A fabrication process for 3D curved glass

Abstract

This invention relates to the field of glass technology, and more particularly to a process for preparing 3D curved glass. The process includes the following steps: S1, mixing boron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, cerium oxide, samarium oxide, and ytterbium oxide, grinding and sieving them until uniformly mixed, and heating to obtain a liquid phase; S2, clarifying the liquid phase, guiding the clarified liquid phase into a mold cavity, and hot-bending it to obtain a rough blank; S3, annealing the rough blank, and refining it to obtain the 3D curved glass. The curved glass provided by this invention has excellent mechanical properties, strong impact resistance, and uniform display without deformation or distortion.

Description

Technical Field

[0001] This invention belongs to the field of glass technology, and in particular relates to a process for preparing 3D curved glass. Background Technology

[0002] Curved glass refers to glass with a curved surface, capable of forming various arcs and curves in two-dimensional or three-dimensional space. The curvature can be single or multiple, giving products a unique appearance and feel. Common curved glass can be divided into 2D curved glass, 2.5D curved glass, and 3D curved glass. 2D curved glass has a curvature on only one plane; 2.5D curved glass is based on flat glass, with the edges polished to a certain curvature to give them a curved shape; 3D curved glass refers to glass with curved designs in the middle and edges, presenting a complex three-dimensional curved surface. Widely used in devices such as smartphones, tablets, and smartwatches, curved glass, as a screen cover or shell, not only provides better visual effects and touch experience, but also makes products thinner, lighter, and more aesthetically pleasing, enhancing their competitiveness and added value. In lenses for virtual reality (VR) / augmented reality (AR) devices and smart glasses, curved glass can better conform to the curves of the human face, providing a wider field of vision and a comfortable wearing experience. It also helps to achieve miniaturization and weight reduction of devices. The applications of curved glass are extremely wide.

[0003] Despite strengthening treatments, glass remains inherently brittle. Curved glass, due to its unique shape and larger surface area, is more prone to breakage when subjected to external impacts. Furthermore, its relatively soft surface makes it easily scratched by hard objects such as metal and gravel, affecting both aesthetics and usability. Additionally, curved glass causes light refraction and reflection, resulting in visual distortion. When displaying images or text, this can lead to deformation and distortion, impacting the viewing experience.

[0004] For example, CN117776536A discloses a 3D curved surface microcrystalline glass, a chemically strengthened microcrystalline glass, its preparation method and application, wherein the composition of the 3D curved surface microcrystalline glass, based on the molar percentage of oxides, satisfies the following:

[0005] 0.180≤5×P2O5 / (Li2O+0.5Al2O3)≤0.250;

[0006] 18.200≤Li2O / P2O5≤25.500;

[0007] 0.100≤P2O5×(CaO+ZrO2+Li2O+A l2 O3) / (Na2O+K2O+B2O3)≤2.20;

[0008] 1.500≤10×(ZrO2+P2O5) / Li2O≤2.000;

[0009] 4.000≤(SiO2—7Al2O3—Li2O) / (P2O5+ZrO2)≤6.000.

[0010] This application achieves the goal of uniform display through the synergistic effect of multiple oxides, but the excessive content of alumina, a typical crystalline oxide, does not have good crystal plane dispersion impact force, thus the glass is relatively brittle.

[0011] For example, CN114538773A discloses a rare-earth element Sm-doped borophosphate luminescent glass and its preparation method. The raw materials of the luminescent glass are composed of P2O5, H3BO3, CdF2, ZnO, and MgO, wherein P2O5 is 5-15%, H3BO3 is 5-60%, CdF2 is 1-10%, ZnO is 10-20%, and MgO is 5-15%; the rare-earth oxide is Sm2O3, with a mass percentage of 0.05-2%. This application uses the rare-earth element Sm as a luminescent agent to prepare borophosphate luminescent glass, mainly for use in the field of orange-red lasers. However, simply adding Sm ions makes it difficult to achieve ideal uniformity in the distribution of Sm ions in the glass, easily leading to local enrichment or concentration gradients. This results in differences in refractive index in different parts of the glass, thus affecting the overall stability of the glass's refractive index and consequently reducing the glass's optical quality and performance.

[0012] In view of this, the present invention is hereby proposed. Summary of the Invention

[0013] The purpose of this invention is to provide a manufacturing process for 3D curved glass. The curved glass provided by this invention has excellent mechanical properties, strong impact resistance, and uniform display without deformation or distortion.

