A method for testing the degree of crystallization of glass and a method for preparing glass

Abstract

The present invention discloses a method for testing the crystallization degree of glass and a method for preparing glass, comprising the following steps: Step 1: Obtain a heat flow Q - temperature T curve graph of the glass by using a synchronous thermal analyzer, and determine T pbmin , T Q , Q s and Q max according to the crystallization peak region of the glass in the graph; wherein, T pbmin is the lowest temperature at which crystallization starts in the crystallization peak region of the glass; T Q is the temperature corresponding to when Q reaches the maximum value; Q s is the Q value when the glass starts to crystallize; Q max is the maximum value of the Q value; calculate h = Q max - Q s ; Step 2: Calculate the crystallization degree: P = |h| × (dQ / dT) avg ; in the formula, differentiate the crystallization peak region from T pbmin to T Q to obtain n dQ / dT, and n is not less than 100; (dQ / dT) avg is the average value of n dQ / dT.

Description

Technical Field

[0001] The present application relates to the technical field of glass, and particularly relates to a method for testing the degree of crystallization of glass and a method for preparing glass. Background Art

[0002] Ion-exchanged strengthened glass is widely used in the field of electronic displays due to its excellent characteristics such as high transmittance, high hardness, high strength, light weight, and thinness. Lithium aluminosilicate is one of the more widely used types in the current glass field. Compared with high-aluminum silicon glass, lithium aluminosilicate glass has a similar network structure to high-aluminum silicon glass, but in terms of composition, two kinds of alkali metal ions, sodium and lithium, are introduced at the same time, and binary ion exchange of sodium-lithium and potassium-sodium (referred to as double strengthening for short) can be carried out simultaneously to form a composite compressive stress layer.

[0003] Currently, in the method for preparing glass, the float process is widely used in the production of double-strengthened glass in the fields of consumer electronics, aviation, and high-speed rail due to its advantages of large production tonnage and the ability to produce thick glass. When using the float process to produce double-strengthened glass, two aspects of the glass itself need to be considered. One is the viscosity-temperature property of the glass, and the other is the crystallization property of the glass. Since each section of the float process has a corresponding viscosity, the viscosity-temperature property of the glass affects the temperature corresponding to each section of the float process during glass production. On the one hand, this affects the temperature control ability and energy consumption of each section of the float line body, and on the other hand, it also limits the crystallization property of the glass. During the production process of the float line, the glass is in a flowable viscoelastic state before entering the annealing furnace, which may cause the molecules in the glass to phase-separate and crystallize, resulting in defects such as stones and devitrification in the glass during production, and further causing the glass to be unable to be produced normally. In addition, when producing thick glass, the molten glass liquid has a slow flow rate and a long residence time in the tin bath section when leaving the chevron brick and the first pair of edge rollers, and the risk of crystallization may increase. Therefore, it is necessary to make the upper crystallization temperature of the glass lower than a certain temperature, so that when the glass stays in the tin bath section, it will not have a crystallization tendency because the temperature is higher than the upper crystallization temperature. However, in the existing glass production, when controlling the forming of the glass, the temperature of the glass liquid in the tin bath will inevitably be lower than its upper crystallization temperature, and there is a risk of crystallization. Therefore, it is necessary to control the degree of crystallization of the glass, including the crystallization rate, the number and volume of crystal growth, so that even when the glass liquid stays in the tin bath section with a temperature lower than the upper crystallization temperature, due to the low degree of crystallization of the glass, it is not enough to precipitate large grains that affect glass production.

[0004] In the prior art, there is currently no method to characterize the entire degree of crystallization during the crystallization process of glass, and it is even more impossible to intuitively, efficiently, accurately, and quantitatively characterize the degree of crystallization of glass. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a method for testing the degree of crystallization of glass and a method for preparing glass, so as to solve the technical problem that the prior art cannot intuitively, efficiently, accurately and quantify the degree of crystallization.

[0006] In order to solve the above technical problems, in a first aspect, the present application provides a method for testing the crystallization degree of glass, comprising the following steps:

[0007] Step 1: Use a synchronous thermal analyzer to obtain the heat flow Q-temperature T curve of the glass, and determine T according to the crystallization peak area of ​​the glass in the figure. pbmin 、T Q , Q s and Q max ; Among them, T pbmin It is the lowest temperature at which the glass starts to crystallize in the crystallization peak region; T Q is the temperature corresponding to when Q reaches its maximum value; Q s Q is the Q value when the glass starts to crystallize; max is the maximum value of Q value;

[0008] Calculate h = Q max -Q s ;

[0009] Step 2: Calculate the degree of crystallization:

[0010] P = 丨h丨×(dQ / dT) avg

[0011] In the formula, the crystallization peak area is from T pbmin to T Q Differentiate to obtain n dQ / dT, where n is not less than 100; (dQ / dT) avg is the average value of n dQ / dT.

[0012] In some embodiments, the test temperature in the test method ranges from 30 to 900°C.

[0013] In some embodiments, the heating rate in the test method is 1-15° C. / min.

[0014] In some embodiments, the test method is used to test the degree of crystallization during the glass preparation process.

[0015] In some embodiments, the glass comprises lithium aluminosilicate glass.

[0016] In a second aspect, the present application provides a method for preparing glass, comprising the following steps: in the process of preparing the glass, obtaining glass of different thicknesses by controlling the crystallization degree P of the glass; the crystallization degree P is 0 to 8×10 -3 w2 g -2 ℃ -1 The degree of crystallization P is obtained by testing according to the testing method for the degree of crystallization of a glass as described above; the thickness t of the glass is 0.1 - 8 mm.

[0017] In some embodiments, calculated in terms of mole percentage of oxides, the glass comprises the following components:

[0018] SiO2 is 50 - 80%,

[0019] Al2O3 is 10 - 20%,

[0020] Na2O is 2 - 10%,

[0021] Li2O is 1 - 15%,

[0022] K2O is 0 - 5%,

[0023] MgO is 0 - 10%,

[0024] ZrO2 is 0 - 5%,

[0025] CaO is 0 - 5%,

[0026] La2O3 is 0 - 3%,

[0027] Y2O3 is 0 - 3%.

[0028] In some embodiments, the upper crystallization temperature of the glass is 1000 - 1200 °C.

[0029] In some embodiments, the viscosity of the glass in the forming stage is 10 3.6 dPa·s - 10 6.80 dPa·s, preferably 10 3.93 dPa·s - 10 6.80 dPa·s, more preferably 10 3.93 dPa·s - 10 6.60 dPa·s.

