浸漬し、３８０℃で３時間保持して行った。
表面応力、表面応力層深さはイオン交換処理したガラスの薄片を作製し、偏光顕微鏡を用いて測定した。
耐水性は、上記試料ガラスを５０×１００×板厚２ｍｍに切り出し、鏡面研磨した板をイオン交換し、この板を２０ｍｌの精製水と共にビニール袋に入れ、６０℃で１２０時間保持した後、精製水中に溶出したガラス成分量を測定し、単位面積当たりの溶出量として求めた。
【００２０】
実施例２〜５も実施例１と同様の方法で試料ガラスを作製し、実施例１と同様にしてガラスの特性及びイオン交換後の特性を測定した。
いずれの実施例においても溶融温度は１５３０℃以下、液相温度は作業温度より低く、溶解性及び成形性に優れている。また、応力値は４６ｋｇ／ｍｍ2以上であった。イオン交換後の耐水性テストにおける重量減は１．４μｇ／ｃｍ2以下と優れている。
【００２１】
【表１】
比較例
実施例１と同様の方法で試料ガラスを作製し、ガラスの特性及びイオン交換後の特性を測定した。
【００２３】
比較例１に用いたガラス組成は、米国特許４，１５６，７５５号公報の実施例１８に記載された組成であり、溶融点は１６１５℃と高く、高品質のガラスを製造するのが容易ではない。また、応力値も３３ｋｇ／ｍｍ2と本実施例に比べて小さいことが分かる。
【００２４】
比較例２は特開昭６２−１８７１４０号公報の実施例１に記載された組成であり、溶融点は１５９０℃以上と高く、高品質のガラスを製造するのが容易ではない。また、応力値も３６ｋｇ／ｍｍ2以下と本実施例に比べて小さいことが分かる。
【００２５】
比較例３は特開平５−３２４３１号公報の実施例４に記載された組成であり、作業温度に比べ液相温度が高く、ガラスの成形が困難である。
【００２６】
比較例４は前記市販のソーダライムガラスであり、実施例１と同様の方法で試料ガラスを作製し、ガラスの特性及びイオン交換後の特性を測定した。ただし、イオン交換は試薬１級の硝酸ナトリウムの溶融塩中にガラスを浸漬し４７０℃で３時間保持して行った。イオン交換後の耐水性テストにおける重量減は２０μｇ／ｃｍ2であり、本発明の実施例の１０倍以上の溶出があり、耐水性が悪い。
【００２７】
【表２】
【発明の効果】
本発明によれば、ガラスの薄板表面を化学強化処理した後の耐水性が良好で、かつ表面応力値が高く、薄板でも十分な強度を有することが要求される情報処理記録媒体を、溶解性及び成形性の良いガラス素地から得ることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water resistance superior information processing recording medium after the thin plate chemical strengthening treatment of the glass.
[0002]
[Prior art]
In general, the glass for chemical strengthening is immersed in a molten salt containing monovalent ions having a larger ion radius than the alkali metal contained in the composition, and the alkali metal ions in the glass and the monovalent ions in the molten salt are separated. Exchanged and chemically strengthened.
[0003]
One such chemically reinforced glass applications, substrates for information processing Symbol recording medium has been especially adapted to be used as a magnetic disk substrate. Such an application requires weather resistance that can withstand long-term storage and use under adverse environments, that is, high temperature and high humidity. Furthermore, the shape of the used shape has been reduced, and it has started to be used at 1 mm or less, further 0.5 mm or less.
[0004]
Currently, float glass having a soda lime composition is generally used as the glass for chemical strengthening. However, since the weather resistance of the glass is remarkably deteriorated when chemically strengthened, it cannot be said that the glass has sufficient weather resistance when used in a high temperature and high humidity environment.
[0005]
As a glass for chemical strengthening having excellent weather resistance, a lithium-containing ion exchange strengthened glass is disclosed in US Pat. No. 4,156,755. That is, on page 7, lines 2 to 15 of the publication, 59 to 63% SiO 2 , 10 to 13% Na 2 O, 4 to 5.5% Li 2 O, 15 to 23% Al by weight%. A glass composition containing 2 O 3 , 2-5% ZrO 2 , Al 2 O 3 + ZrO 2 19-25%, Na 2 O / ZrO 2 2.2-5.5 is disclosed. .
