WO2020080164A1 - 無アルカリガラス板 - Google Patents
無アルカリガラス板 Download PDFInfo
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- WO2020080164A1 WO2020080164A1 PCT/JP2019/039491 JP2019039491W WO2020080164A1 WO 2020080164 A1 WO2020080164 A1 WO 2020080164A1 JP 2019039491 W JP2019039491 W JP 2019039491W WO 2020080164 A1 WO2020080164 A1 WO 2020080164A1
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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
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
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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
- C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
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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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/097—Glass compositions containing silica with 40% to 90% silica, by weight containing phosphorus, niobium or tantalum
Definitions
- the present invention relates to a non-alkali glass plate, and is particularly suitable for a carrier glass that holds a substrate for forming a TFT circuit or a resin substrate for forming a TFT circuit in a flat panel display such as a liquid crystal display and an organic EL display.
- a carrier glass that holds a substrate for forming a TFT circuit or a resin substrate for forming a TFT circuit in a flat panel display such as a liquid crystal display and an organic EL display.
- alkali-free glass plate Regarding alkali-free glass plate.
- liquid crystal panels and organic EL panels are equipped with thin film transistors (TFTs) for drive control.
- TFTs thin film transistors
- Amorphous silicon, low temperature polysilicon, high temperature polysilicon, etc. are known as thin film transistors that drive displays.
- a low temperature polysilicon TFT can meet this need, but will go through a high temperature film forming process at 500 to 600 ° C.
- the conventional glass plate causes large thermal contraction before and after the high temperature film forming process, which causes a pattern shift of the thin film transistor. Therefore, a glass plate with low heat shrinkage is required for high resolution display.
- further high definition display has been studied, and in that case, it is necessary to further reduce the heat shrinkage of the glass plate.
- the first method is to hold the glass plate in advance near the heat treatment temperature of the film forming process and gradually cool it. In this method, since the glass relaxes its structure and shrinks during slow cooling, the amount of heat shrinkage in the subsequent high temperature film forming process can be suppressed. However, this method causes an increase in the number of manufacturing steps and manufacturing time, resulting in an increase in the manufacturing cost of the glass plate.
- the second method is to increase the strain point of the glass plate.
- the overflow downdraw method is generally cooled from the melting temperature to the molding temperature in a relatively short time. Due to this effect, the fictive temperature of the glass plate becomes high, and the heat shrinkage of the glass plate becomes large. Therefore, if the strain point of the glass plate is increased, the viscosity of the glass plate at the heat treatment temperature of the film forming process becomes large, and it becomes difficult to proceed with structural relaxation. As a result, heat shrinkage of the glass plate can be suppressed. The higher the heat treatment temperature in the film forming process, the greater the effect of increasing the strain point with respect to the reduction of heat shrinkage. Therefore, in the case of the low temperature polysilicon TFT, it is desirable that the glass plate has a high strain point.
- Patent Document 1 discloses that the content of B 2 O 3 in the glass composition is reduced to increase the strain point of the glass plate. Further, Patent Document 1 discloses that Y 2 O 3 and / or La 2 O 3 are introduced into the glass composition to avoid a decrease in devitrification resistance due to a low B 2 O 3 content. . However, since Y 2 O 3 and La 2 O 3 are rare earth elements, the raw material cost is high and the manufacturing cost of the glass plate is increased.
- the present invention has been made in view of the above circumstances, and a technical problem thereof is to provide an alkali-free glass plate having a high strain point and capable of reducing the manufacturing cost.
- the alkali-free glass plate of the present invention has a glass composition of, in mol%, SiO 2 60 to 74%, Al 2 O 3 6 to 20%, B 2 O 3 0 to 9%, MgO 1 to 13%, Contains CaO 1 to 13%, SrO 0 to 7%, BaO 0 to 8%, Y 2 O 3 + La 2 O 3 0 to less than 1.0%, contains substantially no alkali metal oxide, and has a strain.
- the point is 650 ° C. or higher.