[0030] In some embodiments, the viscosity of the glass in the forming stage is 10 3.6 dPa·s - 10 6.80 dPa·s, and the residence time at this viscosity is 20 min - 45 min, preferably 20 min - 43 min.

[0031] In some embodiments, when the degree of crystallization P of the glass during the preparation process is ≤ 7.22×10 -3 w 2 g -2 ℃ -1 , glass with a thickness ≤ 1 mm can be produced.

[0032] In some embodiments, when the degree of crystallization P of the glass during preparation is ≤ 1.12×10 -3 w 2 g -2 ℃ -1 , glass with a thickness ≤ 3 mm can be produced.

[0033] In some embodiments, when the degree of crystallization P of the glass during preparation is ≤ 1.0×10 -3 w 2 g -2 ℃ -1 , glass with a thickness ≤ 8 mm can be produced.

[0034] In some embodiments, the glass is lithium aluminosilicate glass.

[0035] In a third aspect, the present application provides an application of the glass prepared by the preparation method as described above in mobile phone back covers, electronic terminals, decorative pieces, handicrafts, jewelry or portable digital devices.

[0036] In a fourth aspect, a consumer electronic product includes: a housing including a front surface, a back surface and side surfaces; electronic components at least partially located within the housing, the electronic components including at least a controller, a memory and a display, the display being located at the front surface of the housing or adjacent to the front surface of the housing; and a cover glass disposed on the display, wherein at least a part of the housing includes the glass prepared by the glass preparation method as described above or its strengthened glass after strengthening.

[0037] In a fifth aspect, an electronic device includes the glass prepared by the preparation method as described above or its strengthened glass after strengthening.

[0038] Compared with the prior art, the present application has the following beneficial effects:

[0039] 1. The detection method for the degree of crystallization of the test glass in the present application can accurately, efficiently and quantitatively characterize the degree of crystallization of the glass during preparation, thus solving the problem in the prior art that it is difficult to quantitatively characterize the degree of crystallization of the glass.

[0040] 2. The present application can test the degree of crystallization of the glass by adjusting the glass composition, and then control the production thickness of the glass in actual production by controlling different degrees of crystallization. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is the DSC curve graph of Examples 1-2 and Comparative Examples 1, 3-4.

[0042] Figure 2Optical microscope observation diagram of the crystallization situation of Example 1 during the actual crystallization experiment.

[0043] Figure 3 Optical microscope observation diagram of the crystallization situation of Example 2 during the actual crystallization experiment.

[0044] Figure 4 Optical microscope observation diagram of the crystallization situation of Comparative Example 1 during the actual crystallization experiment.

[0045] Figure 5 Optical microscope observation diagram of the crystallization situation of Comparative Example 3 during the actual crystallization experiment.

[0046] Figure 6 Optical microscope observation diagram of the crystallization situation of Comparative Example 4 during the actual crystallization experiment. Detailed implementation manners

[0047] This application will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on this application belong to the scope of protection of this application.

[0048] Unless otherwise specified in specific circumstances in this application, the numerical ranges listed herein include the upper and lower limit values, as well as all integers and fractions within that range, rather than the specific values listed when defining the range. As used herein, "and / or" is inclusive. For example, "A and / or B" means only A, only B, or both A and B.

[0049] In a first aspect, this application provides a method for testing the crystallization degree of glass, including the following steps:

[0050] Step 1: Use a synchronous thermal analyzer to obtain a heat flow Q - temperature T curve graph of the glass, and determine T pbmin 、T Q 、Q s and Q max ; where T pbmin is the lowest temperature at which crystallization starts in the crystallization peak region of the glass; T Q is the temperature corresponding to when Q reaches the maximum value; Q s is the Q value when the glass starts to crystallize; Q max is the maximum value of the Q value;;

[0051] Calculate h = Q max -Q s ;

[0052] Step 2: Calculate the crystallization degree:

[0053] P = |h|×(dQ / dT) avg

[0054] In the formula, for the crystallization peak region from T pbmin to T Q perform differentiation to obtain n dQ / dT values, and n is not less than 100; (dQ / dT) avg is the average value of the n dQ / dT values.

[0055] In this application, when the glass is being formed, there will be a situation where its temperature is lower than the upper limit temperature of crystallization of the glass, and a crystallization tendency will occur. When the glass crystallizes, heat is released, and an almost symmetric exothermic peak will appear on the heat flow Q - temperature T curve of the DSC test. It is found in this application that the factors related to the crystallization process of the glass include the crystallization rate and the number of crystal growths; and the degree of crystallization characterizing the entire crystallization process of the glass is only related to the crystallization rate and the number of crystal growths. On the exothermic peak of the DSC test, differentiating the change of the heat flow Q with respect to the temperature T, that is, dQ / dT, can characterize the change rate of the heat flow; and further characterize the speed of the glass crystallization. In addition, the maximum value h of the heat release during the glass crystallization process can characterize the fastest crystallization rate when the number of crystal growths is the largest. Therefore, the degree of crystallization here refers to the comprehensive characterization of the number of precipitated crystals and the speed of crystallization. Using the absolute value |h| of dQ / dT and the maximum value h of the heat release to describe the crystallization process of the glass can completely represent the degree of crystallization of the glass. In addition, the faster the glass crystallization rate, the better the crystals in the glass will grow, and thus the more the number of crystals; therefore, dQ / dT and |h| have a positive correlation with the degree of crystallization of the glass. Since dQ / dT on the exothermic peak has a value close to infinity; therefore, (dQ / dT) avg can be used to characterize the average change rate of crystallization for substitution. And using the product of (dQ / dT) avg and |h| can completely represent the amount of the degree of crystallization in the glass crystallization process.

[0056] Therefore, by combining the use of dQ / dT and the maximum value h of the heat release (here using its absolute value |h| to ensure a positive value for easy comparison as an analysis index), a comprehensive description of the glass crystallization process can be provided. Through the method described in this application, not only can the crystallization behavior of the glass under different conditions be quantitatively analyzed, but also the degree of crystallization of the glass can be systematically and completely characterized, providing an important basis for subsequent glass material design and process optimization.

[0057] In some embodiments, the temperature range for testing in the testing method is 30 to 900 °C. In some embodiments, the testing temperature in the testing method is adjusted according to the composition of the glass to be tested. For glasses with different compositions, the testing temperatures are also different. For example, the temperature range for testing can be 30 °C, 50 °C, 100 °C, 200 °C, 400 °C, 500 °C, 800 °C, 900 °C, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0058] In some embodiments, the heating rate in the testing method is 1 - 15 °C / min. In some embodiments, the heating rate in the testing method can be 1 °C / min, 2 °C / min, 3 °C / min, 4 °C / min, 5 °C / min, 6 °C / min, 7 °C / min, 8 °C / min, 9 °C / min, 10 °C / min, 11 °C / min, 12 °C / min, 13 °C / min, 14 °C / min, 15 °C / min, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0059] In some embodiments, the testing method is used to test the degree of crystallization during the glass preparation process. The glass preparation method is not limited here, and the implementation of the testing method is not affected by the glass preparation method. Any method can understand the degree of crystallization during the glass preparation process through the testing method.

