Glass and preparation method therefor, glass assembly, and vehicle

Abstract

The present application provides a glass and a preparation method therefor, a glass assembly, and a vehicle. The glass satisfies: (CS0+CS1)*DOL1+(CS1+CS2)*(DOL2-DOL1)+CS2*(DOL3-DOL2)≤24*t, CS0≥600 MPa, and DOL1+DOL2+DOL3≥0.25t. CS0 represents the surface compressive stress of the glass; CS1 represents the knee point stress of the glass in a first ion exchange process and a second ion exchange process; DOL1 represents the knee point depth of the glass in the first ion exchange process and the second ion exchange process; CS2 represents the knee point stress of the glass in a thermal strengthening process and the first ion exchange process; DOL2 represents the knee point depth of the glass in the thermal strengthening process and the first ion exchange process; DOL3 represents the stress depth of the glass in the thermal strengthening process; and t represents the thickness of the glass. Therefore, the anti-splintering strength of the glass is improved.

Description

Glass and its preparation method, glass component, vehicle

[0001] This disclosure claims priority to the Chinese patent application filed with the Patent Office of China on February 27, 2024, with application number 202410211910.8 and application name “Glass and its preparation method, glass assembly, vehicle”, the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0002] The present application belongs to the field of glass technology, and specifically relates to glass and its preparation method, glass components, and vehicles. Background Art

[0003] In the field of glass technology, chemically tempered thin glass offers the same resistance to bending and cracking as typical chemically strengthened glass, while maintaining a relatively thin thickness. However, when impacted by hard, sharp objects, the surface of chemically tempered thin glass is susceptible to crack propagation, resulting in lower needle drop resistance on the surface of chemically tempered laminated glass. Summary of the Invention

[0004] In view of this, a first aspect of the present application provides a glass, comprising a first zone, a second zone, and a third zone, wherein the second zone is located within the first zone, and the third zone is located within the second zone, wherein the first zone, the second zone, and the third zone all extend from an outer surface of the glass toward a center of the glass, and wherein the glass satisfies the following conditions: (CS0+CS1)*DOL1+(CS1+CS2)*(DOL2-DOL1)+CS2*(DOL3-DOL2)≤24*t, and CS0≥600MPa, and DOL1+DOL2+DOL3≥0.25t;

[0005] Wherein, CS0 represents the surface compressive stress of the glass, CS1 represents the inflection point stress of the glass in the first ion exchange process and the second ion exchange process, DOL1 represents the inflection point depth of the glass in the first ion exchange process and the second ion exchange process, CS2 represents the inflection point stress of the glass in the thermal strengthening process and the first ion exchange process, DOL2 represents the inflection point depth of the glass in the thermal strengthening process and the first ion exchange process, DOL3 represents the stress depth of the glass in the thermal strengthening process, and t represents the thickness of the glass.

[0006] The glass provided in the first aspect of the present application defines the relationship between CS0, CS1, DOL1, CS2, DOL2, DOL3, and t through the above formula, so that the first zone, second zone, and third zone of the glass can cooperate with each other to improve the glass's anti-shattering strength, so that after the glass is subjected to an impact, the cracks will not expand and cannot enter the center of the glass.

[0007] In related art, when glass is subjected to the impact of a general heavy scratch, a sharp object extrusion, or an impact defect, the impact or impact crack must pass through the outer surface of the glass and enter the center of the glass, causing the glass to shatter. However, in the present application, when the glass is subjected to the impact of a general heavy scratch, a sharp object extrusion, or an impact defect, the impact or impact crack must pass through the third zone, the portion of the second zone excluding the third zone, and the portion of the first zone excluding the second zone before entering the center of the glass. In other words, when the glass is subjected to the impact of a general heavy scratch, a sharp object extrusion, or an impact defect, the impact or impact crack must pass through the third zone, the second zone, and the first zone before entering the center of the glass.

[0008] Specifically, the above formula defines the relationship among CS0, CS1, DOL1, CS2, DOL2, DOL3, and t, thereby defining the compressive stress in the third zone, the compressive stress in the second zone excluding the third zone, and the compressive stress in the first zone excluding the second zone. Combined with the thickness of the third zone, the thickness of the second zone excluding the third zone, and the thickness of the first zone excluding the second zone, it is difficult for impacts or impact cracks to break through the third zone, the second zone, and the first zone, and to enter the center of the glass, thereby improving the glass's anti-shattering strength.

