Glass article and method of making, 3D heat bent glass and method of making, Electronic product

Abstract

This invention discloses a glass product and its preparation method, 3D hot-bent glass and its preparation method, and electronic products, belonging to the field of glass manufacturing technology. The glass product of this invention contains SiO2, Al2O3, Y2O3, ZrO2, La2O3, R2O, and RO, satisfying A=(R2O+RO) / (Al2O3+Y2O3+ZrO2), A≥0.37. By adjusting the components and their proportions, this invention achieves a lower softening point and a lower coefficient of thermal expansion, thus solving the problems of large dimensional fluctuations and poor appearance of 3D hot-bent glass caused by high coefficients of thermal expansion and high softening points.

Description

Technical Field

[0001] This invention relates to the field of glass manufacturing technology, and in particular to a glass product and its preparation method, 3D hot-bent glass and its preparation method, and electronic products. Background Technology

[0002] In recent years, electronic information products have generally featured touch panel displays, such as tablets, smartphones, and in-vehicle screens. The outermost layer of a touch panel display is a protective glass layer, also known as "Cover Glass."

[0003] With the development of cover glass, the requirements for cover glass are no longer limited to good mechanical strength (bending resistance, impact resistance, and drop resistance), but also require cover glass to have various irregular shapes. Currently, processing plants mainly use 3D hot bending technology to process glass into various shapes. The bottlenecks limiting 3D hot bending of glass are mainly twofold: firstly, excessively high hot bending temperatures can lead to surface defects such as pitting and shorten the lifespan of graphite molds; secondly, the coefficient of thermal expansion of current lithium aluminum silicon glass is generally quite high, around 8×10⁻⁶. -6 / ℃~9×10 -6 / ℃, while commonly used glass fixtures are smaller; for example, the coefficient of thermal expansion of graphite fixtures is distributed in -5×10. -6 / ℃~2.0×10 -6 Between ℃, the coefficients of thermal expansion of the glass and the glass fixture differ significantly. At room temperature, the gap between the glass and the glass fixture is relatively large, resulting in large fluctuations in the dimensional appearance of the glass. Summary of the Invention

[0004] The main objective of this invention is to provide a glass product and its preparation method, a 3D hot-bent glass and its preparation method, and an electronic product, thereby solving the technical problem that glass is difficult to balance with a low coefficient of thermal expansion and a low softening point, resulting in poor performance of 3D hot-bent glass prepared by hot bending.

[0005] To achieve the above objectives, the present invention provides a glass article comprising, by weight percentage, the following components:

[0006] SiO2: 58%–65%;

[0007] Al2O3: 17%–23%;

[0008] Y2O3: 2%–7%;

[0009] ZrO2: 1%–3%;

[0010] La2O3: 0%–1%,

[0011] R2O: 7.8%–12.6%;

[0012] RO: 1.5%–2.9%;

[0013] The R2O is an alkali metal oxide;

[0014] The RO is an alkaline earth metal oxide;

[0015] Satisfies: A=(R2O+RO) / (Al2O3+Y2O3+ZrO2), A≥0.37.

[0016] In some embodiments of the present invention, the glass article, calculated by mass percentage, satisfies: 8.5% ≥ Y2O3 + ZrO2 + La2O3 ≥ 4%.

[0017] In some embodiments of the present invention, the R2O includes at least one of Li2O, Na2O, K2O, Rb2O, and Cs2O;

[0018] And / or, the RO includes at least one of MgO, CaO, and SrO.

[0019] In some embodiments of the present invention, the RO includes MgO, CaO, and SrO, and the mass percentage of MgO / (MgO+CaO+SrO) ≥ 0.63 is calculated.

[0020] In some embodiments of the present invention, the following is satisfied when calculated as a mole percentage:

[0021] B = 0.29N SiO2 -0.1N Al2O3 +3.27N R2O +1.51N RO -0.05N (ZrO2+Y2O3+La2O3) B≤80.06.