[0060] In some embodiments, the glass includes lithium aluminosilicate glass.

[0061] In a second aspect, the present application provides a method for preparing glass, including the following steps: during the process of preparing glass, glasses with different thicknesses are prepared by controlling the degree of crystallization P of the glass; the degree of crystallization P is 0 to 8×10 -3 w 2 g -2 ℃ -1 , and the degree of crystallization P is obtained by testing through the testing method for the degree of crystallization of glass as described above; the thickness t of the glass is 0.1 to 8 mm.

[0062] In some embodiments, calculated in terms of molar percentage of oxides, the glass includes the following components:

[0063] SiO2 is 50.00 - 80.00 mol%,

[0064] Al2O3 is 8.00 - 20.00 mol%,

[0065] Na2O is 2.00 - 10.00 mol%,

[0066] Li2O is 1 to 15.00 mol%,

[0067] K2O is 0 to 5.00 mol%,

[0068] MgO is 0 to 10.00 mol%,

[0069] ZrO2 is 0 to 5.00 mol%,

[0070] CaO is 0 to 5.00 mol%,

[0071] La2O3 is 0 to 3.00 mol%,

[0072] Y2O3 is 0 to 3.00 mol%.

[0073] In the present application, SiO2 is the main component constituting the glass and is a network former, and its structure is a silicon-oxygen tetrahedron [SiO4]. It can endow the glass with a series of excellent properties, such as transparency, mechanical strength, ultraviolet light transmittance, chemical stability, and thermal stability. In some embodiments, calculated in terms of the molar percentage of oxides, the content of SiO2 is 50.00 mol% or more, preferably 60.00 mol% or more, and more preferably 63.00 mol% or more. In some embodiments, calculated in terms of the molar percentage of oxides, the content of SiO2 is 80.00 mol% or less, preferably 75.00 mol% or less. In some embodiments, calculated in terms of the molar percentage of oxides, the content of SiO2 can be 50.00 mol%, 52.00 mol%, 55.00 mol%, 57.00 mol%, 59.00 mol%, 60.00 mol%, 61.00 mol%, 62.30 mol%, 63.50 mol%, 64.40 mol%, 64.60 mol%, 65.00 mol%, 65.20 mol%, 65.40 mol%, 65.60 mol%, 65.80 mol%, 66.00 mol%, 66.50 mol%, 66.60 mol%, 66.70 mol%, 69.00 mol%, 69.15 mol%, 69.25 mol%, 69.50 mol%, 69.72 mol%, 69.92 mol%, 69.98 mol%, 70.29 mol%, 71.00 mol%, 73.00 mol%, 75.00 mol%, 77.00 mol%, 79.00 mol%, or 80.00 mol%, etc., and all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0074] Al2O3 is a component for improving the ion exchangeability during chemical strengthening, increasing the surface compressive stress after strengthening, and enhancing the mechanical properties of the glass. In some embodiments, the content of Al2O3 is 8.00 mol% to 20.00 mol% calculated in terms of the molar percentage of oxides. In some embodiments, calculated in terms of the molar percentage of oxides, the content of Al2O3 can be 8.00 mol%, 8.90 mol%, 9.50 mol%, 9.60 mol%, 9.80 mol%, 10.00 mol%, 10.50 mol%, 10.60 mol%, 10.80 mol%, 10.90 mol%, 11.00 mol%, 11.40 mol%, 12.21 mol%, 13.26 mol%, 14.27 mol%, 15.50 mol%, 16.75 mol%, 17.86 mol%, 18.90 mol%, 19.00 mol% or 20.00 mol%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0075] Na2O exists in the glass in the form of an extra-network former and is a component for ion exchange and reducing the tendency of glass crystallization. In some embodiments, the content of Na2O is 2.00 mol% to 10.00 mol% calculated in terms of the molar percentage of oxides. In some embodiments, calculated in terms of the molar percentage of oxides, the content of Na2O can be 2.00 mol%, 3.10 mol%, 4.90 mol%, 5.00 mol%, 6.00 mol%, 6.50 mol%, 7.00 mol%, 7.40 mol%, 7.50 mol%, 7.60 mol%, 7.90 mol%, 8.00 mol%, 9.00 mol% or 10.00 mol%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0076] MgO can improve the chemical stability and mechanical strength of glass and can reduce the crystallization tendency of glass. In some embodiments, calculated in terms of the molar percentage of oxides, the content of MgO is 0 to 10.00 mol%. In some embodiments, calculated in terms of the molar percentage of oxides, the content of MgO can be 0 mol%, 2.00 mol%, 3.00 mol%, 4.00 mol%, 4.40 mol%, 4.60 mol%, 4.90 mol%, 5.00 mol%, 5.40 mol%, 5.50 mol%, 6.00 mol%, 6.40 mol%, 6.90 mol%, 7.00 mol%, 7.50 mol%, 8.00 mol%, 8.70 mol%, 9.00 mol%, 9.50 mol% or 10.00 mol%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0077] CaO can increase the chemical stability and mechanical strength of glass, can reduce the viscosity of glass, and improve the meltability and formability of glass. In some embodiments, calculated in terms of the molar percentage of oxides, the content of CaO is 0 to 5.00 mol%. In some embodiments, calculated in terms of the molar percentage of oxides, the content of CaO can be 0 mol%, 0.10 mol%, 0.20 mol%, 0.50 mol%, 0.75 mol%, 1.00 mol%, 1.50 mol%, 1.79 mol%, 2.85 mol%, 3.86 mol%, 4.89 mol% or 5.00 mol%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0078] Li2O exists in the glass as an extra-network component, which is the main component of ion exchange, increases the deep compressive stress, and increases the Young's modulus. In some embodiments, calculated in terms of the molar percentage of the oxide, the content of Li2O is 1 to 15.00 mol%. In some embodiments, calculated in terms of the molar percentage of the oxide, the content of Li2O can be 1.00 mol%, 3.00 mol%, 6.60 