WO2013042739A1 - 強化用ガラス板 - Google Patents
強化用ガラス板 Download PDFInfo
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- WO2013042739A1 WO2013042739A1 PCT/JP2012/074089 JP2012074089W WO2013042739A1 WO 2013042739 A1 WO2013042739 A1 WO 2013042739A1 JP 2012074089 W JP2012074089 W JP 2012074089W WO 2013042739 A1 WO2013042739 A1 WO 2013042739A1
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- Prior art keywords
- glass
- mol
- expansion coefficient
- strengthening
- glass plate
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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
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B27/00—Tempering or quenching glass products
- C03B27/04—Tempering or quenching glass products using gas
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B27/00—Tempering or quenching glass products
- C03B27/04—Tempering or quenching glass products using gas
- C03B27/0413—Stresses, e.g. patterns, values or formulae for flat or bent glass sheets
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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
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31—Surface property or characteristic of web, sheet or block
- Y10T428/315—Surface modified glass [e.g., tempered, strengthened, etc.]
Definitions
- the present invention relates to a tempered glass plate that can be tempered as much as or more than conventional soda lime glass even when the thickness is thin, and a tempered glass plate that is tempered from the glass plate.
- Tempered glass has been used for vehicles and buildings for the purpose of improving the drawback of glass that is easily broken.
- the tempered glass referred to in the present invention is a tempered glass using heat shrinkage of glass called thermal tempering or physical tempering, and is used for windows of vehicles such as passenger cars, trucks, buses, railways, ships, aircrafts, and the like.
- thermal tempering or physical tempering a tempered glass using heat shrinkage of glass
- tempered glass used for headlights and taillights tempered glass used for windows, doors, and show windows in buildings and houses, furniture and office supplies such as partitions, desktops, bookshelves, and showcases Tempered glass used for home appliances such as tempered glass and cooking utensils.
- a glass plate manufactured by the float method or the like is heated to a temperature near the softening point or yield point temperature, and then air is blown to the surface of the glass plate to rapidly cool it or wind. It is manufactured by a method called a cold strengthening method.
- This method uses the thermal shrinkage of the glass during cooling by air blowing, and the glass surface is shrunk by gradually cooling after shrinking and shrinking first, so that compressive stress remains on the glass surface, The strength of the glass is improved. Further, tempered glass has an effect of improving scratch resistance because it has an effect of suppressing the progress of scratches attached to the glass surface because compressive stress remains on the surface.
- the reduction in density of glass it is about 2.5 g / cm 3 at room temperature for soda lime silica glass produced by a float process generally used as a reinforcing glass plate.
- the density was about 2.2 g / cm 3 , and there was a limit to reducing the density.
- glass thinning is known as a technology that can overcome the strength reduction for thinning the glass, but in the heat strengthening of glass, the temperature difference between the glass surface and the inside during cooling is utilized.
- a thin glass with a thickness of 2.8 mm or less hardly causes a temperature difference and is difficult to strengthen.
- the glass plate to be heat strengthened has a linear thermal expansion coefficient at a high temperature near the yield point when the temperature difference near the yield point where the heat strengthening starts and the temperature near the strain point where the strain is frozen are large. When it is large, it is preferable that strengthening easily proceeds.
- such a glass has a large coefficient of linear thermal expansion from a low temperature, so that it is not suitable when it is desired that the coefficient of linear thermal expansion at a relatively low temperature is desired depending on the application.
- Patent Document 1 discloses a glass that can be tempered even when the glass is thin. That is, by setting the glass composition within a specific range and setting the average coefficient of linear thermal expansion of glass at 50 to 350 ° C. to 80 to 110 ⁇ 10 ⁇ 7 / ° C., deformation of the glass in the cooling step after heating is suppressed. However, it is disclosed that the stress generated by strengthening can be increased. However, in order to obtain a glass that is more easily tempered, it is effective to control the linear thermal expansion coefficient in the vicinity of the tempering temperature (for example, the yield point) and increase the value of the stress generated by the tempering. A technique for simultaneously optimizing the linear thermal expansion coefficient in the temperature region has not been known.
