JP3804159B2 - Glass substrate and glass substrate for PDP - Google Patents
Glass substrate and glass substrate for PDP Download PDFInfo
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- JP3804159B2 JP3804159B2 JP6114097A JP6114097A JP3804159B2 JP 3804159 B2 JP3804159 B2 JP 3804159B2 JP 6114097 A JP6114097 A JP 6114097A JP 6114097 A JP6114097 A JP 6114097A JP 3804159 B2 JP3804159 B2 JP 3804159B2
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Classifications
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- 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
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
- C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
Description
【０００１】
【発明の属する技術分野】
本発明は、フラットディスプレイ、特にプラズマディスプレイパネル（ＰＤＰ）に用いるガラス基板に関する。
【０００２】
【従来の技術】
ＰＤＰは一般的に、基板ガラス上に金属電極、絶縁ペースト、リブペースト等を５５０〜６００℃程度の最高温度で焼成後、対向板と周囲をフリットシールすることにより製造される。従来、このための基板ガラスとして建築用または自動車用として広く用いられるソーダライムガラスが一般的に用いられてきた。
【０００３】
しかし、ソーダライムガラスのガラス転移点は５３０〜５６０℃であるため、上記の最高温度で熱処理を受けると基板ガラスが変形または収縮を起こし、寸法が著しく変化する。したがって、対向板との電極位置合わせを精度よく実現しがたいという課題があった。特に、生産性の高いベルト炉のような連続式の焼成炉を使用して製造を行う場合、焼成中にガラス板の先端と後端で温度差がつき、ガラス板が前後に非対称な寸法変化を起こすという問題があった。
【０００４】
このガラス基板の熱変形または熱収縮の問題を解決するため、熱膨張係数がソーダライムガラスと近く、ガラス転移点、歪点が高いガラスが知られている（特開平３−４０９３３、特開平７−２５７９３７）。このようなガラスを用いると、連続式の焼成炉でＰＤＰ製造の熱処理を行っても、ソーダライムガラスで問題となるような前後に非対称な寸法変化を起こしにくいため、高い精度でパネルを焼成しうる。
【０００５】
【発明が解決しようとする課題】
しかし、近年のＰＤＰの大型化により、製造工程でのハンドリングがますます困難になってきている。特に、大型基板は自重により大きな曲げ応力を受けることが多いため、わずかな傷の存在が製造工程での割れにつながる問題がある。
また、すでに提案されている組成はいずれも比重が２．６を超え、部材の軽量化が困難である問題もある。
【０００６】
本発明の目的は上記欠点を解決し、高いガラス転移点を有し、かつ５０〜３５０℃の平均熱膨張係数がソーダライムガラスと同等であるとともに、傷がつきにくく製造工程で割れにくいガラス基板を提供することにある。
【０００７】
【課題を解決するための手段】
本発明は、実質的に重量％で、
ＳｉＯ2 ５６〜７２、
Ａｌ2 Ｏ3 １〜１４未満、
ＭｇＯ ０〜 ９、
ＣａＯ ０．５〜１１、
ＳｒＯ ０〜 ４、
ＢａＯ ０〜 ３、
ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯ ６〜１４未満、
Ｎａ2 Ｏ ０〜 ９、
Ｋ2 Ｏ ６〜２０、
Ｎａ2 Ｏ＋Ｋ2 Ｏ ６〜２０、
からなり、比重が２．６未満であり、５０〜３５０℃の平均熱膨張係数が７５×１０ -7 〜９０×１０ -7 ／℃であるガラス基板である。また、これらガラス基板からなるプラズマディスプレイ用ガラス基板である。
【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。
