WO2016170931A1 - 強化ガラス - Google Patents
強化ガラス Download PDFInfo
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- WO2016170931A1 WO2016170931A1 PCT/JP2016/060023 JP2016060023W WO2016170931A1 WO 2016170931 A1 WO2016170931 A1 WO 2016170931A1 JP 2016060023 W JP2016060023 W JP 2016060023W WO 2016170931 A1 WO2016170931 A1 WO 2016170931A1
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- tempered glass
- glass
- compressive stress
- dol
- stress layer
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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
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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
-
- 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
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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
-
- 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
-
- 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
- C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
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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
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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
- C03C3/078—Glass compositions containing silica with 40% to 90% silica, by weight containing an oxide of a divalent metal, e.g. an oxide of zinc
Definitions
- the present invention relates to a tempered glass, and more particularly to a tempered glass suitable for a cover glass of a mobile terminal such as a mobile phone, a smartphone or a tablet terminal.
- Mobile terminals such as mobile phones, smartphones, and tablet terminals are becoming increasingly popular.
- tempered glass tempered by ion exchange treatment or the like is used.
- the tempered glass mounted on a smartphone or the like breaks, it can be roughly divided into “surface crack” having a starting point on the surface and “end surface crack” having a starting point on the end surface, depending on the difference in the occurrence of the crack.
- the surface cracking will be described in detail.
- mode 2 There is a mode (mode 2) that can be broken.
- the cover glass breaks due to the fall of a smartphone or the like, but there are various fall patterns, and it is required to have high resistance to any crack mode.
- Patent Document 2 refers to mode 1 cracking as slow crack cracking, and proposes that the chemical strengthening treatment process be performed twice with a heat treatment step so that a tempered glass having high resistance to the cracking is obtained. .
- the tempered glass thus produced has a position (HW) at which the half value of the compressive stress value is present in the vicinity of the surface of the compressive stress layer.
- Patent Document 1 focuses on preventing occurrence of mode 1 cracks, and mode 2 cracks are not fully considered.
- two chemical strengthening steps and one heat treatment step are required, the cost is high and time is required, and it is difficult to stabilize the quality.
- An object of the present invention is to provide a tempered glass that is resistant to surface cracking in any mode and has good productivity.
- the present inventors have determined that the stress is designed so that the compressive stress value at a depth of about 20 ⁇ m from the surface is sufficiently high, even in a single chemical strengthening step. It was found that sufficient resistance to cracking can be obtained. However, mode 1 cracks are more likely to occur as the internal tensile stress value (CT) of the tempered glass increases, so increasing the crack resistance of mode 2 increases the internal tensile stress value and causes mode 1 cracks to occur. It becomes easy. This tendency becomes more prominent as the plate thickness decreases. Therefore, the present inventors have conducted further studies and found that the crack resistance of both modes can be achieved at a high level by managing the depth of the compressive stress layer to a certain ratio or less of the plate thickness, and propose the present invention. It came.
- the internal tensile stress value is a value obtained from the following equation 1 using the compressive stress value CS [MPa], the compressive stress layer depth DOL [ ⁇ m], and the plate thickness t [ ⁇ m].
- the tempered glass of the present invention is a tempered glass having a plate thickness of 0.6 mm or less and having a compressive stress layer formed by chemical strengthening on the surface.
- the compressive stress value of the compressive stress layer is CS [MPa]
- the compressive stress is When the layer depth is DOL [ ⁇ m] and the plate thickness is t [ ⁇ m], the condition of CS ⁇ (DOL-20) / DOL> 360 [MPa] and DOL / t ⁇ 0.20 is satisfied. It is characterized by.
- the compressive stress value CS and the depth DOL of the compressive stress layer indicate values measured with a glass surface stress meter FMS-6000LE manufactured by Orihara Seisakusho.