- Y 2 O 3 + La 2 O 3 refers to the total content of Y 2 O 3 and La 2 O 3.
- an alkali metal oxides in the glass composition (Li 2 O, Na 2 O , K 2 O) content is less than 0.5 mol% (preferably (Less than 0.1 mol%).
- strain point refers to a value measured based on the method of ASTM C336.
- the alkali-free glass plate of the present invention preferably has a SrO + BaO content of 0 to 3 mol%.
- SrO + BaO refers to the total amount of SrO and BaO.
- the alkali-free glass plate of the present invention preferably has a strain point of 700 ° C. or higher.
- the Young's modulus of the alkali-free glass plate of the present invention is preferably 79 GPa or more.
- the "Young's modulus” can be measured by the bending resonance method.
- the alkali-free glass plate of the present invention preferably has a thermal expansion coefficient of 30 ⁇ 10 ⁇ 7 to 45 ⁇ 10 ⁇ 7 / ° C. By doing so, it is possible to prevent a situation in which a local dimensional change occurs in the glass plate due to temperature unevenness in the high temperature film forming process.
- the alkali-free glass plate of the present invention preferably has a temperature at a high temperature viscosity of 10 2.5 dPa ⁇ s of 1600 ° C. or lower. With this, the melting cost can be reduced.
- the glass composition of the alkali-free glass plate of the present invention is, in mol%, SiO 2 60 to 74%, Al 2 O 3 6 to 20%, B 2 O 3 0 to 9%, MgO 1 to 13%, CaO 1 To 13%, SrO 0 to 7%, BaO 0 to 8%, Y 2 O 3 + La 2 O 3 0 to less than 1.0%, and is substantially free of alkali metal oxides. .
- the reasons for limiting the content of each component as described above are shown below. In the description of the content of each component,% is expressed as mol% unless otherwise specified.
- SiO 2 is a component that forms the glass skeleton and is a component that increases the strain point. Therefore, the content of SiO 2 is preferably 60% or more, 62% or more, 64% or more, and particularly 66% or more. On the other hand, when the content of SiO 2 is too large, the high temperature viscosity becomes high, and the meltability is likely to decrease. Therefore, the content of SiO 2 is preferably 74% or less, 72% or less, 70% or less, and particularly 68% or less.
- Al 2 O 3 is a component that forms a glass skeleton, a component that raises the strain point, and a component that suppresses phase separation. Therefore, the content of Al 2 O 3 is preferably 6% or more, 8% or more, 10% or more, and particularly 12% or more. On the other hand, when the content of Al 2 O 3 is too large, the high temperature viscosity becomes high, and the meltability is likely to decrease. Therefore, the content of Al 2 O 3 is preferably 20% or less, 18% or less, 16% or less, and particularly 14% or less.
- B 2 O 3 is an optional component, but is a component that markedly improves the meltability. Therefore, the content of B 2 O 3 is preferably 0% or more, 0.01% or more, 0.1% or more, 0.2% or more, 0.3% or more, 0.4% or more, and particularly preferably 0. It is 5% or more.
- the content of B 2 O 3 is too large, the strain point is significantly lowered and the ⁇ -OH value is significantly increased. As will be described in detail later, as the ⁇ -OH value increases, the thermal contraction in the temperature range below the strain point increases. Therefore, the content of B 2 O 3 is preferably 9% or less, 7% or less, 5% or less, and particularly 4% or less.
- the molar ratio SiO 2 / B 2 O 3 is preferably 50 or less, 40 or less, 30 or less, 25 or less, and particularly preferably 20 or less. If the molar ratio SiO 2 / B 2 O 3 is too large, it becomes difficult to achieve both a high strain point and a high meltability. Note that “SiO 2 / B 2 O 3 ” refers to a value obtained by dividing the content of SiO 2 by the content of B 2 O 3 .