ＳｉＯ2 はガラスの骨格をなす成分である。含有量が５６重量％（以下単に％と表記する）未満では耐熱性が劣り、また傷つきやすくなる。好ましくは６０％以上である。他方、７２％超では熱膨張係数が小さくなりすぎる。好ましくは７０％以下である。
【０００９】
Ａｌ2 Ｏ3 はガラス転移点を上げ、耐熱性を向上させるため１％以上添加される。好ましくは２％以上である。他方、１４％以上ではガラスの熔解性が低下する傾向がある。好ましくは１０％以下、特に好ましくは８％以下である。
【００１０】
ＭｇＯは必須ではないが、ガラスの熔解時の粘性を下げ、熔解を促進するため添加できる。その効果を確実にするためには１％以上、特に３％以上含有することが好ましい。他方、含有量が９％超では、熱膨張係数が大きくなり、失透温度が高くなり、かつ傷つきやすくなる傾向がある。好ましくは６％以下である。
【００１１】
ＣａＯはガラスの熔解時の粘性を下げ、熔解を促進するため０．５％以上添加される。２％以上、特に３％以上含有することが好ましい。他方、含有量が１１％超では、熱膨張係数が大きくなり、失透温度が高くなり、かつ傷つきやすくなる傾向がある。好ましくは９％以下、特に好ましくは８％以下である。
【００１２】
ＳｒＯは必須成分ではないが、ガラスの熔解時の粘性を下げ、熔解を促進する効果があるので添加できる。他方、４％超では傷つきやすくなるおそれがある。好ましくは２％以下、特に好ましくは１％以下である。
【００１３】
ＢａＯは必須成分ではないが、ガラスの熔解時の粘性を下げ、熔解を促進する効果があるので添加できる。他方、３％超では傷つきやすくなるおそれがある。好ましくは２％以下、特に好ましくは１％以下である。
【００１４】
ＭｇＯ、ＣａＯ、ＳｒＯ、ＢａＯの合量は、ガラスの熔解時の粘性を下げ、熔解しやすくするため６％以上含有される。８％以上含有することが好ましい。他方、１４％以上ではガラスが傷つきやすくなり、また失透温度が高くなる傾向がある。好ましくは１３％以下である。
【００１５】
Ｎａ2 Ｏは必須成分ではないが、ガラスの熔解時の粘性を下げ、熔解を促進する効果があるため含有しうる。効果を確実にするためには１％以上含有することが好ましい。他方、９％超では熱膨張係数が大きくなりすぎ、また、化学的耐久性が低下し、電気抵抗が小さくなるおそれがある。好ましくは６％以下、より好ましくは４％以下、特に好ましくは３％以下である。
【００１６】
Ｋ2 ＯはＮａ2 Ｏと同様の効果があるので６％以上含有される。好ましくは１０％以上、より好ましくは１２％以上である。他方、２０％超では熱膨張係数が大きくなりすぎ、化学的耐久性が低下する傾向がある。好ましくは１８％以下、特に好ましくは１６％以下である。
【００１７】
Ｎａ2 ＯとＫ2 Ｏとはガラスの熔解時の粘性を下げ、熔解しやすくするため、合量で６％以上含有される。好ましくは１０％以上、特に好ましくは１２％以上である。他方、２０％超では化学的耐久性が低下し、電気抵抗が小さくなるおそれがある。好ましくは１８％以下、特に好ましくは１６％以下である。
【００１８】
本発明によるガラスは上記成分以外にガラスの熔解性、清澄性、成形性を改善するため、Ａｓ2 Ｏ3 、Ｓｂ2 Ｏ3 、Ｐ2 Ｏ5 、Ｆ、Ｃｌを合量で２重量％以下添加できる。また、ガラスの化学的耐久性の向上のため、Ｌａ2 Ｏ3 、ＴｉＯ2 、ＳｎＯ2 を合量で５重量％以下添加できる。ここで、Ａｓ2 Ｏ3 、Ｓｂ2 Ｏ3 はリサイクルを容易にするため、Ｐ2 Ｏ5 、Ｆ、Ｃｌはガラス転移点を高く維持するため、それぞれの含有量は０．５％以下が好ましく、より好ましくは実質的に含有されない、すなわち不純物の程度を超えない。
【００１９】
さらに、Ｆｅ2 Ｏ3 、ＣｏＯ、ＮｉＯ、Ｓｅ、Ｎｄ2 Ｏ3 等の着色剤を添加してガラスの色調を調整できる。この着色剤の含有量は合量で１重量％以下が好ましい。
また、ガラス転移点を上げるため、ＺｒＯ2 を微量含有させうるが、ガラスが傷つきやすくなる傾向があるため、ＺｒＯ2 の含有量は０．５％未満とする。好ましくは、不純物の程度を超えて実質的に含有されない。
【００２０】
さらに、熔解性を向上するためにＢ2 Ｏ3 を添加できる。ただし、過度の添加は、熱膨張係数を低下させるので１．５重量％未満とすることが好ましく、より好ましくは実質的に含有されない。
また、ＺｎＯを熔解性改善のために添加してもよいが、５％以上添加すると、フロートバス内で還元されて欠点を生じるおそれがある。
