WO2015147092A1 - 化学強化用ガラス及び化学強化ガラス並びに化学強化ガラスの製造方法 - Google Patents
化学強化用ガラス及び化学強化ガラス並びに化学強化ガラスの製造方法 Download PDFInfo
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- WO2015147092A1 WO2015147092A1 PCT/JP2015/059221 JP2015059221W WO2015147092A1 WO 2015147092 A1 WO2015147092 A1 WO 2015147092A1 JP 2015059221 W JP2015059221 W JP 2015059221W WO 2015147092 A1 WO2015147092 A1 WO 2015147092A1
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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
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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
- 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
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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
- C03C4/00—Compositions for glass with special properties
- C03C4/18—Compositions for glass with special properties for ion-sensitive glass
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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
- C03C2204/00—Glasses, glazes or enamels with special properties
Definitions
- the present invention includes a cover glass of a touch panel display and a touch sensor glass, a cover glass of a liquid crystal television and a PC monitor, a cover glass of an automobile instrument panel, etc., provided in an information device such as a tablet PC, a notebook PC, a smartphone, and an electronic book reader,
- the present invention relates to a glass for chemical strengthening suitable as a base glass of a chemically strengthened glass used for a cover glass for a solar cell, a multilayer glass used for a window of a building or a house, and the like, and a chemically strengthened glass using the glass.
- the touch panel display has a structure in which a touch sensor glass and a cover glass are stacked on a glass substrate for display.
- a touch sensor glass called OGS (One / glass / solution) and a cover glass are integrated.
- touch sensor glass, cover glass, and OGS glass are required to be thin and high in strength, and chemically strengthened glass subjected to chemical strengthening treatment by ion exchange is used.
- the strengthening characteristics of these chemically strengthened glasses are generally expressed by surface compressive stress (CS) and compressive stress depth (DOL; Depth of layer).
- CS surface compressive stress
- DOL compressive stress depth
- aluminosilicate glass having a composition that is easily ion-exchanged for strength improvement has been proposed.
- CS becomes 700 to 850 MPa
- DOL becomes 20 to 100 ⁇ m. Chemically tempered glass is obtained.
- the aluminosilicate glass has a problem that the ion exchange rate is high but the viscosity is high, so that the productivity is low and the cost is high.
- soda lime silicate glass is less expensive than aluminosilicate glass.
- the conventional soda-lime glass chemically strengthened glass has a low ion exchange rate, and thus it has been difficult to improve CS to a glass strength level that has been required in recent years. Therefore, a chemical strengthening treatment method capable of improving glass strength with chemically strengthened glass using soda lime silicate glass has been proposed (for example, Patent Document 1).
- Patent Document 2 discloses a glass composition containing SrO in order to compensate for the fact that MgO has an action of increasing the liquidus temperature T L , that is, the devitrification temperature.
- SrO is a component that inhibits ion exchange, and is not always sufficient as a composition that achieves both improved ion exchange performance and improved devitrification properties.
- the present invention is capable of improving the strength of conventional soda lime silicate glass even when subjected to the same chemical strengthening treatment as before, and has a good devitrification property, and a chemically strengthened glass using the same. It aims at providing the manufacturing method.
- the present inventors By adopting a specific glass composition, the present inventors have better chemical strengthening characteristics than conventional soda lime silicate glasses, improved devitrification characteristics, and are as viscous as conventional soda lime silicate glasses. The present inventors have found that a chemically strengthening glass excellent in productivity can be obtained.
- the present invention is as follows. SiO 2 is 60 to 72%, Al 2 O 3 is 4.4 to 10%, MgO is 5 to 10.9%, CaO is 0.1 to 5%, and Na 2 O is expressed in terms of mass percentage based on oxide. It contains 14 to 19%, 0 to 3% of K 2 O, and RO is 7% or more and 11% or less (RO is the sum of alkaline earth metal oxides, that is, MgO, CaO, SrO, BaO). and, RO / (RO + R 2 O) of 0.20 or more, 0.42 or less (R 2 O represents the sum of alkali metal oxides.) in a chemically strengthened glass.