- MgO is a component that lowers viscosity at high temperature and enhances meltability, and also a component that enhances devitrification resistance by balancing with other components. Further, it is a component that remarkably enhances Young's modulus from the viewpoint of mechanical properties. Therefore, the content of MgO is preferably 1% or more, 3% or more, 5% or more, 6% or more, and particularly 7% or more. On the other hand, if the content of MgO is too large, the strain point tends to be lowered, or the balance with other components is lost and the devitrification tendency becomes stronger. Therefore, the content of MgO is preferably 15% or less, 13% or less, 10% or less, and particularly 8% or less.
- CaO is a component that lowers the viscosity at high temperature and enhances the meltability, and also a component that enhances devitrification resistance by balancing with other components. Therefore, the content of CaO is preferably 1% or more, 3% or more, and particularly 5% or more. On the other hand, if the content of CaO is too large, the strain point tends to decrease. Therefore, the content of CaO is preferably 15% or less, 13% or less, 10% or less, 8% or less, and particularly 7% or less.
- the SrO content is preferably 0% or more, 0.5% or more, 1% or more, and particularly 1.5% or more.
- the SrO content is preferably 7% or less, 5% or less, 3% or less, and particularly 2% or less.
- BaO is a component that lowers the viscosity at high temperature and enhances meltability, and also a component that enhances devitrification resistance by balancing with other components. Therefore, the content of BaO is preferably 0% or more, 0.5% or more, 1% or more, and particularly 1.5% or more. On the other hand, if the content of BaO is too large, the strain point tends to be lowered. Therefore, the content of BaO is preferably 8% or less, 6% or less, 4% or less, 3% or less, and particularly 2% or less.
- the total amount of SrO and BaO is preferably 0% or more, 0.5% or more, 1% or more, 1.2% or more, 1.4% or more, and particularly 1.6% or more. If the total amount of SrO and BaO is too small, the meltability tends to decrease. On the other hand, if the total amount of SrO and BaO is too large, the component balance of the glass composition is impaired, and the devitrification resistance tends to decrease. Therefore, the total amount of SrO and BaO is preferably 6% or less, 4% or less, 3% or less, 2.5% or less, 2.2% or less, and particularly 2% or less.
- the molar ratio B 2 O 3 / BaO is preferably 1 or more, 2 or more, 5 or more, 8 or more, and particularly 10 or more. If the molar ratio B 2 O 3 / BaO is too small, in the glass system according to the present application, the balance of the glass components is lost and the devitrification resistance is likely to decrease. “B 2 O 3 / BaO” refers to a value obtained by dividing the content of B 2 O 3 by the content of BaO.
- the molar ratio BaO / (SrO + BaO) is preferably 1 or less, 0.8 or less, 0.6 or less, 0.4 or less, and particularly 0.2 or less. If the molar ratio BaO / (SrO + BaO) is too large, in the glass system according to the present application, the balance of the glass components is lost, and the devitrification resistance is likely to decrease.
- BaO / (SrO + BaO) refers to a value obtained by dividing the content of BaO by the total amount of SrO and BaO.
- the molar ratio (SiO 2 + Al 2 O 3 + B 2 O 3 ) / (SrO + BaO) is preferably 10 or more, 15 or more, 20 or more, 25 or more, particularly 30 or more. If the molar ratio (SiO 2 + Al 2 O 3 + B 2 O 3 ) / (SrO + BaO) is too small, it becomes difficult to achieve both a high strain point and a high Young's modulus. “(SiO 2 + Al 2 O 3 + B 2 O 3 ) / (SrO + BaO)” refers to a value obtained by dividing the total amount of SiO 2 , Al 2 O 3 and B 2 O 3 by the total amount of SrO and BaO. .
- (CaO + SrO + BaO)-(Al 2 O 3 + B 2 O 3 ) is preferably 5% or less, 3% or less, 1% or less, 0% or less, -1% or less, -3% or less, and particularly -4%. It is the following.
- the strain point becomes low and the heat shrinkage ratio becomes large.
- (CaO + SrO + BaO)-(Al 2 O 3 + B 2 O 3 ) is preferably -20% or more, -15% or more, -10% or more, -7% or more, and particularly -6% or more.