[0014] To achieve the above objectives, the present invention provides the following technical solution:

[0015] In a first aspect, embodiments of the present invention provide a process for preparing 3D curved glass, comprising the following steps:

[0016] S1, Boron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, cerium oxide, samarium oxide and ytterbium oxide are mixed, ground and sieved to form a homogeneous mixture, and then heated to obtain a liquid phase.

[0017] S2, clarify the liquid phase, guide the clarified liquid phase into the mold cavity, hot bend it to form a rough blank;

[0018] S3, the blank is annealed and then refined to obtain the 3D curved glass.

[0019] This invention combines various rare earth oxides, resulting in a colorless glass. Furthermore, by adjusting the ratio of rare earth oxides to boron trioxide, ammonium dihydrogen phosphate, lithium oxide, and calcium carbonate, the mechanical properties of the glass are improved, and the glass exhibits uniformity without deformation or distortion.

[0020] This is mainly because boron trioxide is a glass network forger, capable of forming a network structure with other components in the glass. In glass, boron atoms can combine with oxygen atoms to form two coordination structures: [BO3] and [BO4]. [BO3] is a planar triangular structure, while [BO4] is a tetrahedral structure. This structure enhances the network strength of the glass, making its structure more compact, thereby improving its hardness and mechanical properties such as elastic modulus. Furthermore, boron trioxide can reduce the coefficient of thermal expansion of glass. A smaller coefficient of thermal expansion means less volume change and less internal stress during temperature changes, which helps improve the glass's thermal shock resistance and indirectly enhances its mechanical stability. The added ammonium dihydrogen phosphate decomposes during the glass melting process, producing ammonia and phosphoric acid. The escape of ammonia leaves tiny pores in the glass; these pores can act as a buffer, absorbing some energy and improving the glass's toughness. Furthermore, phosphorus can enter the boron trioxide-formed glass network structure to form PO bonds. The presence of these bonds can alter the glass network structure, increase the degree of cross-linking, improve the hardness and flexural strength of the glass, and also contribute to its chemical stability, indirectly having a positive impact on mechanical properties. Lithium oxide is an effective flux that can lower the melting temperature of glass. The various rare earth oxides compounded in this invention have relatively high melting points, thus lowering the melting point allows the glass to melt and form at a lower temperature. In the glass structure, lithium ions can fill the gaps in the glass network, acting as a network disruptor and making the glass network structure more porous. This structural change reduces the hardness of the glass to some extent, but it also increases its toughness, making it less brittle and improving its impact resistance. More importantly, lithium oxide can improve the thermal stability of the glass, reducing the internal stress generated when the glass changes temperature, thereby improving the glass's thermal shock resistance. Similarly, the added calcium carbonate decomposes into calcium oxide and carbon dioxide during the glass melting process. Calcium oxide can act as a glass network modifier, combining with the glass network structure formed by boron trioxide to increase the connectivity of the glass network and improve the hardness and strength of the glass. Simultaneously, the escape of carbon dioxide creates tiny pores in the glass, enhancing its sound absorption and heat insulation properties, and to some extent improving its toughness and impact resistance. Furthermore, during annealing and cooling processes, the calcium oxide added in this invention promotes crystal nucleation, leading to crystallization in the glass. Appropriate crystallization can improve the mechanical properties of the glass, such as making it denser and increasing its hardness and strength. The rare earth oxides compounded in this invention play an indispensable role in the forming process. Firstly, cerium oxide acts as a clarifying agent during glass melting, reducing the viscosity of the molten glass, promoting the removal of bubbles, and resulting in a more uniform glass.A uniform glass structure contributes to improved mechanical properties because the bubbles formed by ammonium dihydrogen phosphate and calcium carbonate are within a controllable range, avoiding stress concentration caused by defects such as bubbles and impurities. This ensures both strength and toughness of the glass. Furthermore, cerium oxide enhances the chemical stability of the glass, reducing corrosion and degradation in the environment. Samarium oxide can enter the network structure formed by boron trioxide and interact with other ions in the glass, strengthening the network's connection strength and density, increasing the glass's density and hardness. When the glass is subjected to external impact, samarium ions absorb some energy and dissipate it through processes such as electron transitions. This energy absorption mechanism can improve the glass's impact resistance to a certain extent, making it less prone to breakage. Similarly, ytterbium oxide can act as a glass network modifier. After entering the glass network, ytterbium ions form chemical bonds with other ions, making the network more compact and increasing the glass's hardness and elastic modulus. Simultaneously, ytterbium oxide also improves the glass's wear resistance, making the glass surface more durable. Furthermore, the rare earth oxides compounded in this invention can avoid the color effects of single rare earth oxides, such as the pale blue of ytterbium oxide, the pale yellow of cerium oxide, and the slightly yellowish white of samarium oxide. In the principle of color mixing, yellow is equivalent to red and green, and red, green, and blue can be compounded to obtain white, i.e., transparent.