- the glass for chemical strengthening of the present invention has a specific composition, and in particular, the contents of Al 2 O 3 , CaO and MgO, and RO and RO / (RO + R 2 O) are in a specific range. It is possible to provide a chemically strengthened glass that is easier to strengthen during chemical strengthening than soda lime silicate glass, has good devitrification properties, and has a viscosity similar to that of conventional soda lime silicate glass and excellent productivity.
- Figure 1 is a graph showing the correlation between the values of the T 4 -T L of the glass for chemical strengthening RO / (RO + R 2 O ).
- the glass for chemical strengthening of this embodiment is SiO 2 60 to 72%, Al 2 O 3 4.4 to 10%, MgO 5 to 10.9% and CaO 0 in terms of mass percentage based on oxide. 0.1 to 5%, Na 2 O 14 to 19%, K 2 O 0 to 3%, RO 7% to 11%, and RO / (RO + R 2 O) 0.20 or more 0.42 or less.
- glass for chemical strengthening refers to glass that is ion-exchangeable and suitable for chemical strengthening treatment.
- SiO 2 is known as a component that forms a network structure in the glass microstructure, and is a main component constituting the glass.
- the content of SiO 2 is 60% or more, preferably 62% or more, more preferably 63% or more, and further preferably 64% or more. Further, the content of SiO 2 is 72% or less, preferably 70% or less, more preferably 69% or less.
- the content of SiO 2 is 60% or more, it is advantageous in terms of stability and weather resistance as glass.
- the content of SiO 2 is 72% or less, it is advantageous in terms of solubility and moldability.
- Al 2 O 3 has an effect of improving the ion exchange performance in chemical strengthening, and in particular, an effect of improving CS. It is also known as a component that improves the weather resistance of glass. Moreover, there exists an effect
- the content of Al 2 O 3 is 1% or more, preferably 3% or more, more preferably 4% or more, still more preferably 4.4% or more, and particularly preferably 5% or more. Further, the content of Al 2 O 3 is 10% or less, more preferably 9% or less, still more preferably 8% or less, and particularly preferably 7% or less.
- the content of Al 2 O 3 is 1% or more, a desired CS value can be obtained by ion exchange, and an effect of suppressing intrusion of tin can be obtained.
- the content of Al 2 O 3 is 10% or less, the devitrification temperature does not increase greatly even when the viscosity of the glass is high, which is advantageous in terms of melting and forming in the soda lime glass production line. .
- MgO is a component that stabilizes glass and is essential.
- the content of MgO is 5% or more, preferably 6% or more, more preferably 7% or more, and further preferably 8% or more.
- the MgO content is 12% or less, preferably 10.9% or less, more preferably 10% or less, and still more preferably 9% or less.
- the content of MgO is 5% or more, the chemical resistance of the glass becomes good. The solubility at high temperature becomes good and devitrification hardly occurs.
- the content of MgO is 12% or less, the difficulty of devitrification is maintained, and a sufficient ion exchange rate is obtained.
- CaO is a component that stabilizes the glass and is essential. Since CaO tends to inhibit the exchange of alkali ions, when it is desired to increase the DOL, it is preferable to reduce the content.
- the content of CaO is 0.1% or more, preferably 0.5% or more, more preferably 0.8% or more.
- the amount in the case of containing CaO is 5% or less, preferably 4% or less, more preferably 3% or less.
- Na 2 O is an essential component for forming a surface compressive stress layer by ion exchange, and has an effect of deepening DOL while suppressing a decrease in CS. Moreover, it is a component which lowers the high temperature viscosity and devitrification temperature of glass, and improves the meltability and moldability of glass.
- the content of Na 2 O is 13% or more, preferably 14% or more, more preferably 15% or more. Further, the content of Na 2 O is 19% or less, preferably 18% or less, more preferably 17% or less.
- K 2 O is not essential, but may be contained because it has the effect of increasing the ion exchange rate and deepening the DOL. On the other hand, if the amount of K 2 O is excessive, sufficient CS cannot be obtained.
- the amount in the case of containing K 2 O is 5% or less, preferably 3% or less, more preferably 2% or less, and further preferably 1% or less. If the content of K 2 O is 5% or less, sufficient CS can be obtained.