[0009] (CS0+CS1)*DOL1+(CS1+CS2)*(DOL2-DOL1)+CS2*(DOL3-DOL2)≤24*t is mainly used to limit the compressive stress in the first zone, the second zone, and the third zone, thereby improving the glass's anti-shattering strength, while reducing the tensile stress value in the central zone, thereby improving the surface needle drop performance of the glass. CS0≥600MPa is mainly used to maintain the glass's ability to resist bending and cracking at the general chemical strengthening level. DOL1+DOL2+DOL3≥0.25t is mainly used to make the glass have a total stress layer depth as high as possible at a thinner thickness to resist sharp objects from penetrating the tensile stress layer. The above three limiting formulas cooperate with each other to jointly limit the compressive stress of each zone of the glass, the thickness of each zone, and the thickness of the glass.

[0010] Therefore, the present application can define the relationship between CS0, CS1, DOL1, CS2, DOL2, DOL3, and t through a formula while maintaining the glass's ability to resist bending and cracking at a general chemical strengthening level and having a relatively thin thickness, so that the first zone, second zone, and third zone of the glass can cooperate with each other, thereby improving the glass's resistance to general heavy scratches, sharp object squeezing, and impact defects, thereby improving the surface needle drop performance of the glass.

[0011] Among them, in the glass, CS0, CS1, and DOL1 meet the following conditions: 600MPa≤CS0≤900MPa, 200MPa≤CS1≤300MPa, 0.005mm≤DOL1≤0.015mm.

[0012] Among them, in the glass, CS2 and DOL2 meet the following conditions: 5MPa≤CS2≤15MPa, 0.035mm≤DOL2≤0.055mm.

[0013] Wherein, in the glass, DOL3 and t satisfy the following conditions: DOL3≥0.25t, 0.7mm≤t≤1.2mm.

[0014] The glass further satisfies the following condition: (CS0-CS1) / DOL1≥2.5*(CS1-CS2) / (DOL2-DOL1).

[0015] Wherein, the central tensile stress CT of the glass satisfies the following condition: CT≤30MPa.

[0016] The first zone is formed by a thermal strengthening process, the second zone is formed by a first ion exchange process, and the third zone is formed by a second ion exchange process.

[0017] A second aspect of the present application provides a method for preparing glass, the method comprising:

[0018] Provide glass to be processed;

[0019] Performing a thermal strengthening process on the glass to be treated to obtain a first strengthened glass;

[0020] performing a first ion exchange process on the first strengthened glass to obtain a second strengthened glass;

[0021] The second strengthened glass is subjected to a second ion exchange process to obtain the glass provided in the first aspect of the present application.

[0022] The method for preparing the glass of the second aspect of the present application, by preparing the glass provided by the first aspect of the present application, can define the relationship between CS0, CS1, DOL1, CS2, DOL2, DOL3, and t through a formula while maintaining the glass's ability to resist bending and fracture at a general chemical strengthening level and having a relatively thin thickness, so that the first zone, second zone, and third zone of the glass can cooperate with each other, thereby improving the glass's resistance to general heavy scratches, sharp object extrusion, and impact defects, thereby improving the surface needle drop performance of the glass.

[0023] Wherein, the step of performing a thermal strengthening process on the glass to be processed includes:

[0024] The surface compressive stress σ1 of the glass to be treated satisfies the following conditions: 5MPa≤σ1≤15MPa, and in the glass to be treated, the value ranges of DOL3 and t satisfy: DOL3≥0.25t, 0.7mm≤t≤1.2mm, thereby obtaining the first strengthened glass.

[0025] During the heat strengthening process, the glass to be treated is heated at a temperature of T1, and the heated glass to be treated is cooled at a wind pressure of P; T1 and P satisfy the following conditions: 550°C≤T1≤750°C, 50mmWC≤P≤220mmWC.

[0026] The step of performing a first ion exchange process on the first tempered glass includes:

[0027] The second strengthened glass is obtained by making the surface compressive stress σ2 of the first strengthened glass satisfy the following conditions: 300 MPa≤σ2≤500 MPa, and in the first strengthened glass, CS2 and DOL2 satisfy the following conditions: 5 MPa≤CS2≤15 MPa, 0.035 mm≤DOL2≤0.055 mm.

[0028] During the first ion exchange process, the first strengthened glass satisfies one of the following conditions:

[0029] A mixed salt bath of potassium nitrate and sodium nitrate is used; wherein the mass ratio of potassium nitrate to sodium nitrate is (80-95):(5-20), the temperature of the first ion exchange process is T2, and the time is C1, and T2 and C1 meet the following conditions: 380°C≤T2≤450°C, 60min≤C1≤150min;

[0030] A potassium nitrate salt bath is used; wherein the proportion of potassium nitrate in the salt is not less than 95%, the first ion exchange process includes a daughter ion exchange process and a daughter ion migration process, the temperature of the daughter ion exchange process is T3, the time is C2, T3 and C2 meet the following conditions: 380°C ≤ T3 ≤ 450°C, 50min ≤ C2 ≤ 100min; the daughter ion migration process is not immersed in the potassium nitrate salt bath, but is completed in air, the migration temperature is T4, the migration time is C3, T4 and C3 meet the following conditions: 450°C ≤ T4 ≤ 500°C, 10min ≤ C3 ≤ 60min;

[0031] An ion exchange barrier layer is formed on the first tempered glass using a potassium nitrate salt bath, wherein the potassium nitrate accounts for no less than 95% of the salt. The first ion exchange process is performed at a temperature of T5 and a time of C4, wherein T5 and C4 satisfy the following conditions: 380°C ≤ T5 ≤ 450°C, and 90 min ≤ C4 ≤ 180 min.