- the present invention is a tempered glass sheet that can increase the linear thermal expansion coefficient at high temperatures while suppressing the linear thermal expansion coefficient particularly at low temperatures, so that the stress generated by thermal strengthening is high and can be sufficiently strengthened even when thin. And a tempered glass sheet strengthened using the same.
- the present invention contains at least B 2 O 3 as a component of the glass composition in the composition in the range of 12.5 to 35 mol% and selected from the group consisting of MgO, CaO, BaO, Na 2 O and K 2 O.
- the difference [XY] between the total X of the content of these compounds in the composition and the content Y of B 2 O 3 in the composition is in the range of ⁇ 5 to 10 mol%.
- It is a glass sheet for strengthening, which is subjected to a strengthening process by heating and quenching.
- the present invention is a glass composition containing, in oxide reference notation, B 2 O 3 , SiO 2 , and Na 2 O, and at least one selected from the group consisting of CaO, BaO, MgO, and K 2 O.
- the content of B 2 O 3 is 12.5 to 35 mol%
- the content of B 2 O 3 is Y
- the contained Na 2 O, K 2 O , CaO, BaO, and MgO where the total content of each component is X, the difference in content between X and Y [XY] is in the range of ⁇ 5 to 10 mol%
- the difference [ ⁇ 2 ⁇ 1 ] between the average linear expansion coefficient ⁇ 1 at 50 to 350 ° C. and the linear expansion coefficient ⁇ 2 at a temperature intermediate between the glass transition point and the yield point is 450 ⁇ 10 ⁇ 7.
- It is a glass plate for strengthening as described above, characterized by being at / ° C or higher.
- the present invention also provides the above-described glass sheet for strengthening, wherein the average linear expansion coefficient ⁇ 1 at 50 to 350 ° C. is 30 ⁇ 10 ⁇ 7 / ° C. or more and less than 100 ⁇ 10 ⁇ 7 / ° C. is there.
- the linear expansion coefficient ⁇ 2 at a temperature intermediate between the glass transition point and the yield point is 500 ⁇ 10 ⁇ 7 / ° C. or more and 1300 ⁇ 10 ⁇ 7 / ° C. or less. It is a glass plate for strengthening.
- this invention is a tempered glass board characterized by the tempering process being performed by heating and quenching the above-mentioned tempering glass board, and the generated stress after a tempering process being 35 MPa or more.
- the term “to” indicating the above numerical range is used in the sense that the numerical values described before and after it are used as the lower limit value and the upper limit value. Unless otherwise specified, “to” is the same in the following specification. Used with meaning.
- a glass sheet for strengthening is obtained that has a characteristic of a small coefficient of thermal expansion in a relatively low temperature range and can obtain a sufficiently high surface compressive stress by a conventional thermal strengthening process. be able to.
- a tempered glass having excellent scratch resistance and a very light weight can be obtained.
- the reinforcing glass plate of the present invention preferably has an average linear thermal expansion coefficient ⁇ 1 of 50 to 350 ° C. of less than 100 ⁇ 10 ⁇ 7 / ° C.
- the average linear thermal expansion coefficient ⁇ 1 is 100 ⁇ 10 ⁇ 7 / ° C. or more, various problems may occur depending on the intended use of the tempered glass sheet. For example, in a manufacturing process of laminated glass for automobiles, a dimensional change due to a temperature difference becomes large, and defects are likely to occur. Further, when the temperature rises suddenly from a low temperature, tensile stress is generated on the glass surface, and cracking is likely to occur.
- a more preferable range of the average linear thermal expansion coefficient ⁇ 1 is less than 90 ⁇ 10 ⁇ 7 / ° C.
- the temperature is more preferably less than 85 ⁇ 10 ⁇ 7 / ° C., and preferably less than 80 ⁇ 10 ⁇ 7 / ° C. Particularly preferred.