- CS ⁇ (DOL ⁇ 20) / DOL means a value obtained by multiplying CS by a value obtained by subtracting 20 from DOL and dividing the value obtained by this by DOL.
- the plate thickness is preferably 0.5 mm or less.
- the internal stress value tends to increase and the possibility of mode 1 cracking increases. Therefore, if the above configuration is adopted, the effect of applying the present invention can be easily enjoyed.
- the compressive stress value is preferably 500 to 1200 MPa, and the depth of the compressive stress layer is preferably 25 to 60 ⁇ m.
- the chemically strengthened glass is chemically strengthened by one chemical strengthening treatment.
- the glass composition is SiO 2 50-80%, Al 2 O 3 8-30%, B 2 O 3 0-6%, Li 2 O 0-2%, Na 2 O 5 by mass%. It is preferable to contain ⁇ 25%, MgO 0 ⁇ 10%, P 2 O 5 0 ⁇ 15%.
- the tempered glass preferably satisfies the following conditions.
- P320 sandpaper sand paper is placed so that the rubbing surface is in contact with tempered glass), tempered glass, and 4 mm thick acrylic plate
- the average height at the time of breaking the tempered glass should be 43 cm or more.
- P320 sandpaper means one defined by JIS R6252.
- Average height means the average height of 30 samples.
- the tempered glass has extremely high crack resistance in mode 2.
- the tempered glass preferably satisfies the following conditions.
- the number of pieces of broken tempered glass should be 80 or less on average.
- P100 sandpaper means that specified in JIS R6252.
- the “average number of fragments” means the average number of fragments in the number of damaged samples.
- the mobile terminal cover glass of the present invention is characterized by comprising the above-described tempered glass.
- the tempered glass of the present invention has a mode (mode 1) in which a scratch having a sharp protrusion hits the glass surface and breaks through the compressive stress layer, and a crack that does not hit the compressive stress layer by hitting the glass surface.
- mode 1 a mode in which a scratch having a sharp protrusion hits the glass surface and breaks through the compressive stress layer, and a crack that does not hit the compressive stress layer by hitting the glass surface.
- mode 2 in which cracks occur and break can be achieved at a high level. Therefore, it is suitable as a cover glass for a smartphone or the like where the glass is easily damaged due to various causes.
- the tempered glass of the present invention can be produced by a single tempering treatment, it is possible to reduce the manufacturing cost, simplify the process, and reduce the burden of quality control.
- FIG. It is the schematic explaining the test method which evaluates the crack of mode 2.
- FIG. It is the schematic explaining the test method which evaluates the crack of mode 1.
- FIG. It is a graph which shows the evaluation result of an Example.
- the tempered glass of the present invention has a compressive stress layer on its surface.
- a method for forming a compressive stress layer on the surface there are a physical tempering method and a chemical tempering method.
- the tempered glass of the present invention is formed by a chemical tempering method.
- the chemical strengthening method is a method of introducing alkali ions having a large ion radius to the surface of the glass by ion exchange treatment at a temperature below the strain point of the glass. If the compressive stress layer is formed by the chemical strengthening method, the compressive stress layer can be properly formed even when the glass plate thickness is small. Like the physical tempering method such as the tempering method, the tempered glass is not easily broken.
- the compressive stress value CS and the depth DOL of the compressive stress layer are in a relationship of CS ⁇ (DOL-20) / DOL> 360.
- CS ⁇ (DOL ⁇ 20) / DOL represents the magnitude of compressive stress at a depth of 20 ⁇ m from the surface.
- the reason for limiting the magnitude of the compressive stress at a depth of 20 ⁇ m from the surface is as follows. When the depth of scratches on the surface of the cover glass was investigated for 180 smartphones whose cover glasses were not damaged, the maximum depth of the scratches was 20 ⁇ m. In addition, none of the confirmed scratches penetrated the compressive stress layer.
