JP2004359504A - Chemically tempered glass and its manufacturing method - Google Patents
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【０００１】
【発明の属する技術分野】
本発明は、化学強化ガラス、特にタッチパネル等に使用される電子材料分野、自動車用および建築用などの分野に有用な化学強化ガラス及びその製造方法に関する。
【０００２】
【従来の技術】
省資源・省エネルギーの観点あるいは社会的なニーズの変化から、強化ガラスの薄板化や強化度アップが進んでいる。一般的に用いられている風冷強化法では、３ｍｍ以下、特に２ｍｍ以下の板厚をもったガラスの生産が難しいことから、２ｍｍ以下のガラスでは、化学強化法が多く用いられている。また、化学強化ガラスは一般的に風冷法による強化ガラスよりも高い強度を得ることができるというメリットもある。
【０００３】
化学強化ガラスの製造方法としては、種々の方法が考えられている。例えば、小さなイオン半径の原子を大きなイオン半径の原子に置き換える方法、ガラスの粘性流動を利用して大きなイオン半径の原子を小さなイオン半径の原子に置き換える方法、熱膨張率の差を利用する方法、結晶を晶出させる方法、上述の方法を組み合わせる方法など、多くの方法がある。
【０００４】
一般に、ソーダ・ライム系ガラスでは小さなイオン半径の原子を大きなイオン半径の原子に置き換える方法が数多く用いられ、その中でも、多くの化学強化ガラスは化学強化処理槽中に浸漬する、いわゆる浸漬法で製造されている。すなわち、ガラスを高温の化学強化処理液、例えば硝酸カリウム溶液中に浸積し、ガラス中のナトリウムイオンを硝酸カリウム中のカリウムイオンと置換することにより、表層に圧縮応力層を形成する。また、ガラス中にリチウムを含む場合の化学強化処理液としては、硝酸ナトリウム、または硝酸ナトリウムと硝酸カリウムの混合塩が多用される。
【０００５】
化学強化ガラスが市場に多く受け入れられている理由として、前述した薄板ガラスでの強化性や高強度化に加え、強化ガラスでも切断可能であることがあげられる。風冷強化ガラスでは、切断しようとしてクラックを導入すると、粉々割れてしまうので、切断はできない。
【０００６】
公知技術をみれば、例えば、切断したガラスを化学強化として使用することが（例えば、特許文献１参照）が、切断条件の重要な因子である表面応力の測定技術（例えば、特許文献２参照）が開示されている。また、ハードディスクドライブの化学強化に関する工程
１）予備加熱槽での予備加熱（０．５〜２時間程度かけて３８０〜５００℃に昇温）
２）硝酸カリウム又は硝酸ナトリウムの溶融塩溶液での化学強化処理（０．５〜６時間程度）
３）送風冷却槽での冷却（５〜２５ｍ３／分の冷却風で面内温度差が５℃以内で溶融塩溶液の融点以下たる室温まで強制冷却）
が詳細に述べられている例（例えば、特許文献３参照）もある。さらには、２つの処理槽を使って着色と化学強化の両方を行う方法が開示（例えば、特許文献４参照）されている。
【０００７】
【特許文献１】
特開２００２−１６０９３２号公報
【特許文献２】
特公昭５９−３７４５１号公報
【特許文献３】
特開２０００−３４４５５０号公報
【特許文献４】
特開昭４６−１３２９号公報
【０００８】
【発明が解決しようとする課題】
化学強化ガラスは切断可能とされている。しかし、切断可能といっても、この切断は非常に難しい技術であり、生産時の歩留低下の主因となっているし、製品となった後も切断不良による破壊の問題などが発生している。
【０００９】
例えば、タッチパネル等に使用される化学強化した薄板ガラスにおいて、大板の化学強化ガラスから複数枚採りを行うことにより生産性アップを試みている。しかし、ホイールチップ方式の切断機でスクライブするとき、分断時にスクライブ線に沿って分割されず、スクライブ線から外れて分割されるという問題が数多く生じている。このため、複数採りのメリットが当初の予定とは異なった結果となっている場合が多い。また、スクライブされた化学強化ガラスを使ったパネルが、市場に出した後に想定荷重よりも小さな値でも破壊するという問題も発生している。
【００１０】
このように、現実的には、化学強化ガラスの切断については、技術的に確立されているとは言えない状況にある。
【００１１】
すなわち、特開２００２−１６０９３２号公報の中で切断したガラスを化学強化として使用することが述べられているが、化学強化ガラスの切断方法を述べているわけではない。また、特公昭５９−３７４５１号公報の手法は表面応力の測定技術については知ることはできても、ガラスの切断につながる技術については示されていない。さらに、特開２０００−３４４５５０号公報で示された化学強化方法は、直径６０〜１００ｍｍのハードディスクドライブを化学強化する場合であり、切断性などについては述べられていない。また、特開昭４６−１３２９号公報は銀を使った着色と化学強化を２つの浴槽を使って行う方法であり、化学強化ガラスの切断性は述べられていない。
【００１２】
【課題を解決するための手段】
