High-toughness anti-fracture ion exchange glass as well as preparation method and application thereof

Abstract

The invention relates to the field of tempered glass, and particularly discloses high-toughness anti-fracture ion exchange glass as well as a preparation method and application thereof. The ion exchange glass is prepared from borosilicate base material glass with specific composition through chemical strengthening, and the core of the ion exchange glass is that the fracture bending and stretching resistance characteristic factor D is more than or equal to 0.68 and less than or equal to 1.44. The factor D is defined by a relational expression, ICS30 is compressive stress storage compression energy, and the ICS30 is larger than or equal to 68 and smaller than or equal to 132. Key parameters such as fracture toughness Kc, elastic modulus E, Vickers hardness H and pressure stress CS30 of base material glass are cooperatively controlled within a specific optimization interval, and the proportion of key components such as (SiO2 + B2O3) / Al2O3 in the base material glass composition is limited, so that the anti-falling height of the glass is successfully increased to 180 cm or above; the industrial problem that existing cover plate glass is insufficient in impact resistance under the light and thin trend is solved.

Description

Technical Field

[0001] This application relates to the field of tempered glass, and more specifically, to a high-strength, tough, and fracture-resistant ion-exchange glass, its preparation method, and its uses. Background Technology

[0002] Cover glass is a key component in mobile smart terminals (such as smartphones, tablets, and wearable devices), display panels for new energy vehicles, and special protective windows. Its mechanical properties directly affect the reliability and service life of these devices. In recent years, with the trend towards thinner and larger screens in electronic devices, the thickness of cover glass has been continuously decreasing while its size has been increasing, leading to a significant increase in the mechanical stress and impact risks it experiences during daily use. At the same time, the diversification of user scenarios (such as multi-angle drops, scratches from hard objects, repeated pressure, and extreme temperature differences) places more stringent demands on the impact resistance, damage resistance, and structural integrity of glass materials.

[0003] Currently, the industry commonly uses chemical strengthening (ion exchange) processes to improve the mechanical properties of glass. This process effectively inhibits the propagation of surface microcracks by forming a compressive stress layer on the glass surface, thereby improving the strength and impact resistance of the glass. However, traditional chemically strengthened glass has the following technical limitations: First, most existing technologies focus on optimizing a single parameter. For example, they may only pursue higher surface compressive stress values ​​or simply increase the depth of the compressive stress layer. This optimization strategy often results in limited performance improvement or even negative effects. For instance, excessively high surface compressive stress can reduce glass toughness, while excessively deep compressive stress layers can hinder thinner designs.

[0004] Secondly, there is a lack of effective synergistic optimization among the various performance parameters of conventional chemically strengthened glass. Intrinsic properties such as fracture toughness, elastic modulus, and hardness are mutually constrained by chemical strengthening parameters, and optimizing a single parameter alone is unlikely to achieve a breakthrough in overall performance.

[0005] Third, existing glass composition designs fail to fully consider the synergistic effects between components. Traditional glass compositions lack systematic control over the ratio of alkali metal oxides to reinforcing components, making it difficult to simultaneously meet multiple requirements such as high toughness and high ion exchange efficiency.

[0006] Fourth, there is a lack of evaluation indicators that can accurately characterize the overall fracture resistance of glass. Existing single indicators are insufficient to comprehensively reflect the damage resistance of glass throughout the entire process from deformation under stress to eventual fracture.

[0007] Due to the aforementioned limitations, the drop resistance of conventional chemically strengthened glass is currently only 1.1-1.2 meters, which cannot meet the growing demand for protective performance in high-end applications. Especially in the consumer electronics field, such as smartphones and wearable devices, users generally require drop resistance of over 1.5 meters, and some high-end applications even require drop resistance of 1.8-2.0 meters. Summary of the Invention

[0008] To address the aforementioned issues, this application provides a high-strength, tough, and fracture-resistant ion-exchange glass, its preparation method, and its applications.

