JP2000272931A - Press molding glass and substrate glass for information recording medium - Google Patents
Press molding glass and substrate glass for information recording mediumInfo
- Publication number
- JP2000272931A JP2000272931A JP11080809A JP8080999A JP2000272931A JP 2000272931 A JP2000272931 A JP 2000272931A JP 11080809 A JP11080809 A JP 11080809A JP 8080999 A JP8080999 A JP 8080999A JP 2000272931 A JP2000272931 A JP 2000272931A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- press
- temperature
- press molding
- ion exchange
- 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
Landscapes
- Surface Treatment Of Glass (AREA)
- Glass Compositions (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、熱軟化ガラスをプ
レス成形し、更にアルカリイオン交換により化学強化し
て、レンズ等の光学用ガラス、小型基板ガラスなどのガ
ラス成形体を得るうえで好適なプレス成形用ガラスに係
り、特に磁気記録媒体などとして好適に採用し得る情報
記録媒体用基板ガラスに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for press-molding heat-softened glass and further chemically strengthening the same by alkali ion exchange to obtain glass molded articles such as optical glasses such as lenses and small-sized substrate glasses. The present invention relates to glass for press molding, and particularly to a substrate glass for an information recording medium which can be suitably employed as a magnetic recording medium.
【０００２】[0002]
【従来技術】例えば情報記録媒体用基板ガラスとして
は、ソーダ石灰シリカ系ガラス並、またはそれより低い
温度で容易に溶融でき、またソーダ石灰シリカ系ガラス
より低い軟化温度を有し、プレス成形が容易でプレス型
に倣った精緻な面を形成でき、かつプレス成形型とも熱
膨張係数が近似していて型くずれし難く、更にアルカリ
イオン交換によるいわゆる化学強化度合いの高いことが
要求される。2. Description of the Related Art For example, as a substrate glass for an information recording medium, it can be easily melted at a temperature equal to or lower than that of soda-lime-silica glass, has a softening temperature lower than that of soda-lime-silica glass, and is easy to press-mold. Therefore, it is required that a precise surface similar to that of a press die can be formed, the thermal expansion coefficient of both press molds is close to that of the press die, the shape of the press die does not easily collapse, and the degree of so-called chemical strengthening by alkali ion exchange is high.
【０００３】なお、従来一旦プレス成形したガラスを、
面平滑性を得るために研磨する方法を採るのが一般的で
あったが、研磨に時間、手間を要し、コストも高騰する
ので好ましくない。別にフロート成形法により滑らかな
面を形成する提唱例もあるが、フロート成形法は窓ガラ
ス等の比較的大サイズのガラスを大量生産するうえでは
好適であるが、情報記録媒体用基板等の小型で精密な基
板を製造するうえには適さない。[0003] Conventionally, once press-molded glass,
Although it is common to employ a polishing method to obtain surface smoothness, polishing is time-consuming and troublesome, and costs are increased, which is not preferable. Although there is another proposal to form a smooth surface by the float molding method, the float molding method is suitable for mass-producing relatively large-sized glass such as a window glass. And not suitable for producing precise substrates.
【０００４】公知の例では、例えば米国特許第4156755
号明細書には、SiO2−Al2O3−Li2O−Na2O系において更
にZrO2を含むガラスであって、イオン交換によるところ
の強化ガラスが開示されているが、このガラスはAl2O3
＋ZrO2の量が比較的多く、溶融、成型温度も高くなり、
易溶性、成形性（特にプレス成形）に課題を残す。In a known example, for example, US Pat. No. 4,156,755
The specification discloses a glass further containing ZrO 2 in the SiO 2 —Al 2 O 3 —Li 2 O—Na 2 O system, which is tempered glass by ion exchange. Al 2 O 3
+ The amount of ZrO 2 is relatively large, and the melting and molding temperatures are high,
Problems remain in easy solubility and moldability (especially press molding).
【０００５】特開平10−1329号公報には、SiO2−Al2O3
−Li2O−Na2O−CaO系であって、ZrO2を含まない、フロ
ート法成形に適した化学強化用ガラス組成物および化学
強化ガラス物品が開示されている。一般に、化学強化ガ
ラスは水分（湿分）による劣化が懸念されるところであ
り、特に、情報記録媒体などの精密電子機器用に供する
場合は、厳しい耐候、耐湿性が要求される。ZrO2成分の
含有が耐候、耐湿性に優れることは知られているが、本
公知例においてはZrO2を含まない分、前記特性を満足し
難いと思われる。Japanese Patent Application Laid-Open No. Hei 10-1329 discloses that SiO 2 —Al 2 O 3
A -Li 2 O-Na 2 O- CaO -based, contains no ZrO 2, chemically strengthened glass composition suitable for float forming and is chemically strengthened glass article is disclosed. Generally, chemically strengthened glass is likely to be degraded by moisture (moisture), and particularly when used for precision electronic devices such as information recording media, severe weather resistance and moisture resistance are required. It is known that the content of the ZrO 2 component is excellent in weather resistance and moisture resistance. However, in the known examples, since the ZrO 2 is not contained, it is difficult to satisfy the above-mentioned properties.