本発明は、イオン交換することによりガラス表層に圧縮応力層を形成させた化学強化ガラスにおいて、イオン交換のための第１段の浸漬処理後に、第１段の浸漬液温度よりも２０℃以上５０℃以下の高い温度かつ１０分間以上６０分間以下の第２の浸漬処理する化学強化ガラスの製造方法である。
【００１３】
また、上記の方法で製造された化学強化ガラスである。
【００１４】
さらにまた、製造された化学強化ガラスの表面硬度が５６０〜５９０ｋｇｆ／ｃｍ２にある上記の化学強化ガラスである。
【００１５】
さらにまた、歪点が４７０℃以上５３０℃以下のソーダ石灰ガラスをイオン交換処理する上記の化学強化ガラスである。
【００１６】
【発明の実施の形態】
本発明は、イオン交換することによりガラス表層に圧縮応力層を形成させた化学強化ガラスにおいて、イオン交換のための第１段の浸漬処理後に、第１段の浸漬液温度よりも２０℃以上５０℃以下の高い温度かつ１０分間以上６０分間以下の第２の浸漬処理する化学強化ガラスの製造方法である。第２の浸漬液温度を第１の浸漬液温度よりも２０℃以上５０℃以下の高い温度としたのは、２０℃未満であると得られる化学強化ガラスの切断性が下がり、５０℃を越える温度では得られる化学強化ガラスの強度が下がるからである。さらに、イオン交換液の劣化にもつながるという問題も発生してくる。
【００１７】
また、第２の浸漬処理の時間を１０分間以上６０分間以下としたのは、１０分未満では得られる化学強化ガラスの切断性は下がり、６０分以上では得られる化学強化ガラスの強度が下がるからである。
【００１８】
また、第１段の浸漬処理温度を４５０℃以上５１０℃以下とする必要がある。４５０℃未満では得られる化学強化ガラスの切断性を改善しにくく、製造に時間を要すため生産性が極めて悪くなるためである。５１０℃を越えると得られる化学強化ガラスの強度が小さくなるという問題が発生する。
【００１９】
さらに、上記の方法で製造された化学強化ガラスである。この化学強化ガラスは、従来の化学強化ガラスの強度とほぼ同等の強さを持ちながら、一方では良好な切断性も同時に示す特徴がある。
【００２０】
さらにまた、化学強化ガラスの表面硬度が５６０〜５９０ｋｇｆ／ｃｍ２にある化学強化ガラスである。従来の方法で製造されたソーダ石灰系化学強化ガラスの表面硬度は、５９０〜６１０ｋｇｆ／ｃｍ２にあるといわれている。しかし、本発明による化学強化ガラスは、その表面硬度が５６０〜５９０ｋｇｆ／ｃｍ２にある。
５９０ｋｇｆ／ｃｍ２を越えると、従来の化学強化ガラスと同様であり、切断性は悪く、ときには切断できない場合もある。また、切断できたとしても、希望する切断線からはずれることがあり、また表面にガラス粉が多発する傾向にある。一方、その表面硬度が５６０ｋｇｆ／ｃｍ２よりも小さな化学強化ガラスは、強度が小さい傾向にある。なお、硬度測定は市販の微小硬度計で良いが、その負荷量を小さな値、例えば５０ｇ以下とする必要がある。一般的なソーダ石灰系ガラスの硬度測定に用いられる２００〜１０００ｇの負荷は、その判断を誤る必要があるので、注意が必要である。
【００２１】
さらにまた、歪点が４７０℃以上５３０℃以下のソーダ石灰ガラスをイオン交換処理された上記の化学強化ガラスである。歪点が４７０℃よりも低いソーダ石灰ガラスは化学的耐久性や硬度が低いので、化学強化ガラスとしての実用性が大きく下がる。一方、歪点が５３０℃よりも高いソーダ石灰ガラスはガラスの切断性が下がり、化学強化性も下がる。また、ソーダ石灰ガラス以外のガラスは、生産性が悪いため高価なので、切断性と強度があっても実用性は小さい。
【００２２】
本発明の化学強化ガラスが従来の化学強化ガラスとほぼ同等の強度があり、かつ切断性もあるという特徴をもつ。これは、従来の化学強化ガラスと異なり、Ｆｉｃｋの法則のみには依存しない応力パターンになっているためである。
【００２３】
【実施例】
以下、実施例に基づき、述べる。
（実施例１）
厚さ０．７ｍｍのソーダ石灰系フロートガラスを４６０℃の硝酸カリウム溶融塩に１０時間浸漬して第１の化学強化（イオン交換）処理を行った後、５１０℃の浸漬液温度で６０分間第２のイオン交換処理を行った。その直後、５００℃に設定した冷却槽に化学強化ガラスを移動し、さらにその中で６０分間保持した。
その後は、通常に行われている冷却速度（約１０℃／ｍｉｎ）で冷却し、所定の化学強化ガラス製品を得た。なお、この化学強化ガラス製品の表面硬度は、５６５ｋｇｆ／ｃｍ２であった。
【００２４】
この化学強化ガラスを市販の超硬製ホイールチップを用い、一般の切断作業に準ずるスクライブ（負荷重量：２ｋｇ）および分断テストを行ったところ、問題なく切断することができた。
所定の化学強化ガラスを得た。
【００２５】
（実施例２）
厚さ０．５５ｍｍのソーダ石灰系フロートガラスを４７０℃の硝酸カリウム溶融塩に４時間浸漬して第１の化学強化（イオン交換）処理を行った後、５１０℃の浸漬液温度で２０分間第２のイオン交換処理を行った。その直後、５００℃に設定した冷却槽に化学強化ガラスを移動し、さらにその中で２０分間保持した。
その後は、通常に行われている冷却速度（約１０℃／ｍｉｎ）で冷却し、所定の化学強化ガラス製品を得た。なお、この化学強化ガラス製品の表面硬度は、５８０ｋｇｆ／ｃｍ２であった。
【００２６】