[0009] The technical solution adopted in this application is as follows: In a first aspect, this application provides a high-strength, high-toughness, fracture-resistant ion-exchange glass, which is obtained from a substrate glass through a chemical strengthening process; the fracture resistance bending-elasticity characteristic factor D of the ion-exchange glass satisfies: 0.68 ≤ D ≤ 1.44; The fracture resistance bending and elongation characteristic factor D is defined by the following relationship (1): Equation (1) The high-strength, tough, and fracture-resistant ion exchange glass stores compressive energy I under compressive stress when the compressive stress layer depth is 30 μm. CS30 Satisfies: 68 ≤ I CS30 ≤ 132; The ICS30 is defined by the following relation (2): Equation (2) in, Kc is the fracture toughness of the substrate glass, satisfying 1.0 ≤ Kc ≤ 2.2; v is the Poisson's ratio of the substrate glass; E is the elastic modulus of the substrate glass, satisfying 82 GPa ≤ E ≤ 96 GPa; H is the Vickers hardness of the substrate glass, satisfying 600 ≤ H ≤ 720; t is the thickness of the high-strength, tough, and fracture-resistant ion exchange glass; Y is the bulk compressibility modulus of the high-strength, tough, and fracture-resistant ion exchange glass, which is a constant of 0.8. CS30 is the compressive stress of the high-strength, tough, and fracture-resistant ion exchange glass when the compressive stress layer depth is 30 μm, satisfying 110 MPa ≤ CS30 ≤ 220 MPa.

[0010] Furthermore, the drop resistance of the aforementioned ion-exchange glass is greater than or equal to 180 cm.

[0011] Furthermore, the thickness t of the aforementioned substrate glass satisfies: 0.5 mm ≤ t ≤ 2.0 mm.

[0012] Furthermore, the fracture resistance eigenvalue D of the above-mentioned ion-exchange glass satisfies: 0.75 ≤ D ≤ 0.95; compressive stress stores compressive energy I. CS30 Satisfy: 72 ≤ I CS30 ≤ 122.

[0013] Furthermore, in the above equations (1) and (2): The elastic modulus E of the substrate glass satisfies 84 GPa ≤ E ≤ 90 GPa; The fracture toughness Kc of the substrate glass satisfies 1.6 ≤ Kc ≤ 2.0; The Vickers hardness H of the substrate glass satisfies 665 ≤ H ≤ 690; The Poisson's ratio of the substrate glass satisfies 0.22 ≤ v ≤ 0.28; The compressive stress CS30 of the high-strength, tough, and fracture-resistant ion exchange glass meets the requirement of 150 MPa ≤ CS30 ≤ 190 MPa.

[0014] Secondly, this application provides a substrate glass for the aforementioned high-strength, tough, and fracture-resistant ion-exchange glass, which is a borosilicate glass. Based on oxides, the composition of the substrate glass, by mass percentage, includes: The mass percentage of SiO2 is 61.8 wt%-62.9 wt%. The mass percentage of Al2O3 is 18.2 wt% - 20.2 wt%. The mass percentage of Na2O is 7.0wt%-7.2wt%; The mass percentage of K2O is 1.0 wt%-1.7 wt%. The mass percentage of MgO is 2.1 wt% - 3.1 wt%. The mass percentage of Li2O is 4.3wt%-4.6wt%; The mass percentage of ZrO2 is 2.2wt%-3.4wt%. The mass percentage of B2O3 is 0.2wt%-1.6wt%.

[0015] Furthermore, the mass fractions of the components in the above-mentioned substrate glass satisfy at least one of the following conditions: (1) 1.98 ≤ (SiO2+ B2O3) / Al2O3 ≤ 3.52; (2) 4.21 ≤ (Li2O + Na2O + K2O) / ZrO2 ≤ 5.95; (3) 5.14 ≤ (ZrO2+ Al2O3) / (MgO + B2O3) ≤ 12.72.

[0016] Furthermore, the mass fractions of each component in the above-mentioned substrate glass simultaneously satisfy conditions (1), (2) and (3).

[0017] Thirdly, this application provides a method for preparing the above-mentioned high-strength, tough, and fracture-resistant ion-exchange glass, comprising: (1) Provide the above-mentioned substrate glass; (2) The substrate glass is chemically strengthened to obtain the high-strength, tough, and fracture-resistant ion exchange glass.

[0018] Fourthly, this application provides the use of the above-mentioned high-strength, tough, and fracture-resistant ion exchange glass in the preparation of mobile smart terminal cover plates, new energy vehicle display panels, or special protective windows.