[0006]
Further, a method for producing tempered glass is disclosed in Japanese Patent Laid-Open No. 62-187140. That is, in the first column, the left column, lines 5 to 16 of the publication, 64-70% by weight of SiO 2 , 14-20% Al 2 O 3 , 4-6% Li 2 O, 7-10. % of Na 2 O, 0 to 4% of MgO, a manufacturing method of the tempered glass containing 0 to 1.5% of ZrO 2 is disclosed.
[0007]
[Problems to be solved by the invention]
The compositions shown in the examples of the above-mentioned US Pat. No. 4,156,755 and JP-A-62-187140 require a high temperature for melting, and it is not easy to produce a glass with a homogeneous base glass.
[0008]
Furthermore, the glass for chemical strengthening described in the above publication has a small surface compressive stress after ion exchange, and it is necessary to increase the strength by deepening the surface compressive stress layer. However, when ion exchange is performed on the thin plate of the glass for chemical strengthening, if the surface stress layer is made half or more of the plate thickness, the stress is relieved at the central portion, so that the strength is lowered.
[0009]
Another glass for chemical strengthening is disclosed in JP-A-5-32431. That second term of the publication, in weight percent on the 2-7 line left, 62-75% of SiO 2, 4 to 12% of Na 2 O, 4 to 10% of Li 2 O, 5-15% Al 2 O 3 , 5.5 to 15% of 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 A glass for chemical strengthening in which is 0.4 to 2.5 is described.
[0010]
The glass of the composition disclosed in the above publication contains a large amount of ZrO 2 , and when manufactured using a melting furnace, crystals of ZrO 2 are easily precipitated in the furnace, and crystals of homogeneous glass are precipitated. Therefore, it has been a problem that it is not easy to perform melt molding, and this problem has been a serious problem affecting the quality of glass.
[0011]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-described problems, and is capable of producing high-quality glass, has good water resistance after chemical strengthening treatment, and has a high surface stress value. However, it aims at providing the information processing recording medium using the glass for chemical strengthening which has sufficient intensity | strength.
[0012]
The present invention is weight percent,
SiO 2 58-70
Al 2 O 3 13-22
Li 2 O 6-10
Na 2 O 5-12
ZrO 2 2-5
The thin glass plate surface that have a composition of an information processing recording medium you characterized and this chemically strengthened. % By weight
SiO 2 60~68
Al 2 O 3 15.5-20
Li 2 O 6.5-10
Na 2 O 5 to 9.5
ZrO 2 2-5
It is more preferable to have the following composition.
[0013]
The following describes reasons for limiting the composition of an information processing recording medium using a chemical strengthening glass of the present invention. SiO 2 is a main component for forming glass. If it is less than 58%, the water resistance after ion exchange deteriorates, and if it exceeds 70%, the viscosity of the glass melt becomes too high, making melting and molding difficult. It becomes. Therefore, as the range of SiO 2 is 58-70%, preferably 60-68%. Al 2 O 3 is a component necessary for accelerating the ion exchange rate and improving the water resistance after ion exchange. If it is less than 13%, its effect is insufficient. Viscosity becomes too high, making melting and molding difficult. Therefore, a 13 to 22% as a range of Al 2 O 3, preferably 15.5 to 20%. Li 2 O is a component necessary for ion exchange and a component for improving solubility. If it is less than 6%, sufficient surface compressive stress after ion exchange cannot be obtained, and the solubility is poor. If it exceeds 10%, the water resistance after ion exchange deteriorates, the liquidus temperature rises, and molding becomes difficult. For this reason, the range of Li 2 O is 6 to 10%. 5 to 10% is preferable. Na 2 O is a component that enhances the solubility. If it is less than 5%, its effect is insufficient. If it exceeds 12%, the water resistance after ion exchange deteriorates. Therefore it 5 to 12 percent as a range of Na 2 O, preferably less 5 to 9.5%. ZrO 2 is a component that increases the ion exchange rate and contributes to water resistance. If it is less than 2%, its effect is insufficient, and if it exceeds 5%, the viscosity of the glass melt becomes too high, and melting and molding are difficult. It becomes difficult. For this reason, the range of ZrO 2 is preferably 2 to 5%.
[0014]
The information processing recording medium using a chemically strengthened glass of the present invention, within a range not to impair the characteristics of the present invention in addition to the above components, Fe 2 O 3, TiO 2 , NiO, Cr 2 O 3, CoO etc. 3% or less of clarifiers such as As 2 O 3 and Sb 2 O 3 can be contained.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Table 1 shows the composition and glass characteristics of five examples in the present invention, and Table 2 shows the composition and glass characteristics of four comparative examples.