[0021] Furthermore, the rare earth oxides compounded in this invention can improve the uniformity of glass displays by controlling the optical constants of the glass, improving the purity and uniformity of the glass, and enhancing the glass's radiation resistance and weather resistance.

[0022] In controlling the optical constants of glass, cerium oxide, with its high refractive index, can alter the glass's refractive index to better match that of surrounding glass, reducing light scattering and refraction within the glass and thus improving its optical uniformity, which in turn enhances reflection uniformity. Samarium oxide, to some extent, can adjust the glass's refractive index and dispersion, resulting in more uniform reflection and refraction characteristics for different wavelengths of light, contributing to improved reflection uniformity across the visible spectrum. Furthermore, ytterbium oxide also has a moderating effect on the glass's refractive index, making its optical properties more stable and uniform, reducing uneven light reflection caused by refractive index differences. The three rare earth oxides compounded in this invention result in a uniform and consistent curved glass surface.

[0023] In improving the purity and uniformity of glass, cerium oxide, as a glass clarifying agent, decomposes at high temperatures during the glass melting process, releasing oxygen that oxidizes impurities in the glass, reducing coloration and improving transparency and purity. This promotes uniform light transmission and reflection, thereby enhancing the glass's reflectivity. Samarium oxide, with its high chemical stability and purity, is less likely to introduce impurities during glassmaking, contributing to overall purity and uniformity and providing a foundation for good reflectivity uniformity. Ytterbium oxide can refine glass grains, inhibiting abnormal grain growth during manufacturing, resulting in a more uniform microstructure and thus improving optical and reflectivity uniformity.

[0024] In enhancing the radiation resistance and weather resistance of glass, cerium oxide possesses excellent ultraviolet (UV) absorption capabilities, absorbing UV rays and converting them into heat energy that is dissipated, thus reducing UV damage to the glass, improving its UV resistance, protecting the stability of the glass's internal structure, and helping to maintain the uniformity of its reflective properties. Samarium oxide absorbs infrared radiation, reducing the thermal effect of infrared radiation on the glass, and mitigating the uneven expansion and contraction caused by temperature changes, thereby improving the dimensional stability and reflective uniformity of the glass. Ytterbium oxide improves the chemical corrosion resistance and oxidation resistance of glass, enhancing its stability under different environmental conditions, preventing changes in reflective properties due to external erosion, and ensuring the long-term stability of the glass's reflective uniformity.

[0025] In a preferred embodiment, in step S1, the mass ratio of boron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, cerium oxide, samarium oxide and ytterbium oxide is (50-70):(5-10):(10-30):(5-10):(1-3):(1-3):(2-6).

[0026] In a preferred embodiment, in step S1, the ground mixture is passed through a 300-500 mesh sieve.

[0027] In a preferred embodiment, in step S1, the heating temperature is 1000-1200℃, and the heating time is 1-4 hours.

[0028] In a preferred embodiment, in step S2, the clarification is performed using a clarifying agent, wherein the amount of the clarifying agent added is in a mass ratio of 1:(30-60) to the liquid phase, and the clarifying agent comprises a mixture of cerium oxide, calcium fluoride and sodium chloride, wherein the mass ratio of cerium oxide, calcium fluoride and sodium chloride is 1:(1-2):(1-2).

[0029] In a preferred embodiment, the clarifying agent is prepared as follows:

[0030] Cerium oxide, calcium fluoride, and sodium chloride are calcined at 800-1000℃ for 2-4 hours to obtain a clarifying agent.