この化学強化ガラスを市販の超硬製ホイールチップを用い、一般の切断作業に準ずるスクライブ（負荷重量：２ｋｇ）および分断テストを行ったところ、問題なく切断することができた。
【００２７】
（実施例３）
厚さ１．１ｍｍのソーダ石灰系フロートガラスを５０５℃の硝酸カリウム溶融塩に１時間浸漬して第１の化学強化（イオン交換）処理を行った後、５２５℃の浸漬液温度で１０分間第２のイオン交換処理を行った。その直後、５００℃に設定した冷却槽に化学強化ガラスを移動し、さらにその中で３分間保持した。その後は、通常に行われている冷却速度（約１０℃／ｍｉｎ）で冷却し、所定の化学強化ガラス製品を得た。なお、この化学強化ガラス製品の表面硬度は、５８５ｋｇｆ／ｃｍ２であった。
【００２８】
この化学強化ガラスを市販の超硬製ホイールチップを用い、一般の切断作業に準ずるスクライブ（負荷重量：２ｋｇ）および分断テストを行ったところ、少しガラス上ですべるような感触があったが、最終的には問題なく切断することができた。
【００２９】
（比較例１）
厚さ０．７ｍｍのソーダ石灰系フロートガラスを４６０℃の硝酸カリウム溶融塩に１０時間浸漬して化学強化（イオン交換）処理を行なった後、すぐに冷却工程に入れて化学強化ガラスを製造した。
【００３０】
この化学強化ガラスを市販の超硬製ホイールチップを用いてスクライブし、分断するテストを行ったところ、スリップが顕著であった。そこで、切断圧を強くして検討したところ、スクライブ線から線状の多くのガラス粉が発生し、化学強化ガラス製品として使用することはできなかった。また、スクライブ線に沿って分断できない場合もあった。
【００３１】
（比較例２）
厚さ０．５５ｍｍのソーダ石灰系フロートガラスを４７０℃の硝酸カリウム溶融塩に４時間浸漬して化学強化（イオン交換）処理を行った後、すぐに冷却工程に入れて化学強化ガラス
を製造した。
【００３２】
この化学強化ガラスを市販の超硬製ホイールチップを用いてスクライブし、分断するテストを行ったところ、スリップが顕著であった。そこで、切断圧を強くして検討したところ、この化学強化ガラスは破壊してしまった。
【００３３】
（比較例３）
厚さ１．１ｍｍのアルミノホウ酸系ガラスを４６０℃の硝酸カリウム溶融塩に１０時間浸漬して化学強化（イオン交換）処理を行なった後、すぐに冷却工程に入れて化学強化ガラスを製造した。
【００３４】
この化学強化ガラスを市販の超硬製ホイールチップを用いてスクライブし、分断するテストを行ったところ、スリップが顕著であった。そこで、切断圧を強くして検討したが、この化学強化ガラスをスクライブ線に沿って切断することはできなかった。
【００３５】
以上の結果から示されるように、本発明の工程をイオン交換工程後に付加することにより、切断しやすい化学強化ガラスを得ることができた。
【００３６】
【発明の効果】
これまで、困難とされてきた化学強化ガラスの切断が安定してできるようになった。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chemically strengthened glass, particularly a chemically strengthened glass useful in the fields of electronic materials used for touch panels and the like, and for automobiles and buildings, and a method for producing the same.
[0002]
[Prior art]
From the viewpoint of resource saving and energy saving or changes in social needs, the tempered glass is becoming thinner and the degree of strengthening is increasing. Since it is difficult to produce a glass having a plate thickness of 3 mm or less, particularly 2 mm or less by a commonly used air-cooling tempering method, a chemical strengthening method is often used for glass of 2 mm or less. In addition, chemically strengthened glass also has an advantage that it can generally obtain higher strength than tempered glass formed by an air cooling method.
[0003]