First, Example 1 will be described. The composition shown in Table 1 was prepared using silica, alumina, lithium carbonate, sodium carbonate, and zircon, which are ordinary glass raw materials. The prepared batch was melted at 1450 ° C. for 4 hours using a platinum crucible and poured out on an iron plate. After holding this glass in a 500 ° C. furnace for 30 minutes, the furnace was turned off and allowed to cool to room temperature to obtain a sample glass.
[0016]
As characteristics of the sample glass, melting temperature (temperature of log η = 2), working temperature (TW: temperature of log η = 4), liquid phase temperature (TL), difference between working temperature and liquid phase temperature (TW−TL) and Table 1 shows the measurement results of the strain point (temperature of log η = 14.5).
[0017]
The viscosity in the high temperature range was measured with a platinum ball pulling type automatic viscosity measuring device, and the strain point was measured with a beam bending type viscosity measuring device.
[0018]
The liquidus temperature was measured as follows. The sample glass was pulverized, passed through a 1680 μm sieve, and remained on the 1190 μm sieve. The glass particles were immersed in ethanol, subjected to ultrasonic cleaning, and then dried in a thermostatic bath.
These glass particles were arranged one by one in a number of 1 mm diameter holes opened in a row on a platinum boat, held in a gradient furnace at 850 to 1150 ° C. for 4 hours, then removed from the furnace and generated on the glass particles. Devitrification was observed, and the highest temperature generated was defined as the liquidus temperature.
[0019]
Table 1 shows the measurement results of surface stress, surface stress layer depth, and water resistance as characteristics after ion exchange.
The ion exchange was carried out by immersing the glass in a mixed molten salt of 40% of reagent grade 1 sodium nitrate and 60% of reagent grade 1 potassium nitrate and holding at 380 ° C. for 3 hours.
The surface stress and the depth of the surface stress layer were measured using a polarizing microscope after producing a glass flake after ion exchange treatment.
For water resistance, the sample glass was cut to 50 × 100 × 2 mm thickness, the mirror-polished plate was ion-exchanged, and this plate was placed in a plastic bag with 20 ml of purified water and kept at 60 ° C. for 120 hours. The amount of glass component eluted in water was measured and determined as the amount of elution per unit area.
[0020]
In Examples 2 to 5, sample glasses were prepared in the same manner as in Example 1, and the characteristics of the glass and the properties after ion exchange were measured in the same manner as in Example 1.
In any of the examples, the melting temperature is 1530 ° C. or lower, the liquidus temperature is lower than the working temperature, and the solubility and moldability are excellent. The stress value was 46 kg / mm 2 or more. The weight loss in the water resistance test after ion exchange is excellent at 1.4 μg / cm 2 or less.
[0021]
[Table 1]
Comparative Example A sample glass was prepared in the same manner as in Example 1, and the characteristics of the glass and the characteristics after ion exchange were measured.
[0023]
The glass composition used in Comparative Example 1 is the composition described in Example 18 of US Pat. No. 4,156,755, the melting point is as high as 1615 ° C., and it is not easy to produce high-quality glass. Absent. It can also be seen that the stress value is 33 kg / mm 2 , which is small compared to the present example.
[0024]
Comparative Example 2 has the composition described in Example 1 of JP-A No. 62-187140. The melting point is as high as 1590 ° C. or higher, and it is not easy to produce high-quality glass. It can also be seen that the stress value is 36 kg / mm 2 or less, which is smaller than that of the present example.
[0025]
Comparative Example 3 has the composition described in Example 4 of JP-A-5-32431, and the liquidus temperature is higher than the working temperature, making it difficult to form glass.
[0026]
Comparative Example 4 is the commercially available soda lime glass. A sample glass was prepared in the same manner as in Example 1, and the characteristics of the glass and the characteristics after ion exchange were measured. However, ion exchange was performed by immersing glass in a molten salt of first grade sodium nitrate and holding at 470 ° C. for 3 hours. The weight loss in the water resistance test after ion exchange is 20 μg / cm 2 , and elution is 10 times or more that of the example of the present invention, and the water resistance is poor.
[0027]
[Table 2]
【The invention's effect】
According to the present invention, good water resistance after chemical strengthening the thin surface of the glass, and the surface stress value is high, the information processing recording medium in which Ru is required to have sufficient strength even in thin, soluble And it can obtain from a glass substrate with good moldability.