- the glass sheet for strengthening of the present invention preferably has an average linear thermal expansion coefficient ⁇ 1 of 50 to 350 ° C. of 30 ⁇ 10 ⁇ 7 / ° C. or more. If it is less than 30 ⁇ 10 ⁇ 7 / ° C., the stress generated by physical strengthening may be difficult to increase. More preferably, it is 60 ⁇ 10 ⁇ 7 / ° C. or more, and particularly preferably 70 ⁇ 10 ⁇ 7 / ° C. or more.
- the glass plate for strengthening of the present invention preferably has a glass transition temperature (hereinafter, “glass transition temperature” is also simply referred to as “glass transition temperature”) of 750 ° C. or less.
- glass transition temperature is also simply referred to as “glass transition temperature”
- the glass transition point exceeds 750 ° C., it is necessary to increase the temperature for strengthening. Therefore, when the glass plate is tempered, peripheral members such as members and jigs for holding the glass plate are exposed to high temperatures. Therefore, there is a possibility that a problem such as a problem that the life of the peripheral member is remarkably reduced or an expensive member having excellent heat resistance is required as the peripheral member.
- the glass transition point is 700 ° C. or lower.
- a glass transition point is 400 degreeC or more.
- the glass transition point is less than 400 ° C., a temperature difference due to heating / cooling is difficult to be applied in the glass plate during strengthening, so that the stress generated by the strengthening may be reduced. More preferably, the glass transition point is 450 ° C. or higher, more preferably 500 ° C. or higher.
- the glass plate for strengthening of the present invention preferably has a yield point temperature (hereinafter, “glass yield point temperature” is simply referred to as “glass yield point”) of 640 ° C. or higher. If the temperature is lower than 640 ° C., the strengthening start temperature is lowered, and the stress generated by the strengthening may be reduced. More preferably, it is 660 degreeC or more.
- the tempered glass plate of the present invention preferably has a yield point of 750 ° C. or lower. When the yield point exceeds 750 ° C., it is necessary to increase the temperature for strengthening, and therefore, when strengthening the glass plate, peripheral members such as members holding the glass plate and jigs are exposed to high temperatures. There is a possibility that a problem such as a problem that the life of the peripheral member is remarkably reduced or an expensive member excellent in heat resistance is required. More preferably, the yield point is 700 ° C. or lower.
- the linear expansion coefficient ⁇ 2 at a temperature intermediate between the glass transition point and the yield point is preferably 500 ⁇ 10 ⁇ 7 / ° C. or more.
- the temperature between the glass transition point and the yield point refers to a temperature of (temperature of glass transition point + temperature of yield point) / 2.
- the linear expansion coefficient ⁇ 2 is less than 500 ⁇ 10 ⁇ 7 / ° C., the stress generated by strengthening may be reduced. More preferably, the linear expansion coefficient ⁇ 2 is 600 ⁇ 10 ⁇ 7 / ° C. or more, and more preferably 700 ⁇ 10 ⁇ 7 / ° C. or more.
- the linear expansion coefficient ⁇ 2 is preferably 1300 ⁇ 10 ⁇ 7 / ° C. or less.
- the linear expansion coefficient ⁇ 2 exceeds 1300 ⁇ 10 ⁇ 7 / ° C., when the glass plate is rapidly cooled for strengthening, a tensile stress is temporarily generated near the surface, but the stress is too large and the glass is broken. Such a problem occurs, which is not preferable.
- the linear expansion coefficient ⁇ 2 is 1250 ⁇ 10 ⁇ 7 / ° C. or lower, more preferably 1200 ⁇ 10 ⁇ 7 / ° C. or lower.
- the temperatures of the glass transition point and the yield point described above vary depending on the composition of the glass plate and cannot be generally called. For example, the glass transition point is 560 ° C. to 620 ° C., and the temperature of the yield point is 620 ° C. ° C to 680 ° C.