【０００６】特開平５−32431号公報には、SiO2−Al2O3
−Li2O−Na2O−ZrO2系からなる化学強化用ガラス、およ
びそれを用いた化学強化ガラスが開示されている。該公
知例の化学強化用ガラスは、上記とは逆にZrO2分を過量
に含むが、過量の含有はガラスの溶融温度を高くし、成
形、特にプレス成形を困難とする。[0006] JP-A-5-32431 discloses SiO 2 -Al 2 O 3
Disclosed is a glass for chemical strengthening composed of —Li 2 O—Na 2 O—ZrO 2 system and a chemically strengthened glass using the same. Conversely, the glass for chemical strengthening of this known example contains ZrO 2 in an excessive amount. However, an excessive amount increases the melting temperature of the glass and makes molding, particularly press molding, difficult.
【０００７】特開平10−158028号公報には、SiO2−Al2O
3−Na2O−K2O−RO−ZrO2系ガラス（前記ROは、MgO、Ca
O、SrO、BaOである）からなり、傷がつき難く、フロー
ト成形にも適した磁気ディスク用ガラス基板および磁気
ディスクが開示されている。該公知例のガラスは、Na2O
分に比べK2O分を多量に含有するが、溶融カリウム塩に
よりガラス中のナトリウム分をイオン交換するという観
点からすれば、効率的なイオン交換をし難いと思われ
る。また、溶融温度、成形温度も高い。Japanese Patent Application Laid-Open No. Hei 10-158028 discloses SiO 2 —Al 2 O
3 -Na 2 O-K 2 O -RO-ZrO 2 based glass (the RO is, MgO, Ca
A glass substrate for a magnetic disk and a magnetic disk which are made of O, SrO, and BaO), are hardly damaged, and are suitable for float molding are disclosed. The known glass is made of Na 2 O
It contains a larger amount of K 2 O than that of glass, but from the viewpoint of ion exchange of the sodium in the glass by the molten potassium salt, it seems difficult to perform efficient ion exchange. In addition, the melting temperature and the molding temperature are high.
【０００８】[0008]
【発明が解決しようとする課題】すなわち、従来易溶
性、プレス成形をはじめとする成形性に難点があった
り、耐候、耐湿性が不充分であったり、イオン交換によ
る化学強化性を満足し得なかったりするケースがあった
が、本発明は容易に溶融でき、プレス成形が容易でプレ
ス型に倣った精緻な面を形成でき、かつプレス成形型と
も熱膨張係数を近似させることができて型くずれし難
く、更にアルカリイオン交換によるいわゆる化学強化度
合いの高いプレス成形用ガラスを提供すること、特に磁
気記録媒体などとして好適に採用し得る情報記録媒体用
基板ガラスを提供することを目的とする。That is, there is a problem in the conventional formability such as easy solubility and press molding, insufficient weather resistance and moisture resistance, and satisfactory chemical strengthening by ion exchange. In some cases, the present invention can be easily melted, can be easily press-formed, can form a precise surface following the press mold, and can approximate the thermal expansion coefficient of both the press mold and the mold collapse. It is an object of the present invention to provide a glass for press forming, which is difficult to perform and has a high degree of so-called chemical strengthening by alkali ion exchange, and particularly to provide a substrate glass for an information recording medium which can be suitably employed as a magnetic recording medium.
【０００９】[0009]
【課題を解決するための手段】本発明は、ガラスを熱軟
化状態でプレス成形し、更に該成形物をアルカリイオン
交換によるところの化学強化を施すための前記プレス成
形体を得るためのガラスにおいて、ガラスの成分組成
が、wt％で、SiO2 58〜65、Al2O3 10〜15、Li2O ４〜
６、Na2O 10〜13、K2O ０〜３、MgO ０〜４、CaO ０〜
４、SrO ０〜２、BaO １〜10、TiO2 ０〜５、ZrO2 １〜
５の範囲としたプレス成形用ガラスである。SUMMARY OF THE INVENTION The present invention relates to a glass for press-forming glass in a heat-softened state and further obtaining the above-mentioned press-formed body for subjecting the molded product to chemical strengthening by alkali ion exchange. , composition of the glass, in wt%, SiO 2 58~65, Al 2 O 3 10~15, Li 2 O 4~
6, Na 2 O 10~13, K 2 O 0~3, MgO 0~4, CaO 0~
4, SrO 0~2, BaO 1~10, TiO 2 0~5, ZrO 2 1~
This is a glass for press molding having a range of 5.
【００１０】上記において、ガラスの102ポイズ相当温
度が1450℃以下、104ポイズ相当温度が1000℃以下、軟
化点が700℃以下であることが好ましい。In the above, it is preferable that the glass has a temperature equivalent to 10 2 poises of 1450 ° C. or less, a temperature equivalent to 10 4 poises of 1000 ° C. or less, and a softening point of 700 ° C. or less.
【００１１】加えて、ガラスの1010ポイズ相当温度が60
0℃以下であることが望ましい。In addition, the temperature corresponding to 10 10 poise of glass is 60
It is desirable that the temperature be 0 ° C or lower.
【００１２】本発明はまた、上記プレス成形用ガラス
を、その軟化点以下の温度でプレス成形し、更に該成形
物をカリウム塩を含む溶融塩中でアルカリイオン交換
し、化学強化を施した情報記録媒体用基板ガラスであ
る。The present invention also provides information obtained by subjecting the above glass for press molding to press molding at a temperature equal to or lower than its softening point, and further subjecting the molded product to alkali ion exchange in a molten salt containing a potassium salt to chemically strengthen the glass. This is a substrate glass for a recording medium.