- SrO is not essential, but may be contained because it has an effect of improving devitrification properties. On the other hand, if the amount of SrO is excessive, sufficient DOL cannot be obtained.
- the amount in the case of containing SrO is 3% or less, preferably 2% or less, more preferably less than 1%. A sufficient DOL is obtained when the SrO content is 3% or less.
- BaO is not essential, but may be contained because it has an effect of improving devitrification properties. On the other hand, if the amount of BaO is excessive, sufficient DOL cannot be obtained.
- the amount in the case of containing BaO is 2% or less, preferably 1% or less. If the BaO content is 2% or less, sufficient DOL is obtained.
- RO (where RO is an alkaline earth metal oxide, that is, the sum of MgO, CaO, SrO, and BaO) is a component that improves meltability and is an effective component for adjusting Tg and strain point.
- the RO content is preferably 5.1% or more, more preferably 7% or more, still more preferably 8% or more, and most preferably 9% or more. Further, it is preferably 11% or less, more preferably 10.5% or less, and still more preferably 10.3% or less. Solubility can be improved by RO being 5.1% or more. Moreover, devitrification characteristics can be improved when RO is 11% or less.
- the T 4 -T L is -50 ° C. or more, more preferably -30 ° C. or higher, further preferably -10 ° C. or higher.
- the temperature is preferably 0 ° C. or higher, more preferably 10 ° C. or higher, and further preferably 20 ° C. or higher.
- the value of RO / (RO + R 2 O ) exceeds 0.42, T 4 -T L becomes lower than 0 ° C., it tends to be devitrified. Therefore, in the chemically strengthened glass of the present invention, the value of RO / (RO + R 2 O) is 0.42 or less, preferably 0.41 or less, more preferably 0.40 or less, and further preferably 0. .39 or less. Further, the value of RO / (RO + R 2 O) is 0.20 or more, preferably 0.25 or more, more preferably 0.30 or more, and most preferably 0.35 or more. When the value of RO / (RO + R 2 O) is 0.20 or more, the thermal expansion coefficient (CTE) can be kept low.
- CTE thermal expansion coefficient
- the CTE is preferably 150 ⁇ 10 ⁇ 7 ° C. ⁇ 1 or less, more preferably 120 ⁇ 10 ⁇ 7 ° C. ⁇ 1 or less, and 100 ⁇ 10 ⁇ 7 ° C. ⁇ 1. More preferably, it is as follows.
- the high temperature viscosity is a physical property value that is an index for glass production, and a temperature (T 2 ) at which the viscosity is 10 2 dPa ⁇ s is set as an index of the melting temperature of the glass.
- T 2 is preferably 1550 ° C. or lower, more preferably 1530 ° C. or lower, and even more preferably 1510 ° C. or lower, from the viewpoint of the balance between the raw material solubility, the life of the manufacturing equipment and the manufacturing cost.
- T 4 A temperature (T 4 ) at which the viscosity was 10 4 dPa ⁇ s was set as an index of the temperature at which the molding was performed.
- T 4 is preferably higher. 1000 ° C or higher is preferable, 1020 ° C or higher is more preferable, 1040 ° C or higher is more preferable, and 1060 ° C or higher is most preferable.
- T 4 is preferably 1130 ° C. or lower, more preferably 1110 ° C. or lower, and further preferably 1090 ° C. or lower.
- sulfate, chloride, fluoride, and the like may be appropriately contained as a glass refining agent.
- the glass of the present invention consists essentially of the components described above, but may contain other components as long as the object of the present invention is not impaired. When such components are contained, the total content of these components is preferably 4% or less, more preferably 1% or less, and typically 0.5% or less.
- the other components will be described as an example.
- B 2 O 3 may be contained in a range of 4% or less in order to improve the melting property at high temperature or the glass strength. Preferably it is 1% or less. In general, when an alkali component of Na 2 O or K 2 O and B 2 O 3 are contained at the same time, volatilization becomes intense and the brick is remarkably eroded. Therefore, it is preferable that B 2 O 3 is not substantially contained.