[0031] The clarifying agent formulated in this invention further addresses the shortcomings of high bubble content and high viscosity in the curved glass produced by this invention. Both calcium fluoride and sodium chloride reduce the viscosity of the glass melt. When used simultaneously, this viscosity-reducing effect is synergistic, resulting in an even lower melt viscosity. Lower viscosity provides more favorable conditions for the removal of gaseous impurities, allowing gases to escape from the melt more quickly and smoothly, significantly improving clarification efficiency. Cerium oxide releases oxygen to oxidize impurities and produce carbon dioxide, while sodium chloride and calcium fluoride reduce viscosity and promote gas removal. Furthermore, the volatile gases produced by the reaction of calcium fluoride and the volatile impurity salts formed by sodium chloride, along with the carbon dioxide produced by cerium oxide, can be more effectively removed from the glass melt in a low-viscosity melt environment, resulting in clearer glass. The stable oxidation environment provided by cerium oxide, the adjustment of the glass network structure by calcium oxide generated by calcium fluoride, and the potential influence of sodium chloride dissociated ions on the glass structure—these three factors work synergistically to maintain good structural stability of the glass during the clarification process. A stable structure helps prevent new gaseous impurities from entering the glass interior and also helps maintain good quality and optical properties after clarification.

[0032] In a preferred embodiment, step S2 involves the following specific steps for hot bending:

[0033] Under a pressure of 0.1-0.4 MPa, the liquid phase was kept at 800-900℃ for 1-2 hours to obtain a rough embryo.

[0034] In a preferred embodiment, in step S3, the blank needs to be crystallized before annealing.

[0035] In a preferred embodiment, the specific steps of the crystallization treatment are as follows:

[0036] The blank is cooled to release thermal stress to room temperature at a rate of 1-3℃ / min. Then, the blank is heated to 400-600℃ at a rate of 2-5℃ / min and held for 2-4 hours to obtain a crystallized blank.

[0037] In this invention, the rough blank is crystallized, which enhances the mechanical properties and thermal stability of the glass. Furthermore, the distribution of each component after crystallization is more uniform, thereby enhancing the transparency and gloss of the glass.

[0038] During crystallization, boron trioxide provides a suitable framework for the crystallization of other substances, contributing to the formation of a more regular and stable crystalline structure. Cerium oxide, with its fluorite-type crystal structure and cubic symmetry, acts as a nucleus during glass crystallization, inducing other components in the glass to crystallize around it, promoting the crystallization process, increasing crystallization efficiency, and enhancing the overall structural stability of the glass. After crystallization, samarium oxide and ytterbium oxide ions enter the glass lattice, causing lattice distortion and increasing the complexity and stability of the glass structure. This lattice distortion hinders dislocation movement, making the glass less prone to deformation and breakage, thus improving its mechanical strength and thermal stability.

[0039] In a preferred embodiment, step S3, the annealing process specifically includes:

[0040] The blank is cooled to release thermal stress to room temperature at a rate of 1-3°C / min.

[0041] Secondly, embodiments of the present invention provide a 3D curved glass obtained by the preparation process of the 3D curved glass described above.

[0042] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0043] 1. This invention combines various rare earth oxides, which makes the glass colorless. Furthermore, by adjusting the ratio of rare earth oxides with boron trioxide, ammonium dihydrogen phosphate, lithium oxide, and calcium carbonate, the mechanical properties of the glass are improved, and the glass displays uniformly without deformation or distortion.

[0044] 2. The rare earth oxides compounded in this invention can improve the uniformity of glass display by controlling the optical constants of the glass, improving the purity and uniformity of the glass, and enhancing the radiation resistance and weather resistance of the glass.

[0045] 3. The clarifying agent compounded in this invention further ensures that the curved glass compounded in this invention has the disadvantages of many bubbles and high viscosity. The stable structure helps to prevent new gaseous impurities from entering the glass and also helps the glass maintain good quality and optical performance after clarification.

[0046] 4. The present invention crystallizes the glass, which enhances the glass's mechanical properties and thermal stability. Furthermore, the crystallized components are more evenly distributed, thus enhancing the glass's transparency and gloss. Detailed Implementation

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Unless otherwise specified, all raw materials and reagents used in this invention are commercially available.

[0049] Example 1

[0050] This embodiment provides a fabrication process for 3D curved glass, including the following steps:

[0051] S1, Boron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, cerium oxide, samarium oxide and ytterbium oxide are mixed and ground through a 300-mesh sieve and then mixed evenly. The mass ratio of boron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, cerium oxide, samarium oxide and ytterbium oxide is 68.5:8:17:6:2:2:4. The mixture is heated to 1100℃ and kept at that temperature for 2 hours to obtain a liquid phase.