【００１３】[0013]
【発明の実施の形態】本発明のプレス成形用ガラスは、
ガラス原料を溶融し、清澄、均質化して得られた溶融ガ
ラスより、例えば鋳込み成形により、一旦目的形状に類
似したかたちの予備成形体を製造し、これを改めて加熱
してプレス成形に供して二段階で製造するものである。
または、前記予備成形形状としたうえで、そのまま保熱
状態で、若干の加熱調整のうえでプレス成形に供して連
続的操作で製造することもできる。BEST MODE FOR CARRYING OUT THE INVENTION The glass for press molding according to the present invention comprises:
From a molten glass obtained by melting, refining, and homogenizing a glass raw material, a preformed body having a shape similar to a target shape is once manufactured by, for example, casting, and then heated again and subjected to press forming. It is manufactured at a stage.
Alternatively, it is also possible to produce the above preformed shape, and in a state of keeping the heat as it is, subject it to press molding after slightly adjusting the heating, and to produce it by a continuous operation.
【００１４】ガラスの溶融に際しては、ガラス粘度102
ポイズにおいて、ガラスがきわめて流動性に富み、溶
融、均質化させるうえで効果を奏する。従って102ポイ
ズ相当温度は溶融温度とも称される。溶融が容易とされ
る一般のソーダ石灰シリカ系ガラスにおける粘度102ポ
イズ相当温度は1400〜1450℃の範囲であるが、本発明の
ガラスにおいてもそれと同等以下、すなわち1450℃以下
とするものである。When the glass is melted, the glass viscosity is 10 2
In poise, the glass is extremely fluid and effective in melting and homogenizing. Thus 10 2 poise corresponds temperature is also referred to as the melting temperature. The temperature corresponding to a viscosity of 10 2 poise in a general soda-lime-silica glass that is easily melted is in the range of 1400 to 1450 ° C., but the glass of the present invention is equivalent to or less than that, that is, 1450 ° C. or less. .
【００１５】前記予備成形するための温度、すなわち作
業温度は、一般的にガラスの粘度10 4ポイズが、ガラス
を板状、容器状等に熱加工するうえで指標となる粘度で
あり、本発明における予備成形にもあてはまるものであ
る。前記104ポイズ相当温度は一般のソーダ石灰シリカ
系ガラスにおいては1000℃程度であり、本発明のガラス
もそれと同等以下、すなわち1000℃以下とする。The temperature for the preforming, that is, the working
The operating temperature is generally 10 FourPoise but glass
With a viscosity that is an indicator for thermal processing of
Yes, it also applies to the preforming in the present invention.
You. 10 aboveFourPoise equivalent temperature is ordinary soda lime silica
In the system glass is about 1000 ℃, the glass of the present invention
Is also equal to or less than that, that is, 1000 ° C. or less.
【００１６】本発明におけるプレス成形に際するプレス
型母材は、耐熱性で耐摩耗性に優れる材料、すなわち合
金鋼（例えばオーステナイト鋼）、サーメット（例えば
TiC-Mo-Ni系）、セラミック（例えばアルミナ、ジルコ
ニア）、耐熱ガラス（例えば高シリカガラス、アルミノ
シリケートガラス）等が採用される。プレス型母材は所
望の形状および光学面に加工、研磨され、更にその上
に、熱軟化した被成形用のガラス（プレス成形用ガラ
ス）がよく密接でき、被成形用のガラスにより侵食され
難い熱的、化学的に安定な薄膜、すなわち、貴金属膜、
タングステン膜、タンタル膜、それら金属の合金膜を、
例えばスパッタ法等により形成することにより、成形面
が形成される。従来、一旦ガラスを成形しても、光学面
を得るうえで成形ガラスの表面を研磨加工していたが、
上記処置を施すことにより、研磨加工をすることなく、
所望の光学面を得ることができる。In the present invention, the press die base material for press forming is made of a material having heat resistance and excellent wear resistance, that is, alloy steel (for example, austenitic steel), cermet (for example,
TiC-Mo-Ni type, ceramic (for example, alumina and zirconia), heat-resistant glass (for example, high silica glass, aluminosilicate glass) and the like are employed. The press-type base material is processed and polished into a desired shape and an optical surface, and further, a heat-softened glass for molding (press-molding glass) can be in close contact therewith, and is hardly eroded by the glass for molding. Thermally and chemically stable thin film, that is, noble metal film,
Tungsten film, tantalum film, alloy film of those metals,
For example, a forming surface is formed by forming by a sputtering method or the like. Conventionally, once the glass was molded, the surface of the molded glass was polished to obtain an optical surface.
By performing the above treatment, without polishing
A desired optical surface can be obtained.
【００１７】勿論被成形用のガラスにおいても、上記光
学面を得るうえで、熱物性その他においてプレス成形に
適した特性を必要とし、また、更にイオン交換、化学強
化を施すうえでも適した特性を必要とするものである。Of course, the glass to be molded also needs properties suitable for press molding in terms of thermophysical properties and the like in order to obtain the above-mentioned optical surface, and also has properties suitable for performing ion exchange and chemical strengthening. It is what you need.
【００１８】プレス成形におけるガラス粘度は、ガラス
軟化点相当の107.6ポイズないし101 2ポイズ、より好適
には1010ポイズ付近とするのがよい。107.6ポイズ未満
の低い粘度では、被成形用ガラスがプレス型の面に被着
し易く、剥離が容易ではなくなり、また剥離の際ガラス
が型崩れを生じ易い。またプレス型の損耗が激しくな
る。1012ポイズ超過の高い粘度では、被成形用ガラスが
プレス型の面と密接し難く（馴染み難く）なり、プレス
型の面に精緻に倣った光学面を得難くなる。The glass in the press molding viscosity is from 10 7.6 poise corresponds glass softening point 10 1 2 poise, and more preferably preferably set to 10 10 near poise. At a low viscosity of less than 10 7.6 poise, the glass to be molded easily adheres to the surface of the press die, and the glass is not easily peeled off, and the glass is easily deformed at the time of peeling. In addition, the press die becomes severely worn. If the viscosity is higher than 10 12 poise, the glass to be molded is less likely to be in close contact with the surface of the press die (it is difficult to adapt), and it is difficult to obtain an optical surface that closely follows the surface of the press die.