Various methods have been considered as a method for producing chemically strengthened glass. For example, a method of replacing atoms with a small ionic radius with atoms of a large ionic radius, a method of replacing atoms with a large ionic radius with atoms of a small ionic radius using viscous flow of glass, a method of using a difference in thermal expansion coefficient, There are many methods, such as a method of crystallizing a crystal and a method of combining the above methods.
[0004]
Generally, soda-lime glass uses many methods to replace atoms with small ionic radius with atoms with large ionic radius. Have been. That is, the glass is immersed in a high-temperature chemical strengthening treatment solution, for example, a potassium nitrate solution, and a sodium ion in the glass is replaced with a potassium ion in potassium nitrate to form a compressive stress layer on the surface layer. Further, as the chemical strengthening treatment liquid when lithium is contained in the glass, sodium nitrate or a mixed salt of sodium nitrate and potassium nitrate is frequently used.
[0005]
The reason why chemically strengthened glass is widely accepted in the market is that, in addition to the above-mentioned strengthening and strengthening of thin glass, cutting of tempered glass is also possible. In the case of tempered glass, if a crack is introduced to cut the glass, the glass breaks into pieces, so that the glass cannot be cut.
[0006]
According to known techniques, for example, it is possible to use cut glass as chemical strengthening (for example, see Patent Document 1), but a technique for measuring surface stress, which is an important factor of cutting conditions (for example, see Patent Document 2). Is disclosed. Step 1) Chemical strengthening of the hard disk drive 1) Preheating in a preheating tank (heating to 380 to 500 ° C in about 0.5 to 2 hours)
2) Chemical strengthening treatment with a molten salt solution of potassium nitrate or sodium nitrate (about 0.5 to 6 hours)
3) Cooling in a blower cooling tank (forced cooling to room temperature below the melting point of the molten salt solution with in-plane temperature difference of 5 ° C or less with cooling air of 5 to 25 m 3 / min)
(For example, see Patent Document 3). Furthermore, a method of performing both coloring and chemical strengthening using two treatment tanks is disclosed (for example, see Patent Document 4).