- Fe 2 O 3 is a component that is extremely difficult to make its content zero because it exists in nature and everywhere in the production line. It is known that Fe 2 O 3 in an oxidized state causes yellow coloration, and FeO in a reduced state causes blue coloration, and it is known that the glass is colored green due to a balance between the two. .
- the content of Fe 2 O 3 is typically 0.005% or more, and is preferably 1% or less, more preferably 0.2% or less in order to suppress coloring. When Fe 2 O 3 is 1% or less, the glass can be prevented from being colored.
- TiO 2 is abundant in natural raw materials and is known to be a yellow coloring source.
- the amount in the case of containing TiO 2 is preferably 1% or less, more preferably 0.5% or less, and still more preferably 0.2% or less. When the content of TiO 2 is 1% or less, it is possible to avoid the phenomenon that the glass is yellowish.
- ZnO may be contained up to 2%, for example, in order to improve the melting property of the glass at a high temperature. However, when it is produced by the float process, it is preferably not contained because it is reduced by a float bath and becomes a product defect.
- ZrO 2 may be contained at a concentration of 4% or less in order to improve CS.
- the amount in the case of containing ZrO 2 is preferably 2% or less, and more preferably 1% or less.
- ZrO 2 is 4% or less, an increase in the devitrification temperature can be avoided.
- Li 2 O is a component that lowers the Tg to facilitate stress relaxation, and as a result makes it impossible to obtain a stable surface compressive stress layer, so it is preferable not to contain it. It is preferably less than 1%, more preferably 0.1% or less, particularly preferably less than 0.01%.
- the glass for chemical strengthening of the present embodiment is usually plate-shaped, but it may be a flat plate or a glass plate subjected to bending.
- the glass for chemical strengthening of this embodiment is a glass plate formed into a flat plate shape by a known glass forming method such as a float method, a fusion method, or a slot down draw method.
- the chemically strengthened glass of this embodiment has dimensions that can be molded by an existing molding method. That is, if it is formed by the float process, ribbon-like glass having a continuous float forming width can be obtained. Moreover, the glass for chemical strengthening of this embodiment is finally cut into a size suitable for the purpose of use.
- a display such as a tablet PC or a smartphone
- a window glass of a building or a house is the size of a display such as a tablet PC or a smartphone, or the size of a window glass of a building or a house.
- the glass of this embodiment is generally cut into a rectangle, but other shapes such as a circle or a polygon may be used without any problem, and a glass subjected to drilling is also included.
- the chemical strengthening treatment can be performed by a conventionally known method. Moreover, it is preferable to perform shape processing according to a use, for example, mechanical processing, such as a cutting
- an alkali metal salt for example, potassium nitrate salt
- alkali metal ions typically K ions
- the metal ions with a small ionic radius typically, Na ions
- metal ions with a large ionic radius typically, Na ions
- the chemical strengthening treatment can be performed, for example, by immersing a glass plate in a molten potassium nitrate salt at 330 to 550 ° C. for 5 minutes to 20 hours.
- optimum conditions may be selected in consideration of the viscosity characteristics of glass, application, plate thickness, tensile stress inside the glass, and the like.
- Examples of the molten salt for performing the ion exchange treatment include alkali nitrates such as potassium nitrate, potassium sulfate, and potassium chloride, alkali sulfates, and alkali chlorides. These molten salts may be used alone or in combination of two or more. Further, a salt containing sodium may be mixed in order to adjust the chemical strengthening characteristics.
- the treatment conditions for the chemical strengthening treatment are not particularly limited, and the optimum conditions may be selected in consideration of the characteristics of the glass and the molten salt.
- the chemically strengthened glass obtained by chemically strengthening the chemically strengthened glass of the present invention includes a compressive stress layer on the surface by ion exchange treatment.
- the surface compressive stress is preferably 300 MPa or more, and more preferably 500 MPa or more.
- wound exceeding the depth of a surface compressive-stress layer when using chemically strengthened glass will lead to destruction of glass
- the one where the surface compressive-stress layer is deep is preferable, and it is preferable that it is 10 micrometers or more, and is 12 micrometers or more. It is preferably 14 ⁇ m or more.
- it is preferably 40 ⁇ m or less, and more preferably 30 ⁇ m or less.