【００１９】前記プレス成形する際の温度に関し、前記
プレス型母材および薄膜が耐熱性、耐摩耗性で、対侵食
性に優れるとはいえ、高温で繰返しプレスすると、摩耗
により光学面を損じ易い。従って107.6ポイズ相当温度
（軟化点）は、一般のソーダ石灰シリカ系ガラスが720
〜740℃程度であるのに対し、700℃以下とするのが好ま
しく、より好適粘度、すなわち1010ポイズにおいては60
0℃以下とするのがよい。Regarding the temperature at the time of the press molding, although the press mold base material and the thin film are excellent in heat resistance and abrasion resistance and are excellent in erosion resistance, when pressed repeatedly at a high temperature, the optical surface is easily damaged by abrasion. . Therefore, the temperature equivalent to 10 7.6 poise (softening point) is 720% for ordinary soda-lime-silica glass.
About 740 ° C., preferably 700 ° C. or less, more preferably viscosity of 60 ° C. at 10 10 poise.
The temperature is preferably set to 0 ° C. or lower.
【００２０】またプレス成形圧を10Kgf／cm2ないし50Kg
f／cm2の範囲とするのがよい。プレス成形圧を50Kgf／c
m2を越えた高圧力とすると、ガラスにひび割れ、破損を
生じ易くなり、またプレス型自体も損耗する。プレス成
形圧を10Kgf／cm2未満の低圧力とすると、プレス型の面
に倣った光学面を得難くなる。Further, the press forming pressure is 10 kgf / cm 2 to 50 kg.
It is better to be in the range of f / cm 2 . Press forming pressure 50Kgf / c
If the pressure is higher than m 2 , the glass is liable to crack and break, and the press die itself is worn. When the press forming pressure is set to a low pressure of less than 10 kgf / cm 2 , it is difficult to obtain an optical surface following the surface of the press die.
【００２１】上記ガラス粘度（温度）−成形圧力範囲に
おいて、被成形ガラスは前記プレス型（薄膜）ともよく
密接し、従って微細にわたり前記母材の光学面に一致し
た光学面を得ることができる。In the glass viscosity (temperature) -molding pressure range, the glass to be molded is in close contact with the press die (thin film), and therefore, an optical surface that is finely matched to the optical surface of the base material can be obtained.
【００２２】ガラスの熱膨張係数はプレス型のそれと近
似させる。熱膨張係数は室温〜転移点間の平均値として
60〜120×10-7／℃の間で適宜設定し、例えばプレス型
が耐熱鋼や大半の耐熱セラミックの場合は100〜120×10
-7／℃程度、アルミノシリケートガラスの場合は70〜80
×10-7／℃程度とする。The coefficient of thermal expansion of glass is similar to that of a press mold. Thermal expansion coefficient is the average value between room temperature and transition point
Set appropriately between 60-120 × 10 -7 / ° C. For example, when the press die is made of heat-resistant steel or most heat-resistant ceramics, 100-120 × 10 -7 / ° C.
-7 / ℃, 70-80 for aluminosilicate glass
About × 10 -7 / ° C.
【００２３】本発明のプレス成形用ガラスにおいて、ア
ルカリイオン交換による化学強化は、その条件を特定す
るものではなく、ガラスが熱変形し難い歪点以下、かつ
硝酸ナトリウムおよび／または硝酸カリウムの融点以上
の温度の溶融塩中にガラスを浸漬し、数時間のオーダー
でイオン交換処理を行う。なお、情報記録媒体用基板ガ
ラスとしては、化学強化後の３点曲げ強度において、３
×103Kgf／cm2以上が好適とされる。In the press-molding glass of the present invention, the chemical strengthening by alkali ion exchange does not specify the condition, and is not more than the strain point at which the glass is hardly thermally deformed and at least the melting point of sodium nitrate and / or potassium nitrate. The glass is immersed in a molten salt at a temperature and subjected to ion exchange treatment in the order of several hours. In addition, as a substrate glass for an information recording medium, the three-point bending strength after chemical strengthening is 3%.
× 10 3 Kgf / cm 2 or more is preferable.
【００２４】プレス成形用ガラスは、以下の成分組成よ
りなる。SiO2はガラスを形成する主要成分であり、ガラ
ス中58〜65wt％の範囲で含有させる。58wt％未満では、
ガラス形成が容易ではなくなり、失透が生じ易く、イオ
ン交換による化学強化後のガラスの耐水性において劣
る。65wt％を越えるとガラス溶融温度を高くし、また予
備成形を含めた成形、特にプレス成形するうえで、成形
温度を上昇する。The glass for press molding has the following composition. SiO 2 is the main component for forming a glass, is contained in a range in 58～65Wt% glass. If it is less than 58 wt%,
Glass formation is not easy, devitrification tends to occur, and the glass after chemical strengthening by ion exchange is inferior in water resistance. If it exceeds 65 wt%, the glass melting temperature is increased, and the molding temperature is increased in molding including pre-molding, especially in press molding.