[0007]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-160932 [Patent Document 2]
Japanese Patent Publication No. 59-37451 [Patent Document 3]
JP 2000-344550 A [Patent Document 4]
JP 46-1329 A
[Problems to be solved by the invention]
Chemically tempered glass is severable. However, even if it can be cut, this cutting is a very difficult technology, which is the main cause of the decrease in yield during production, and even after it becomes a product, the problem of destruction due to poor cutting has occurred. I have.
[0009]
For example, in a chemically strengthened thin glass used for a touch panel or the like, an attempt is made to increase productivity by taking a plurality of large chemically strengthened glass sheets. However, when scribing with a wheel tip type cutting machine, there are many problems that the cutting is not performed along the scribe line at the time of cutting, but is separated from the scribe line. For this reason, the merit of multiple sampling is often different from the initial plan. In addition, there is also a problem that a panel using scribed chemically strengthened glass breaks even if it is smaller than an assumed load after being put on the market.
[0010]
Thus, in reality, the cutting of chemically strengthened glass is not in a technically established state.
[0011]
That is, Japanese Patent Application Laid-Open No. 2002-160932 describes using cut glass as chemical strengthening, but does not describe a method of cutting chemically strengthened glass. Further, although the technique disclosed in Japanese Patent Publication No. 59-37451 can know the technique for measuring the surface stress, it does not disclose the technique that leads to the cutting of glass. Furthermore, the chemical strengthening method disclosed in Japanese Patent Application Laid-Open No. 2000-344550 is for chemically strengthening a hard disk drive having a diameter of 60 to 100 mm, and does not describe cutting properties and the like. Japanese Patent Application Laid-Open No. 46-1329 discloses a method in which coloring using silver and chemical strengthening are performed using two bathtubs, and the cuttability of chemically strengthened glass is not described.
[0012]
[Means for Solving the Problems]
The present invention relates to a chemically strengthened glass in which a compression stress layer is formed on a glass surface layer by ion exchange, after the first immersion treatment for ion exchange, the temperature of the first immersion liquid is higher by 20 ° C. or more than 50 ° C. This is a method for producing a chemically strengthened glass to be subjected to a second immersion treatment at a high temperature of not more than 10 ° C. and for not less than 10 minutes and not more than 60 minutes.
[0013]
Further, it is a chemically strengthened glass produced by the above method.
[0014]
Furthermore, it is the above-mentioned chemically strengthened glass in which the surface hardness of the manufactured chemically strengthened glass is 560 to 590 kgf / cm 2 .
[0015]
Still further, the above chemically strengthened glass is obtained by subjecting a soda-lime glass having a strain point of 470 ° C. to 530 ° C. to an ion exchange treatment.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention relates to a chemically strengthened glass in which a compression stress layer is formed on a glass surface layer by ion exchange, after the first immersion treatment for ion exchange, the temperature of the first immersion liquid is higher by 20 ° C. or more than 50 ° C. This is a method for producing a chemically strengthened glass to be subjected to a second immersion treatment at a high temperature of not more than 10 ° C. and for not less than 10 minutes and not more than 60 minutes. The reason why the temperature of the second immersion liquid is set to a temperature higher than the temperature of the first immersion liquid by 20 ° C. or more and 50 ° C. or less is that if the temperature is lower than 20 ° C., the cutability of the obtained chemically strengthened glass decreases and exceeds 50 ° C. This is because the strength of the obtained chemically strengthened glass decreases at a temperature. Further, there is a problem that the ion exchange liquid is deteriorated.
[0017]
In addition, the reason why the time of the second immersion treatment is set to 10 minutes or more and 60 minutes or less is that the cutability of the obtained chemically strengthened glass is reduced when the time is less than 10 minutes, and the strength of the obtained chemically strengthened glass is reduced when the time is 60 minutes or more. It is.