[0019] In summary, this application has the following beneficial effects: 1. This application abandons the traditional approach of single-parameter optimization and, for the first time, constructs a comprehensive mathematical model centered on the "fracture resistance bending-elasticity characteristic factor D". This model synergistically couples the intrinsic properties and structural parameters of the substrate glass with the results of chemical strengthening processes, accurately quantifying the glass's damage resistance throughout the entire process from stress to fracture. By synergistically controlling factor D and related parameters within a specific optimization window (e.g., 0.68 ≤ D ≤ 1.44), the drop resistance height of the glass is systematically increased from the conventional 1.1-1.2 meters to over 1.8 meters, solving the reliability bottleneck of high-end equipment in complex usage scenarios.

[0020] 2. Through extensive experiments, the inventors clarified the optimal range of each key parameter and their synergistic effects. This not only defined the overall target of factor D but also specified the specific optimization ranges for each sub-parameter (such as elastic modulus, fracture toughness, and compressive stress) to achieve this target. This transforms the previously experience-based performance optimization process into a quantifiable, calculable, and controllable technical solution. This provides a clear theoretical basis for precisely controlling product quality and achieving performance targets during production, significantly improving product consistency and yield.

[0021] 3. To address the material sourcing issue for achieving the aforementioned parameter range, a specific borosilicate glass composition was designed. By limiting the mass fraction and proportion of key oxides (such as SiO2, Al2O3, Li2O, ZrO2, etc.), the glass network structure, ion exchange efficiency, and mechanical reinforcement effect were balanced from the source. This composition ensures that the substrate glass simultaneously possesses high fracture toughness, high elastic modulus, suitable Poisson's ratio, and excellent ion exchange activity, providing a reliable and industrially feasible material guarantee for obtaining a final product with high "compressive stress stored compression energy (ICS30)" and high CS30 through chemical strengthening and stabilization.

[0022] 4. This application, through the overall solution of the aforementioned model, parameter window, and component design, systematically coordinates the multiple performance relationships of glass, including strength, toughness, hardening, and stress, avoiding the common problem of improving a single performance leading to the deterioration of other properties. The final product maintains high strength, toughness, and hardness while also possessing excellent impact resistance, scratch resistance, and structural integrity, perfectly meeting the extreme composite requirements of "thin, light, strong, and tough" for cover glass in applications such as mobile smart terminals and new energy vehicle display panels. Detailed Implementation

[0023] The embodiments of the present invention will be described in detail below with reference to the examples. However, those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be regarded as limiting the scope of the present invention. Specific conditions not specified in the examples shall be carried out according to conventional conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0024] The technical solution of this invention is as follows: The core of this application lies in a high-strength, high-toughness, fracture-resistant ion-exchange glass, which is obtained by chemical strengthening of a substrate glass; the fracture resistance bending-elongation characteristic factor D of the ion-exchange glass satisfies: 0.68 ≤ D ≤ 1.44; The fracture resistance bending-extension characteristic factor D is defined by the following relationship (1): Equation (1) This high-strength, fracture-resistant ion exchange glass stores compressive energy I under compressive stress at a compressive stress layer depth of 30 μm. CS30 Satisfies: 68 ≤ I CS30 ≤ 132; ICS30 is defined by the following relation (2): Equation (2) in: Fracture toughness (Kc) of the substrate glass: As an intrinsic material property, fracture toughness directly reflects the glass's ability to resist crack initiation and propagation—the higher the fracture toughness, the less likely the glass is to shatter due to the propagation of micro-cracks when subjected to impact, which is the "basic guarantee" of drop resistance. The fracture toughness Kc of the substrate glass satisfies 1.0 ≤ Kc ≤ 2.2; preferably, Kc satisfies 1.6 ≤ Kc ≤ 2.0.

[0025] The Poisson's ratio (v) of the substrate glass describes the proportion of lateral deformation of the glass under longitudinal force, and is directly related to the stress distribution of the glass under impact load. For example, substrate glass with a smaller Poisson's ratio exhibits weaker lateral shrinkage deformation upon drop, reducing stress concentration and lowering the risk of edge breakage. Preferably, the Poisson's ratio of the substrate glass satisfies 0.22 ≤ v ≤ 0.28.

[0026] The elastic modulus (E) of the substrate glass characterizes the glass's ability to resist elastic deformation and determines its efficiency in absorbing and transferring energy during impact. An excessively high elastic modulus can lead to excessive rigidity and insufficient toughness, while a too low modulus can easily cause structural failure due to excessive deformation. Therefore, it needs to be matched in conjunction with other parameters. The elastic modulus E of the substrate glass satisfies 82 ≤ E ≤ 96 GPa; preferably, E satisfies 84 GPa ≤ E ≤ 90 GPa.