mol%, 7.00 mol%, 7.20 mol%, 7.60 mol%, 7.70 mol%, 7.80 mol%, 9.20 mol%, 9.30 mol%, 9.80 mol%, 10.00 mol%, 10.20 mol%, 10.30 mol%, 10.70 mol%, 10.50 mol%, 10.60 mol%, 11.20 mol%, 12.00 mol%, 13.50 mol%, 14.80 mol% or 15.00 mol%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0079] Similar to Na2O, K2O is also an extra-network oxide, which can greatly reduce the viscosity of the glass melt, but its effect is slightly weaker, and it is also a flux for manufacturing glass. In some embodiments, calculated in terms of the molar percentage of the oxide, the content of K2O is 0 mol% to 5.00 mol%. In some embodiments, calculated in terms of the molar percentage of the oxide, the content of K2O can be 0 mol%, 1.00 mol%, 1.90 mol%, 2.29 mol%, 2.42 mol%, 3.15 mol%, 3.30 mol%, 4.40 mol%, 4.60 mol%, 4.80 mol% or 5.00 mol%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0080] ZrO2 can increase the viscosity and chemical stability of the glass and reduce the thermal expansion coefficient of the glass. In some embodiments, calculated in terms of the molar percentage of the oxide, the content of ZrO2 is 0 to 5.00 mol%. In some embodiments, calculated in terms of the molar percentage of the oxide, the content of ZrO2 can be 0 mol%, 0.60 mol%, 1.00 mol%, 1.50 mol%, 1.62 mol%, 1.68 mol%, 1.70 mol%, 1.72 mol%, 1.74 mol%, 1.85 mol%, 2.50 mol%, 2.54 mol%, 2.58 mol%, 2.59 mol%, 2.62 mol%, 2.66 mol%, 2.67 mol%, 3.10 mol%, 3.25 mol%, 3.46 mol%, 3.67 mol%, 4.77 mol% or 5.00 mol%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0081] Y2O3 is a component that enhances the Young's modulus of the glass and improves the meltability of the glass. In some embodiments, calculated in terms of the molar percentage of the oxide, the content of Y2O3 is 0 to 3.00 mol%. In some embodiments, calculated in terms of the molar percentage of the oxide, the content of Y2O3 can be 0 mol%, 0.30 mol%, 0.60 mol%, 0.80 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.50 mol%, 2.00 mol%, 2.50 mol% or 3.00 mol%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0082] La2O3 is a component that enhances the Young's modulus of the glass and increases the refractive index of the glass. In some embodiments, calculated in terms of the molar percentage of the oxide, the content of La2O3 is 0 to 3.00 mol%. In some embodiments, calculated in terms of the molar percentage of the oxide, the content of La2O3 can be 0 mol%, 0.50 mol%, 0.80 mol%, 1.00 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 2.00 mol%, 2.50 mol% or 3.00 mol%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0083] In some embodiments, the upper crystallization temperature of the glass is 1000 - 1200 °C. In some embodiments of the present application, the value of the upper crystallization temperature can be 1000 °C, 1020 °C, 1050 °C, 1080 °C, 1090 °C, 1100 °C, 1110 °C, 1120 °C, 1140 °C, 1150 °C, 1160 °C, 1170 °C, 1180 °C, 1190 °C or 1200 °C, etc., as well as all ranges and sub - ranges between the above - mentioned values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0084] In some embodiments, the viscosity of the glass at the forming stage is 10 3.6 dPa·s - 10 6.80 dPa·s, preferably 10 3.93 dPa·s - 10 6.80 dPa·s, more preferably 10 3.93 dPa·s - 10 6.60 dPa·s. In some embodiments, the viscosity of the glass at the forming stage can be 10 3.6 dPa·s, 10 3.7 dPa·s, 10 3.8 dPa·s, 10 3.9 dPa·s, 10 4.0 dPa·s, 10 4.2 dPa·s, 10 4.34 dPa·s, 10 4.52 dPa·s, 10 4.7 dPa·s, 10 4.9 dPa·s, 10 5.0 dPa·s, 10 5.3 dPa·s, 10 5.5 dPa·s, 10 5.8 dPa·s, 10 6.0 dPa·s, 10 6.1 dPa·s, 10 6.3 dPa·s, 10 6.5 dPa·s, 10 6.6 dPa·s, 10 6.7 dPa·s or 10 6.8 dPa·s, etc., as well as all ranges and sub - ranges between the above - mentioned values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0085] In some embodiments, the viscosity of the glass at the forming stage is 10 3.6 dPa·s - 10 6.80The residence time at 10 dPa·s is 20 min - 45 min, preferably 20 min - 43 min. In some embodiments, the viscosity of the glass at the forming stage is 10 3.6 dPa·s - 10 6.80 The residence time at dPa·s can be 20 min, 25 min, 30 min, 35 min, 38 min, 39 min, 40 min, 41 min, 42 min, 43 min, 44 min or 45 min, etc., and all ranges and sub - ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0086] In some embodiments, the temperature of the glass at 10 4.0 dPa·s is below 1300 °C, below 1250 °C, below 1200 °C, below 1150 °C, below 1100 °C, below 1090 °C or below 1080 °C, and all ranges and sub - ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0087] In some embodiments, the temperature of the glass at 10 4.34 dPa·s is below 1150 °C, below 1100 °C, below 1090 °C, below 1080 °C, below 1070 °C or below 1060 °C, and all ranges and sub - ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0088] In some embodiments, the temperature of the glass at 10 4.52 dPa·s is below 1080 °C, below 1060 °C, below 1050 °C, below 1020 °C, below 1000 °C, below 980 °C, below 970 °C or below 960 °C, and all ranges and sub - ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0089] In some embodiments, the thickness t of the glass is 0.1 to 8 mm. In some embodiments, the thickness t of the glass can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, or 8.0 mm, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range.