[0018]
In addition, the first stage immersion treatment temperature needs to be 450 ° C. or more and 510 ° C. or less. If the temperature is lower than 450 ° C., it is difficult to improve the cuttability of the obtained chemically strengthened glass, and it takes a long time for the production, so that the productivity becomes extremely poor. If the temperature exceeds 510 ° C., there arises a problem that the strength of the obtained chemically strengthened glass decreases.
[0019]
Further, it is a chemically strengthened glass produced by the above method. This chemically strengthened glass has a feature that it has almost the same strength as that of the conventional chemically strengthened glass, but also exhibits good cutting properties.
[0020]
Furthermore, the chemically strengthened glass has a surface hardness of 560 to 590 kgf / cm 2 . It is said that the surface hardness of the soda-lime-based chemically strengthened glass manufactured by the conventional method is in the range of 590 to 610 kgf / cm 2 . However, the chemically strengthened glass according to the present invention has a surface hardness of 560 to 590 kgf / cm 2 .
If it exceeds 590 kgf / cm 2 , it is the same as the conventional chemically strengthened glass, the cutting property is poor, and sometimes it cannot be cut. Even if the cutting is performed, the cutting line may deviate from a desired cutting line, and glass powder tends to be frequently generated on the surface. On the other hand, chemically strengthened glass whose surface hardness is smaller than 560 kgf / cm 2 tends to have low strength. The hardness may be measured with a commercially available microhardness meter, but the load must be small, for example, 50 g or less. It is necessary to pay attention to the load of 200 to 1000 g used for measuring the hardness of general soda-lime glass because it is necessary to make a mistake in the determination.
[0021]
Furthermore, the above-mentioned chemically strengthened glass is obtained by subjecting a soda-lime glass having a strain point of 470 ° C. to 530 ° C. to an ion exchange treatment. Soda-lime glass having a strain point lower than 470 ° C. has low chemical durability and hardness, so that its practicality as chemically strengthened glass is greatly reduced. On the other hand, soda-lime glass having a strain point higher than 530 ° C. decreases the cuttability of the glass and the chemical strengthening property. In addition, glass other than soda-lime glass is expensive because of poor productivity, so that its practicality is small even if it has cutability and strength.
[0022]
The chemically strengthened glass of the present invention is characterized in that it has almost the same strength as conventional chemically strengthened glass, and also has cutting properties. This is because, unlike conventional chemically strengthened glass, the stress pattern does not depend only on Fick's law.
[0023]
【Example】
Hereinafter, description will be given based on examples.
(Example 1)
A first chemical strengthening (ion exchange) treatment is performed by immersing a 0.7 mm thick soda-lime-based float glass in a potassium nitrate molten salt at 460 ° C. for 10 hours, followed by a second immersion liquid temperature of 510 ° C. for 60 minutes. Was subjected to an ion exchange treatment. Immediately after that, the chemically strengthened glass was moved to a cooling bath set at 500 ° C., and further kept therein for 60 minutes.
Thereafter, cooling was carried out at a usual cooling rate (about 10 ° C./min) to obtain a predetermined chemically strengthened glass product. In addition, the surface hardness of this chemically strengthened glass product was 565 kgf / cm 2 .
[0024]
The chemically strengthened glass was subjected to a scribe (loading weight: 2 kg) and a cutting test according to a general cutting operation using a commercially available carbide wheel tip, and as a result, the glass could be cut without any problem.
A predetermined chemically strengthened glass was obtained.
[0025]
(Example 2)
A 0.55 mm thick soda-lime-based float glass is immersed in a potassium nitrate molten salt at 470 ° C. for 4 hours to perform a first chemical strengthening (ion exchange) treatment, and then a second immersion liquid temperature of 510 ° C. for 20 minutes. Was subjected to an ion exchange treatment. Immediately after that, the chemically strengthened glass was moved to a cooling bath set at 500 ° C., and was further kept therein for 20 minutes.
Thereafter, cooling was carried out at a usual cooling rate (about 10 ° C./min) to obtain a predetermined chemically strengthened glass product. In addition, the surface hardness of this chemically strengthened glass product was 580 kgf / cm 2 .