[0027] The thickness (T) of the substrate glass: As a key structural parameter of glass, thickness directly affects the stiffness and bending strength of the glass—the greater the thickness, the less likely the glass is to bend or break when subjected to impact, serving as the "structural support" for drop resistance. Currently, the thickness T of substrate glass suitable for smart communication devices is generally: 0.5≤T≤2.0mm.

[0028] As a core characterization parameter of the chemical strengthening process of substrate glass, the CS30 stress value specifically refers to the compressive stress at a depth of 30 μm below the surface of the glass after chemical strengthening treatment. It directly reflects the glass surface's ability to actively inhibit crack propagation—the higher the CS30 stress value, the more effectively the compressive stress in the 30 μm depth region of the surface can counteract external forces when the glass is subjected to external tensile stress, impact, or bending loads, "clamping" existing micro-cracks on the surface and preventing them from initiating and extending into the glass interior, thereby significantly improving fracture resistance. The CS30 stress value of the substrate glass should satisfy: 110 MPa ≤ CS30 ≤ 220 MPa, which is the "core support" for the fracture resistance of chemically strengthened glass. Preferably, CS30 satisfies 150 MPa ≤ CS30 ≤ 190 MPa.

[0029] Vickers hardness (H) of the substrate glass: As an intrinsic material property, Vickers hardness directly reflects the glass's ability to resist localized indentation and plastic deformation. The higher the Vickers hardness, the less likely the glass is to develop scratches or indentations due to surface deformation when subjected to localized pressure or friction; it is the "core support" for surface damage resistance. The Vickers hardness H of the substrate glass should satisfy 600 ≤ H ≤ 720; preferably, H should satisfy 665 ≤ H ≤ 690.

[0030] I of the substrate glass CS30 : This refers to the compressive stress storage compressive energy of high-strength, toughness, and fracture-resistant ion exchange glass when the compressive stress layer depth is 30 μm. As a key performance indicator of high-strength, toughness, and fracture-resistant ion exchange glass, I... CS30 I directly reflects the compressive energy stored in the compressive stress layer on the glass surface at a depth of 30 μm. CS30 The higher the I value, the more effectively the glass can absorb and disperse energy through the compressive stress layer when subjected to impact, inhibiting the initiation and propagation of cracks, thus significantly improving its fracture resistance and drop resistance, serving as an "enhanced guarantee" for drop resistance. The I value of the substrate glass... CS30 Typically, 68 ≤ I is satisfied. CS30 ≤132; preferably, I CS30 Satisfy: 72 ≤ I CS30 ≤ 122.

[0031] The inventors of this application collected measured data on the above-mentioned parameters through a large number of comparative experiments (covering different substrate formulations and combinations of strengthening process parameters), and combined the results of drop performance tests (such as drop resistance height and breakage probability). Using methods such as multiple regression analysis and finite element simulation, they constructed a mathematical model of the "fracture resistance yield-extension factor". This characteristic value is not a direct reflection of a single parameter, but rather the result of the synergistic coupling of several parameters, which can accurately map the damage resistance of glass from "stress deformation" to "crack propagation" and then to "final fracture".

[0032] In actual production, by controlling the fracture elongation characteristic factor within a specific optimized range (dynamically adjusted according to application scenario requirements, such as consumer electronics needing to balance thinness and high drop resistance, and automotive glass needing to focus on impact stability), a controllable improvement in drop resistance can be achieved. Actual testing has verified that chemically strengthened glass using this technology can generally achieve a drop resistance height of over 1.8m (compared to 1.1-1.2m for conventional strengthened glass). After optimizing the raw material formula and strengthening process, the drop resistance height can be consistently maintained above 1.8m. In customized solutions for high-end flagship products, the drop resistance height of some chemically strengthened glass can even exceed 2.1m.

[0033] To address the issue of material sourcing for achieving the aforementioned parameter range, this application specifically designs a particular borosilicate glass composition. Based on oxides, the composition of the substrate glass, expressed as a percentage by mass, includes: The mass percentage of SiO2 is 61.8 wt%-62.9 wt%. The mass percentage of Al2O3 is 18.2 wt% - 20.2 wt%. The mass percentage of Na2O is 7.0wt%-7.2wt%; The mass percentage of K2O is 1.0 wt%-1.7 wt%. The mass percentage of MgO is 2.1 wt% - 3.1 wt%. The mass percentage of Li2O is 4.3wt%-4.6wt%; The mass percentage of ZrO2 is 2.2wt%-3.4wt%. The mass percentage of B2O3 is 0.2wt%-1.6wt%.