[0052] S2. Clarify the liquid phase using a clarifying agent. Specifically, mix the liquid phase with the clarifying agent and keep it at 500°C for 2 hours. The mass ratio of the clarifying agent to the liquid phase is 1:40. Guide the clarified liquid phase into the mold cavity of the 3D curved glass and keep it at 850°C for 1 hour under a pressure of 0.1 MPa to obtain a rough blank.

[0053] The preparation method of the clarifying agent is as follows:

[0054] By weight, 1 part cerium oxide, 1.5 parts calcium fluoride and 1.5 parts sodium chloride are calcined at 900℃ for 3 hours to obtain a clarifying agent;

[0055] S3, the rough blank is cooled to release thermal stress to room temperature at a cooling rate of 1℃ / min, and the 3D curved glass is obtained after fine finishing.

[0056] Example 2

[0057] This embodiment provides a fabrication process for 3D curved glass, including the following steps:

[0058] S1, Boron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, cerium oxide, samarium oxide and ytterbium oxide are mixed and ground through a 300-mesh sieve and then mixed evenly. The mass ratio of boron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, cerium oxide, samarium oxide and ytterbium oxide is 68.5:8:17:6:2:2:4. The mixture is heated to 1100℃ and kept at that temperature for 2 hours to obtain a liquid phase.

[0059] S2. Clarify the liquid phase using a clarifying agent. Specifically, mix the liquid phase with the clarifying agent and keep it at 500°C for 2 hours. The mass ratio of the clarifying agent to the liquid phase is 1:40. Guide the clarified liquid phase into the mold cavity of the 3D curved glass and keep it at 850°C for 1 hour under a pressure of 0.1 MPa to obtain a rough blank.

[0060] The preparation method of the clarifying agent is as follows:

[0061] By weight, 1 part cerium oxide, 1.5 parts calcium fluoride and 1.5 parts sodium chloride are calcined at 900℃ for 3 hours to obtain a clarifying agent;

[0062] S3, the blank is cooled to release thermal stress to room temperature at a cooling rate of 1℃ / min. Then, the blank is heated to 500℃ at a heating rate of 5℃ / min and held at that temperature for 6 hours to obtain a crystallized blank. The crystallized blank is then cooled to release thermal stress to room temperature at a cooling rate of 1℃ / min. After fine finishing, the 3D curved glass is obtained.

[0063] Comparative Example 1

[0064] The difference between this comparative example and Example 1 is that cerium oxide is not added, and the mass ratio of boron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, samarium oxide and ytterbium oxide is changed to 68.5:8:17:6:3:5.

[0065] Comparative Example 2

[0066] The difference between this comparative example and Example 1 is that samarium oxide is not added, and the mass ratio of boron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, cerium oxide and ytterbium oxide is changed to 68.5:8:17:6:3:5.

[0067] Comparative Example 3

[0068] The difference between this comparative example and Example 1 is that ytterbium oxide is not added, and the mass ratio of boron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, cerium oxide, and samarium oxide is 68.5:8:17:6:3:3.

[0069] Comparative Example 4

[0070] The difference between this comparative example and Example 1 is that ytterbium oxide, samarium oxide, and ytterbium oxide are not added, and the mass ratio of boron trioxide, ammonium dihydrogen phosphate, lithium oxide, and calcium carbonate is 76.5:8:17:6.

[0071] Comparative Example 5

[0072] The difference between this comparative example and Example 1 is that ammonium dihydrogen phosphate is not added, and the mass ratio of boron trioxide, lithium oxide, calcium carbonate, cerium oxide, samarium oxide and ytterbium oxide is 76.5:17:6:2:2:4.

[0073] Comparative Example 6

[0074] The difference between this comparative example and Example 1 is that lithium oxide is not added, and the mass ratio of boron trioxide, ammonium dihydrogen phosphate, calcium carbonate, cerium oxide, samarium oxide and ytterbium oxide is 85.5:8:6:2:2:4.

[0075] Comparative Example 7

[0076] The difference between this comparative example and Example 1 is that calcium carbonate is not added, and the mass ratio of boron trioxide, ammonium dihydrogen phosphate, lithium oxide, cerium oxide, samarium oxide and ytterbium oxide is 74.5:8:17:2:2:4.