- “(CaO + SrO + BaO)-(Al 2 O 3 + B 2 O 3 )” refers to a value obtained by subtracting the total amount of Al 2 O 3 and B 2 O 3 from the total amount of CaO, SrO, and BaO.
- Y 2 O 3 is a component that increases the strain point and the Young's modulus, but if the content is too large, the density and the raw material cost tend to increase. Therefore, the content of Y 2 O 3 is preferably 0 to 0.8%, 0 to 0.7%, 0 to 0.5%, 0 to 0.2%, and particularly 0 to less than 0.1%. is there.
- La 2 O 3 is a component that increases the strain point and the Young's modulus, but if the content is too large, the density and the raw material cost tend to increase. Therefore, the content of La 2 O 3 is preferably 0 to 0.8%, 0 to 0.7%, 0 to 0.5%, 0 to 0.2%, and particularly 0 to less than 0.1%. is there.
- the total amount of Y 2 O 3 and La 2 O 3 is preferably 0 to less than 1.0%, 0 to 0.8%, 0 to 0.7%, 0 to 0.5%, 0 to 0.2. %, Especially 0 to less than 0.1%.
- the total amount of Y 2 O 3 and La 2 O 3 is too large, the density and the raw material cost tend to increase.
- the alkali-free glass plate of the present invention may contain the following components in the glass composition in addition to the above components.
- ZnO is a component that enhances the meltability, but if ZnO is contained in a large amount, the glass tends to devitrify and the strain point tends to decrease.
- the ZnO content is preferably 0 to 5%, 0 to 3%, 0 to 0.5%, 0 to 0.3%, and particularly 0 to 0.2%.
- P 2 O 5 is a component that significantly lowers the liquidus temperature of the Al-based devitrification crystal while maintaining the strain point.
- the content of P 2 O 5 is preferably 0 to 5%, 0 to 3%, 0 to 1%, and particularly 0 to 0.5%.
- TiO 2 is a component that lowers the viscosity at high temperature and enhances the meltability, and is a component that suppresses solarization. However, when a large amount of TiO 2 is contained, the glass is colored and the transmittance easily decreases. . Therefore, the content of TiO 2 is preferably 0 to 3%, 0 to 1%, 0 to 0.1%, and particularly 0 to 0.02%.
- SnO 2 is a component that has a good fining action in a high temperature range, a component that raises the strain point, and a component that lowers the high temperature viscosity.
- the content of SnO 2 is preferably 0 to 1%, 0.001 to 1%, 0.05 to 0.5%, and particularly 0.08 to 0.2%. When the content of SnO 2 is too large, devitrified crystals of SnO 2 are likely to precipitate. If the SnO 2 content is less than 0.001%, it becomes difficult to enjoy the above effects.
- SnO 2 is suitable as a fining agent, but fining agents other than SnO 2 may be used as long as glass properties are not significantly impaired.
- As 2 O 3 , Sb 2 O 3 , CeO 2 , F 2 , Cl 2 , SO 3 , and C may be added in a total amount up to, for example, 0.5%, and a metal such as Al or Si.
- the powder may be added in total, for example up to 0.5%.
- As 2 O 3 and Sb 2 O 3 are excellent in clarification property, but it is preferable not to introduce as much as possible from an environmental viewpoint. Furthermore, since a large amount of As 2 O 3 contained in glass tends to lower the solarization resistance, its content is preferably 0.5% or less, particularly preferably 0.1% or less, and substantially. It is desirable not to include it.
- the phrase “substantially free of As 2 O 3 ” refers to the case where the content of As 2 O 3 in the glass composition is less than 0.05%. Further, the content of Sb 2 O 3 is preferably 1% or less, particularly preferably 0.5% or less, and it is desirable that Sb 2 O 3 is not substantially contained.
- “substantially free of Sb 2 O 3 ” refers to a case where the content of Sb 2 O 3 in the glass composition is less than 0.05%.