[0034] in: SiO2 is a component that forms the network of glass. If the SiO2 content is too low, vitrification is difficult, the coefficient of thermal expansion is prone to becoming too high, and the thermal shock resistance is reduced. In addition, the resistance to hydrofluoric acid may also decrease.

[0035] Al2O3 is a component that improves ion exchange performance. In addition, it is a component that improves strain point, Young's modulus, fracture toughness, and Vickers hardness.

[0036] B₂O₃ is a component that reduces viscosity and density at high temperatures, stabilizes glass, makes it difficult for crystals to precipitate, and lowers the liquidus temperature. It also increases the binding force of cations on oxygen electrons, thus reducing the basicity of the glass. If the B₂O₃ content is too low, the stress depth in the ion exchange between Li ions in the glass and Na ions in the molten salt becomes excessively deep.

[0037] Li₂O is an ion-exchange component, particularly effective in exchanging Li ions in glass with Na ions in molten salt, making it efficient for achieving deep stress depth. Additionally, Li₂O reduces high-temperature viscosity, improves melt flow and formability, and increases the elastic modulus.

[0038] Na₂O is an ion-exchange component; it also reduces viscosity at high temperatures, improving melt permeability and formability. K₂O also reduces viscosity at high temperatures, improving melt permeability and formability. Furthermore, it increases the depth of stress. MgO is a component that reduces high-temperature viscosity, improves meltability and formability, and increases strain point, Vickers hardness, Young's modulus and fracture toughness. Among alkaline earth metal oxides, it is the component with the greatest effect on improving ion exchange performance.

[0039] Furthermore, the mass fractions of the components in the above-mentioned substrate glass satisfy at least one of the following conditions: (1)1.98 ≤ (SiO2+ B2O3) / Al2O3≤ 3.52; This ratio is crucial for controlling the stability of the glass network structure. SiO2 and B2O3, as network forgings, constitute the inorganic framework of the glass, while Al2O3, as a network intermediate, significantly enhances network connectivity and stability. Controlling this ratio within the aforementioned range aims to achieve a delicate balance: if the ratio is too low, it means the Al2O3 content is relatively high, potentially leading to an overly dense, rigid, and brittle glass network; if the ratio is too high, the network forgings are relatively insufficient, resulting in an overly loose glass network structure and decreased mechanical strength and chemical stability. Therefore, this ratio reflects the basic structural stability of the glass network and must be controlled within a reasonable range to avoid an overly loose or brittle network.

[0040] (2) 4.21 ≤ (Li2O + Na2O + K2O) / ZrO2 ≤ 5.95; This ratio is crucial for achieving both efficient ion exchange and high toughness strengthening. The alkali metal oxides (Li₂O, Na₂O, K₂O) in the molecule are the active components participating in ion exchange, and their total amount directly determines the efficiency of chemical strengthening and the establishment of surface compressive stress. Meanwhile, ZrO₂ in the denominator is a highly effective toughness enhancer, significantly improving the fracture toughness of the glass through mechanisms such as phase transformation toughening. If this ratio is too low, it indicates that the ZrO₂ content is relatively high. While it can improve toughness, it will excessively hinder the migration of alkali metal ions, resulting in insufficient ion exchange depth and a shallow compressive stress layer. If the ratio is too high, it means that the ion exchange rate is too fast but the toughness enhancement is insufficient; the glass may have high surface hardness but is prone to fracture due to crack propagation. Therefore, controlling this ratio is essential to balancing ion exchange efficiency and glass toughness, avoiding insufficient strengthening or hindered ion exchange.

[0041] (3) 5.14 ≤ (ZrO2+ Al2O3) / (MgO + B2O3) ≤ 12.72.