[0026]
The chemically strengthened glass was subjected to a scribe (loading weight: 2 kg) and a cutting test according to a general cutting operation using a commercially available carbide wheel tip, and as a result, the glass could be cut without any problem.
[0027]
(Example 3)
A 1.1 mm thick soda-lime float glass is immersed in a molten salt of potassium nitrate at 505 ° C. for 1 hour to perform a first chemical strengthening (ion exchange) treatment, and then a second immersion liquid temperature of 525 ° C. for 10 minutes. Was subjected to an ion exchange treatment. Immediately after that, the chemically strengthened glass was moved to a cooling bath set at 500 ° C., and further kept therein for 3 minutes. Thereafter, cooling was carried out at a usual cooling rate (about 10 ° C./min) to obtain a predetermined chemically strengthened glass product. In addition, the surface hardness of this chemically strengthened glass product was 585 kgf / cm 2 .
[0028]
Using a commercially available carbide wheel tip, this chemically strengthened glass was subjected to a scribe (loading weight: 2 kg) and a cutting test in accordance with ordinary cutting work. Was cut without any problem.
[0029]
(Comparative Example 1)
After soda-lime-based float glass having a thickness of 0.7 mm was immersed in a potassium nitrate molten salt at 460 ° C. for 10 hours to perform a chemical strengthening (ion exchange) treatment, it was immediately put into a cooling step to produce a chemically strengthened glass.
[0030]
When this chemically strengthened glass was scribed using a commercially available carbide wheel tip and subjected to a cutting test, slip was remarkable. Then, when the cutting pressure was increased and examined, a large amount of linear glass powder was generated from the scribe line, and it could not be used as a chemically strengthened glass product. In some cases, it was not possible to cut along the scribe line.
[0031]
(Comparative Example 2)
A soda-lime-based float glass having a thickness of 0.55 mm was immersed in a potassium nitrate molten salt at 470 ° C. for 4 hours to perform a chemical strengthening (ion exchange) treatment, and then immediately entered a cooling step to produce a chemically strengthened glass.
[0032]
When this chemically strengthened glass was scribed using a commercially available carbide wheel tip and subjected to a cutting test, slip was remarkable. Therefore, when the cutting pressure was increased, the chemically strengthened glass was broken.
[0033]
(Comparative Example 3)
A 1.1 mm thick aluminoborate glass was immersed in a potassium nitrate molten salt at 460 ° C. for 10 hours to perform a chemical strengthening (ion exchange) treatment, and then immediately entered a cooling step to produce a chemically strengthened glass.
[0034]
When this chemically strengthened glass was scribed using a commercially available carbide wheel tip and subjected to a cutting test, slip was remarkable. Therefore, although the cutting pressure was increased, the chemically strengthened glass could not be cut along the scribe line.
[0035]
As shown from the above results, by adding the step of the present invention after the ion exchange step, a chemically strengthened glass that can be easily cut was obtained.
[0036]
【The invention's effect】
It has become possible to stably cut chemically strengthened glass, which has been considered difficult so far.
Claims (5)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003160672A JP4289931B2 (en) | 2003-06-05 | 2003-06-05 | Method for producing chemically strengthened glass |
| PCT/JP2004/007103 WO2004106253A1 (en) | 2003-05-28 | 2004-05-25 | Chemically reinforced glass and method for production thereof |
| KR1020057013832A KR100792771B1 (en) | 2003-05-28 | 2004-05-25 | Chemically reinforced glass and method for production thereof |
| TW093115363A TWI276615B (en) | 2003-05-28 | 2004-05-28 | Chemically reinforced glass and method for production thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2003160672A JP4289931B2 (en) | 2003-06-05 | 2003-06-05 | Method for producing chemically strengthened glass |
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| JP2004359504A true JP2004359504A (en) | 2004-12-24 |
| JP4289931B2 JP4289931B2 (en) | 2009-07-01 |
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| JP2003160672A Expired - Fee Related JP4289931B2 (en) | 2003-05-28 | 2003-06-05 | Method for producing chemically strengthened glass |
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