【００２５】Al2O3は、SiO2に伴わせてガラスを形成す
る成分でもあるが、化学強化に際するイオン交換速度を
速めるうえで、および化学強化後のガラスの耐水性を向
上させるうえで必須の成分であり、ガラス中10〜15wt％
の範囲で含有させる。10wt％未満では前記作用効果が不
十分であり、15wt％を越えるとガラス粘度を高くし、予
備成形、プレス成形の温度を上昇する。Al 2 O 3 is also a component that forms glass together with SiO 2 , but is used to increase the ion exchange rate during chemical strengthening and to improve the water resistance of glass after chemical strengthening. Indispensable ingredient in glass, 10 ~ 15wt%
Content within the range. If the amount is less than 10% by weight, the above effect is insufficient. If the amount exceeds 15% by weight, the viscosity of the glass is increased, and the temperature of preforming and press forming is increased.
【００２６】Li2Oはイオン交換による化学強化を行うた
め必須の成分であるとともに、比較的低温度でのガラス
溶融、および成形を容易にするうえで必須の成分であ
り、ガラス中４〜６wt％の範囲で含有させる。４wt％未
満ではガラスの粘度が高くなり、前記溶融、成形温度を
上昇する。６wt％超過ではガラス粘度を必要以上に低
め、またイオン交換による化学強化後のガラスの耐水性
を悪化する。Li 2 O is an essential component for performing chemical strengthening by ion exchange, and is also an essential component for facilitating glass melting and molding at a relatively low temperature. %. If it is less than 4% by weight, the viscosity of the glass increases, and the melting and molding temperatures increase. If it exceeds 6% by weight, the viscosity of the glass is unnecessarily lowered, and the water resistance of the glass after chemical strengthening by ion exchange deteriorates.
【００２７】Na2OはLi2O同様、イオン交換による化学強
化を行うため必須の成分であって、ガラス溶解性、成形
性を容易とする成分である。また、他のアルカリ金属成
分原料より安価に入手できる。Na2Oはガラス中10〜13wt
％の範囲で含有させるもので、10wt％未満ではガラスの
粘度が高くなり、前記溶融、成形温度を上昇する。13wt
％超過ではガラス粘度を必要以上に低め、またイオン交
換による化学強化後のガラスの耐水性を悪化する。Na 2 O, like Li 2 O, is an essential component for performing chemical strengthening by ion exchange, and is a component that facilitates glass melting and moldability. Also, it can be obtained at lower cost than other alkali metal component raw materials. Na 2 O is in the glass 10~13wt
%, And if it is less than 10 wt%, the viscosity of the glass increases, and the melting and molding temperatures increase. 13wt
%, The glass viscosity becomes unnecessarily low, and the water resistance of the glass after chemical strengthening by ion exchange deteriorates.
【００２８】K2Oはガラスの溶融性を高めるうえで、ま
たガラスの粘度や熱膨張係数を調整するうえで、必要に
応じ適宜導入するものである。なお、ガラス中３wt％を
越えると熱膨張係数を過大としたり、ガラス粘度を必要
以上に低めるので３wt％以下とするのがよい。K 2 O is appropriately introduced as necessary to enhance the melting property of the glass and to adjust the viscosity and the coefficient of thermal expansion of the glass. If the content exceeds 3% by weight in the glass, the coefficient of thermal expansion becomes excessive or the viscosity of the glass becomes unnecessarily low.
【００２９】MgOはガラスの溶解性を高めるうえで、ま
たガラスの粘度や熱膨張係数を調整するうえで、必要に
応じ適宜導入するものである。MgOはCaO同様、アルカリ
金属成分原料より安価に入手できる利点がある。但しガ
ラス中４wt％を越えて含有させるとイオン交換速度を低
下させるので４wt％以下が望ましい。MgO is appropriately introduced as necessary to enhance the solubility of the glass and to adjust the viscosity and the coefficient of thermal expansion of the glass. MgO, like CaO, has the advantage of being available at a lower cost than alkali metal component raw materials. However, if the content exceeds 4% by weight in the glass, the ion exchange rate is reduced, so the content is preferably 4% by weight or less.
【００３０】CaOもガラスの溶融性を高め、ガラスの粘
度や熱膨張係数を調整するうえで、必要に応じ適宜導入
する成分である。なお、ガラス中４wt％を越えて含有さ
せるとイオン交換速度を低下させるので４wt％以下が望
ましい。CaO is also a component that is appropriately introduced as necessary in order to enhance the meltability of the glass and adjust the viscosity and the coefficient of thermal expansion of the glass. If the content exceeds 4% by weight in the glass, the ion exchange rate is reduced.
【００３１】BaOはガラスの溶融性を高め、またガラス
の液相温度を下げるのに有効な成分である。また、Na2O
やK2O等のアルカリ金属成分程ガラスの熱膨張係数を過
大とすることなく成形温度を下げ、成形性を容易とし、
また前記アルカリ金属成分のように耐水性を悪化させる
こともない。BaOはガラス中１〜10wt％の範囲で含有さ
せるもので、１wt％未満では前記作用効果が小さく、10
wt％を越えて含有させる必要はなく、却ってガラスの熱
膨張係数を過大とし易い。BaO is an effective component for increasing the melting property of the glass and lowering the liquidus temperature of the glass. Also, Na 2 O
And K lowering the molding temperature without enough alkali metal component 2 O such that excessive thermal expansion coefficient of the glass, and easy moldability,
Also, the water resistance is not deteriorated unlike the alkali metal component. BaO is contained in the glass in the range of 1 to 10% by weight.