[0042] This ratio aims to resolve the contradiction between the requirements of high strength and high toughness and good processing performance. The molecule (ZrO2 + Al2O3) is the core reinforcing phase, and the synergistic effect of the two can significantly improve the elastic modulus, Vickers hardness, and fracture toughness of the glass. The denominator (MgO + B2O3) mainly plays the role of regulating processing performance. MgO, as an alkaline earth metal oxide, can improve high-temperature viscosity and crystallization performance, while B2O3, as a flux, can effectively reduce the melting temperature and improve the glass formability. If the ratio is too low, it indicates that there is too much flux component, which is beneficial for melting and forming, but will dilute the concentration of the reinforcing phase, resulting in insufficient intrinsic strength and toughness of the glass. If the ratio is too high, the concentration of the reinforcing phase is too high, which may lead to increased high-temperature viscosity, difficulty in melting, poor homogeneity, and even easy crystallization, making production impossible. Therefore, this ratio ensures a balance between "strength and formability," guaranteeing that the glass has good meltability and processability.

[0043] Simultaneously satisfying these three component ratio conditions signifies a highly synergistic and systematic optimization across the fundamental structure of the glass network, chemical strengthening kinetics, and final macroscopic mechanical properties. It is not simply a superposition of three independent effects, but rather the construction of a precise balance: condition (1) ensures the glass possesses a strong and stable network framework, laying the foundation for high strength; condition (2) precisely balances ion exchange efficiency and toughness enhancement, enabling the material to possess both deep strengthening and high crack propagation resistance; condition (3) coordinates the high strength requirement with the feasibility of industrial production, ensuring the realization of excellent performance. The synergistic effect of these three factors elevates glass component design from empirical exploration to a predictable and controllable system engineering approach, which is the indispensable core of materials science enabling the glass of this invention to achieve drop resistance of over 1.8 meters, a feat unattainable by conventional products.

[0044] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention. Example

[0045] This set of embodiments provides a high-strength, tough, and fracture-resistant ion-exchange glass, the preparation method of which includes: (1) Prepare materials according to the material specifications in Table 1; (2) The molten mixed substrate glass composition is clarified, homogenized, shaped and annealed to obtain a high-strength and tough fracture-resistant substrate glass with a thickness of 0.7T; (3) The substrate glass is chemically strengthened twice: the first chemical strengthening salt bath is 100% NaNO3, and the strengthening conditions are 440℃, 70min; the second chemical strengthening salt bath is a mixed salt of 98% KNO3 and 2% NaNO3, and the strengthening conditions are 420℃, 80min.

[0046] Table 1. serial number <![CDATA[SiO2]]> <![CDATA[Al2O3]]> <![CDATA[Na2O]]> <![CDATA[K2O]]> MgO <![CDATA[ZrO2]]> <![CDATA[B2O3]]> <![CDATA[Li2O]]> Condition 1 Condition 2 Condition 3 Example 1 61.8 20.2 7.0 1.0 2.5 2.6 0.6 4.3 3.1 4.7 7.4 Example 2 62.9 19.7 7.1 1.2 2.1 2.2 0.3 4.5 3.2 5.8 9.1 Example 3 62.1 19.3 7.2 1.1 2.5 2.6 0.8 4.4 3.3 4.9 6.6 Example 4 61.9 18.2 7.1 1.7 3.1 3.4 0.2 4.4 3.4 3.9 6.5 Example 5 61.8 18.3 7.0 1.4 2.5 2.8 1.6 4.6 3.5 4.6 5.1 Example 6 62.0 19.2 7.2 1.6 2.8 2.3 0.5 4.4 3.3 5.7 6.5 Example 7 62.2 19.8 7.1 1.2 2.4 2.4 0.6 4.3 3.2 5.3 7.4 Example 8 61.9 20.0 7.0 1.0 2.2 2.3 1.1 4.5 3.2 5.4 6.8 Example 9 62.4 18.9 7.2 1.3 3.0 2.3 0.4 4.5 3.3 5.7 6.2 Example 10 62.1 19.6 7.0 1.2 2.8 2.5 0.4 4.4 3.2 5.0 6.9 Comparative Example 1 58.6 15.2 3.6 8.8 8.2 1.1 2.4 2.1 4.0 13.2 1.5 Comparative Example 2 56.6 14.6 8.5 4.2 4.6 1.8 2.6 7.1 4.1 11.0 2.3 Comparative Example 3 64.1 16.2 8.6 0.8 1.8 1.6 4.2 2.7 4.2 7.6 3.0 Comparative Example 4 59.8 17.2 2.8 2.5 4.6 3.6 4.6 4.9 3.7 2.8 2.3 Comparative Example 5 59.4 16.9 9.5 2.2 4.6 2.0 1.8 3.6 3.6 7.7 3.0 Note: In the table, condition 1 is (SiO2+ B2O3) / Al2O3; condition 2 is (Li2O + Na2O + K2O) / ZrO2; and condition 3 is (ZrO2+ Al2O3) / (MgO + B2O3).