- the reinforcing glass plate of the present invention has a difference between an average linear thermal expansion coefficient ⁇ 1 at 50 to 350 ° C. and a thermal expansion coefficient ⁇ 2 at a temperature intermediate between the glass transition point and the yield point [ ⁇ 2 ⁇ 1 ]. Is preferably 450 ⁇ 10 ⁇ 7 / ° C. or higher.
- [ ⁇ 2 - ⁇ 1 ] represents the difference between the linear expansion coefficient at a high temperature during heating and the linear expansion coefficient at a low temperature during cooling. It is an indicator of When [ ⁇ 2 - ⁇ 1 ] is less than 450 ⁇ 10 ⁇ 7 / ° C., the stress generated by strengthening may be reduced. More preferably, it is 500 ⁇ 10 ⁇ 7 / ° C. or more, and further preferably 550 ⁇ 10 ⁇ 7 / ° C. or more.
- the reinforcing glass plate of the present invention preferably has a density at room temperature of less than 2.75 g / cm 3 . At 2.75 g / cm 3 or more, the glass itself becomes heavy. In addition, since glass having a low density tends to have a low thermal conductivity, it has a feature that stress is easily applied during thermal strengthening. More preferably, it is less than 2.70 g / cm ⁇ 3 >, More preferably, it is less than 2.65 g / cm ⁇ 3 >.
- strengthening of this invention is demonstrated.
- Each component is expressed in mol%.
- the composition of the reinforcing glass plate of the present invention is as follows in terms of the following oxide standard.
- B 2 O 3 12.5 to 35 mol%
- SiO 2 50 to 85 mol%
- Al 2 O 3 0 to 20 mol%
- B 2 O 3 has the effect of improving the durability of the glass.
- the glass plate of the present invention contains B 2 O 3 in the range of 12.5 to 35 mol% in the glass composition.
- B 2 O 3 is less than 12.5 mol%, sufficient compressive stress cannot be obtained on the glass surface due to thermal strengthening. More preferably, it is 13.5 mol% or more, More preferably, it is 14.5 mol% or more.
- the content of B 2 O 3 exceeds 35 mol%, the glass is likely to undergo phase separation, the chemical durability of the glass is reduced, and the lifetime of the kiln is shortened by the volatile acid of boric acid. Challenges arise. More preferably, it is 30 mol% or less, More preferably, it is 25 mol% or less.
- the content of SiO 2 is preferably 50 mol% or more. If it is less than 50 mol%, problems such as an increase in the coefficient of thermal expansion in the low temperature range, deterioration in scratch resistance, and excessively low glass transition temperature occur. More preferably, it is 55 mol% or more, More preferably, it is 60 mol% or more. Further, the content of SiO 2 in the glass plate of the present invention is preferably not more than 85 mol%. When the content of SiO 2 exceeds 85 mol%, the viscosity becomes high and the glass becomes difficult to dissolve. More preferably, it is 80 mol% or less, More preferably, it is 75 mol% or less.
- Na 2 O is a component that greatly increases the expansion coefficient in the high temperature region without increasing the expansion coefficient in the low temperature region when the content thereof is moderate.
- the Na 2 O content of the glass plate of the present invention preferably at least 12.5 mol%, more preferably more than: 14 mol%, more preferably at least 15 mol%.
- As the Na 2 O content of the glass plate of the present invention preferably not more than 30 mol%. When it exceeds 30 mol%, the temperature difference between the strain point and the yield point becomes small, and the stress generated by strengthening becomes small. Another problem is that the thermal expansion coefficient becomes too large. More preferably, it is 25 mol% or less, More preferably, it is 22.5 mol% or less.
- K 2 O is a component that greatly increases the expansion coefficient in the high temperature region without increasing the expansion coefficient in the low temperature region when the content thereof is moderate.
- the K 2 O content of the glass plate of the present invention is preferably 0 to 30 mol%. More preferably, it is 12.5 mol% or more, More preferably, it is 14 mol% or more. Further, when the content of K 2 O of the glass plate of the present invention is more than 30 mol%, it is likely to occur a problem expansion coefficient of the low-temperature region too high. More preferably, it is 25 mol% or less, More preferably, it is 22.5 mol% or less.