It is not necessary to contain more than wt%, but rather the thermal expansion coefficient of the glass tends to be excessive.
【００３２】TiO2はガラスの粘度や熱膨張係数を調整
し、またイオン交換による化学強化後のガラスの化学的
耐久性を向上させるうえで適宜含有させる成分である。
但しガラス中５wt％を越えて含有させると、ガラスの粘
度を高め、ガラスの溶融、成形性を悪化させるので５wt
％以下とするのがよい。TiO 2 is a component that is appropriately contained in order to adjust the viscosity and coefficient of thermal expansion of the glass and to improve the chemical durability of the glass after chemical strengthening by ion exchange.
However, if the content exceeds 5 wt% in the glass, the viscosity of the glass is increased, and the melting and forming properties of the glass are deteriorated.
% Or less.
【００３３】ZrO2はイオン交換速度を速め、またイオン
交換後の耐水性を向上させるうえで必須とするもので、
ガラス中１〜５wt％の範囲で含有させる。１wt％未満で
はそれら作用効果が不十分であり、５wt％を越えるとガ
ラスの粘度を高め、溶融、成型温度を上昇するので好ま
しくない。ZrO 2 is essential for increasing the ion exchange rate and improving the water resistance after ion exchange.
It is contained in the glass in the range of 1 to 5% by weight. If the amount is less than 1% by weight, the effects are insufficient. If the amount exceeds 5% by weight, the viscosity of the glass is increased, and the melting and molding temperatures are undesirably increased.
【００３４】[0034]
【実施例】〔ガラス溶融〕シリカ源として光学珪砂、ア
ルミナ源として酸化アルミニウム、酸化リチウム源とし
て炭酸リチウム、酸化ナトリウム源として炭酸ソーダ、
酸化カリウム源として炭酸カリウム、マグネシア源とし
て酸化マグネシウム、カルシア源として炭酸カルシウ
ム、酸化バリウム源として炭酸バリウム、チタニア源と
して二酸化チタン、ジルコニア源としてジルコン砂を採
用し、表１に示すガラス組成に則って各原料を秤量、調
合した。EXAMPLE [Glass melting] Optical silica sand as a silica source, aluminum oxide as an alumina source, lithium carbonate as a lithium oxide source, sodium carbonate as a sodium oxide source,
Potassium carbonate was used as the potassium oxide source, magnesium oxide was used as the magnesia source, calcium carbonate was used as the calcia source, barium carbonate was used as the barium oxide source, titanium dioxide was used as the titania source, and zircon sand was used as the zirconia source. Each raw material was weighed and prepared.
【００３５】ガラス重量で３Kg相当の調合バッチを2Lの
白金るつぼに充填し、電気炉内で、1300℃−５時間予備
溶融の後、1480℃−５時間、スターラーで撹拌しつつ溶
融し、その後温度を降下させ、1300℃−２時間かけて清
澄化させ、るつぼを取り出し、カーボン製型枠内に流し
込み、ガラスブロックを得た。ガラスブロックは、更に
予め600℃に加熱調整した電気炉内にセットし、10分維
持後、加熱を止めて炉内放冷することにより徐冷した。A blended batch equivalent to 3 kg in glass weight is filled in a 2 L platinum crucible, pre-melted in an electric furnace at 1300 ° C. for 5 hours, and then melted while stirring with a stirrer at 1480 ° C. for 5 hours. The temperature was lowered and clarification was performed at 1300 ° C. for 2 hours. The crucible was taken out and poured into a carbon mold to obtain a glass block. The glass block was set in an electric furnace preliminarily heated to 600 ° C., maintained for 10 minutes, and then gradually cooled by stopping heating and allowing the furnace to cool.
【００３６】〔ガラスの粘度測定〕得られたガラスの一
部を切り出して、再度白金るつぼ内で加熱溶融し、公知
の球引き上げ法により102ポイズ相当温度（溶融温
度）、104ポイズ相当温度（作業温度）を測定した。ま
た、ガラスの一部を切り出して所定の細線状に加熱成形
し、公知のファイバーエロンゲーション法により軟化点
（107,6ポイズ相当温度）を測定し、同様に歪点（10
14,5ポイズ相当温度）を測定した。溶融温度において14
50℃以下、作業温度において1000℃以下、軟化点におい
て700℃以下を良好とする。歪点は特定するものではな
いが、アルカリイオン交換による化学強化処理は、歪点
以下で行われるものである。The cut out portion of the glass obtained Viscosimetry glass], and heated and melted in again a platinum crucible, by a known ball pulling method 10 2 poises corresponding temperature (melting temperature), 10 4 poises corresponding temperature (Working temperature) was measured. Also, cutting out a portion of the glass to heat molding to a predetermined thin line, to measure the softening point (10 7,6 poises equivalent temperature) by a known fiber elongation method, as the strain point (10
14,5 poise equivalent temperature) was measured. 14 at the melting temperature
Good is 50 ° C or less, working temperature is 1000 ° C or less, and softening point is 700 ° C or less. Although the strain point is not specified, the chemical strengthening treatment by alkali ion exchange is performed below the strain point.