[0022] In some embodiments of the present invention, the expansion softening point Td of the glass article satisfies: 600℃≤Td≤705℃;

[0023] And / or, the coefficient of thermal expansion (CTE) of the glass article satisfies: 5.6 × 10⁻⁶ -6 / K≤CTE≤7.4×10 -6 / K.

[0024] The present invention also provides a method for preparing glass products, comprising the following steps: weighing glass raw materials according to the composition of the glass products as described above, and obtaining the glass products by melting, clarifying, shaping, annealing and cooling the glass raw materials.

[0025] The present invention also provides a 3D hot-bent glass, which is prepared by hot bending of the glass product as described above.

[0026] The present invention also provides a method for preparing 3D hot-bent glass, comprising the following steps: hot-bending the glass product as described above to obtain the 3D hot-bent glass.

[0027] In some embodiments of the present invention, during the hot bending process, the glass product is pressed into shape using a glass fixture to obtain the 3D hot-bent glass, wherein the glass fixture is made of graphite.

[0028] And / or, the hot bending temperature of the hot bending is 608℃~702℃.

[0029] The present invention also provides an electronic product comprising the 3D hot-bent glass described above.

[0030] The beneficial effects that this invention can achieve are:

[0031] This invention ensures that the prepared glass has a low softening point and a low coefficient of thermal expansion by adjusting the components and proportions of the glass product.

[0032] A lower expansion softening point allows glass to be hot-bent into the desired shape at lower temperatures, reducing the impact of high-temperature hot bending processes on the performance of 3D hot-bent glass and extending the service life of glass fixtures in the hot bending process.

[0033] A lower coefficient of thermal expansion can reduce the expansion of glass during hot bending, reduce the expansion space required for glass fixtures, reduce dimensional fluctuations of glass during hot bending, reduce the difficulty of hot bending, and ultimately improve the dimensional stability of 3D hot-bent glass. Detailed Implementation

[0034] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] In this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0037] This invention provides a glass article comprising, by weight percentage:

[0038] SiO2: 58%–65%;

[0039] Al2O3: 17%–23%;

[0040] Y2O3: 2%–7%;

[0041] ZrO2: 1%–3%;

[0042] La2O3: 0%–1%,

[0043] R2O: 7.8%–12.6%;

[0044] RO: 1.5%–2.9%;

[0045] The R2O is an alkali metal oxide;

[0046] The RO is an alkaline earth metal oxide.

[0047] This invention adds alkali metal oxides and alkaline earth metal oxides to glass products, which can effectively reduce the glass's softening point. However, the addition of alkali metal oxides and alkaline earth metal oxides can easily lead to an increase in the glass's coefficient of thermal expansion. Al2O3 affects the glass's network structure, which can reduce the glass's coefficient of thermal expansion and improve its chemical stability, thermal stability, and mechanical strength. However, excessive Al2O3 can easily lead to greater difficulty in melting the glass, a higher softening point (Td), and greater hot bending pressure. Therefore, it is not advisable to add too much. On the other hand, Y2O3 and ZrO2, as rare earth metal oxides, can effectively reduce the glass's melting temperature, improve its processing performance, enhance its mechanical properties, and simultaneously reduce its coefficient of thermal expansion. Therefore, alkali metal oxides, alkaline earth metal oxides, Al2O3, and rare earth metal oxides Y2O3 and ZrO2 can collectively affect the softening point and coefficient of thermal expansion of glass. To this end, the composition of glass products, calculated as a percentage by mass, should be controlled to satisfy: A = (R2O + RO) / (Al2O3 + Y2O3 + ZrO2), where A ≥ 0.37. For example, it can be 0.37, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, etc. This allows for a reduction in both the softening point and the coefficient of thermal expansion of the glass.

[0048] A lower expansion softening point allows glass to be hot-bent into the desired shape at lower temperatures, reducing the impact of high-temperature hot bending processes on the performance of 3D hot-bent glass and extending the service life of glass fixtures in the hot bending process.