- CaO has the feature of increasing the thermal expansion coefficient of glass at high temperatures.
- the CaO content of the glass plate of the present invention is preferably 0 to 10 mol%.
- content of CaO of the glass plate of this invention More preferably, it is 1 mol% or more, More preferably, it is 3 mol% or more, More preferably, it is 5 mol% or more.
- CaO content of the glass plate of this invention exceeds 10 mol%, glass will phase-separate and will devitrify. Also, the problem of not melting is likely to occur. More preferably, it is 9 mol% or less, More preferably, it is 8 mol% or less.
- BaO like CaO
- the BaO content of the glass plate of the present invention exceeds 10 mol%, problems such as increase in specific gravity of the glass and devitrification tend to occur. More preferably, it is 9 mol% or less, More preferably, it is 8 mol% or less, Most preferably, it is 7 mol% or less.
- MgO has the feature of maintaining the thermal expansion coefficient of glass moderately.
- content of MgO of the glass plate of this invention Preferably they are 0 mol% or more and 5 mol% or less.
- Al 2 O 3 is a component that improves the durability of the glass and is not an essential component in the glass plate of the present invention, but can be appropriately added to the component within a range of 20 mol% or less.
- the glass sheet for strengthening of the present invention consists essentially of the above components, but may contain other components within a range not impairing the object of the present invention.
- the other components for example, ZnO, SrO, Li 2 O , Fe 2 O 3, FeO, ZrO 2, TiO 2, Y 2 O 3, may contain such CeO 2.
- SO 3 chlorides, fluorides, halogen, SnO 2, Sb 2 O 3 , As 2 O 3 and the like may also contain appropriate.
- you may contain Ni, Co, Cr, Mn, V, Se, Au, Ag, Cd, Cu, Ge, etc. for color adjustment.
- the reinforcing glass plate of the present invention contains B 2 O 3 in the composition in the range of 12.5 to 35 mol% as a component of the glass composition, and is selected from MgO, CaO, BaO, Na 2 O and K 2 O.
- the difference [XY] between the total content X in the composition of the obtained compounds and the content Y of B 2 O 3 in the composition is in the range of ⁇ 5 to 10 mol%.
- [XY] is outside the range of ⁇ 5 to 10 mol%, it is difficult to obtain a thermal expansion coefficient suitable for strengthening.
- B 2 O 3 is contained in the composition in the range of 12.5 to 35 mol%
- [XY] is in the range of ⁇ 2.5 to 5 mol%.
- the glass sheet for strengthening of the present invention is expressed in oxide standard, and is at least one selected from the group consisting of B 2 O 3 , SiO 2 , and Na 2 O, and further CaO, BaO, MgO, and K 2 O.
- the total content of each component of 2 O, K 2 O, CaO, BaO, and MgO is X
- the difference in content between X and Y [XY] is in the range of ⁇ 5 to 10 mol% Is within.
- the linear thermal expansion coefficient, glass transition point, and yield point of the strengthening glass plate are measured as follows. Create a cylindrical sample having a diameter of 5 mm, length 20 mm, using a thermal expansion meter as measured at a heating rate of 5 ° C. / min, average linear expansion coefficient alpha 1 in 50 ⁇ 350 ° C., a glass transition point, the yield point The thermal expansion coefficient ⁇ 2 at a temperature intermediate between the glass transition point and the yield point is obtained.
- the glass plate for strengthening of the present invention preferably has a plate thickness of 1.0 mm or more. If the thickness is less than 1.0 mm, the surface compressive stress generated by strengthening may not increase. More preferably, it is 1.4 mm or more, More preferably, it is 1.8 mm or more.
- the glass sheet for strengthening of the present invention may be produced by any method such as a float method, a fusion method, a download method, and a roll-out method.