【００３７】なお、前記各特性粘度−温度から、公知の
Fulcherによる粘度−温度関係式、logη＝-Ａ+Ｂ／(Ｔ-
ＴO) [但しＡ、Ｂ、ＴOは定数、ηは粘度、Ｔは絶対温
度]により1010ポイズ相当温度（好ましいプレス成形温
度）を求めた。前記プレス成形温度は600℃以下とする
のが好ましい。It should be noted that, from the above-mentioned respective characteristic viscosities and temperatures, a known
Fulcher's viscosity-temperature relationship, log η = -A + B / (T-
The temperature corresponding to 10 10 poise (preferable press molding temperature) was determined by T O ), where A, B, and T O are constants, η is the viscosity, and T is the absolute temperature. The press molding temperature is preferably set to 600 ° C. or lower.
【００３８】〔ガラスの熱膨張係数、転移点の測定〕ま
た、ガラスブロックの一部を切り出して所定の棒状に成
形し、示唆熱膨脹計により、転移点および室温〜転移点
の平均熱膨張係数を求めた。[Measurement of Thermal Expansion Coefficient and Transition Point of Glass] Further, a part of a glass block was cut out and formed into a predetermined rod shape, and the average thermal expansion coefficient between the transition point and room temperature to the transition point was measured with a suggestive thermal dilatometer. I asked.
【００３９】〔イオン交換ガラスの作製および曲げ強
度、耐水性の測定〕更に、ガラスブロックを切断し、研
磨して、サイズ50×10×３mm(厚み)としたものについ
て、以下の条件でアルカリイオン交換処理し、その後、
JIS R 1601（ファインセラミックスの曲げ強さ試験方
法）に則り、３点曲げ強度を測定した。強度３×103Kgf
／cm2以上において良好とされる。[Preparation of ion exchange glass and measurement of bending strength and water resistance] Further, a glass block was cut and polished to a size of 50 × 10 × 3 mm (thickness). Exchange, then
The three-point bending strength was measured in accordance with JIS R 1601 (Testing method for bending strength of fine ceramics). Strength 3 × 10 3 Kgf
/ Cm 2 or more.
【００４０】また、同様なアルカリイオン交換処理した
ガラスについて、１L、95℃の純水中に40時間浸漬保持
後取り出し、浸漬前後の試料重量から、単位表面積（１
cm2）当たりの重量減少量（mg）を求めた。減少量0.05m
ｇ／cm2以下が良好とされる。The same alkali ion exchange-treated glass was immersed in 1 L of pure water at 95 ° C. for 40 hours, taken out, and taken out from the sample weight before and after immersion.
Weight loss (mg) per cm 2 ) was determined. 0.05m reduction
g / cm 2 or less is considered good.
【００４１】なお、アルカリイオン交換条件は以下のと
おりである。 試料NO.1〜16：硝酸ナトリウム40wt％、硝酸カリウム60
wt％からなる溶融塩中でガラス試料を400℃−４時間浸
漬処理した。 試料NO.17、18（Li2O非含有）：硝酸カリウム100wt％の
溶融塩中でガラス試料を430℃−４時間浸漬処理した。The conditions for the alkali ion exchange are as follows. Sample No.1-16: Sodium nitrate 40wt%, potassium nitrate 60
The glass sample was immersed in a molten salt consisting of wt% at 400 ° C. for 4 hours. Sample Nos. 17 and 18 (not containing Li 2 O): A glass sample was immersed in a molten salt of 100 wt% potassium nitrate at 430 ° C. for 4 hours.
【００４２】〔ガラスの成形性〕ガラスブロックをノズ
ル付白金ルツボに投入し、再加熱、脱泡した後、ノズル
部を作業温度以上に上げ、該ノズル端よりガラスを予備
成形枠上に滴下し、上部自由表面を有する予備成形体
（サイズ20mmφ×５mm厚からなる滴下試料）を作製し
た。これを、オーステナイト鋼よりなり、成形光学面を
Pt−Rh膜で膜付けした上凹型、下凹型の一対の成形型に
挟み込み、600℃−10分、プレス圧30Kg／cm2の条件で熱
間プレスしたまま、400℃まで冷却し、その後圧力を開
放して放冷し、取出して評価した。[Formability of Glass] A glass block is put into a platinum crucible with a nozzle, reheated and defoamed. Then, the nozzle is heated to a working temperature or higher, and glass is dropped from a nozzle end onto a preforming frame. A preform having a top free surface (a drop sample having a size of 20 mmφ and a thickness of 5 mm) was prepared. This is made of austenitic steel and has a molded optical surface
It is sandwiched between a pair of upper and lower concave molds coated with a Pt-Rh film, cooled to 400 ° C while hot pressed at 600 ° C for 10 minutes and at a pressing pressure of 30 kg / cm 2 , and then pressurized. Was released, allowed to cool, removed, and evaluated.
【００４３】評価基準として、触針法によるところの表
面粗さが２nm以下であり、皺、ヒビ割れ等のないものを
合格（○で表示）、表面粗さが２nm以上であり、または
皺、ヒビ割れがある等、いずれか欠陥があるものを不合
格（×で表示）とした。ガラスの成分組成を表１に、上
記各測定結果を表２に示す。As evaluation criteria, those having a surface roughness of 2 nm or less according to the stylus method and having no wrinkles or cracks were accepted (indicated by ○), those having a surface roughness of 2 nm or more or wrinkles. Those having any defects such as cracks were rejected (indicated by X). Table 1 shows the component composition of the glass, and Table 2 shows the results of the above measurements.