[0047] Performance testing I. Experimental Methods

[0048] (1) The CS30 stress of the glass was tested using the Origen SLP-2000 stress tester. Ten samples were tested.

[0049] (2) The Vickers hardness H was measured using an automatic micro Vickers hardness tester HVS-1000AT2.1 in accordance with GB / T 37900-2019; (3) The elastic modulus E and Poisson's ratio v of the substrate glass were tested using a pulse echo spectrometer.

[0050] (4) Fracture toughness K C The test was conducted according to GB / T 37900-2019 "Test Methods for Hardness and Fracture Toughness of Ultrathin Glass - Small Load Vickers Hardness Indentation Method". The main instruments and equipment were: DZ-5HXD-2000TMC / LCD automatic turret with image analysis and digital display microhardness tester. (5) A drop test was conducted using a drop tester of model XH-YF1000. The test conditions were: 180 grit sandpaper, a total weight of 186 grams for the glass sample and fixture, a base height of 50 cm, a drop height of 5 cm each time, repeated once at each height until the glass broke, and 20 pieces of glass were tested.

[0051] II. Test Results

[0052] As shown in Table 2: Table 2. serial number Elastic modulus (GMP) <![CDATA[Fracture toughness (MPa•m 1 / 2 )]]> Vickers hardness (MPa) Poisson's ratio CS30 (MPa) <![CDATA[I CS30 ]]> D Drop resistance height Example 1 86 1.8 678 0.23 152 72 0.879 195 Example 2 88 1.6 668 0.24 168 85 0.815 180 Example 3 84 1.9 686 0.28 172 89 0.915 200 Example 4 87 1.8 672 0.22 186 109 0.829 185 Example 5 86 1.6 667 0.26 191 110 0.798 180 Example 6 89 1.7 670 0.25 158 74 0.875 185 Example 7 90 1.8 675 0.25 182 97 0.876 185 Example 8 88 1.7 667 0.24 176 94 0.836 180 Example 9 89 1.9 671 0.23 182 100 0.883 190 Example 10 86 2.0 681 0.22 196 122 0.864 190 Comparative Example 1 75 0.8 564 0.32 101 32 0.651 145 Comparative Example 2 72 0.7 524 0.34 110 39 0.606 140 Comparative Example 3 76 0.8 571 0.38 123 43 0.673 150 Comparative Example 4 71 0.6 621 0.36 109 37 0.528 135 Comparative Example 5 73 0.7 585 0.33 118 45 0.568 140 As can be seen from Tables 1 and 2: Compared to Comparative Examples 1-5, Examples 1-10 of this application, through systematic component and performance control, successfully improved the drop resistance of the cover glass from the 135-150cm level of the comparative examples to over 180cm, with some products even reaching 200cm, fully meeting the extreme reliability requirements of high-end equipment.

[0053] The data in Table 2 strongly demonstrate that the fracture resistance bending-elasticity characteristic factor D is a comprehensive indicator that can accurately and reliably predict and characterize the final fracture resistance of glass. The D value can fall within the target range and directly correspond to excellent drop resistance only when all key parameters are controlled within the ideal range through coordinated composition and process control.

[0054] The performance failures of Comparative Examples 1-5 clearly demonstrate that, without adhering to the three proportional conditions (conditions 1-3) specified in this application, it is impossible to prepare a product that simultaneously possesses high fracture toughness, high elastic modulus, high surface compressive stress, and high compressive energy. These three conditions are indispensable cornerstones for achieving the synergistic effect of various high performance characteristics, ultimately resulting in a high D-factor and ultra-high drop resistance.