さらに、Ｌｉ2 Ｏを熔解性改善のために添加してもよいが、３％以上添加するとガラス転移点が低くなるおそれがある。
【００２１】
かくして得られるガラスのガラス転移点は好ましくは６００℃以上、より好ましくは６２５℃以上である。また、本発明で得られるガラスの熱膨張係数は好ましくは７５×１０-7〜９０×１０-7／℃の範囲、より好ましくは８０×１０-7〜９０×１０-7／℃の範囲にある。
【００２２】
特に、本発明にかかるガラスは脆さ指標値が７４００ｍ-1/2以下であることが好ましく、より好ましくは７３００ｍ-1/2以下である。
なお、本発明において、ガラスの脆さ指標値としてはローンらによって提案された脆さ指標値Ｂを使用する（B.R.Lawn and D.B.Marshall,J.Am. Ceram.Soc.,62［7-8］347-350(1979) ）。ここで、脆さ指標値Ｂは材料のビッカース硬さＨV と破壊靭性値ＫC から式（１）により定義される。
Ｂ＝ＨV ／ＫC （１）
【００２３】
また、本発明のガラスは比重が２．６未満であることが好ましく、より好ましくは２．５５以下、特に好ましくは２．５以下である。
【００２４】
本発明によるガラスは、ＰＤＰ用基板として好適である。その分光透過率は４２５〜４７５ｎｍ、５１０〜５６０ｎｍ、６００〜６５０ｎｍの範囲でそれぞれ８５％以上となっていることが好ましい。これらの波長範囲での発光が効率的に表示に利用できるからである。
【００２５】
本発明のガラス基板は、例えば次のような方法で製造できる。すなわち、通常使用される各成分の原料を目標成分になるように調合し、これを熔解炉に連続的に投入し、１５００〜１６００℃に加熱して熔融する。この熔融ガラスをフロート法により所定の板厚に成形し、徐冷後切断することによって、透明なガラス基板を得る。
【００２６】
【実施例】
表１〜表３に本発明に関する実験例を示す。
各成分の原料を目標組成になるように調合し、白金るつぼを用いて１５５０〜１６５０℃に加熱し４〜５時間かけて熔融した。熔解にあたっては、白金スターラを挿入し２時間撹拌してガラスの均質化を行った。こうして得られたガラスについて、ガラスの脆さ指標値Ｂ、ガラス転移点Ｔg 、熱膨張係数α、比重ρを測定し、表１〜表３にガラス組成とともに示した。なお、例１〜例１２は実施例であり、例１３〜例１８は比較例である。
本実験例で、各物性は以下のように測定する。
【００２７】
脆さ指標値Ｂ（単位：ｍ-1/2）：
脆さの指標をガラスに適用する際の大きな問題は破壊靭性値ＫC が正確に評価しにくいことである。しかし、本発明者はいくつかの手法を検討した結果、ビッカース圧子を押し込んだときにガラス表面に残る圧子の痕の大きさと痕の四隅から発生するクラックの長さとの関係から脆さを定量的に評価できることを見いだしている。その関係は式（２）により定義される。ここで、Ｐはビッカース圧子の押し込み荷重であり、ａ、ｃはそれぞれ、ビッカース圧痕の対角長および四隅から発生するクラックの長さ（圧子の痕を含む対称な２つのクラックの全長）である。
ｃ／ａ＝０．００５６Ｂ2/3 Ｐ1/6 （２）
各種ガラスの表面に打ち込んだビッカース圧痕の寸法と式（２）を用いて、脆さ指標値を評価する。
【００２８】
熱膨張係数α（単位：×１０-7／℃）：
示差熱膨張計を用いて、石英ガラスを参照試料として室温から５℃／分の割合で昇温した際のガラスの伸び率を測定する。測定はガラスが軟化してもはや伸びが観測されなくなる温度（屈伏点）まで行い、５０〜３５０℃の平均の熱膨張係数を算出した。
【００２９】
ガラス転移点Ｔg （単位：℃）：
熱膨張曲線における屈曲点をガラス転移点とした。
【００３０】
比重ρ：
泡を含まない約２０ｇのガラス塊をアルキメデス法によって測定する。
【００３１】
表より明らかなように、本発明によるガラス基板の脆さ指標値は、７４００ｍ-1/2以下であり、傷がつきにくい。熱膨張係数は８０〜９０×１０-7／℃の範囲にあり、従来ＰＤＰ用基板として用いられていたソーダライムガラスと同程度であるため、同種のフリット材料を採用できる。また、ガラス転移点はいずれも６００℃以上であり、大型ＰＤＰの製造において、ガラスが変形したり収縮する等の問題が少ない。比重は２．６未満であり、部材の軽量化が容易である。
【００３２】
一方、例１３はガラス転移点Ｔg が５５０℃であるため、ＰＤＰ製造工程でのガラスの熱変形が問題となる。例１４〜１８は脆さ指標値が７４００ｍ-1/2を超えるので、傷がつきやすく、製造工程中での割れ確率が大きい。また、例１４〜１８のガラス基板は比重が２．６以上であるので、部材の軽量化が困難である。