- Cl has the effect of promoting the melting of non-alkali glass, and if Cl is added, the melting temperature can be lowered, and the action of the fining agent can be promoted. As a result, the melting cost can be reduced and the glass manufacturing kiln can be reduced. It is possible to extend the life of the. However, if the Cl content is too high, the strain point tends to decrease. Therefore, the content of Cl is preferably 0.5% or less, particularly 0.1% or less.
- a chloride of an alkaline earth metal oxide such as strontium chloride, or aluminum chloride can be used.
- the alkali-free glass plate of the present invention preferably has the following characteristics.
- the coefficient of thermal expansion is preferably 30 ⁇ 10 ⁇ 7 to 45 ⁇ 10 ⁇ 7 / ° C., 30 ⁇ 10 ⁇ 7 to 42 ⁇ 10 ⁇ 7 / ° C., 30 ⁇ 10 ⁇ 7 to 40 ⁇ 10 ⁇ 7 / ° C., 30 It is x10 -7 to 38 x 10 -7 / ° C, especially 30 x 10 -7 to 36 x 10 -7 / ° C. If the coefficient of thermal expansion is too high, local dimensional changes easily occur in the glass plate due to temperature unevenness in the high temperature film forming process.
- Density is preferably 2.80 g / cm 3 or less, 2.75 g / cm 3 or less, 2.70 g / cm 3 or less, 2.65 g / cm 3 or less, 2.60 g / cm 3 or less, 2.55 g / cm 3 or less, particularly 2.45 to 2.50 g / cm 3 . If the density is too high, the amount of bending of the glass plate becomes large, so that it is easy to promote the pattern displacement due to stress in the manufacturing process of the display and the like.
- the strain point is preferably 650 ° C or higher, 680 ° C or higher, 700 ° C or higher, 710 ° C or higher, 720 ° C or higher, 730 ° C or higher, particularly 740 ° C or higher.
- the strain point is too low, the glass plate is likely to undergo heat shrinkage in the high temperature film forming process.
- the annealing point is preferably 720 ° C or higher, 750 ° C or higher, 780 ° C or higher, particularly 800 ° C or higher. If the annealing point is too low, the glass plate is likely to undergo heat shrinkage in the high temperature film forming process.
- the softening point is preferably 940 ° C or higher, 960 ° C or higher, 980 ° C or higher, and particularly 1000 ° C or higher.
- the softening point is too low, the glass plate is likely to undergo heat shrinkage in the high temperature film forming process.
- the temperature at a high temperature viscosity of 10 2.5 dPa ⁇ s is preferably 1656 ° C. or lower, 1620 ° C. or lower, 1600 ° C. or lower, 1590 ° C. or lower, 1580 ° C. or lower, particularly 1570 ° C. or lower.
- the temperature at 10 2.5 dPa ⁇ s becomes high, the meltability and the fining property are likely to deteriorate, and the manufacturing cost of the glass plate rises.
- the Young's modulus is preferably 76 GPa or more, 78 GPa or more, 79 GPa or more, 80 GPa or more, 81 GPa or more, 82 GPa or more, and particularly 83 GPa or more. If the Young's modulus is too low, the amount of bending of the glass plate becomes large, which facilitates pattern shift due to stress in the manufacturing process of the display and the like.
- Specific modulus is preferably 29GPa / g ⁇ cm -3 or more, 30GPa / g ⁇ cm -3 or more, 31GPa / g ⁇ cm -3 or more, 32GPa / g ⁇ cm -3 or more, particularly 33GPa / g ⁇ cm - It is 3 or more. If the specific Young's modulus is too low, the amount of bending of the glass plate is likely to be large, which facilitates stress-induced pattern displacement in the manufacturing process of the display and the like.
- the liquidus temperature is preferably 1450 ° C or lower, 1300 ° C or lower, 1200 ° C or lower, and particularly 1150 ° C or lower. In this way, devitrification crystals are less likely to occur during molding. Further, since it becomes easy to form by the overflow down draw method, the surface quality of the glass plate can be easily improved and the manufacturing cost of the glass plate can be reduced.