[0055] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-strength, tough, and fracture-resistant ion-exchange glass, characterized in that, It is obtained by chemical strengthening of substrate glass; the fracture elongation characteristic factor D of the ion-exchange glass satisfies: 0.68 ≤ D ≤ 1.44; The fracture resistance bending and elongation characteristic factor D is defined by the following relationship (1): Equation (1) The high-strength, tough, and fracture-resistant ion exchange glass stores compressive energy I under compressive stress when the compressive stress layer depth is 30 μm. CS30 Satisfies: 68 ≤ I CS30 ≤ 132; The ICS30 is defined by the following relation (2): Equation (2) in, Kc is the fracture toughness of the substrate glass, satisfying 1.0 ≤ Kc ≤ 2.2; v is the Poisson's ratio of the substrate glass; E is the elastic modulus of the substrate glass, satisfying 82 GPa ≤ E ≤ 96 GPa; H is the Vickers hardness of the substrate glass, satisfying 600 ≤ H ≤ 720; t is the thickness of the high-strength, tough, and fracture-resistant ion exchange glass; Y is the bulk compressibility modulus of the high-strength, tough, and fracture-resistant ion exchange glass, which is a constant of 0.

8. CS30 is the compressive stress of the high-strength, tough, and fracture-resistant ion exchange glass when the compressive stress layer depth is 30 μm, satisfying 110 MPa ≤ CS30 ≤ 220 MPa.

2. The high-strength, tough, fracture-resistant ion exchange glass according to claim 1, characterized in that, The drop resistance of the ion exchange glass is greater than or equal to 180 cm.

3. The high-strength, tough, fracture-resistant ion exchange glass according to claim 1, characterized in that, The thickness t of the substrate glass satisfies: 0.5 mm ≤ t ≤ 2.0 mm.

4. The high-strength, tough, fracture-resistant ion exchange glass according to claim 1, characterized in that, The fracture resistance yield-stretch characteristic factor D of the ion-exchange glass satisfies: 0.75 ≤ D ≤ 0.95; the compressive stress storage compressive energy I of the substrate glass CS30 Satisfy: 72 ≤ I CS30 ≤ 122.

5. The high-strength, tough, fracture-resistant ion exchange glass according to claim 4, characterized in that, In equations (1) and (2): The elastic modulus E of the substrate glass satisfies 84 GPa ≤ E ≤ 90 GPa; The fracture toughness Kc of the substrate glass satisfies 1.6 ≤ Kc ≤ 2.0; The Vickers hardness H of the substrate glass satisfies 665 ≤ H ≤ 690; The Poisson's ratio of the substrate glass satisfies 0.22 ≤ v ≤ 0.28; The compressive stress CS30 of the high-strength, tough, and fracture-resistant ion exchange glass satisfies 150 MPa ≤ CS30 ≤ 190 MPa.

6. A substrate glass for manufacturing high-strength, tough, fracture-resistant ion-exchange glass as described in any one of claims 1-5, characterized in that, It is a borosilicate glass, and based on oxides, the composition of the substrate glass, expressed as a percentage by mass, includes: The mass percentage of SiO2 is 61.8 wt%-62.9 wt%. The mass percentage of Al2O3 is 18.2 wt% - 20.2 wt%. The mass percentage of Na2O is 7.0wt%-7.2wt%; The mass percentage of K2O is 1.0 wt%-1.7 wt%. The mass percentage of MgO is 2.1 wt% - 3.1 wt%. The mass percentage of Li2O is 4.3wt%-4.6wt%; The mass percentage of ZrO2 is 2.2wt%-3.4wt%. The mass percentage of B2O3 is 0.2wt%-1.6wt%.

7. The substrate glass of the high-strength, tough, fracture-resistant ion exchange glass according to claim 6, characterized in that, The mass fraction of each component in the composition of the substrate glass satisfies at least one of the following conditions: (1) 1.98 ≤ (SiO2+ B2O3) / Al2O3 ≤ 3.52; (2) 4.21 ≤ (Li2O + Na2O + K2O) / ZrO2 ≤ 5.95; (3) 5.14 ≤ (ZrO2+ Al2O3) / (MgO + B2O3) ≤ 12.

72.

8. The substrate glass of the high-strength, tough, fracture-resistant ion exchange glass according to claim 7, characterized in that, The mass fractions of each component in the composition of the substrate glass simultaneously satisfy conditions (1), (2) and (3).

9. A method for preparing high-strength, tough, and fracture-resistant ion-exchange glass as described in any one of claims 1-5, characterized in that, It includes: Provide a substrate glass as described in any one of claims 6-8; The substrate glass is chemically strengthened to obtain the high-strength, tough, and fracture-resistant ion-exchange glass.

10. The use of a high-strength, tough, fracture-resistant ion-exchange glass as described in any one of claims 1-5 in the preparation of cover plates for mobile smart terminals, display panels for new energy vehicles, or special protective windows.

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