【００３３】
【表１】
【表２】
【表３】
【発明の効果】
本発明によるガラスは、傷がつきにくく、耐熱性が高く、かつソーダライムガラスと同等の熱膨張係数を有するので、ＰＤＰ用基板等、かかる特性を要求する用途に好適である。また、比重が小さいので、部材の軽量化が容易である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a glass substrate used for a flat display, particularly a plasma display panel (PDP).
[0002]
[Prior art]
A PDP is generally manufactured by baking a metal electrode, an insulating paste, a rib paste, or the like on a substrate glass at a maximum temperature of about 550 to 600 ° C., and then frit-sealing the counter plate and the periphery. Conventionally, soda lime glass, which is widely used for construction or automobiles, has been generally used as a substrate glass for this purpose.
[0003]
However, since the glass transition point of soda lime glass is 530 to 560 ° C., when subjected to the heat treatment at the above-mentioned maximum temperature, the substrate glass is deformed or contracted, and the dimensions are remarkably changed. Accordingly, there has been a problem that it is difficult to accurately achieve electrode alignment with the counter plate. In particular, when manufacturing using a continuous firing furnace such as a belt furnace with high productivity, there is a temperature difference between the front and rear ends of the glass plate during firing, and the glass plate is asymmetrically dimensionally changed back and forth. There was a problem of waking up.
[0004]
In order to solve the problem of thermal deformation or thermal contraction of the glass substrate, a glass having a thermal expansion coefficient close to that of soda lime glass and having a high glass transition point and strain point is known (Japanese Patent Laid-Open Nos. 3-40933 and 7). -257937). When such glass is used, even if heat treatment for PDP production is carried out in a continuous firing furnace, it is difficult to cause asymmetrical dimensional changes before and after that would cause problems with soda lime glass. sell.