- the preferable range of the value of CS ⁇ (DOL-20) / DOL is 370 or more, 380 or more, particularly 390 or more. If this value is too small, the crack resistance of mode 2 is lowered. On the other hand, when this value increases, CS and DOL increase, and as understood from Equation 1, the internal tensile stress CT increases. In particular, when the plate thickness t is small, CT becomes remarkably large, and the risk of mode 1 cracking increases. For these reasons, the upper limit of the value of CS ⁇ (DOL-20) / DOL is preferably 500 or less, 450 or less, 440 or less, 430 or less, 425 or less, particularly 420 or less.
- the tempered glass of the present invention has a relationship of DOL / t ⁇ 0.20.
- DOL / t indicates the ratio of the depth of the compressive stress layer (one side) to the plate thickness.
- CT increases as CS and DOL increase.
- the ratio of DOL to the plate thickness is strictly regulated so that CT does not become too large.
- the preferable range of DOL / t is 0.17 or less, 0.15 or less, particularly 0.13 or less. If the DOL is too thin, mode 2 cracks are likely to occur, so the lower limit of DOL / t is preferably 0.04 or more, 0.05 or more, particularly 0.05 or more.
- the tempered glass of the present invention has a plate thickness of 0.6 mm or less, preferably 0.5 mm or less, more preferably less than 0.5 mm, further preferably 0.45 mm or less, and particularly preferably 0.4 mm or less.
- the plate thickness decreases, it becomes easier to reduce the weight and thickness of mobile terminals and the like. Further, as the plate thickness is reduced, as described above, CT tends to increase and mode 1 cracking tends to occur. Therefore, the effect of the present invention that can enhance mode 1 crack resistance can be enjoyed. It becomes easy.
- the lower limit of the plate thickness is preferably 0.1 mm or more, particularly 0.2 mm or more.
- the compressive stress value CS of the compressive stress layer is preferably 500 MPa or more, 540 MPa or more, 600 MPa or more, particularly 670 MPa or more.
- the greater the compressive stress value the higher the mechanical strength of the tempered glass.
- the crack resistance of mode 2 is increased.
- the compressive stress value of the compressive stress layer is preferably 1200 MPa or more, 1000 MPa or less, 900 MPa or less, particularly 850 MPa or less.
- the compressive stress value tends to increase. Further, if the ion exchange time is shortened or the temperature of the ion exchange solution is lowered, the compressive stress value tends to increase.
- the depth DOL of the compressive stress layer is preferably 25 ⁇ m or more, 28 ⁇ m or more, 30 ⁇ m or more, particularly 35 ⁇ m or more.
- the depth of the compressive stress layer increases, the cracks formed on the surface are less likely to penetrate the compressive stress layer, so that the crack resistance of mode 1 is improved.
- the greater the depth of the compressive stress layer the higher the tensile stress CT inherent in the tempered glass, and there is a risk of self-destruction. Moreover, it becomes difficult to cut
- the depth of the compressive stress layer tends to increase.
- the ion exchange time is lengthened or the temperature of the ion exchange solution is increased, the depth of the compressive stress layer tends to increase.
- the internal tensile stress value CT obtained by Equation 1 is preferably 200 MPa or less, 150 MPa or less, 130 MPa or less, particularly 108 MPa or less.
- the lower the internal tensile stress value the higher the resistance to self-destruction and mode 1 cracking.
- the tempered glass of the present invention is preferably tempered by one chemical tempering treatment.
- tempered glass that has been subjected to two or more chemical strengthening treatment steps is not excluded, but when the chemical strengthening treatment step is performed twice or more, the manufacturing cost increases. Also, process and quality management becomes difficult.
- whether or not the chemical strengthening treatment has been performed a plurality of times is determined based on whether the cross section of the chemically strengthened glass is a microscope type wide-range birefringence evaluation system (Photonic Lattice WPA-micro) or a birefringence imaging system (manufactured by Tokyo Instruments). (Abrio), and it may be determined by whether or not the bending point of the stress profile exists.