[0049] A lower coefficient of thermal expansion can reduce the expansion of glass during hot bending, reduce the expansion space required for glass fixtures, reduce dimensional fluctuations of glass during hot bending, reduce the difficulty of hot bending, and ultimately improve the dimensional stability of 3D hot-bent glass.

[0050] The SiO2 introduced in this invention is a glass network forging, which can reduce the coefficient of thermal expansion of glass and improve its thermal stability, chemical stability, hardness, and mechanical strength. Excessive SiO2 content makes glass melting difficult and increases the glass's softening point (Td), leading to excessively high hot bending temperatures and affecting the forming of 3D hot-bent glass. Therefore, this invention controls the mass percentage of SiO2 to be 58%–65%.

[0051] The Al2O3 introduced in this invention exists in glass in two forms: aluminum-oxygen tetrahedra with a coordination number of 4 and aluminum-oxygen octahedra with a coordination number of 6. The aluminum-oxygen tetrahedra exist as network forgings in the glass, while the aluminum-oxygen octahedra exist as network intermediates. A small amount of Al2O3 can transform non-bridging oxygen in the glass into bridging oxygen, reducing the glass's coefficient of thermal expansion, reducing its crystallization tendency, and improving its chemical stability, thermal stability, mechanical strength, and hardness. However, excessive Al2O3 can lead to greater difficulty in melting the glass, a higher glass expansion softening point (Td), and higher hot bending pressure. Therefore, this invention controls the mass percentage of Al2O3 to be less than or equal to 23%, while maintaining a mass percentage greater than or equal to 17%, to maximize its role as a network intermediate.

[0052] Y₂O₃, as a rare earth metal oxide, can fill the gaps in the glass network, significantly increasing the density of the glass. Increased glass density significantly improves the mechanical strength of the original glass sheet. Furthermore, Y₂O₃ can significantly lower the glass melting temperature, facilitating glass melting, improving processing performance, and reducing the coefficient of thermal expansion, all without damaging the glass network structure. This is beneficial for producing high-strength glass substrates. Therefore, controlling the Y₂O₃ content to 2%–7%, i.e., 2%, 3%, 4%, 5%, 6%, and 7%, can effectively improve the mechanical properties of glass products while reducing the risk of crystallization.

[0053] ZrO2, as a rare earth metal oxide, can fill the gaps in the glass network, significantly increasing the density of the glass. Increased glass density significantly improves the mechanical strength of the original glass sheet. Furthermore, ZrO2 can significantly lower the glass melting temperature, which is beneficial for glass melting, improving glass processing performance and reducing the coefficient of thermal expansion, all without damaging the glass network structure. This is advantageous for preparing high-strength glass substrates. However, ZrO2 has relatively low solubility in glass, easily forming insoluble substances. Excessive ZrO2 concentration can also cause partial delamination and uneven composition during cooling. Therefore, the mass percentage of ZrO2 should be adjusted to 1%–3%.

[0054] La₂O₃, a rare-earth metal oxide, can fill the gaps in the glass network, significantly increasing the glass's density. This increased density significantly improves the mechanical strength of the original glass sheet. Furthermore, La₂O₃ can significantly lower the glass melting temperature, facilitating glass melting, improving processing performance, and reducing the coefficient of thermal expansion, all without disrupting the glass network structure. This is beneficial for producing high-strength glass substrates. However, the La₂O₃ cation La... 3+La2O3 has a relatively small ionic radius (103.2 pm) and a large charge, making it highly attractive for the aggregation of anionic clusters and prone to crystallization. Furthermore, as a typical glass nucleating agent, La2O3 also promotes crystallization during glass forming, leading to crystallization defects. Therefore, the La2O3 content is typically 0%–1%, with specific values ​​of 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, and 0.05%.