[0005]
[Problems to be solved by the invention]
However, with the recent increase in size of PDPs, handling in the manufacturing process has become increasingly difficult. In particular, since a large substrate is often subjected to a large bending stress due to its own weight, there is a problem that the presence of a slight scratch leads to a crack in the manufacturing process.
Also, already exceeded even gravity Any composition proposed 2.6 is also lightweight difficult der Ru problems of members.
[0006]
An object of the present invention is to solve the above drawbacks, a high having a glass transition point, and with an average thermal expansion coefficient of 50 to 350 ° C. is equivalent to soda lime glass, hard glass substrate cracks in scratch per difficult manufacturing process Is to provide.
[0007]
[Means for Solving the Problems]
The present invention is substantially in weight percent,
SiO 2 56-72,
Al 2 O 3 less than 1-14,
MgO 0-9,
CaO 0.5-11,
SrO 0-4,
BaO 0-3,
MgO + CaO + SrO + BaO less than 6-14,
Na 2 O 0-9,
K 2 O 6-20,
Na 2 O + K 2 O 6-20,
Tona is, a specific gravity of less than 2.6, a glass substrate average thermal expansion coefficient of Ru 75 × 10 -7 ~90 × 10 -7 / ℃ der of 50 to 350 ° C.. Moreover, it is a glass substrate for plasma displays which consists of these glass substrates.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The reasons for limiting the composition in the present invention are as follows.
SiO 2 is a component forming a glass skeleton. When the content is less than 56% by weight (hereinafter simply referred to as “%”), the heat resistance is inferior and the film is easily damaged. Preferably it is 60% or more. On the other hand, if it exceeds 72%, the thermal expansion coefficient becomes too small. Preferably it is 70% or less.
[0009]
Al 2 O 3 is added in an amount of 1% or more in order to increase the glass transition point and improve the heat resistance. Preferably it is 2% or more. On the other hand, if it is 14% or more, the meltability of the glass tends to decrease. Preferably it is 10% or less, Most preferably, it is 8% or less.
[0010]
MgO is not essential, but it can be added to lower the viscosity during melting of the glass and promote melting. In order to ensure the effect, it is preferable to contain 1% or more, particularly 3% or more. On the other hand, if the content exceeds 9%, the coefficient of thermal expansion becomes large, the devitrification temperature tends to be high, and it tends to be easily damaged. Preferably it is 6% or less.
[0011]
CaO is added in an amount of 0.5% or more in order to lower the viscosity of the glass during melting and to promote melting. It is preferable to contain 2% or more, particularly 3% or more. On the other hand, if the content exceeds 11%, the coefficient of thermal expansion becomes large, the devitrification temperature tends to be high, and it tends to be easily damaged. Preferably it is 9% or less, Most preferably, it is 8% or less.
[0012]
Although SrO is not an essential component, it can be added because it has the effect of lowering the viscosity during melting of glass and promoting melting. On the other hand, if it exceeds 4%, it may be easily damaged. Preferably it is 2% or less, particularly preferably 1% or less.
[0013]
BaO is not an essential component, but it can be added because it has the effect of lowering the viscosity during glass melting and promoting melting. On the other hand, if it exceeds 3%, it tends to be easily damaged. Preferably it is 2% or less, particularly preferably 1% or less.
[0014]
The total amount of MgO, CaO, SrO, and BaO is contained in an amount of 6% or more in order to lower the viscosity during melting of the glass and facilitate melting. It is preferable to contain 8% or more. On the other hand, if it is 14% or more, the glass tends to be damaged, and the devitrification temperature tends to increase. Preferably it is 13% or less.