- the float process is more preferable because it is easy to mass-produce plate glass having a size of 1.3 mm or more in a large area and to easily reduce the plate thickness deviation.
- the tempered glass plate made of the tempered glass plate of the present invention preferably has a Young's modulus of 70 GPa or more. When it is 70 GPa or more, there is an effect that the breaking strength tends to be higher. More preferably, it is 75 GPa or more.
- the tempered glass plate made of the tempered glass plate of the present invention preferably has a photoelastic constant of 3.5 ⁇ 10 ⁇ 7 cm 2 / kg or less. If it exceeds 3.5 ⁇ 10 ⁇ 7 cm 2 / kg, color unevenness tends to occur when it is used for a display cover glass or when the luminance is adjusted by polarization. More preferably, it is 3.2 ⁇ 10 ⁇ 7 cm 2 / kg or less.
- the tempered glass plate made of the tempered glass plate of the present invention preferably has a generated stress of 35 MPa or more.
- the generated stress refers to a surface compressive stress generated on the surface of the tempered glass plate.
- the generated stress in the tempered glass sheet of the present invention is measured in the following manner. A disc having a dimension of ⁇ 20 mm ⁇ 5 mm (t) and a mirror surface is produced from the slowly cooled glass. A photoelastic constant is obtained by a disk compression method using the produced disk. Next, the disk-shaped samples were suspended one by one in a platinum crucible using a platinum wire and held at a temperature 125 ° C. higher than the glass transition point for 10 minutes.
- the platinum crucible used at this time has a cylindrical shape with a diameter of about 6 cm and a height of about 10 cm, and the glass is positioned substantially at the center inside the crucible. After heating, the glass is taken out together with the crucible, and the glass is quenched by quenching with the crucible in the air. The retardation of the prepared quenched glass is measured with a strain inspection machine (manufactured by Toshiba). Further, the generated stress is obtained by dividing the retardation value by the photoelastic constant. When the generated stress obtained in this way is less than 35 MPa, the glass plate is not sufficiently strengthened, and there is a risk that the glass plate will break, and the size of fragments generated when cracked does not become 15 mm or less. This is not preferred because it tends to cause problems. More preferably, it is 40 MPa or more, More preferably, it is 45 MPa or more.
- Commonly used glass materials such as carbonates and nitrates were appropriately selected and weighed and mixed so as to give 500 g of glass. After that, the mixture is put into a platinum crucible, put into a resistance heating electric furnace at 1450 ° C., melted for 1 hour, poured into a mold material, soaked in a container filled with water and subjected to water granulation, and then into pieces of 15 mm or less. Crushed.
- the fragments are put again in a platinum crucible, melted for 2 hours, defoamed, poured into a mold, held at a temperature about 30 ° C. higher than the glass transition point for 1 hour, and then cooled at a rate of 1 ° C. per minute.
- the glass was cooled to room temperature to prepare slowly cooled glass.
- a cylindrical sample (glass rod) having a diameter of 5 mm and a length of 20 mm is produced from the produced glass, and a thermal dilatometer (TD5010SA, manufactured by Bruker AXS Co., Ltd.) is used.
- the glass transition point was determined by measuring at a heating rate of 5 ° C./min.
- a yield point was determined by applying a weight of 10 g to the glass rod and measuring the temperature at the time when the glass rod started to shrink.
- a sample with a thickness of about 10 mm is prepared by polishing the glass so that both sides of a 4 cm ⁇ 4 cm glass plate are parallel, and the density is obtained by the Archimedes method, and the Young's modulus is obtained by the ultrasonic pulse method. It was.
- the stress generated by the strengthening process of heating and quenching was measured.
- a disk-shaped glass having a size of ⁇ 20 mm ⁇ 5 mm (t) and a mirror surface was produced from annealed glass.
- the photoelastic constant was calculated
- the disk-shaped glass samples were suspended one by one in a platinum crucible using a platinum wire and held at a temperature 125 ° C. higher than the glass transition point for 10 minutes.