[0055] Y₂O₃, ZrO₂, and La₂O₃ are all rare earth metal oxides that can fill the gaps in the glass network, significantly increasing the density of the glass. This increased density, in turn, significantly improves the mechanical strength of the original glass sheet. Furthermore, Y₂O₃, ZrO₂, and La₂O₃ can significantly lower the glass melting temperature, which is beneficial for glass melting, improves glass processing performance, and reduces the coefficient of thermal expansion. Simultaneously, they do not damage the glass network structure, which is advantageous for preparing high-strength glass substrates.

[0056] In some embodiments, adjusting 8.5 ≥ Y2O3 + ZrO2 + La2O3 ≥ 4% not only helps improve the mechanical strength of the glass, lower the melting temperature of the glass, improve the processing performance of the glass and reduce the coefficient of thermal expansion of the glass, but also does not easily affect the low-temperature expansion softening point of the glass, and does not easily lead to problems such as uneven composition and delamination of the glass.

[0057] The R2O introduced in this invention is an alkali metal oxide. In some embodiments, R2O includes at least one of Li2O, Na2O, K2O, Rb2O, and Cs2O. The addition of alkali metal elements can significantly reduce the melting temperature of glass, which is beneficial for glass homogenization and clarification, while also lowering the glass's expansion and softening point. However, alkali metals mainly disrupt the silicon-oxygen tetrahedral structure of glass. Adding too much alkali metal can lead to an incomplete glass network structure, a high coefficient of thermal expansion, and problems such as poor chemical stability, poor weather resistance, and poor mechanical strength. Therefore, this invention controls the R2O content to be within the range of 7.8% to 12.6%.

[0058] The RO introduced in this invention is an alkaline earth metal oxide. Alkaline earth metals can lower the melting temperature of glass, change the glass material properties, make the glass easier to form, and give the glass a lower expansion and softening point. However, if the content of alkaline earth metal oxides is too high, it will affect other properties of the glass, such as increasing the coefficient of thermal expansion and making the glass brittle. Therefore, the RO content is controlled at 1.5% to 2.9% by mass percentage, and can be 1.5%, 1.6%, 1.8%, 2.0%, 2.2%, 2.5%, 2.6%, 2.8%, 2.9%, etc.

[0059] In some embodiments, RO comprises at least one of MgO, CaO, and SrO. Alkali earth metals can lower the melting temperature of glass, alter the properties of the glass material, make the glass easier to form, and give the glass a lower expansion softening point.

[0060] In glass, MgO mainly functions to increase high-temperature viscosity and decrease low-temperature viscosity, thereby improving the properties of the glass material and facilitating glass forming. Therefore, if RO includes MgO, the MgO content should be controlled between 1.2% and 3.0%, which can be 1.2%, 1.5%, 1.8%, 2.0%, 2.5%, 3.0%, etc.

[0061] CaO and SrO mainly function to reduce high-temperature viscosity and increase low-temperature viscosity in glass. However, excessive CaO content can make the glass brittle. Therefore, if RO includes MgO, the CaO content should be controlled to ≤1% and the SrO content to ≤0.5% by mass percentage. That is, the CaO content can be 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0.08%, 0.05%, 0.04%, 0.01%, etc., and the SrO content can be 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0.09%, 0.07%, 0.05%, 0.04%, 0.03%, 0.02%, 0.01%, etc.

[0062] In glass, MgO mainly plays a role in increasing high-temperature viscosity and decreasing low-temperature viscosity, thereby improving the glass's properties and facilitating glass forming. CaO and SrO mainly play a role in decreasing high-temperature viscosity and increasing low-temperature viscosity. However, if the CaO content is too high, the glass becomes brittle, which can affect its mechanical properties. Therefore, in some embodiments, the mass percentage of MgO / (MgO+CaO+SrO) is calculated to be ≥0.63, more preferably 0.63 to 1, and can be 0.63, 0.65, 0.7, 0.75, 0.8, 0.9, 1.0, etc. This can reduce the glass's expansion and softening point while ensuring its mechanical strength.