[0015]
Na 2 O is not an essential component, but may be contained because it has an effect of reducing the viscosity during melting of glass and promoting melting. In order to ensure the effect, it is preferable to contain 1% or more. On the other hand, if it exceeds 9%, the thermal expansion coefficient becomes too large, the chemical durability is lowered, and the electric resistance may be reduced. Preferably it is 6% or less, More preferably, it is 4% or less, Most preferably, it is 3% or less.
[0016]
Since K 2 O has the same effect as Na 2 O, it is contained in an amount of 6% or more. Preferably it is 10% or more, More preferably, it is 12% or more. On the other hand, if it exceeds 20%, the thermal expansion coefficient becomes too large, and the chemical durability tends to decrease. Preferably it is 18% or less, particularly preferably 16% or less.
[0017]
Na 2 O and K 2 O are contained in a total amount of 6% or more in order to lower the viscosity during melting of the glass and facilitate melting. Preferably it is 10% or more, Most preferably, it is 12% or more. On the other hand, if it exceeds 20%, the chemical durability is lowered and the electric resistance may be reduced. Preferably it is 18% or less, particularly preferably 16% or less.
[0018]
In addition to the above components, the glass according to the present invention improves As 2 O 3 , Sb 2 O 3 , P 2 O 5 , F, and Cl in a total amount of 2% by weight or less in order to improve the meltability, clarity and formability of the glass. Can be added. In order to improve the chemical durability of the glass, La 2 O 3 , TiO 2 , and SnO 2 can be added in a total amount of 5% by weight or less. Here, As 2 O 3 and Sb 2 O 3 facilitate recycling, and P 2 O 5 , F, and Cl maintain a high glass transition point. Therefore, each content is preferably 0.5% or less. More preferably, it is not substantially contained, i.e. does not exceed the degree of impurities.
[0019]
Furthermore, the color tone of the glass can be adjusted by adding a colorant such as Fe 2 O 3 , CoO, NiO, Se, or Nd 2 O 3 . The total content of the colorant is preferably 1% by weight or less.
Further, although a small amount of ZrO 2 can be contained in order to increase the glass transition point, the glass tends to be easily damaged, so the ZrO 2 content is less than 0.5%. Preferably, it is not substantially contained beyond the level of impurities.
[0020]
Furthermore, B 2 O 3 can be added to improve the meltability. However, excessive addition reduces the thermal expansion coefficient, so it is preferably less than 1.5% by weight, more preferably not substantially contained.
In addition, ZnO may be added to improve the meltability, but if it is added in an amount of 5% or more, it may be reduced in the float bath to cause a defect.
Further, Li 2 O may be added to improve the meltability, but if added at 3% or more, the glass transition point may be lowered.
[0021]
The glass transition point of the glass thus obtained is preferably 600 ° C. or higher, more preferably 625 ° C. or higher. The thermal expansion coefficient of the glass obtained by the present invention is preferably in the range of 75 × 10 −7 to 90 × 10 −7 / ° C., more preferably in the range of 80 × 10 −7 to 90 × 10 −7 / ° C. is there.
[0022]
In particular, the glass according to the present invention preferably has a brittleness index value of 7400 m −1/2 or less, more preferably 7300 m −1/2 or less.
In the present invention, the brittleness index value B proposed by Lorne et al. Is used as the brittleness index value of the glass (BRLawn and DBMarshall, J. Am. Ceram. Soc., 62 [7-8] 347- 350 (1979)). Here, fragility index value B is defined from Vickers hardness H V and fracture toughness value K C of the material by the equation (1).
B = H V / K C (1)
[0023]
The glass of the present invention preferably has a specific gravity of less than 2.6, more preferably 2.55 or less, particularly preferably 2.5 or less.
[0024]
The glass according to the present invention is suitable as a substrate for PDP. The spectral transmittance is preferably 85% or more in the range of 425 to 475 nm, 510 to 560 nm, and 600 to 650 nm. This is because light emission in these wavelength ranges can be efficiently used for display.