- the depth and surface compressive stress value of the surface compressive stress layer of the chemically strengthened glass of the present invention can be measured using a surface stress meter (for example, FSM-6000 manufactured by Orihara Seisakusho).
- the chemically tempered glass of the present invention preferably has at least one selected from the group consisting of sodium ions, silver ions, potassium ions, cesium ions and rubidium ions on the surface.
- a compressive stress is induced on the surface, and the strength of the glass is increased.
- antibacterial property can be provided by having silver ion on the surface.
- a chemically strengthened glass product can be obtained by chemically strengthening the chemically strengthened glass of the present invention.
- the chemically tempered glass product include a cover glass such as a display device and a glass substrate of the display.
- the use of the chemically strengthened glass of the present invention is not particularly limited. Since it has high mechanical strength, it is suitable for use in places where impact due to dropping or contact with other substances is expected.
- mobile phones including multifunctional information terminals such as smartphones
- PHS, PDA, tablet terminals notebook personal computers, game machines, portable music / video players, electronic books, electronic terminals
- Cover glass for display parts such as watches, cameras or GPS, touch sensor glass for monitors for touch panel operation of these devices, cover glasses for cookers such as microwave ovens and oven toasters, top plates such as electromagnetic cookers, meters
- machines or devices such as cover glass for instruments such as gauges and glass plates for reading parts such as copying machines or scanners.
- glass for windows of buildings, houses, vehicles, ships, aircraft, etc. lighting equipment for home use or industrial use, signals, guide lights, cover boards for electric bulletin boards, showcases, bulletproof glasses, etc.
- Examples include a cover glass for protecting a solar cell and a condensing glass material for increasing the power generation efficiency of the solar cell.
- it can be used as a building material such as an aquarium, dishes such as dishes and cups, various cooking utensils such as bottles or chopping boards, cupboards, shelf boards and walls of refrigerators, roofs or partitions.
- a building material such as an aquarium, dishes such as dishes and cups, various cooking utensils such as bottles or chopping boards, cupboards, shelf boards and walls of refrigerators, roofs or partitions.
- chemically strengthened glass produced after the chemical strengthening treatment is optimal as a glass material for display incorporated in various image display devices such as liquid crystal, plasma, and organic EL.
- the obtained molten glass was poured into a mold material, held at a temperature of Tg + 30 ° C. for 1 hour, and then cooled to room temperature at a rate of 1 ° C./min to obtain a glass block.
- the glass block was cut and ground, and finally both surfaces were processed into mirror surfaces to obtain a plate glass (chemical strengthening glass) having a size of 20 mm ⁇ 20 mm and a thickness of 1 mm.
- the specific gravity, Tg, T 2 , T 4 , TL and CTE of this glass were measured. The results are shown in Tables 1 and 2.
- the obtained glass for chemical strengthening was chemically strengthened by immersing it in 97.8% KNO 3 , 2.2% NaNO 3 molten salt at 425 ° C. for 2 hours and 30 minutes to obtain a chemically strengthened glass.
- CS and DOL were measured for each glass after chemical strengthening treatment. The results are shown in Tables 1 and 2.
- the numerical values in parentheses in Table 1 and Table 2 indicate calculated values. For calculated values, creating a linear regression equation from the measured values and the glass composition of T 2 and T 4, it was calculated.
- CTE CTE is measured according to JIS R 1618: 2002 by measuring the glass transition point (Tg) and using a thermal dilatometer (Bruker AXS, TD5000SA) at a heating rate of 5 ° C./min. The average linear thermal expansion coefficient at 350 ° C. was determined.
- the numerical values in parentheses in Table 1 and Table 2 indicate calculated values. About the calculated value, a linear regression equation was created from the measured value of CTE and the glass composition, and was calculated.
- Devitrification temperature (T L ) Regarding the devitrification temperature, the glass was crushed into glass particles of about 2 mm in a mortar, the glass particles were placed in a platinum boat, and heat-treated in increments of 5 ° C. for 24 hours in a temperature gradient furnace. The maximum value of the temperature of the glass grains on which the crystals were precipitated was defined as the devitrification temperature.