[0090] In some embodiments, when the degree of crystallization P of the glass during preparation ≤ 7.22×10 -3 w 2 g -2 °C -1 , glass with a thickness ≤ 1 mm can be produced. In some embodiments, the degree of crystallization P of the glass during preparation can be 0 w 2 g -2 °C -1 , 3.38×10 -6 w 2 g -2 °C -1 , 1.15×10 -5 w 2 g -2 °C -1 , 3.66×10 -5 w 2 g -2 °C -1 , 5.08×10 -5 w 2 g -2 °C -1 , 6.43×10 -5 w 2 g -2 °C -1 , 6.60×10 -5 w 2 g -2 °C -1 , 6.78×10 -5 w 2 g -2 °C -1 , 7.16×10 -5 w 2 g -2 °C -1 , 7.91×10 -5 w 2 g-2 °C -1 、8.46×10 -5 w 2 g -2 °C -1 、9.75×10 -5 w 2 g -2 °C -1 、1.15×10 -4 w 2 g -2 °C -1 、1.31×10 -4 w 2 g -2 °C -1 、1.67×10 -4 w 2 g -2 °C -1 、2.01×10 -4 w 2 g -2 °C -1 、3.11×10 -4 w 2 g -2 °C -1 、5.62×10 -4 w 2 g -2 °C -1 、6.19×10 -4 w 2 g -2 °C -1 、6.22×10 -4 w 2 g -2 °C -1 、6.51×10 -4 w 2 g -2 °C -1 、6.77×10 -4 w 2 g -2 °C -1 、7.21×10 -4 w 2 g -2 °C -1 、7.50×10 -4 w 2 g -2 °C -1 、7.53×10 -4 w 2 g -2 °C -1 、8.05×10 -4 w2 g -2 °C -1 、8.10×10 -4 w 2 g -2 °C -1 、8.20×10 -4 w 2 g -2 °C -1 、8.30×10 -4 w 2 g -2 °C -1 、8.50×10 -4 w 2 g -2 °C -1 、8.75×10 -4 w 2 g -2 °C -1 、8.90×10 -4 w 2 g -2 °C -1 、9.20×10 -4 w 2 g -2 °C -1 、9.50×10 -4 w 2 g -2 °C -1 、9.80×10 -4 w 2 g -2 °C -1 、9.90×10 -4 w 2 g -2 °C -1 、1.00×10 -3 w 2 g -2 °C -1 、1.50×10 -3 w 2 g -2 °C -1 、2.00×10 -3 w 2 g -2 °C -1 、2.50×10 -3 w 2 g -2 °C -1 、3.00×10 -3 w 2 g -2 °C -1 、3.50×10-3 w 2 g -2 °C -1 、4.00×10 -3 w 2 g -2 °C -1 、4.50×10 -3 w 2 g -2 °C -1 、5.00×10 -3 w 2 g -2 °C -1 、5.50×10 -3 w 2 g -2 °C -1 、6.00×10 -3 w 2 g -2 °C -1 、6.50×10 -3 w 2 g -2 °C -1 、6.80×10 -3 w 2 g -2 °C -1 、7.00×10 -3 w 2 g -2 °C -1 、7.10×10 -3 w 2 g -2 °C -1 、7.15×10 -3 w 2 g -2 °C -1 、7.20×10 -3 w 2 g -2 °C -1 or 7.22×10 -3 w 2 g -2 °C -1 etc., and all ranges and sub - ranges between any of the above values. It should be understood that, in an embodiment, any of the above ranges can be combined with any other range; glass with a thickness ≤ 1 mm can be produced.

[0091] In some embodiments, when the degree of crystallization P of the glass during preparation ≤ 1.12×10 -3 w 2 g -2 °C -1When it is, glass with a thickness ≤ 3 mm can be produced. In some embodiments, the degree of crystallization P of the glass during preparation can be 0 w 2 g -2 ℃ -1 、3.38×10 -6 w 2 g -2 ℃ -1 、1.15×10 -5 w 2 g -2 ℃ -1 、3.66×10 -5 w 2 g -2 ℃ -1 、5.08×10 -5 w 2 g -2 ℃ -1 、6.43×10 -5 w 2 g -2 ℃ -1 、6.60×10 -5 w 2 g -2 ℃ -1 、6.78×10 -5 w 2 g -2 ℃ -1 、7.16×10 -5 w 2 g -2 ℃ -1 、7.91×10 -5 w 2 g -2 ℃ -1 、8.46×10 -5 w 2 g -2 ℃ -1 、9.75×10 -5 w 2 g -2 ℃ -1 、1.15×10 -4 w 2 g -2 ℃ -1 、1.31×10 -4 w 2 g -2 ℃ -1 、1.67×10 -4 w 2 g -2 ℃ -1 、2.01×10 -4 w 2g -2 °C -1 、3.11×10 -4 w 2 g -2 °C -1 、5.62×10 -4 w 2 g -2 °C -1 、6.19×10 -4 w 2 g -2 °C -1 、6.22×10 -4 w 2 g -2 °C -1 、6.51×10 -4 w 2 g -2 °C -1 、6.77×10 -4 w 2 g -2 °C -1 、7.21×10 -4 w 2 g -2 °C -1 、7.50×10 -4 w 2 g -2 °C -1 、7.53×10 -4 w 2 g -2 °C -1 、8.05×10 -4 w 2 g -2 °C -1 、8.10×10 -4 w 2 g -2 °C -1 、8.20×10 -4 w 2 g -2 °C -1 、8.30×10 -4 w 2 g -2 °C -1 、8.50×10 -4 w 2 g -2 °C -1 、8.75×10 -4 w 2 g -2 °C -1 、8.90×10 -4 w2 g -2 °C -1 、9.20×10 -4 w 2 g -2 °C -1 、9.50×10 -4 w 2 g -2 °C -1 、9.80×10 -4 w 2 g -2 °C -1 、9.90×10 -4 w 2 g -2 °C -1 、1.00×10 -3 w 2 g -2 °C -1 、1.05×10 -3 w 2 g -2 °C -1 、1.08×10 -3 w 2 g -2 °C -1 、1.10×10 -3 w 2 g -2 °C -1 or 1.12×10 -3 w 2 g -2 °C -1 etc., and all ranges and sub - ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range; glass with a thickness ≤ 3 mm can be produced.