[0025]
The glass substrate of the present invention can be produced, for example, by the following method. That is, normally used raw materials for each component are blended so as to become target components, which are continuously charged into a melting furnace and heated to 1500 to 1600 ° C. for melting. The molten glass is formed into a predetermined plate thickness by a float method, and is cooled and then cut to obtain a transparent glass substrate.
[0026]
【Example】
Tables 1 to 3 show experimental examples related to the present invention.
The raw material of each component was prepared so that it might become a target composition, it heated to 1550-1650 degreeC using the platinum crucible, and it melted | melted over 4 to 5 hours. In melting, a platinum stirrer was inserted and stirred for 2 hours to homogenize the glass. The glass thus obtained was measured for brittleness index value B, glass transition point T g , thermal expansion coefficient α, specific gravity ρ of the glass and shown in Tables 1 to 3 together with the glass composition. Examples 1 to 12 are examples, and examples 13 to 18 are comparative examples.
In this experimental example, each physical property is measured as follows.
[0027]
Brittleness index value B (unit: m −1/2 ):
A major problem in applying the brittleness index to glass is that the fracture toughness value K C is difficult to accurately evaluate. However, as a result of studying several methods, the present inventor has quantitatively determined the brittleness from the relationship between the size of the indenter mark remaining on the glass surface when the Vickers indenter is pushed in and the length of the crack generated from the four corners of the mark. I have found that I can be evaluated. The relationship is defined by equation (2). Here, P is the indentation load of the Vickers indenter, and a and c are the diagonal length of the Vickers indentation and the length of the crack generated from the four corners (the total length of two symmetrical cracks including the indenter trace), respectively. .
c / a = 0.0056B 2/3 P 1/6 (2)
The brittleness index value is evaluated by using the dimensions of Vickers indentation and formula (2) which are driven into the surfaces of various glasses.
[0028]
Thermal expansion coefficient α (unit: × 10 -7 / ° C):
A differential thermal dilatometer is used to measure the elongation of the glass when the temperature is raised from room temperature at a rate of 5 ° C./min using quartz glass as a reference sample. The measurement was performed up to a temperature (bending point) at which the glass was softened and elongation was no longer observed, and an average thermal expansion coefficient of 50 to 350 ° C. was calculated.
[0029]
Glass transition point T g (unit: ° C):
The bending point in the thermal expansion curve was taken as the glass transition point.
[0030]
Specific gravity ρ:
About 20 g of glass lump containing no foam is measured by the Archimedes method.
[0031]
As is clear from the table, the brittleness index value of the glass substrate according to the present invention is 7400 m −1/2 or less, and is hardly scratched. The thermal expansion coefficient is in the range of 80 to 90 × 10 −7 / ° C., which is similar to soda lime glass conventionally used as a substrate for PDP, so the same kind of frit material can be adopted. In addition, the glass transition point is 600 ° C. or more, and there are few problems such as deformation or shrinkage of the glass in the production of a large PDP. Specific gravity is less than 2.6, and the weight reduction of a member is easy.
[0032]
On the other hand, Example 13 for the glass transition temperature T g is 550 ° C., thermal deformation of the glass in the PDP manufacturing process is a problem. In Examples 14 to 18, since the brittleness index value exceeds 7400 m −1/2 , the sample is easily scratched and has a high probability of cracking in the manufacturing process. Moreover, since the specific gravity of the glass substrate of Examples 14-18 is 2.6 or more, the weight reduction of a member is difficult.
[0033]
[ Table 1 ]
[ Table 2 ]
[ Table 3 ]
【The invention's effect】
The glass according to the present invention is not easily scratched, has high heat resistance, and has a thermal expansion coefficient equivalent to that of soda lime glass, and thus is suitable for applications requiring such characteristics as a substrate for PDP. Further, since the specific gravity is small, it is easy to reduce the weight of the member.