- the glass composition is not particularly limited, but by mass%, SiO 2 50-80%, Al 2 O 3 8-30%, B 2 O 3 0-6%, Li
- a glass composition containing 2 O 0-2%, Na 2 O 5-25%, MgO 0-10%, and P 2 O 5 0-15% is preferred.
- the reason for limiting the content range of each component in this way is shown below.
- SiO 2 is a component that forms a network of glass.
- the content of SiO 2 is 50 to 80%, preferably 55 to 75%, preferably 56 to 72%, preferably 56 to 70%, particularly preferably 57 to 67%. If the content of SiO 2 is too small, vitrification becomes difficult, and the thermal expansion coefficient becomes too high, so that the thermal shock resistance tends to decrease. On the other hand, if the content of SiO 2 is too large, the meltability and moldability tend to be lowered, and the thermal expansion coefficient becomes too low to make it difficult to match the thermal expansion coefficient of the surrounding materials.
- Al 2 O 3 is a component that improves ion exchange performance, and is a component that increases the strain point and Young's modulus.
- the content of Al 2 O 3 is 8 to 30%, preferably 10 to 28%, preferably 14 to 25%, particularly preferably 16 to 22%.
- the content of Al 2 O 3 is too small, resulting is a possibility which can not be sufficiently exhibited ion exchange performance.
- the content of Al 2 O 3 is too large, devitrification crystal glass becomes easy to precipitate, and it becomes difficult to mold the glass sheet by an overflow down draw method or the like.
- B 2 O 3 is a component that lowers the high temperature viscosity and density, stabilizes the glass, makes it difficult to precipitate crystals, and lowers the liquidus temperature.
- the content of B 2 O 3 is 0 to 10%, preferably 0 to 8%, preferably 0.05 to 6%, particularly preferably 0.1 to 3%.
- the content of B 2 O 3 is too large, the ion exchange, the coloring may occur in the glass surface, called burnt, water resistance is lowered, likely thickness of the compression stress layer is reduced.
- Li 2 O is an ion exchange component, and is a component that lowers the high-temperature viscosity to increase the meltability and moldability, and also increases the Young's modulus. Furthermore, Li 2 O has a large effect of increasing the compressive stress value among alkali metal oxides. However, in a glass system containing 7% or more of Na 2 O, if the Li 2 O content is extremely increased, the compressive stress is rather increased. The value tends to decrease. Further, when the content of Li 2 O is too large, and decreases the liquidus viscosity, in addition to the glass tends to be devitrified, the thermal expansion coefficient becomes too high, the thermal shock resistance may decrease, It becomes difficult to match the thermal expansion coefficient of the surrounding material.
- the content of Li 2 O is 0 to 2%, preferably 0 to 1.5%, preferably 0 to 1%, preferably 0 to 0.5%, preferably 0 to 0.1%, Particularly preferred is 0 to 0.05%.
- Na 2 O is an ion exchange component, and is a component that lowers the high temperature viscosity and improves the meltability and moldability. Na 2 O is also a component that improves devitrification resistance.
- the content of Na 2 O is 5 to 25%, preferably 7 to 20%, preferably 10 to 18%, particularly preferably 12 to 18%.
- the thermal expansion coefficient becomes too high, the thermal shock resistance is lowered, and it becomes difficult to match the thermal expansion coefficient of the surrounding materials.
- the strain point may be excessively lowered or the component balance of the glass composition may be lost, and the devitrification resistance may be deteriorated.
- MgO is a component that lowers the viscosity at high temperature, increases meltability and moldability, and increases the strain point and Young's modulus.
- MgO is a component that has a large effect of improving ion exchange performance. is there. Therefore, the content of MgO is 0 to 10%, preferably 0.1 to 8%, preferably 1 to 6%, preferably 1.2 to 4%, particularly preferably 2 to 3.5%. .