[0092] In some embodiments, when the degree of crystallization P of the glass during preparation ≤ 1.0×10 -3 w 2 g -2 °C -1 , glass with a thickness ≤ 8 mm can be produced. When the thickness of the glass ≤ 8 mm, the degree of crystallization P of the glass during preparation can be 0 w 2 g -2 °C -1 、3.38×10 -6 w 2 g -2 °C -1 、1.15×10 -5 w 2 g -2 °C -1, 3.66×10 -5 w 2 g -2 °C -1 , 5.08×10 -5 w 2 g -2 °C -1 , 6.43×10 -5 w 2 g -2 °C -1 , 6.60×10 -5 w 2 g -2 °C -1 , 6.78×10 -5 w 2 g -2 °C -1 , 7.16×10 -5 w 2 g -2 °C -1 , 7.91×10 -5 w 2 g -2 °C -1 , 8.46×10 -5 w 2 g -2 °C -1 , 9.75×10 -5 w 2 g -2 °C -1 , 1.15×10 -4 w 2 g -2 °C -1 , 1.31×10 -4 w 2 g -2 °C -1 , 1.67×10 -4 w 2 g -2 °C -1 , 2.01×10 -4 w 2 g -2 °C -1 , 3.11×10 -4 w 2 g -2 °C -1 , 5.62×10 -4 w 2 g -2 °C -1 , 6.19×10 -4 w 2 g -2 °C-1 , 6.22×10 -4 w 2 g -2 °C -1 , 6.51×10 -4 w 2 g -2 °C -1 , 6.77×10 -4 w 2 g -2 °C -1 , 7.21×10 -4 w 2 g -2 °C -1 , 7.50×10 -4 w 2 g -2 °C -1 , 7.53×10 -4 w 2 g -2 °C -1 , 8.05×10 -4 w 2 g -2 °C -1 , 8.10×10 -4 w 2 g -2 °C -1 , 8.20×10 -4 w 2 g -2 °C -1 , 8.30×10 -4 w 2 g -2 °C -1 , 8.50×10 -4 w 2 g -2 °C -1 , 8.75×10 -4 w 2 g -2 °C -1 , 8.90×10 -4 w 2 g -2 °C -1 , 9.20×10 -4 w 2 g -2 °C -1 , 9.50×10 -4 w 2 g -2 °C -1 , 9.80×10 -4 w 2 g-2 °C -1 、9.90×10 -4 w 2 g -2 °C -1 or 1.00×10 -3 w 2 g -2 °C -1 etc., as well as all ranges and sub-ranges between the above values. It should be understood that in the embodiments, any of the above ranges can be combined with any other range; glass with a thickness ≤ 8 mm can be produced.

[0093] In some embodiments, the process for preparing the glass includes float production.

[0094] In some embodiments, the glass can be chemically strengthened to obtain strengthened glass, and the strengthening method can be a general chemical strengthening method in the art.

[0095] In a third aspect, the present application provides an application of the glass prepared by the preparation method as described above in a mobile phone back cover, an electronic terminal, a decorative item, a handicraft, a jewelry, or a portable digital device.

[0096] In a fourth aspect, a consumer electronic product includes: a housing including a front surface, a back surface, and side surfaces; electronic components at least partially located within the housing, the electronic components including at least a controller, a memory, and a display, the display being located at the front surface of the housing or adjacent to the front surface of the housing; and a cover glass disposed on the display, wherein at least a part of the housing includes the glass prepared by the glass preparation method as described above or the strengthened glass obtained by strengthening it.

[0097] In a fifth aspect, an electronic device contains the glass prepared by the preparation method as described above or the strengthened glass obtained by strengthening it.

[0098] In a sixth aspect, for the test method, the relevant measurement methods involved in the present application are explained as follows.

[0099] 1. Thermal analysis (DSC) test:

[0100] The instrument used is a Mettler Toledo TGA / DSC 3+ thermogravimetric and synchronous thermal analyzer. The test is carried out in accordance with JY / T 0589.5-202. The standard substance used for the test is α-Al2O3 powder. The container for placing the sample is a platinum crucible. The ambient temperature of the instrument is 24 °C and the air humidity is 40%. After grinding the glass and screening it through a 200-mesh sieve, the sample to be tested is obtained. About 20 mg of the sample is weighed and heated from room temperature to 900 °C at a heating rate of 10 °C / min under a nitrogen protection atmosphere to obtain the DSC curve of the sample.

[0101] 2. Glass devitrification test method:

[0102] (1) Break the glass into small pieces with a size of 2 mm - 5 mm, and then put them into a long platinum-yellow boat and spread them out.

[0103] (2) Set the temperature range of the gradient furnace of model GTF-1612SLW-G, and set the upper limit temperature point of the glass batch's devitrification as the highest temperature point of the platinum-yellow boat temperature range in the gradient furnace. For example, if the upper limit of devitrification is 1130 °C, then set the highest test temperature to 1130 °C.

[0104] (3) After the gradient furnace reaches the preset temperature range, put the platinum-yellow boat containing the sample to be tested into the gradient furnace. After maintaining the temperature for 10, 20, and 30 minutes, take out the platinum-yellow boat.

[0105] (4) Observe the glass sample using a polarized light microscope or an optical microscope.

[0106] In the seventh aspect, the present application will be described below through specific examples.

[0107] Example 1

[0108] According to the glass compositions described in Tables 1 - 5, heat and melt each raw material component of the glass in a glass melting furnace and mix them. Then, homogenize the molten glass by bubbling, stirring, adding fining agents, etc., and form it into a glass plate with a specified thickness in a tin bath using the float forming method.

[0109] The degree of devitrification during the forming process of the glass plate and the thickness of the glass that can be produced are shown in Tables 1 - 5; ○ in the table indicates that the glass of this thickness can be produced, × in the table indicates that the glass of this thickness cannot be produced, and -- in the table indicates that this component is not added.

[0110] Table 1

[0111] Example 1 Example 2 Example 3 Example 4 Example 5 <![CDATA[SiO2 (mol)]]> 66.0 65.0 66.0 65.6 65.6 <![CDATA[Al2O3(mol)]]> 11.0 10.8 11.4 10.9 8.9 <![CDATA[ZrO2 (mol)]]> 1.5 1.5 0.6 1.5 1.0 MgO(mol) 5.5 5.4 4.6 5.5 4.9 <![CDATA[Na2O (mol)]]> 8.0 7.9 8.0 8.0 6.0 <![CDATA[K2O (mol)]]> -- -- -- -- -- <![CDATA[Li2O (mol)]]> 7.2 7.6 6.6 7.7 11.2 CaO(mol) -- 1.0 1.0 -- -- SrO(mol) -- -- 1.0 -- -- <![CDATA[Y2O3(mol)]]> 0.8 0.3 0.3 0.3 1.1 <![CDATA[La2O3 (mol)]]> -- 0.5 0.5 0.5 1.3 total 100.0 100.0 100.0 100.0 100.0 Crystallization upper limit temperature (℃) 1073 1059 1064 1066 1093 <![CDATA[(dQ / dT) avg > 0.0015 0.0015 0.0010 0.0016 0.0018 Q 0.1024 0.2553 0.4896 0.199 -0.4737 <![CDATA[Q max > 0.1788 0.3005 0.5687 0.2392 -0.4008 丨h丨 0.0764 0.0452 0.0791 0.0402 0.0729 <![CDATA[P(w 2 g -2 ℃ -1 )]]> <![CDATA[1.15×10 -4 > <![CDATA[6.78×10 -5 > <![CDATA[7.91×10 -5 > <![CDATA[6.43×10 -5 > <![CDATA[1.31×10 -4 > Glass with a thickness of less than 1mm ○ ○ ○ ○ ○ Glass with a thickness of less than 3mm ○ ○ ○ ○ ○ Glass with a thickness of less than 8mm ○ ○ ○ ○ ○