Claims (5)
ＳｉＯ2 ５６〜７２、
Ａｌ2 Ｏ3 １〜１４未満、
ＭｇＯ ０〜 ９、
ＣａＯ ０．５〜１１、
ＳｒＯ ０〜 ４、
ＢａＯ ０〜 ３、
ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯ ６〜１４未満、
Ｎａ2 Ｏ ０〜 ９、
Ｋ2 Ｏ ６〜２０、
Ｎａ2 Ｏ＋Ｋ2 Ｏ ６〜２０、
からなり、比重が２．６未満であり、５０〜３５０℃の平均熱膨張係数が７５×１０ -7 〜９０×１０ -7 ／℃であるガラス基板。Substantially by weight percent,
SiO 2 56-72,
Al 2 O 3 less than 1-14,
MgO 0-9,
CaO 0.5-11,
SrO 0-4,
BaO 0-3,
MgO + CaO + SrO + BaO less than 6-14,
Na 2 O 0-9,
K 2 O 6-20,
Na 2 O + K 2 O 6-20,
Tona is, a specific gravity of less than 2.6, the average thermal expansion coefficient of 75 × 10 -7 ~90 × 10 -7 / ℃ der Ru glass substrate 50 to 350 ° C..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6114097A JP3804159B2 (en) | 1996-03-15 | 1997-03-14 | Glass substrate and glass substrate for PDP |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8-59648 | 1996-03-15 | ||
| JP5964896 | 1996-03-15 | ||
| JP6114097A JP3804159B2 (en) | 1996-03-15 | 1997-03-14 | Glass substrate and glass substrate for PDP |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09301733A JPH09301733A (en) | 1997-11-25 |
| JP3804159B2 true JP3804159B2 (en) | 2006-08-02 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| JP6114097A Expired - Fee Related JP3804159B2 (en) | 1996-03-15 | 1997-03-14 | Glass substrate and glass substrate for PDP |
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| Country | Link |
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| JP (1) | JP3804159B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102007079A (en) * | 2008-04-21 | 2011-04-06 | 旭硝子株式会社 | Glass plate for display panel, method for producing the same, and method for producing tft panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6313052B1 (en) * | 1998-02-27 | 2001-11-06 | Asahi Glass Company Ltd. | Glass for a substrate |
| JP5022532B2 (en) * | 1999-06-08 | 2012-09-12 | 旭硝子株式会社 | Substrate glass and glass substrate |
| JP2001064034A (en) * | 1999-08-24 | 2001-03-13 | Asahi Glass Co Ltd | Glass base plate for display |
| JP4071480B2 (en) * | 2001-08-31 | 2008-04-02 | 松下電器産業株式会社 | Glass composition for lamp, lamp stem and bulb using the same, and lamp using the same |
| KR20050038931A (en) * | 2003-10-23 | 2005-04-29 | 쌩-고벵 글래스 프랑스 | Silica-soda-lime glass compositions and their applications |
| DE202009018732U1 (en) | 2008-02-26 | 2012-11-27 | Corning Inc. | Refining agent for silicate glasses |
| KR101362565B1 (en) | 2008-12-25 | 2014-02-13 | 아사히 가라스 가부시키가이샤 | Glass substrate and process for producing same |
| US9637408B2 (en) * | 2009-05-29 | 2017-05-02 | Corsam Technologies Llc | Fusion formable sodium containing glass |
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| TWI564262B (en) | 2012-02-29 | 2017-01-01 | 康寧公司 | High cte potassium borosilicate core glasses and glass articles comprising the same |
-
1997
- 1997-03-14 JP JP6114097A patent/JP3804159B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102007079A (en) * | 2008-04-21 | 2011-04-06 | 旭硝子株式会社 | Glass plate for display panel, method for producing the same, and method for producing tft panel |
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| Publication number | Publication date |
|---|---|
| JPH09301733A (en) | 1997-11-25 |
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