[0077] Comparative Example 8

[0078] The difference between this comparative example and Example 1 is that no clarifying agent is used to clarify the liquid phase.

[0079] Comparative Example 9

[0080] The difference between this comparative example and Example 1 is that the clarifying agent is replaced with cerium oxide.

[0081] Performance testing

[0082] 1. The impact resistance of curved glass was determined by referring to the test examples and comparative examples in GB / T 39814-2021. The ball mass was 0.5kg, 2kg, and 5kg, and the test was performed 5 times each time. The cracking was observed and the results are shown in Table 1.

[0083] 2. The hardness of the curved glass obtained in the examples and comparative examples was tested according to the Mohs hardness test method. The results are shown in Table 1.

[0084] 3. Color test: The curved glass obtained from the examples and comparative examples and the standard colorless glass sample were placed under the same light source and their color rendering was observed. The results are shown in Table 1.

[0085] 4. The light transmittance of the curved glass was obtained by referring to the test examples and comparative examples in GB / T 40415-2021. The results are shown in Table 1.

[0086] Table 1 Performance Test Results

[0087]

[0088] The performance test results above show that Examples 1-2 exhibit the best mechanical properties and transparency, particularly superior impact resistance and light transmittance. Example 2, in particular, demonstrates the most outstanding overall performance. This is mainly due to the synergistic effect of the various components and rare earth oxides in this invention, and the formulated clarifying agent eliminates the adverse effects of ammonium dihydrogen phosphate and calcium carbonate, further enhancing the strength of the curved glass. In contrast, the comparative examples, lacking the necessary technical solutions, show significantly inferior performance compared to the examples in the relevant tests. This further demonstrates the irreplaceable nature of the specific technical solutions in this application for achieving the desired technical effects and solving the technical problems.

[0089] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A process for preparing 3D curved glass, characterized in that, Includes the following steps: S1, Boron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, cerium oxide, samarium oxide and ytterbium oxide are mixed in a mass ratio of (50-70):(5-10):(10-30):(5-10):(1-3):(1-3):(2-6) and ground, sieved and mixed evenly, and then heated to obtain a liquid phase; S2, clarify the liquid phase, guide the clarified liquid phase into the mold cavity, hot bend it to form a rough blank; S3, the blank is annealed and then refined to obtain the 3D curved glass.

2. The fabrication process of 3D curved glass according to claim 1, characterized in that, In step S1, the ground mixture is passed through a 300-500 mesh sieve.

3. The fabrication process of 3D curved glass according to claim 1, characterized in that, In step S1, the heating temperature is 1000-1200℃, and the heating time is 1-4 hours.

4. The fabrication process of 3D curved glass according to claim 1, characterized in that, In step S2, the clarification is carried out using a clarifying agent. The mass ratio of the amount of clarifying agent added to the liquid phase is 1:(30-60). The clarifying agent includes a mixture of cerium oxide, calcium fluoride and sodium chloride. The mass ratio of cerium oxide, calcium fluoride and sodium chloride in the clarifying agent is 1:(1-2):(1-2).

5. The fabrication process of 3D curved glass according to claim 4, characterized in that, The preparation method of the clarifying agent is as follows: Cerium oxide, calcium fluoride, and sodium chloride are calcined at 800-1000℃ for 2-4 hours to obtain a clarifying agent.

6. The fabrication process of 3D curved glass according to claim 1, characterized in that, In step S2, the specific steps of hot bending forming are as follows: Under a pressure of 0.1-0.4 MPa, the liquid phase was kept at 800-900℃ for 1-2 hours to obtain a rough embryo.

7. The fabrication process of 3D curved glass according to claim 1, characterized in that, In step S3, the blank needs to be crystallized before annealing. The specific steps of the crystallization process are as follows: The blank is cooled to release thermal stress to room temperature at a rate of 1-3℃ / min. Then, the blank is heated to 400-600℃ at a rate of 2-5℃ / min and held for 2-4 hours to obtain a crystallized blank.

8. The fabrication process of 3D curved glass according to claim 1, characterized in that, In step S3, the specific steps of annealing are as follows: The blank is cooled to release thermal stress to room temperature at a rate of 1-3℃ / min.

9. A 3D curved glass obtained by a manufacturing process of 3D curved glass as described in any one of claims 1-8.

Images