[0063] In some embodiments, B = 0.29N is satisfied as a molar percentage. SiO2 -0.1N Al2O3 +3.27N R2O +1.51N RO-0.05N(ZrO2+Y2O3+La2O3), B≤80.06, which can be 80.06, 80.05, 80.00, 79.50, 79.00, 78.50, 78.00, 75.00, 72.00, 70.00, 65.00, 62.00, etc. In this way, sufficient alkaline earth metal oxides and alkali metal oxides can be added to achieve a low softening point for the glass, while also effectively reducing the coefficient of thermal expansion, thus achieving a balance between a low softening point and a low coefficient of thermal expansion.

[0064] In some embodiments, the expansion softening point Td of the glass product satisfies: 600℃ ≤ Td ≤ 705℃. For example, Td can be 600℃, 608℃, 610℃, 620℃, 630℃, 640℃, 650℃, 660℃, 670℃, 680℃, 690℃, 700℃, 701℃, 702℃, 705℃, etc. A lower expansion softening point Td allows the glass to be hot-bent at lower temperatures to obtain the desired 3D hot-bent glass, reducing the impact of high-temperature hot-bending processes on the performance of 3D hot-bent glass.

[0065] In some embodiments, the coefficient of thermal expansion (CTE) of the glass article satisfies: 5.6 × 10⁻⁶ -6 / K≤CTE≤7.4×10 -6 / K, for example, CTE could be 5.6 × 10 -6 / K, 5.624×10 -6 / K, 5.630×10 -6 / K, 5.640×10 -6 / K, 5.650×10 -6 / K、5.680×10 -6 / K, 5.690×10 -6 / K、6.000×10 -6 / K、6.200×10 -6 / K, 6.500×10 -6 / K, 6.700×10 -6 / K、6.800×10 -6 / K、6.900×10 -6 / K、7.000×10 -6 / K、7.100×10 -6 / K、7.200×10 -6 / K、7.300×10 -6 / K, 7.330×10 -6 / K, 7.4×10 -6 / K etc. A lower coefficient of thermal expansion can reduce the expansion of glass during the hot bending process, thereby reducing the expansion space required for glass fixtures, thus reducing dimensional fluctuations of glass during hot bending, reducing the difficulty of hot bending, and ultimately improving the dimensional stability of 3D hot-bent glass.

[0066] The present invention also provides a method for preparing glass products, comprising the following steps: weighing glass raw materials according to the composition of the glass products, and obtaining glass products by melting, clarifying, shaping, annealing and cooling the glass raw materials.

[0067] The present invention also provides a 3D hot-bent glass, which is prepared by hot-bending the above-mentioned glass product.

[0068] The present invention also provides a method for preparing 3D hot-bent glass, comprising the following steps: hot-bending the glass product as described above to obtain 3D hot-bent glass.

[0069] The expansion softening point temperature of glass is approximately the temperature required for hot bending of glass. This invention adjusts the composition of the glass product to obtain a lower expansion softening point. Therefore, hot bending can be achieved at a lower temperature to obtain 3D hot-bent glass of the desired shape.

[0070] In some embodiments, the hot bending temperature is 608°C to 702°C, while the hot bending temperature of existing low-expansion glass is typically around 800°C.

[0071] In some embodiments, the 3D hot-bent glass is obtained by pressing a glass article into shape using a glass jig. For example, in the manufacture of cover glass for electronic products, the glass is mainly processed into the desired shape by molding.

[0072] The molds used in compression molding are typically made of graphite; therefore, in some embodiments, the glass fixture is made of graphite. However, graphite has a very low coefficient of thermal expansion, typically -5 × 10⁻⁵. -6 / ℃~2.0×10 -6 Between ℃ and ℃, during room temperature feeding, a large gap needs to be reserved between the glass edge and the graphite fixture to allow for glass expansion. The larger the gap, the greater the dimensional fluctuation of the glass after hot pressing. This invention adjusts the composition of the glass product to achieve a lower coefficient of thermal expansion, making it compatible with graphite fixtures that also have a low coefficient of thermal expansion. During hot bending, the expansion space required by the glass fixture is reduced, minimizing dimensional fluctuations and resulting in dimensionally stable and high-quality 3D hot-bent glass.