- the "liquidus temperature” was defined as that after passing through a standard sieve 30 mesh (500 ⁇ m) and leaving 50 mesh (300 ⁇ m) glass powder in a platinum boat and holding it in a temperature gradient furnace for 24 hours, crystals were precipitated. Temperature.
- the liquidus viscosity is preferably 10 4.6 dPa ⁇ s or more, 10 5.0 dPa ⁇ s or more, 10 5.2 dPa ⁇ s or more, and particularly 10 5.5 dPa ⁇ s or more. In this way, devitrification is less likely to occur during molding, which facilitates the molding by the overflow downdraw method, and as a result, the surface quality of the glass plate can be improved and the manufacturing cost of the glass plate can be reduced. Can be converted.
- the "liquidus viscosity” refers to the viscosity of glass at the liquidus temperature, and can be measured by the platinum ball pulling method.
- the ⁇ -OH value is an index showing the amount of water in the glass, and lowering the ⁇ -OH value can increase the strain point. Further, even if the glass compositions are the same, the smaller the ⁇ -OH value is, the smaller the heat shrinkage is in the temperature range below the strain point.
- the ⁇ -OH value is preferably 0.30 / mm or less, 0.25 / mm or less, 0.20 / mm or less, 0.15 / mm or less, and particularly 0.10 / mm or less. If the ⁇ -OH value is too small, the meltability tends to decrease. Therefore, the ⁇ -OH value is preferably 0.01 / mm or more, particularly 0.03 / mm or more.
- the “ ⁇ -OH value” refers to a value obtained by measuring the transmittance of glass using FT-IR and using the following mathematical formula 1.
- the alkali-free glass plate of the present invention preferably has an overflow merging surface in the central portion in the plate thickness direction. That is, it is preferably formed by the overflow down draw method.
- the overflow down draw method is a method in which molten glass overflows from both sides of the wedge-shaped refractory and the overflowed molten glass is merged at the lower ends of the wedges, and stretched downward to form a flat plate shape.
- the surface of the glass plate which is to be the surface, does not come into contact with the refractory material, and is formed in a free surface state. Therefore, it is possible to inexpensively manufacture a glass plate that is not polished and has a good surface quality. Further, it is easy to increase the area and reduce the wall thickness.
- overflow down draw method for example, it is possible to mold by the slot down method, the redraw method, the float method, and the roll out method.
- the plate thickness is not particularly limited, but is preferably 1.0 mm or less, 0.7 mm or less, 0.5 mm or less, and particularly 0.05 to 0.4 mm.
- the plate thickness can be adjusted by the flow rate during glass production, the molding speed (plate drawing speed), and the like.
- a glass batch prepared in the above glass composition is charged into a melting furnace, and heating is performed by energization by a heating electrode to obtain a molten glass. And a forming step of forming the obtained molten glass into an alkali-free glass plate by an overflow down draw method.
- the glass plate manufacturing process generally includes a melting process, a refining process, a supplying process, a stirring process, and a forming process.
- the melting step is a step of melting a glass batch prepared by mixing glass raw materials to obtain molten glass.
- the refining step is a step of refining the molten glass obtained in the melting step by the action of a refining agent or the like.
- the supply step is a step of transferring the molten glass between the steps.
- the stirring step is a step of stirring the molten glass to homogenize it.
- the forming step is a step of forming the molten glass into a glass plate.
- a step other than the above, for example, a state adjusting step of adjusting the molten glass to a state suitable for molding may be incorporated after the stirring step.
- non-alkali glass plates When industrially manufacturing non-alkali glass plates, they are generally melted by heating with the combustion flame of a burner.
- the burner is usually arranged above the melting kiln, and fossil fuels, specifically liquid fuels such as heavy oil and gas fuels such as LPG are used as fuels. Combustion flames can be obtained by mixing fossil fuel and oxygen gas.