- the platinum crucible used at this time was a cylinder having a diameter of about 6 cm and a height of about 10 cm, and the glass was positioned substantially at the center inside the crucible.
- the reinforcing glass plate according to the present invention includes at least one oxide selected from the group consisting of MgO, CaO, BaO, Na 2 O, and K 2 O contained as the glass composition.
- the difference [X ⁇ Y] between the total content X and the content Y of B 2 O 3 is in the range of ⁇ 5 to 10 mol%, and the average linear thermal expansion coefficient ⁇ 1 at 50 to 350 ° C. Is suppressed to less than 100 ⁇ 10 ⁇ 7 / ° C., but the linear expansion coefficient ⁇ 2 in the high temperature region between the glass transition point and the yield point is as high as 500 ⁇ 10 ⁇ 7 / ° C.
- the difference [ ⁇ 2 ⁇ 1 ] between the expansion coefficient ⁇ 1 and the linear expansion coefficient ⁇ 2 is not less than 450 ⁇ 10 ⁇ 7 / ° C. Therefore, the tempered glass sheet is heated to near its softening point or yield point temperature. Then, by physical strengthening by the air cooling strengthening method that rapidly cools High incidence stress that more than 35MPa can be obtained.
- the glass plate of the present invention is a tempered glass for windows of vehicles such as passenger cars, trucks, buses, railroads, ships, aircraft, etc., tempered glass for headlights and taillights, buildings and residential windows, doors, show windows, etc.
- tempered glass Used for tempered glass, furniture such as partitions, desktops, bookshelves, showcases, tempered glass for office supplies, and tempered glass for home appliances such as cooking utensils.
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Abstract
Description
また、本発明は、酸化物基準表記で、B2O3、SiO2、およびNa2Oと、さらにCaO、BaO、MgOおよびK2Oからなる群から選ばれる少なくとも1種を含有するガラス組成を有し、当該ガラス組成においてB2O3の含有量は、12.5~35mol%であり、前記B2O3の含有量をYとし、前記した含有されるNa2O、K2O、CaO、BaO、およびMgOの各成分の含有量の合計をXとしたとき、XとYとの含有量の差[X-Y]が、-5~10mol%の範囲内であり、加熱および急冷することによる強化加工に供されることを特徴とする強化用ガラス板である。
また、本発明は、50~350℃おける平均線膨脹係数α1が、30×10-7/℃以上、100×10-7/℃未満であることを特徴とする前記した強化用ガラス板である。
また、本発明は、ガラス転移点と屈伏点の中間の温度における線膨脹係数α2が、500×10-7/℃以上、1300×10-7/℃以下であることを特徴とする前記した強化用ガラス板である。
上記した数値範囲を示す「~」とは、その前後に記載された数値を下限値および上限値として含む意味で使用され、特段の定めがない限り、以下本明細書において「~」は、同様の意味をもって使用される。
なお、上記したガラス転移点および屈伏点の温度は、ガラス板の組成によって変わり、一概に謂うことはできないが、例えば、ガラス転移点は560℃~620℃であり、また屈伏点の温度は620℃~680℃である。
本発明の強化用ガラス板の組成は、下記酸化物基準表記で以下の通りである。
B2O3:12.5~35 mol%、
SiO2:50~85 mol%、