【００４４】[0044]
【表１】 [Table 1]
【００４５】[0045]
【表２】 〔結果〕試料NO.１〜13の実施例範囲において、ガラス
の熱特性、成形性、イオン交換ガラスの曲げ強度、耐水
性（重量減少量）のいずれについても良好であり、試料
NO.14〜18においては、上記いずれか、または複数の項
目において劣る。[Table 2] [Results] In the range of Examples of Samples Nos. 1 to 13, the thermal properties of glass, moldability, bending strength of ion exchange glass, and water resistance (weight loss) were all good.
In Nos. 14 to 18, one or more of the above items are inferior.
【００４６】[0046]
【発明の効果】本発明においては、ガラスを容易に溶融
でき、プレス成形が容易でプレス型に倣った精緻な面を
形成でき、かつプレス成形型とも熱膨張係数を近似させ
ることができて型くずれし難く、更にアルカリイオン交
換によるいわゆる化学強化度合いの高いガラスであり、
特に磁気記録媒体などとして好適に採用し得る情報記録
媒体用基板ガラスである。According to the present invention, the glass can be easily melted, the press forming is easy, a precise surface following the press mold can be formed, and the thermal expansion coefficient of both the press mold and the mold can be approximated. It is difficult to perform, and it is a glass with a high degree of so-called chemical strengthening by alkali ion exchange,
In particular, it is a substrate glass for an information recording medium that can be suitably used as a magnetic recording medium or the like.
フロントページの続き Ｆターム(参考） 4G059 AA09 AA11 AB03 AB14 AC16 AC18 HB03 HB13 HB14 HB15 4G062 AA04 BB01 DA06 DB04 DC01 DD01 DE01 DF01 EA03 EB04 EC01 EC02 EC03 ED01 ED02 ED03 EE01 EE02 EE03 EF01 EF02 EF03 EG03 FA01 FB01 FB02 FB03 FC03 FD01 FE01 FF01 FG01 FH01 FJ01 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 MM02 MM27 NN29 NN33 NN34 5D006 CB04 CB07 DA03 EA03 Continued on the front page F-term (reference) 4G059 AA09 AA11 AB03 AB14 AC16 AC18 HB03 HB13 HB14 HB15 4G062 AA04 BB01 DA06 DB04 DC01 DD01 DE01 DF01 EA03 EB04 EC01 EC02 EC03 ED01 ED02 ED03 EE01 FE03 EF03 EF03 EF03 FB02 FE01 FF01 FG01 FH01 FJ01 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 NN07 NN03 NN03 NN10
Claims (4)
該成形物をアルカリイオン交換によるところの化学強化
を施すための前記プレス成形体を得るためのガラスにお
いて、ガラスの成分組成が、wt％で、SiO2 58〜65、Al
2O3 10〜15、Li2O ４〜６、Na2O 10〜13、K2O ０〜
３、MgO ０〜４、CaO ０〜４、SrO ０〜２、BaO １〜1
0、TiO2 ０〜５、ZrO2 １〜５の範囲であることを特徴
とするプレス成形用ガラス。1. A glass for press-molding a glass in a heat-softened state, and further for obtaining said press-formed body for subjecting said molded product to chemical strengthening by alkali ion exchange, wherein the glass has a composition of wt. percent, SiO 2 58~65, Al
2 O 3 10-15, Li 2 O 4-6, Na 2 O 10-13, K 2 O 0
3, MgO 0-4, CaO 0-4, SrO 0-2, BaO 1-1
0, a glass for press molding characterized by being in the range of TiO 2 0 to 5 and ZrO 2 1 to 5.
下、104ポイズ相当温度が1000℃以下、軟化点が700℃以
下であることを特徴とする請求項１記載のプレス成形用
ガラス。2. The glass for press molding according to claim 1, wherein the glass has a temperature equivalent to 10 2 poises of 1450 ° C. or less, a temperature equivalent to 10 4 poises of 1000 ° C. or less, and a softening point of 700 ° C. or less.
であることを特徴とする請求項１または２記載のプレス
成形用ガラス。3. The glass for press molding according to claim 1, wherein a temperature corresponding to 10 10 poises of the glass is 600 ° C. or less.
ガラスを、その軟化点以下の温度でプレス成形し、更に
該成形物をカリウム塩を含む溶融塩中でアルカリイオン
交換し、化学強化を施したことを特徴とする情報記録媒
体用基板ガラス。4. The glass for press molding according to claim 1, 2 or 3, which is press-molded at a temperature not higher than its softening point, and further, the molded product is subjected to alkali ion exchange in a molten salt containing a potassium salt. A substrate glass for an information recording medium, which is reinforced.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08080999A JP3573649B2 (en) | 1999-03-25 | 1999-03-25 | Press molding glass and substrate glass for information recording media |
| EP00106462A EP1038845B1 (en) | 1999-03-25 | 2000-03-24 | Glass composition, ion exchange strengthened glass article produced from same and process for its production |
| DE60006176T DE60006176T2 (en) | 1999-03-25 | 2000-03-24 | Glass composition, glass object reinforced by ion exchange and process for its manufacture |
| US09/533,818 US6436859B1 (en) | 1999-03-25 | 2000-03-24 | Glass composition and ion exchange strengthened glass article produced from same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08080999A JP3573649B2 (en) | 1999-03-25 | 1999-03-25 | Press molding glass and substrate glass for information recording media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000272931A true JP2000272931A (en) | 2000-10-03 |
| JP3573649B2 JP3573649B2 (en) | 2004-10-06 |
Family
ID=13728809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| JP08080999A Expired - Fee Related JP3573649B2 (en) | 1999-03-25 | 1999-03-25 | Press molding glass and substrate glass for information recording media |
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