- a density and a thermal expansion coefficient will become high easily and there exists a tendency for glass to devitrify easily. In particular, when a glass plate is formed by an overflow downdraw method using an alumina molded body, spinel devitrified crystals are likely to precipitate at the interface with the alumina molded body.
- P 2 O 5 is a component that enhances ion exchange performance, and in particular, a component that increases the thickness of the compressive stress layer.
- the content of P 2 O 5 is 0 to 15%, preferably 0 to 10%, preferably 0 to 3%, preferably 0 to 1%, particularly preferably 0 to 0.5%.
- K 2 O is a component that promotes ion exchange, and among alkali metal oxides, it is a component that tends to increase the thickness of the compressive stress layer. Moreover, it is a component which reduces high temperature viscosity and improves a meltability and a moldability. Furthermore, it is also a component that improves devitrification resistance. However, if the content of K 2 O is too large, the thermal expansion coefficient becomes too high, and the thermal shock resistance is lowered or it is difficult to match the thermal expansion coefficient of the surrounding materials. Moreover, there is a tendency that the strain point is excessively lowered, the component balance of the glass composition is lacking, and the devitrification resistance is lowered. Therefore, the content of K 2 O is preferably 0 to 10%, preferably 0 to 8%, preferably 0 to 5%, particularly preferably 0 to 3%.
- the content of CaO is preferably 0 to 6%, preferably 0 to 4%, preferably 0 to 2%, preferably 0 to 1%, preferably 0 to 0.5%, particularly preferably 0 to 0.1%.
- the SrO content is preferably 0 to 2%, preferably 0 to 1%, preferably 0 to 0.5%, particularly preferably 0 to 0.1%.
- BaO is a component that lowers the high-temperature viscosity to increase meltability and moldability, and increases the strain point and Young's modulus.
- the content of BaO is preferably 0 to 6%, preferably 0 to 3%, preferably 0 to 1.5%, preferably 0 to 1%, preferably 0 to 0.5%, particularly preferably. 0 to 0.1%.
- TiO 2 is a component that enhances ion exchange performance and a component that lowers the high-temperature viscosity. However, if its content is too large, the glass tends to be colored or devitrified. Therefore, the content of TiO 2 is preferably 0 to 4.5%, more preferably 0 to 0.5%, and particularly preferably 0 to 0.3%.
- ZrO 2 is a component that remarkably improves the ion exchange performance, and is a component that increases the viscosity and strain point near the liquid phase viscosity. However, if its content is too large, the devitrification resistance may be significantly reduced. There is also a possibility that the density becomes too high. Therefore, the content of ZrO 2 is preferably 0 to 5%, preferably 0 to 4%, preferably 0 to 3%, particularly preferably 0.001 to 2%.
- ZnO is a component that enhances ion exchange performance, and is a component that is particularly effective in increasing the compressive stress value. Moreover, it is a component which reduces high temperature viscosity, without reducing low temperature viscosity.
- the content of ZnO is preferably 0 to 6%, preferably 0 to 5%, preferably 0 to 3%, particularly preferably 0 to 1%.
- one or two or more selected from the group of Cl, SO 3 and CeO 2 may be added in an amount of 0 to 3%.
- the SnO 2 content is preferably 0 to 3%, preferably 0.01 to 3%, preferably 0.05 to 3%, preferably 0.1 to 3%, particularly preferably 0.2 to 3%. 3%.
- the content of Fe 2 O 3 is preferably less than 1000 ppm (less than 0.1%), preferably less than 800 ppm, preferably less than 600 ppm, preferably less than 400 ppm, particularly preferably less than 300 ppm.
- Rare earth oxides such as Nd 2 O 3 and La 2 O 3 are components that increase the Young's modulus.
- the cost of the raw material itself is high, and when it is added in a large amount, the devitrification resistance tends to be lowered.