[0073] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0074] Supporting evidence

[0075] S10. Weigh the glass raw materials according to the molar percentage of glass products in groups A, B, C, D, E and F in Table 1.

[0076] S20. Glass products are obtained by melting, clarifying, shaping, annealing and cooling glass raw materials.

[0077] Performance testing

[0078] 1. Determine the melting temperature Tm of the glass product. Tm represents the temperature at which the glass melts and clarifies, and bubbles can be expelled. Test method: The test is conducted using the ASTM C-965 rotating high-temperature viscometer method.

[0079] Table 1

[0080] molar ratio (mol%) A B C D E F <![CDATA[SiO2]]> 66.82 66.68 66.54 66.68 66.68 66.68 <![CDATA[Al2O3]]> 11.35 11.33 11.31 11.33 11.33 11.33 <![CDATA[Na2O]]> 4.47 4.46 4.45 4.46 4.46 4.46 <![CDATA[K2O]]> 1.50 1.50 1.50 1.50 1.50 1.50 MgO 3.82 3.81 3.80 3.81 3.81 3.81 <![CDATA[Li2O]]> 10.31 10.29 10.27 10.29 10.29 10.29 <![CDATA[ZrO2]]> 0.65 0.65 0.65 0.65 0.65 0.85 CaO 0.20 <![CDATA[Y2O3]]> 1.08 1.28 1.48 1.08 1.08 1.08 <![CDATA[La2O3]]> 0.20 total 100.00 100.00 100.00 100.00 100.00 100.00 Melting temperature Tm (°C) 1628 1613 1601 1609 1615 1625

[0081] From Table 1, we can see that:

[0082] Groups A through F all added alkaline earth metal oxides and alkali metal oxides, resulting in glass products with lower melting temperatures and glass expansion and softening points between 608℃ and 702℃.

[0083] Groups B and C increased the amount of Y2O3 compared to group A, and both reduced the glass melting temperature Tm.

[0084] Group D, compared to Group A, increased La2O3, which lowered the glass melting temperature Tm.

[0085] Group E, compared to Group A, had an increase in CaO, which lowered the glass melting temperature Tm.

[0086] Group F had a higher ZrO2 content than Group A, and also lowered the glass melting temperature Tm.

[0087] Therefore, it can be seen that the addition of Y2O3, CaO, La2O3, and ZrO2, as well as the appropriate increase in their content, can effectively reduce the melting temperature of glass.

[0088] Supporting examples demonstrate that Y2O3, CaO, La2O3, and ZrO2 can effectively reduce the melting temperature Tm of glass, improve its processing performance, and enhance its mechanical properties.

[0089] Example 1

[0090] The preparation method of the 3D hot-bent glass in Example 1 is as follows:

[0091] S10. Weigh the glass raw materials according to the mass percentage and molar percentage of glass products in Table 2.

[0092] S20. Glass raw materials are melted, clarified, shaped, annealed, and cooled to obtain glass substrates;

[0093] S30. The glass substrate is heated and softened, placed in a graphite fixture mold, and then cooled to obtain 3D hot-bent glass.

[0094] Performance testing

[0095] 1. Determine the expansion and softening point temperature (Td) of glass products before hot bending. Td represents the initial temperature at which hollow and vertical glass begins to deform when heated, and is the glass annealing limit temperature. Test method: The Td value is determined using an ASTM E-228 coefficient of thermal expansion tester.

[0096] 2. Determine the coefficient of thermal expansion (CTE) of the glass product before hot bending. CTE is a physical quantity that represents the degree of linear expansion of glass under temperature changes. Test method: Measure the CTE value using an ASTM E-228 coefficient of thermal expansion meter.