- a large amount of water is mixed in the molten glass during melting, so that the ⁇ -OH value is likely to increase. Therefore, in producing a non-alkali glass plate, it is preferable to perform energization heating with a heating electrode, and to melt by energization heating with a heating electrode without performing heating by a combustion flame of a burner, that is, complete electric melting Is preferred.
- the ⁇ -OH value is 0.30 / mm or less, 0.25 / mm or less, 0.20 / mm or less, 0.15 / mm or less, In particular, it becomes easy to regulate to 0.10 / mm or less.
- the heating electrode is used for energization heating, the amount of energy per mass for obtaining the molten glass is reduced and the amount of molten volatiles is reduced, so that the environmental load can be reduced.
- the smaller the water content in the glass batch the easier it is to reduce the ⁇ -OH value in the glass plate.
- the raw material for introducing B 2 O 3 is likely to be the largest source of water contamination. Therefore, from the viewpoint of producing an alkali-free glass plate having a low ⁇ -OH value, it is preferable to reduce the content of B 2 O 3 as much as possible.
- the smaller the water content in the glass batch the easier the glass batch is to spread uniformly in the melting kiln, which facilitates the production of a homogeneous and high-quality glass plate.
- the electric heating by the heating electrode is preferably performed by applying an AC voltage to the heating electrode provided at the bottom or the side of the melting kiln so as to contact the molten glass in the melting kiln.
- the material used for the heating electrode is preferably one having heat resistance and corrosion resistance to molten glass, and for example, tin oxide, molybdenum, platinum, rhodium or the like can be used, and in particular, from the viewpoint of freedom of installation in a furnace, molybdenum is used. Is preferred.
- Tables 1 to 28 show examples of the present invention (sample Nos. 1 to 391).
- a glass batch prepared by mixing glass raw materials so as to have the glass composition shown in the table was put into a platinum crucible and then melted at 1600 to 1650 ° C. for 24 hours. Upon melting the glass batch, it was homogenized by stirring with a platinum stirrer. Next, the molten glass was cast onto a carbon plate, shaped into a plate, and then gradually cooled at a temperature near the annealing point for 30 minutes.
- the coefficient of thermal expansion, density, strain point, annealing point, softening point, temperature at high temperature viscosity 10 4.0 dPa ⁇ s, temperature at high temperature viscosity 10 3.0 dPa ⁇ s, high temperature viscosity 10 The temperature, Young's modulus, and specific Young's modulus at 2.5 dPa ⁇ s were evaluated. It should be noted that some of the glass properties are not actual measurement values but estimated values calculated from past data.
- the coefficient of thermal expansion is a value obtained by measuring the average coefficient of thermal expansion in the temperature range of 30 to 380 ° C with a dilatometer.
- the density is a value measured by the well-known Archimedes method.
- strain point, annealing point, and softening point are the values measured based on the method of ASTM C336 and C338.
- the temperature at a high temperature viscosity of 10 4.0 dPa ⁇ s, 10 3.0 dPa ⁇ s, and 10 2.5 dPa ⁇ s is a value measured by a platinum ball pulling method.
- Young's modulus is a value measured by the bending resonance method.
- Specific Young's modulus is a value obtained by dividing Young's modulus by density.