- the content of the rare earth oxide is preferably 3% or less, preferably 2% or less, preferably 1% or less, preferably 0.5% or less, and particularly preferably 0.1% or less.
- the tempered glass of the present invention preferably contains substantially no As 2 O 3 , Sb 2 O 3 , PbO, F, or Bi 2 O 3 as a glass composition from the environmental consideration.
- substantially does not contain As 2 O 3 means that the glass component does not positively add As 2 O 3 but allows mixing at the impurity level. This means that the content of As 2 O 3 is less than 0.1% by mass.
- substantially free of Sb 2 O 3 but not added actively Sb 2 O 3 as a glass component, a purpose to allow the case to be mixed with impurity levels, specifically, Sb 2 It indicates that the content of O 3 is less than 0.1% by mass.
- “Substantially no PbO” means that PbO is not actively added as a glass component, but is allowed to be mixed at an impurity level. Specifically, the content of PbO is 0.1. It means less than mass%. “Substantially no F” means that F is not actively added as a glass component, but is allowed to be mixed at an impurity level. Specifically, the content of F is 0.1. It means less than mass%. By “substantially free of Bi 2 O 3", but not added actively Bi 2 O 3 as a glass component, a purpose to allow the case to be mixed as an impurity, specifically, Bi 2 O 3 indicates that the content is less than 0.05%.
- the tempered glass of the present invention preferably satisfies the following conditions.
- the tempered glass G and the acrylic plate 14 having a thickness of 4 mm are stacked in this order, and 110 g of the steel ball B1 is dropped on the acrylic plate 5.
- the height at which the steel ball B1 is dropped is gradually increased, and the height at which the tempered glass G breaks is evaluated. When this test is performed, the average height when the tempered glass G is broken should be 43 cm or more.
- This test is suitable for evaluation of crack resistance in mode 2 (a mode in which a blunt protrusion hits the glass surface and a crack that does not break through the compressive stress layer occurs and breaks). If tempered glass having a thickness of 0.6 mm or less satisfies the condition of CS ⁇ (DOL-20) / DOL> 360, it is possible to ensure practically usable resistance against mode 2 cracking. When satisfying, it can be judged that it has higher tolerance.
- the steel ball is dropped from a height of 15 cm, and when the tempered glass is not broken, the drop height of the steel ball is increased by 5 cm. In this way, the test is performed while changing the height until the tempered glass breaks.
- the height at which the tempered glass is broken is recorded, the height at which the broken glass is broken is Weibull plotted, and a value at which the fracture probability is 63% is calculated as an average value.
- the number of samples is 30. Note that unstrengthened glass and glass with a small degree of strengthening may not be divided even if cracks occur. In this case, it is determined that the crack has entered the vertical direction when the crack reaches a depth of more than half of the plate thickness.
- the tempered glass of the present invention preferably satisfies the following conditions.
- tempered glass G and P100 sandpaper 22 are arranged on the base 21 made of granite in order of 4 g.
- the steel ball B2 is dropped onto the sandpaper 22 from a height of 5 cm, and the number of broken pieces of the tempered glass G is evaluated.
- the number of broken pieces of tempered glass G should be 80 or less (preferably 50 or less, particularly 20 or less) on average.
- P100 sandpaper means that specified in JIS R6252.
- the tempered glass G has a size of 65 mm ⁇ 130 mm. The number of samples is 30.
- This test is suitable for evaluation of crack resistance in mode 1 (a mode in which a sharp protrusion hits the glass surface and a crack that breaks through the compressive stress layer occurs and breaks). If tempered glass having a plate thickness of 0.6 mm or less satisfies the condition of DOL / t ⁇ 0.20, it is possible to ensure practically usable resistance against mode 1 cracking. Further, it can be judged to have high tolerance.
- the manufacturing method of the glass of this invention is not limited to this.