Na2O:12.5~30 mol%、
K2O:0~30 mol%、
CaO:0~10 mol%、
BaO:0~10 mol%、
MgO:0~5 mol%、
Al2O3:0~20 mol%、
また、本発明の強化用ガラス板は、酸化物基準表記で、B2O3、SiO2、およびNa2Oと、さらにCaO、BaO、MgO、およびK2Oからなる群から選ばれる少なくとも1種を含有するガラス組成を有し、当該ガラス組成においてB2O3の含有量は、12.5~35mol%であり、前記B2O3の含有量をYとし、前記した含有されるNa2O、K2O、CaO、BaO、およびMgOの各成分の含有量の合計をXとしたとき、XとYとの含有量の差[X-Y]が、-5~10mol%の範囲内である。
表1のmol%で示すガラス組成(本発明の実施例)となるように、また表2のmol%で示すガラス組成(本発明の比較例)となるように、酸化物、水酸化物、炭酸塩、硝酸塩等、一般的に使用されるガラス原料を適宜選択し、ガラスとして500gとなるように秤量および混合した。その後、混合物を白金るつぼに入れ、1450℃の抵抗加熱式電気炉に投入し、1時間溶融し、型材に流し込み、水を張った容器に漬けて水砕を行った後に、15mm以下の破片に砕いた。次いでこの破片を再び白金るつぼに入れて2時間溶融し、脱泡した後、型材に流し込み、ガラス転移点から約30℃高い温度にて1時間保持した後、毎分1℃の冷却速度にて室温まで冷却し、徐冷ガラスを作製した。
なお、2011年9月22日に出願された日本特許出願2011-207710号の明細書、特許請求の範囲、図面および要約書の全内容をここに引用し、本発明の開示として取り入れるものである。
Claims (6)
- ガラス組成の成分として、B2O3を12.5~35mol%の範囲で組成中に含み、かつMgO、CaO、BaO、Na2OおよびK2Oからなる群から選ばれる少なくとも1種の化合物を含み、組成中のこれらの化合物の含有量の合計Xと、組成中のB2O3の含有量Yとの差[X-Y]が、-5~10mol%の範囲内であり、加熱および急冷することによる強化加工に供されることを特徴とする強化用ガラス板。
- ガラス組成の成分として、酸化物基準表記で、B2O3、SiO2、およびNa2Oと、さらにCaO、BaO、MgO、およびK2Oからなる群から選ばれる少なくとも1種を含有するガラス組成を有し、当該ガラス組成においてB2O3の含有量は、12.5~35mol%であり、前記B2O3の含有量をYとし、前記した含有されるNa2O、K2O、CaO、BaO、およびMgOの各成分の含有量の合計をXとしたとき、XとYとの含有量の差[X-Y]が、-5~10mol%の範囲内であり、加熱および急冷することによる強化加工に供されることを特徴とする請求項1に記載の強化用ガラス板。
- 50~350℃おける平均線膨脹係数α1と、ガラス転移点と屈伏点の中間の温度における線膨脹係数α2の差[α2-α1]が450×10-7/℃以上であることを特徴とする請求項1または2に記載の強化用ガラス板。
- 50~350℃おける平均線膨脹係数α1が、30×10-7/℃以上、100×10-7/℃未満であることを特徴とする請求項1乃至3のいずれか1項に記載の強化用ガラス板。
- ガラス転移点と屈伏点の中間の温度における線膨脹係数α2が、500×10-7/℃以上、1300×10-7/℃以下であることを特徴とする請求項1乃至3のいずれか1項に記載の強化用ガラス板。
- 請求項1乃至5のいずれか1項に記載の強化用ガラス板を、加熱および急冷することによって強化加工が施され、強化加工後の発生応力が35MPa以上であることを特徴とする強化ガラス板。
Priority Applications (4)
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US14/223,534 US20140242391A1 (en) | 2011-09-22 | 2012-09-20 | Glass plate to be tempered |
EP12833239.2A EP2759522A4 (en) | 2011-09-22 | 2012-09-20 | GLASS PLATE FOR TEMPERED |
JP2013534749A JP6020455B2 (ja) | 2011-09-22 | 2012-09-20 | 強化用ガラス板 |
CN201280045822.0A CN103827051A (zh) | 2011-09-22 | 2012-09-20 | 强化用玻璃板 |
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EP (1) | EP2759522A4 (ja) |
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WO2017082311A1 (ja) * | 2015-11-10 | 2017-05-18 | 旭硝子株式会社 | 風冷強化用ガラス、および風冷強化ガラス |
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US10611664B2 (en) | 2014-07-31 | 2020-04-07 | Corning Incorporated | Thermally strengthened architectural glass and related systems and methods |
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