[0112] Table 2

[0113]

[0114]

[0115] Table 3

[0116] Embodiment 11 Example 12 Embodiment 13 Embodiment 14 Embodiment 15 <![CDATA[SiO2(mol)]]> 63.5 62.3 65.0 65.0 65.0 <![CDATA[Al2O3 (mol)]]> 9.8 9.6 10.0 10.0 10.0 <![CDATA[ZrO2 (mol)]]> -- -- -- -- -- MgO(mol) 6.9 6.7 5.5 4.0 2.0 <![CDATA[Na2O (mol)]]> 7.0 9.0 6.5 8.0 10.0 <![CDATA[K2O (mol)]]> -- -- -- -- -- <![CDATA[Li2O (mol)]]> 10.0 9.8 10.2 10.2 10.2 CaO(mol) -- -- -- -- -- SrO(mol) -- -- -- -- -- <![CDATA[Y2O3 (mol)]]> 1.3 1.2 1.3 1.3 1.3 <![CDATA[La2O3(mol)]]> 1.5 1.4 1.5 1.5 1.5 total 100.0 100.0 100.0 100.0 100.0 Crystallization upper limit temperature (℃) 1114 1128 1131 1127 1117 <![CDATA[(dQ / dT) avg > 0.0018 0.0005 0.0025 0.0011 0.0002 Q -0.2169 -0.3301 -0.1286 -0.1823 -0.2395 <![CDATA[Q max > -0.1053 -0.3072 -0.0042 -0.1223 -0.2226 丨h丨 0.1116 0.0229 0.1244 0.0600 0.0169 <![CDATA[P(w 2 g -2 ℃ -1 )]]> <![CDATA[2.01×10 -4 > <![CDATA[1.15×10 -5 > <![CDATA[3.11×10 -4 > <![CDATA[6.60×10 -5 > <![CDATA[3.38×10 -6 > Glass with a thickness of less than 1mm ○ ○ ○ ○ ○ Glass with a thickness of less than 3mm ○ ○ ○ ○ ○ Glass with a thickness of less than 8mm ○ ○ ○ ○ ○

[0117] Table 4

[0118]

[0119]

[0120] Table 5

[0121] Embodiment 21 Embodiment 22 Embodiment 23 Embodiment 24 Embodiment 25 <![CDATA[SiO2 (mol)]]> 66.5 64.4 64.6 64.6 65.2 <![CDATA[Al2O3(mol)]]> 10.0 9.9 9.9 10.0 10.1 <![CDATA[ZrO2 (mol)]]> 1.5 -- -- -- -- MgO(mol) 5.5 6.9 6.4 6.0 6.0 <![CDATA[Na2O (mol)]]> 7.5 5.0 4.9 6.0 6.0 <![CDATA[K2O (mol)]]> -- -- -- -- -- <![CDATA[Li2O (mol)]]> 7.7 10.6 10.5 10.2 10.3 CaO(mol) 0.5 1.0 1.5 1.0 1.0 SrO(mol) -- -- -- -- -- <![CDATA[Y2O3(mol)]]> 0.3 1.0 1.0 1.0 0.6 <![CDATA[La2O3 (mol)]]> 0.5 1.2 1.2 1.2 0.8 total 100.0 100.0 100.0 100.0 100.0 Crystallization upper limit temperature (℃) 1035 1117 1128 1126 1124 <![CDATA[(dQ / dT) avg > 0.0009 0.0062 0.0042 0.0043 0.0039 Q -0.4440 -0.0223 -0.1470 0.0465 -0.1340 <![CDATA[Q max > -0.3500 0.0684 0.0316 0.2141 0.0329 丨h丨 0.0940 0.0907 0.1786 0.1676 0.1669 <![CDATA[P(w 2 g -2 ℃ -1 )]]> <![CDATA[8.46×10 -5 > <![CDATA[5.62×10 -4 > <![CDATA[7.50×10 -4 > <![CDATA[7.21×10 -4 > <![CDATA[6.51×10 -4 > Glass with a thickness of less than 1mm ○ ○ ○ ○ ○ Glass with a thickness of less than 3mm ○ ○ ○ ○ ○ Glass with a thickness of less than 8mm ○ ○ ○ ○ ○

[0122] Table 6

[0123] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 <![CDATA[SiO2(mol)]]> 65.2 65 69.8 69.0 <![CDATA[Al2O3 (mol)]]> 10.1 10 10.0 10.0 <![CDATA[ZrO2 (mol)]]> -- -- -- -- MgO(mol) 6.0 7.0 6.0 6.0 <![CDATA[Na2O (mol)]]> 6.0 5.0 3.5 3.5 <![CDATA[K2O (mol)]]> -- -- 2.0 2.0 <![CDATA[Li2O (mol)]]> 10.3 10.2 8.7 8.7 CaO(mol) -- -- -- -- SrO(mol) -- -- -- -- <![CDATA[Y2O3 (mol)]]> 1.1 1.3 -- 0.3 <![CDATA[La2O3(mol)]]> 1.3 1.5 -- 0.5 total 100.0 100.0 100.0 100.0 Crystallization upper limit temperature (℃) 1081 1120 1108 1150 <![CDATA[(dQ / dT) avg > 0.0054 0.0179 0.0060 0.0197 Q 0.0582 -0.5656 -0.0224 -0.6222 <![CDATA[Q max > 0.2665 -0.1625 0.2040 -0.2151 丨h丨 0.2083 0.4031 0.2264 0.4071 <![CDATA[P(w 2 g -2 ℃ -1 )]]> <![CDATA[1.12×10 -3 > <![CDATA[7.22×10 -3 > <![CDATA[1.36×10 -3 > <![CDATA[8.02×10 -3 > Glass with a thickness of less than 1mm ○ ○ ○ × Glass with a thickness of less than 3mm ○ × × × Glass with a thickness of less than 8mm × × × ×

[0124] The following table shows the polarized light microscope observation diagrams of the crystallization situations and the measured crystal diameters of Examples 1-2 and Comparative Examples 1, 3-4 during the crystallization experiment.