- the sample No. Nos. 1 to 391 did not contain Y 2 O 3 and La 2 O 3 in the glass composition, and had a strain point of 650 ° C. or higher. Therefore, the sample No. It is considered that 1 to 391 are suitable for a carrier glass that holds a substrate for forming a TFT circuit or a resin substrate for forming a TFT circuit in a flat panel display such as a liquid crystal display and an organic EL display.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
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- Ceramic Engineering (AREA)
- Glass Compositions (AREA)
Abstract
Description
β-OH値=(1/X)log(T1/T2)
X:板厚(mm)
T1:参照波長3846cm-1における透過率(%)
T2:水酸基吸収波長3600cm-1付近における最小透過率(%)
Claims (6)
- ガラス組成として、モル%で、SiO2 60~74%、Al2O3 6~20%、B2O3 0~9%、MgO 1~13%、CaO 1~13%、SrO 0~7%、BaO 0~8%、Y2O3+La2O3 0~1.0%未満を含有し、実質的にアルカリ金属酸化物を含有せず、歪点が650℃以上であることを特徴とする無アルカリガラス板。
- SrO+BaOの含有量が0~3モル%であることを特徴とする請求項1に記載の無アルカリガラス板。
- 歪点が700℃以上であることを特徴とする請求項1又は2に記載の無アルカリガラス板。
- ヤング率が79GPa以上であることを特徴とする請求項1~3の何れかに記載の無アルカリガラス板。
- 熱膨張係数が30×10‐7~45×10‐7/℃であることを特徴とする請求項1~4の何れかに記載の無アルカリガラス板。
- 高温粘度102.5dPa・sにおける温度が1600℃以下であることを特徴とする請求項1~5の何れかに記載の無アルカリガラス板。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311311334.6A CN117263517A (zh) | 2018-10-17 | 2019-10-07 | 无碱玻璃板 |
| US17/283,108 US12122715B2 (en) | 2018-10-17 | 2019-10-07 | Alkali-free glass plate |
| KR1020217014583A KR20210077729A (ko) | 2018-10-17 | 2019-10-07 | 무알칼리 유리판 |
| CN201980066358.5A CN112805256A (zh) | 2018-10-17 | 2019-10-07 | 无碱玻璃板 |
| CN202410156363.8A CN118084324A (zh) | 2018-10-17 | 2019-10-07 | 无碱玻璃板 |
| US18/888,588 US20250011219A1 (en) | 2018-10-17 | 2024-09-18 | Alkali-free glass plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-195522 | 2018-10-17 | ||
| JP2018195522A JP7478340B2 (ja) | 2018-10-17 | 2018-10-17 | 無アルカリガラス板 |
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| Application Number | Title | Priority Date | Filing Date |
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| US17/283,108 A-371-Of-International US12122715B2 (en) | 2018-10-17 | 2019-10-07 | Alkali-free glass plate |
| US18/888,588 Continuation US20250011219A1 (en) | 2018-10-17 | 2024-09-18 | Alkali-free glass plate |
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| JP (2) | JP7478340B2 (ja) |
| KR (1) | KR20210077729A (ja) |
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|---|---|---|---|---|
| JPWO2021261446A1 (ja) * | 2020-06-25 | 2021-12-30 | ||
| CN117295698A (zh) * | 2021-05-10 | 2023-12-26 | 日本电气硝子株式会社 | 无碱玻璃板 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020162604A1 (ja) * | 2019-02-07 | 2020-08-13 | Agc株式会社 | 無アルカリガラス |
| KR20250130307A (ko) * | 2022-12-26 | 2025-09-01 | 니폰 덴키 가라스 가부시키가이샤 | 무알칼리 유리판 |
| WO2025134864A1 (ja) * | 2023-12-21 | 2025-06-26 | 日本電気硝子株式会社 | 無アルカリガラス板 |
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Also Published As
| Publication number | Publication date |
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| JP7478340B2 (ja) | 2024-05-07 |
| JP2020063168A (ja) | 2020-04-23 |
| CN112805256A (zh) | 2021-05-14 |
| TWI913695B (zh) | 2026-02-01 |
| JP2024074996A (ja) | 2024-05-31 |
| CN118084324A (zh) | 2024-05-28 |
| US20250011219A1 (en) | 2025-01-09 |
| TWI913218B (zh) | 2026-02-01 |
| TW202017882A (zh) | 2020-05-16 |
| US20210380469A1 (en) | 2021-12-09 |
| US12122715B2 (en) | 2024-10-22 |
| CN117263517A (zh) | 2023-12-22 |
| TW202430481A (zh) | 2024-08-01 |
| KR20210077729A (ko) | 2021-06-25 |
| JP7712605B2 (ja) | 2025-07-24 |
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