Claims (1)
ＳｉＯ2 ５８〜７０
Ａｌ2Ｏ3 １３〜２２
Ｌｉ2Ｏ ６〜１０
Ｎａ2Ｏ ５〜１２
ＺｒＯ2 ２〜５
の組成を有するガラスの薄板表面を化学強化したことを特徴とする情報処理記録媒体。 % By weight
SiO 2 58-70
Al 2 O 3 13-22
Li 2 O 6-10
Na 2 O 5-12
ZrO 2 2-5
Information recording medium thin plate surface of the glass that have a composition of you characterized and this chemically strengthened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02759999A JP3657453B2 (en) | 1999-02-04 | 1999-02-04 | Information processing recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02759999A JP3657453B2 (en) | 1999-02-04 | 1999-02-04 | Information processing recording medium |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6184856A Division JP2977068B2 (en) | 1994-08-05 | 1994-08-05 | Glass for chemical strengthening |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11314931A JPH11314931A (en) | 1999-11-16 |
| JP3657453B2 true JP3657453B2 (en) | 2005-06-08 |
Family
ID=12225404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02759999A Expired - Lifetime JP3657453B2 (en) | 1999-02-04 | 1999-02-04 | Information processing recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3657453B2 (en) |
Families Citing this family (34)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3995902B2 (en) * | 2001-05-31 | 2007-10-24 | Ｈｏｙａ株式会社 | Glass substrate for information recording medium and magnetic information recording medium using the same |
| JP4619115B2 (en) * | 2002-06-03 | 2011-01-26 | Ｈｏｙａ株式会社 | Glass substrate for information recording medium and information recording medium |
| SG171640A1 (en) | 2006-06-08 | 2011-06-29 | Hoya Corp | Glass for use in substrate for information recording medium, substrate for information recording medium and information recording medium, and their manufacturing method |
| US8715841B2 (en) | 2008-07-14 | 2014-05-06 | Hideki Kawai | Glass substrate for information recording medium and information recording medium |
| JP5539872B2 (en) * | 2008-07-14 | 2014-07-02 | Ｈｏｙａ株式会社 | Glass substrate for information recording medium and information recording medium |
| JP5528026B2 (en) * | 2009-08-07 | 2014-06-25 | 旭硝子株式会社 | Glass for information recording medium substrate, glass substrate for information recording medium and magnetic disk |
| CN102167507B (en) * | 2010-02-26 | 2016-03-16 | 肖特玻璃科技(苏州)有限公司 | For the thin lithium aluminosilicate glass of 3D tight mould pressing |
| AU2012328981B2 (en) | 2011-10-25 | 2016-07-07 | Corning Incorporated | Alkaline earth alumino-silicate glass compositions with improved chemical and mechanical durability |
| EP3502070B1 (en) | 2011-10-25 | 2023-07-26 | Corning Incorporated | Glass compositions with improved chemical and mechanical durability |
| US9517966B2 (en) | 2011-10-25 | 2016-12-13 | Corning Incorporated | Glass compositions with improved chemical and mechanical durability |
| EP2771294B1 (en) | 2011-10-25 | 2017-12-13 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| US10350139B2 (en) | 2011-10-25 | 2019-07-16 | Corning Incorporated | Pharmaceutical glass packaging assuring pharmaceutical sterility |
| US9763852B2 (en) | 2012-02-28 | 2017-09-19 | Corning Incorporated | Glass articles with low-friction coatings |
| US11497681B2 (en) | 2012-02-28 | 2022-11-15 | Corning Incorporated | Glass articles with low-friction coatings |
| US10737973B2 (en) | 2012-02-28 | 2020-08-11 | Corning Incorporated | Pharmaceutical glass coating for achieving particle reduction |
| US10273048B2 (en) | 2012-06-07 | 2019-04-30 | Corning Incorporated | Delamination resistant glass containers with heat-tolerant coatings |
| US9034442B2 (en) | 2012-11-30 | 2015-05-19 | Corning Incorporated | Strengthened borosilicate glass containers with improved damage tolerance |
| US10117806B2 (en) | 2012-11-30 | 2018-11-06 | Corning Incorporated | Strengthened glass containers resistant to delamination and damage |
| US9707154B2 (en) | 2013-04-24 | 2017-07-18 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| US9713572B2 (en) | 2013-04-24 | 2017-07-25 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| US9707155B2 (en) | 2013-04-24 | 2017-07-18 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| US9717649B2 (en) | 2013-04-24 | 2017-08-01 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| US9700485B2 (en) | 2013-04-24 | 2017-07-11 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| US9700486B2 (en) | 2013-04-24 | 2017-07-11 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| US9849066B2 (en) | 2013-04-24 | 2017-12-26 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| US9717648B2 (en) | 2013-04-24 | 2017-08-01 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| US9707153B2 (en) | 2013-04-24 | 2017-07-18 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| US9839579B2 (en) | 2013-04-24 | 2017-12-12 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| US9603775B2 (en) | 2013-04-24 | 2017-03-28 | Corning Incorporated | Delamination resistant pharmaceutical glass containers containing active pharmaceutical ingredients |