- the glass raw material prepared so as to have the above glass composition is put into a continuous melting furnace, heated and melted at 1500 to 1600 ° C., clarified, fed into a molding apparatus, shaped into a plate shape, etc.
- a glass plate etc. can be produced by cooling.
- the overflow down-draw method is a method that can produce a high-quality glass plate in large quantities, and can easily produce a large glass plate, and it is easy to increase the virtual temperature Tf of the glass plate.
- alumina or dense zircon is used as a molded body.
- the tempered glass of the present invention has good compatibility with alumina and dense zircon, particularly alumina (it is difficult to react with the molded body to generate bubbles, blisters, etc.).
- a forming method such as a float method, a downdraw method (slot down method, redraw method, etc.), a rollout method, a press method, or the like can be employed.
- the tempered glass is produced by chemically tempering the obtained tempered glass.
- Chemical strengthening may be performed by adjusting the type of molten salt, the mixing ratio of the salt, the temperature of the molten salt, and the treatment time so as to satisfy the various conditions described above.
- the tempered glass may be before the tempering treatment or after the tempering treatment.
- Table 1 shows composition examples (glasses a to h) of the glass used in this example.
- Glass raw materials were prepared so as to have the composition of glass a, and melted at 1600 ° C. for 8 hours using a platinum pot. Thereafter, the obtained molten glass was poured onto a carbon plate, formed into a plate shape, slowly cooled, and then polished on both sides so as to have a plate thickness of 0.4 mm.
- Example Nos. 1 to 3 The glass a obtained in this way was subjected to a chemical strengthening treatment to obtain a sample.
- Table 2 shows Examples (Sample Nos. 1 to 3) and Comparative Examples (Sample Nos. 4 to 7) of the present invention.
- each sample was subjected to ion exchange treatment under the conditions shown in Table 2 after optical polishing on both surfaces.
- the content ratio of NaNO 3 in the table shows the percentage of the molten salt, the remainder of the molten salt is KNO 3.
- the compression stress value (CS) of the compressive stress layer on the surface and the depth (DOL) of the compressive stress layer from the number of interference fringes observed using a surface stress meter (FSM-6000LE manufactured by Orihara Seisakusho) was calculated.
- the refractive index of each sample was 1.51, and the optical elastic constant was 30 [(nm / cm) / MPa].
- the number of pieces of broken tempered glass G was counted. This test was performed 30 times for samples having the same composition, and the average number of fragments at the time of breaking the tempered glass sample was calculated. In this test, if the number of broken pieces of the tempered glass G is 20 or less on average, it can be determined that the glass has sufficient resistance to mode 1 cracking.
- the tempered glass of the present invention is suitable as a cover glass for mobile terminals such as mobile phones, smartphones, and tablet terminals.
- the tempered glass of the present invention can be applied to cover glasses for digital cameras, etc., glass substrates for displays (particularly touch panel displays), substrates for magnetic disks, cover glasses for solid-state image sensors, and the like. I can expect.