- CS Surface compressive stress
- DOL compressive stress layer depth
- the surface compressive stress and the compressive stress layer depth were measured with a surface stress meter FSM-6000 manufactured by Orihara Seisakusho.
- the numerical values in parentheses in Table 1 and Table 2 indicate calculated values. About a calculated value, the linear regression equation was created from the measured value and glass composition of CS and DOL, and it calculated
- Examples 1 to 16 are Examples, and Examples 17 to 23 are Comparative Examples. The following considerations were obtained from the results shown in Tables 1 and 2.
- the glass for chemical strengthening of the present invention prepared in each example is a DOL caused by chemical strengthening, particularly when the contents of Al 2 O 3 , CaO and MgO, and RO and RO / (RO + R 2 O) are in a specific range.
- the value can effectively be improved, T 4 -T L is high, it can be seen that it is possible to improve the devitrification property.
- the glass for chemical strengthening of Comparative Examples 17, 18, 21, and 22 has a composition with a small amount of MgO and a large amount of CaO.
- the chemically strengthened glass which chemically strengthened the glass for chemical strengthening of Examples 17, 18, 21, and 22 is a glass with low DOL and is hard to enter
- the value of RO / (RO + R 2 O) is 0.43 and exceeds 0.42. Therefore, the value of T 4 -T L glass for chemical strengthening of Examples 19 and 20, Examples 19 -122 ° C., Example 20 has become less than both 0 °C at -134 ° C., devitrification characteristic It was bad.
- the chemically strengthened glasses of Example 15 and Comparative Examples 17 to 22 have RO / (RO + R 2 O) larger than 0.41 and RO / (RO + R 2 O) smaller than 0.40. compared to examples 1 to 11 of example, since the value of T 4 -T L is low, the value of RO / (RO + R 2 O ) is more preferably 0.40 or less.
- the glass for chemical strengthening of Example 15 and Comparative Examples 17 to 22 has an RO of over 11% and an RO of 11% or less as compared with Examples 1 to 11 of Examples. since the value of T 4 -T L is low, RO is more preferably not more than 11%.
- the chemically strengthened glass of the present invention obtained by subjecting the chemically strengthened glass of the present invention to a chemical strengthening treatment can be used for a display device, particularly a cover glass of a touch panel display. Moreover, it can utilize also for the double glazing for building houses, a solar cell substrate, etc.