| JP5733368B2 (en) * | 2013-10-22 | 2015-06-10 | 旭硝子株式会社 | Glass for information recording medium substrate, glass substrate for information recording medium and magnetic disk |
| MX2017002898A (en) | 2014-09-05 | 2017-10-11 | Corning Inc | Glass articles and methods for improving the reliability of glass articles. |
| RU2704397C2 (en) | 2014-11-26 | 2019-10-28 | Корнинг Инкорпорейтед | Methods for production of reinforced and glass containers with longer service life |
| EP3150564B1 (en) | 2015-09-30 | 2018-12-05 | Corning Incorporated | Halogenated polyimide siloxane chemical compositions and glass articles with halogenated polylmide siloxane low-friction coatings |
| TWI825443B (en) | 2015-10-30 | 2023-12-11 | 美商康寧公司 | Glass articles with mixed polymer and metal oxide coatings |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01239036A (en) * | 1988-03-16 | 1989-09-25 | F G K:Kk | High-strength glass |
| JP2837005B2 (en) * | 1991-05-20 | 1998-12-14 | ホーヤ株式会社 | Glass for chemical strengthening |
| JP2977068B2 (en) * | 1994-08-05 | 1999-11-10 | 日本板硝子株式会社 | Glass for chemical strengthening |
-
1999
- 1999-02-04 JP JP02759999A patent/JP3657453B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11314931A (en) | 1999-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3657453B2 (en) | Information processing recording medium | |
| JP3187321B2 (en) | Chemically strengthened glass composition and chemically strengthened glass article | |
| JP4086211B2 (en) | Glass composition and method for producing the same | |
| CN110845153B (en) | Reinforced microcrystalline glass with high-pressure stress layer depth and preparation method thereof | |
| JP4785274B2 (en) | Glass article and glass substrate for magnetic recording medium using the same | |
| CN100379696C (en) | Chemically strengthened glass, substrate for information recording medium and information recording medium | |
| US5900296A (en) | Glass substrate for magnetic disk | |
| US6376402B1 (en) | Glasses and glass-ceramics with high specific young's modulus and their applications | |
| JP5977841B2 (en) | Glass composition, glass composition for chemical strengthening, tempered glass article, and cover glass for display | |
| JP4497591B2 (en) | Glass composition, substrate for information recording medium and information recording medium using the same | |
| WO2020082328A1 (en) | Microcrystalline glass product and microcrystalline glass for electronic equipment cover plate | |
| JP2977068B2 (en) | Glass for chemical strengthening | |
| JP2001229526A (en) | Magnetic disk substrate consisting of glass composition for chemical strengthening and magnetic disk medium | |
| JP2001236634A (en) | Magnetic disk substrate comprising glass composition for chemical strengthening and magnetic disk medium | |
| JPH0532431A (en) | Glass for chemical reinforcement | |
| US20020049128A1 (en) | Glass composition and process for producing the same | |
| US6593257B1 (en) | Glass-ceramic composition for recording disk substrate | |
| JPH11302032A (en) | Glass composition and substrate for information recording medium using same | |
| JP4086210B2 (en) | Substrate for information recording medium | |
| WO2024109495A1 (en) | 3d microcrystalline glass, preparation method therefor, and pre-crystallized microcrystalline glass | |
| US6524982B1 (en) | Glass-ceramic composition for recording disk substrate | |
| JP2001172043A (en) | Glass used for substrate of data recording medium, and glass substrate of data recording medium | |
| JP3702360B2 (en) | Method for producing glass base plate for chemical strengthening | |
| US6514890B1 (en) | Glass-ceramic composition for recording disk substrate | |
| CN116874190A (en) | High-strength transparent glass ceramic and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20050308 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20050309 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080318 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090318 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100318 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110318 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110318 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120318 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120318 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130318 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130318 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140318 Year of fee payment: 9 |
|
| EXPY | Cancellation because of completion of term |