[0097] 3. Determine the Mohs hardness of the 3D hot-bent glass. Test each example and comparative example 10 times, take the average value, and record it in Table 1.

[0098] Table 2

[0099]

[0100]

[0101] As can be seen from Examples 1 to 9, the present invention effectively reduces the melting temperature and softening point temperature of glass by adding alkali metal oxides and alkaline earth metal oxides. However, the addition of alkali metal oxides and alkaline earth metal oxides will affect the coefficient of thermal expansion of glass to a certain extent. Therefore, by adjusting the composition and component ratio of the glass product, the coefficient of thermal expansion of glass can be reduced while reducing the softening point temperature of glass.

[0102] A lower thermal expansion softening point (Td) allows glass to be hot-bent at lower temperatures to obtain the desired 3D hot-bent glass shape. This reduces the impact of high-temperature hot bending processes on the performance of 3D hot-bent glass. A lower coefficient of thermal expansion reduces the expansion of glass during hot bending, reduces the expansion space required for glass fixtures, reduces dimensional fluctuations during hot bending, and lowers the difficulty of hot bending, ultimately improving the dimensional stability of 3D hot-bent glass.

[0103] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made using the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A glass article, characterized in that, Calculated by mass percentage, it includes the following components: SiO2: 58%~65%; Al2O3: 17%~23%; Y2O3: 2%~7%; ZrO2: 1%~3%; La2O3: 0%~1%, R2O: 7.8%~12.6%; RO: 1.5%~2.9%; The R2O is an alkali metal oxide; The RO is an alkaline earth metal oxide; Satisfies: A = (R2O + RO) / (Al2O3 + Y2O3 + ZrO2), A ≥ 0.

37.

2. The glass article according to claim 1, characterized in that, The glass product, calculated as a percentage by mass, satisfies the following condition: 8.5% ≥ Y₂O₃ + ZrO₂ + La₂O₃ ≥ 4%.

3. The glass article according to claim 1, characterized in that, The R2O includes at least one of Li2O, Na2O, K2O, Rb2O, and Cs2O; And / or, the RO includes at least one of MgO, CaO, and SrO.

4. The glass article according to claim 3, characterized in that, The RO includes at least one of MgO, CaO, and SrO, and is calculated by mass percentage to satisfy MgO / (MgO+CaO+SrO)≥0.

63.

5. The glass article according to any one of claims 1 to 4, characterized in that, Based on mole percentage, the following conditions are met: B = 0.29N SiO2 - 0.1N Al2O3 + 3.27N R2O + 1.51N RO - 0.05N (ZrO2＋Y2O3＋La2O3) B < 80.

06.

6. The glass article according to claim 5, characterized in that, The expansion softening point Td of the glass product satisfies: 600℃≤Td≤705℃; And / or, the coefficient of thermal expansion (CTE) of the glass article satisfies: 5.6 × 10⁻⁶ -6 / K ≤CTE≤7.4×10 -6 / K.

7. A method for preparing a glass article, characterized in that, The process includes the following steps: weighing glass raw materials according to the composition of the glass article as described in any one of claims 1 to 6, and obtaining the glass article by melting, clarifying, shaping, annealing and cooling the glass raw materials.

8. A 3D hot-bent glass, characterized in that, The 3D hot-bent glass is prepared by hot bending the glass product as described in any one of claims 1 to 6.

9. A method for preparing 3D hot-bent glass, characterized in that, Includes the following steps: The 3D hot-bent glass is obtained by hot bending the glass article as described in any one of claims 1 to 6.

10. The method for preparing 3D hot-bent glass according to claim 9, characterized in that, During the hot bending process, the glass product is pressed into shape using a glass fixture to obtain the 3D hot-bent glass. The glass fixture is made of graphite. And / or, the hot bending temperature of the hot bending is 608℃~702℃.

11. An electronic product, characterized in that, The electronic product includes the 3D hot-bent glass as described in claim 8.

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