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Abstract
Description
即ち、本発明の強化ガラスは、板厚が0.6mm以下であり、化学強化による圧縮応力層を表面に有する強化ガラスであって、圧縮応力層の圧縮応力値をCS[MPa]、圧縮応力層の深さをDOL[μm] 、板厚をt[μm]としたときに、CS×(DOL-20)/DOL>360[MPa]、且つDOL/t≦0.20の条件を満たすことを特徴とする。なお本発明において圧縮応力値CS及び圧縮応力層の深さDOLは、折原製作所製ガラス表面応力計FMS-6000LEで測定した値を指す。「CS×(DOL-20)/DOL」とは、CSに、DOLから20引いた値を乗じた上で、これによって得られた値をDOLで除した値を意味する。
深さにおける圧縮応力の大きさを十分に高くすればよいとの知見を得た。そしてCS×(DOL-20)/DOLの値が360を超えれば、後述するP360のサンドペーパーを用いた鋼球落下試験において、市販されている化学強化を2回施したカバーガラスよりも割れにくくなることが明らかになった。これらの事実から、モード2の割れ耐性は、CS×(DOL-20)/DOLの値が360を超えることが重要であると結論付けた。
また各試料について、モード1の割れ耐性を以下の試験方法で評価した。まず図2に示すように、花崗岩からなる基台上21に強化ガラスG、P100のサンドペーパー22(サンドペーパー22は擦り面が強化ガラスGと接触するように配置)の順序で配置し、4gの鋼球B2を5cmの高さからサンドペーパー22上に落下させた。続いて破壊した強化ガラスGの破片数を計数した。同一組成の試料についてこの試験を30回行い、強化ガラス試料の破壊時の平均破片数を算出した。この試験において、破壊した強化ガラスGの破片数が平均で20個以下となれば、モード1の割れに対して十分な耐性を有していると判断できる。
12、14 アクリル板
13、22 サンドペーパー
B1、B2 鋼球
G 強化ガラス
Claims (8)
- 板厚が0.6mm以下であり、化学強化による圧縮応力層を表面に有する強化ガラスであって、圧縮応力層の圧縮応力値をCS[MPa]、圧縮応力層の深さをDOL[μm]、板厚をt[μm]としたときに、CS×(DOL-20)/DOL>360、且つDOL/t≦0.20の条件を満たすことを特徴とする強化ガラス。
- 板厚が0.5mm以下であることを特徴とする請求項1に記載の強化ガラス。
- 圧縮応力値が500~1200MPa、圧縮応力層の深さが25~60μmであることを特徴とする請求項1又は2の何れかに記載の強化ガラス。
- 1回の化学強化処理で化学強化されてなることを特徴とする請求項1~3の何れかに記載の強化ガラス。
- 表面に圧縮応力層を有する強化ガラスであって、ガラス組成として、質量%で、SiO2 50~80%、Al2O3 8~30%、B2O3 0~6%、Li2O 0~2%、Na2O 5~25%、MgO 0~10%、P2O5 0~15%を含有することを特徴とする請求項1~4の何れかに記載の強化ガラス。
- 以下の条件を満たすことを特徴とする請求項1~5の何れかに記載の強化ガラス。
SUS定盤からなる基台上に、板厚4mmのアクリル板、P320のサンドペーパー、強化ガラス、板厚4mmのアクリル板の順序で積層配置し、110gの鋼球を前記積層体上に落下させ、強化ガラスが破壊する高さを評価する試験において、強化ガラスの破壊時の平均高さが43cm以上となること。ここでサンドペーパーは擦り面が強化ガラスと接触するように配置する。 - 以下の条件を満たすことを特徴とする請求項1~6の何れかに記載の強化ガラス。
花崗岩からなる基台上に強化ガラス、P100のサンドペーパーの順序で配置し、4gの鋼球を5cmの高さからサンドペーパー上に落下させ、破壊した強化ガラスの破片数を評価する試験において、破壊した強化ガラスの破片数が平均で80個以下となること。ここでサンドペーパーは擦り面が強化ガラスと接触するように配置する。 - 請求項1~7の何れかの強化ガラスからなることを特徴とするモバイル端末用カバーガラス。
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JP7492681B2 (ja) | 2019-12-23 | 2024-05-30 | 日本電気硝子株式会社 | 強化ガラスの強度測定方法 |
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US10633279B2 (en) | 2017-11-29 | 2020-04-28 | Corning Incorporated | Glasses with low excess modifier content |
CN109052934B (zh) * | 2018-10-16 | 2020-06-19 | 四川旭虹光电科技有限公司 | 具有抗冲击应力特性的保护玻璃板 |
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JP6675592B2 (ja) | 2020-04-01 |
US20180118615A1 (en) | 2018-05-03 |
CN107531563B (zh) | 2021-04-16 |
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TW201733946A (zh) | 2017-10-01 |
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