[0125] Table 7

[0126]

[0127]

[0128] Table 8

[0129] Example 1 Example 2 Comparative Example 1 Comparative Example 3 Comparative Example 4 Crystallization upper limit temperature (℃) 1073 1059 1081 1108 1150 thickness 1mm 1mm 1mm 1mm 1mm <![CDATA[10 4.34 dPa·s(℃)]]> 1085 1062 987 1110 974 <![CDATA[10 3.93 to 10 4.34 dPa·s residence time (min)]]> 18.9 18.9 18.9 18.9 18.9 <![CDATA[10 4.58 dPa·s(℃)]]> 1057 1036 954 1070 939 <![CDATA[10 4.34 to 10 4.58 dPa·s residence time (min)]]> 2.5 2.5 2.5 2.5 2.5 <![CDATA[10 5.37 dPa·s(℃)]]> 947 928 852 956 830 <![CDATA[10 4.58 to 10 5.37 dPa·s residence time (min)]]> 0.8 0.8 0.8 0.8 0.8

[0130] Table 9

[0131] Example 1 Example 2 Comparative Example 1 Comparative Example 3 Comparative Example 4 thickness 3mm 3mm 3mm 3mm 3mm <![CDATA[10 4.4 dPa·s(℃)]]> 1084 1061 979 1109 965 <![CDATA[10 3.96 to 10 4.4 dPa·s residence time (min)]]> 24.3 24.3 24.3 24.3 24.3 <![CDATA[10 5.24 dPa·s(℃)]]> 964 945 868 973 847 <![CDATA[10 4.4 to 10 5.24 dPa·s residence time (min)]]> 7.9 7.9 7.9 7.9 7.9 <![CDATA[10 6.11 dPa·s(℃)]]> 853 837 766 859 737 <![CDATA[10 5.24 to 10 6.11 dPa·s residence time (min)]]> 2.8 2.8 2.8 2.8 2.8

[0132] Table 10

[0133]

[0134]

[0135] Combined with Tables 1-10 and the attached drawings, it can be seen that:

[0136] (1) As can be seen from Table 8, when the glass melts of Examples 1-2 and Comparative Example 3 are used to produce 1-mm-thick glass by the float process, the viscosities during the forming stage are between 10 3.93 and 10 4.34 dPa·s, and the temperatures corresponding to their viscosities are higher than the upper crystallization temperature of their respective glasses. Therefore, they will not crystallize. When the viscosities are between 10 4.34 dPa·s - 10 5.37 dPa·s, since the temperatures corresponding to their viscosities are lower than the upper crystallization temperature of their respective glasses, there is a risk of crystallization; however, the crystallization degrees P of Examples 1-2 and Comparative Examples 2 and 3 are all relatively low, less than 7.22×10 -3 w 2 g -2 ℃ -1Moreover, the residence time is only 3.4 min, which is very short. Even if crystallization occurs, large grains will not precipitate to affect the float glass production. Therefore, even for Comparative Example 3, float glass with a thickness of 1 mm can still be produced. However, in Comparative Example 4, the residence time below the crystallization upper limit temperature is longer, and the crystallization degree P value is relatively high, which is 8.02×10 -3 w 2 g -2 ℃ -1 , which is sufficient to precipitate large grains and thus affect the float glass production. Therefore, float glass with a thickness of 1 mm cannot be produced.

[0137] (2) As can be seen from Table 9, when the glass melts of Examples 1-2 and Comparative Examples 1, 3-4 are used to produce 3-mm-thick glass by the float process, since the viscosities of Examples 1-2 and Comparative Example 1 during float forming are in the range of 10 3.96 to 10 4.4 dPa·s, even if the residence time in the corresponding temperature range is relatively long, which is 24.3 min, since the crystallization degrees P are all relatively low, less than 1.12×10 -3 w 2 g -2 ℃ -1 , large grains will not precipitate, as shown in Figure 2 、 3 、4. When the viscosities during float forming are in the range of 10 4.4 to 10 5.24 dPa·s, the residence time is only 7.9 min, and large grains will not precipitate to affect the float glass production. Therefore, Examples 1-2 and Comparative Example 1 can produce 3-mm-thick glass by the float process. However, for Comparative Examples 3-4, since their crystallization degrees P are relatively high, crystallization is relatively serious when they stay for 10 min in the corresponding forming viscosity range. Therefore, 3-mm-thick glass cannot be produced by the float process.

[0138] (3) As can be seen from Table 10, when the glass melts of Examples 1-2 and Comparative Examples 3-4 are used to produce 8-mm-thick glass by the float process, when the temperatures corresponding to the viscosities during the forming stage are all below their respective crystallization upper limit temperatures, there will be a risk of crystallization; the crystallization degrees P of Examples 1-2 are all less than 1×10 -3 w 2 g -2 ℃ -1 , as can also be seen from Figure 2 、 3 , large grains will not precipitate in the corresponding temperature range during the forming stage to affect the float glass production. Therefore, 8-mm-thick glass can be produced by the float process. Since the crystallization degrees P of Comparative Examples 3-4 are relatively high, greater than 1×10 -3 w 2 g -2 ℃-1 As mentioned above, its residence time in the forming stage is very long, being 35 minutes and 40.8 minutes. Therefore, large grains will precipitate, which affects the float glass production and further prevents the production of 8-mm-thick glass. Additionally, from Figure 5 and Figure 6 The optical microscope images of the crystallization conditions also prove that for the glass melt in Comparative Examples 3-4, when the temperature is below 1030°C and the crystallization time is more than 10 minutes, the crystal grains are large and numerous; this is sufficient to affect the glass production.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than limiting them. Those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solutions of the present application without departing from the purpose and scope of the technical solutions should be covered within the scope of the claims of the present application.

Claims

1. A method for testing the crystallization degree of glass, characterized in that: The steps include: Step 1: Use a synchronous thermal analyzer to obtain the heat flow Q-temperature T curve of the glass, and determine T according to the crystallization peak area of ​​the glass in the figure. pbmin 、T Q , Q s and Q max ; Among them, T pbmin It is the lowest temperature at which the glass starts to crystallize in the crystallization peak region; T Q is the temperature corresponding to when Q reaches its maximum value; Q s Q is the Q value when the glass starts to crystallize; max is the maximum value of Q value; Calculate h = Q max -Q s ; Step 2: Calculate the degree of crystallization: P = |h| × (dQ / dT) avg In the formula, the crystallization peak area is from T pbmin to T Q Differentiate to obtain n dQ / dT, where n is not less than 100; (dQ / dT) avg is the average value of n dQ / dT.

2. The testing method according to claim 1, characterized in that: The test temperature in the test method ranges from 30 to 900°C.

3. The testing method according to claim 1, characterized in that: The heating rate in the test method is 1-15°C / min.

4. The testing method according to claim 1, characterized in that: The test method is used to test the degree of crystallization during the glass preparation process.

5. The testing method according to any one of claims 1 to 4, characterized in that: The glass includes lithium aluminosilicate glass.

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