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Abstract
Description
酸化物基準の質量百分率表示でSiO2を60~72%、Al2O3を4.4~10%、MgOを5~10.9%、CaOを0.1~5%、Na2Oを14~19%、K2Oを0~3%を含有し、ROが7%以上11%以下(ROはアルカリ土類金属酸化物、すなわち、MgO、CaO、SrO、BaOの和を示す。)、および、RO/(RO+R2O)が0.20以上、0.42以下(R2Oはアルカリ金属酸化物の和を示す。)である化学強化用ガラス。
以下に本発明の一実施形態について説明する。本実施形態の化学強化用ガラスは、酸化物基準の質量百分率表示でSiO2を60~72%、Al2O3を4.4~10%、MgOを5~10.9%、CaOを0.1~5%、Na2Oを14~19%、K2Oを0~3%を含有し、ROが7%以上11%以下、および、RO/(RO+R2O)が0.20以上、0.42以下であることを特徴とする。ここで、「化学強化用ガラス」とは、イオン交換可能なガラスであり、化学強化処理に適したガラスを指す。
一方、耐薬品性を向上させるためには、0.5%以上、好ましくは1%以上、より好ましくは2%以上、さらに好ましくは3%以上含有することが好ましい。
化学強化処理は、従来公知の方法によって行うことができる。また、化学強化処理の前に、用途に応じた形状加工、例えば、切断、端面加工及び穴あけ加工などの機械的加工を行うことが好ましい。
本発明の化学強化用ガラスを化学強化して得られる化学強化ガラス(以下、本発明の化学強化ガラスともいう。)は、イオン交換処理によって表面に圧縮応力層を備える。表面圧縮応力は300MPa以上であることが好ましく、500MPa以上であることがより好ましい。
表1及び表2の例1~23についてSiO2からK2Oまでの欄に質量百分率表示で示す組成になるように、酸化物、水酸化物、炭酸塩または硝酸塩等一般に使用されているガラス原料を適宜選択し、ガラスとして900gとなるように秤量した。ついで、混合した原料を白金製るつぼに入れ、1600℃の抵抗加熱式電気炉に投入し、4時間溶融し、脱泡、均質化した。
(1)比重
比重はアルキメデス法で測定した。表1及び表2中のカッコ内の数値は、計算値を示す。計算値については、比重の測定値とガラス組成から線形回帰式を作成して、計算により求めた。
(2)ガラス転移点(Tg)
ガラス転移点はTMAにより測定した。表1及び表2中のカッコ内の数値は、計算値を示す。計算値については、Tgの測定値とガラス組成から線形回帰式を作成して、計算により求めた。
(3)高温粘性
粘度が102dPa・sとなる温度(T2)、粘度が104dPa・sとなる温度(T4)は回転式粘度計を用いて測定した。表1及び表2中のカッコ内の数値は、計算値を示す。計算値については、T2及びT4の測定値とガラス組成から線形回帰式を作成して、計算により求めた。
(4)CTE
CTEはJIS R 1618:2002に基づき、ガラス転移点(Tg)の測定と同時に熱膨張計(ブルカー・エイエックスエス社製、TD5000SA)を用いて5℃/分の昇温速度で測定し50~350℃の平均線熱膨張係数を求めた。表1及び表2中のカッコ内の数値は、計算値を示す。計算値については、CTEの測定値とガラス組成から線形回帰式を作成して、計算により求めた。
(5)失透温度(TL)
失透温度は、ガラスを乳鉢で2mm程度のガラス粒に粉砕し、このガラス粒を白金ボートに並べて置き、温度傾斜炉中において5℃刻みで24時間熱処理した。結晶が析出しているガラス粒の温度の最高値を失透温度とした。
(6)表面圧縮応力(CS)及び圧縮応力層深さ(DOL)
表面圧縮応力及び圧縮応力層深さは、折原製作所社製表面応力計FSM-6000にて測定した。表1及び表2中のカッコ内の数値は、計算値を示す。計算値については、CS及びDOLの測定値とガラス組成から線形回帰式を作成して、計算により求めた。
表1及び表2に示す結果から以下の考察が得られた。
Claims (12)
- 酸化物基準の質量百分率表示でSiO2を60~72%、Al2O3を4.4~10%、MgOを5~10.9%、CaOを0.1~5%、Na2Oを14~19%、K2Oを0~3%を含有し、ROが7%以上11%以下(ROはアルカリ土類金属酸化物、すなわち、MgO、CaO、SrO、BaOの和を示す。)、および、RO/(RO+R2O)が0.20以上、0.42以下(R2Oはアルカリ金属酸化物の和を示す。)である化学強化用ガラス。
- RO/(RO+R2O)が0.40以下である請求項1に記載の化学強化用ガラス。
- Al2O3を5%以上含有する請求項1又は2に記載の化学強化用ガラス。
- MgOを6%以上含有する請求項1~3のいずれか1項に記載の化学強化用ガラス。
- MgOを10%以下含有する請求項1~4のいずれか1項に記載の化学強化用ガラス。
- B2O3を0~4%、Fe2O3を0~1%、TiO2を0~1%を含有する請求項1~5のいずれか1項に記載の化学強化用ガラス。
- 粘度が102dPa・sとなる温度(T2)が1550℃以下である請求項1~6のいずれか1項に記載の化学強化用ガラス。
- フロート法により成形される請求項1~7のいずれか1項に記載の化学強化用ガラス。
- 請求項1~8のいずれか1項に記載の化学強化用ガラスを化学強化処理して得られる化学強化ガラス。
- 表面圧縮応力が300MPa以上である請求項9に記載の化学強化ガラス。
- 圧縮応力深さが10μm以上である請求項9又は10に記載の化学強化ガラス。
- 請求項1~8のいずれか1項に記載の化学強化用ガラスをイオン交換処理する化学強化工程を含む化学強化ガラスの製造方法。
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