[0032] The step of performing a second ion exchange process on the second strengthened glass includes:

[0033] The surface compressive stress σ3 of the second tempered glass satisfies the following conditions: 600 MPa≤σ3≤900 MPa, and in the second tempered glass, CS1 and DOL1 satisfy the following conditions: 200 MPa≤CS1≤300 MPa, 0.005 mm≤DOL1≤0.015 mm, thereby obtaining the glass.

[0034] During the second ion exchange process, a potassium nitrate salt bath is used; wherein, the proportion of potassium nitrate in the salt is not less than 95%, the temperature of the second ion exchange process is T6, and the time is C5, and T6 and C5 meet the following conditions: 400°C≤T6≤450°C, 120s≤C5≤600s.

[0035] A third aspect of the present application provides a glass assembly, which includes an intermediate layer, a first glass and a second glass. The first glass is the glass provided in the first aspect of the present application, and the first glass and the second glass are respectively arranged on opposite sides of the intermediate layer.

[0036] The glass assembly provided in the third aspect of the present application, by adopting the glass provided in the first aspect of the present application, can maintain the first glass's ability to resist bending and fracture at a general chemical strengthening level and the first glass has a relatively thin thickness, and define the relationship between CS0, CS1, DOL1, CS2, DOL2, DOL3, and t through a formula, so that the first area, second area, and third area of ​​the first glass can cooperate with each other, thereby improving the first glass's resistance to general heavy scratches, sharp object squeezing, and impact defects, and thereby improving the surface needle drop performance of the first glass.

[0037] Among them, when a needle with a diameter of 4.6 mm, a length of 25 mm, a total mass of 3.2 g, and a diamond tip angle of 120° is dropped onto the surface of the first glass facing away from the intermediate layer, the needle drop height H1 of the surface of the first glass facing away from the intermediate layer meets the following conditions: H1 ≥ 200 mm.

[0038] Among them, when a needle with a diameter of 4.6 mm, a length of 25 mm, a total mass of 3.2 g, and a diamond tip angle of 120° is dropped onto the surface of the second glass away from the intermediate layer, the needle drop height H2 of the surface of the second glass away from the intermediate layer meets the following conditions: H2 ≥ 300 mm.

[0039] A fourth aspect of the present application provides a vehicle, comprising a vehicle body and a glass assembly as provided in the third aspect of the present application, wherein the glass assembly is mounted on the vehicle body; wherein, in the glass assembly, the first glass is closer to the interior space of the vehicle body than the second glass.

[0040] The vehicle provided in the fourth aspect of the present application adopts the glass assembly provided in the third aspect of the present application. The first glass in the glass assembly can maintain the first glass's ability to resist bending and fracture at a general chemical strengthening level and the first glass has a relatively thin thickness. The relationship between CS0, CS1, DOL1, CS2, DOL2, DOL3, and t is defined by a formula, so that the first area, second area, and third area of ​​the first glass can cooperate with each other, thereby improving the first glass's resistance to general heavy scratches, sharp object squeezing, and impact defects, thereby improving the surface needle drop performance of the first glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0042] FIG1 is a schematic curve diagram showing the distribution of glass thickness and compressive stress of glass in one embodiment of the present application.

[0043] FIG2 is a schematic diagram of the structure of glass in one embodiment of the present application.

[0044] FIG3 is a process flow chart of a method for preparing glass in one embodiment of the present application.

[0045] FIG4 is a schematic structural diagram of a glass assembly in one embodiment of the present application.

[0046] Explanation of reference numerals: glass-1, first zone-11, second zone-12, third zone-13, glass assembly-2, first glass-21, intermediate layer-22, second glass-23. DETAILED DESCRIPTION

[0047] The following are preferred implementations of the present application. It should be noted that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

[0048] Before introducing the technical solutions of the present application, the technical problems in the related technologies are introduced in detail.

[0049] Ultra-thin chemically tempered glass with a thickness of 1.1mm or less, used in laminated automotive windows, reduces the total thickness of the glass and improves the overall bending strength and rigidity of the laminated glass. However, thin chemically tempered glass is susceptible to scratches, bumps, and impacts from hard objects in vehicle installation environments, resulting in localized damage to the thin glass (for example, point impact damage or linear scratch damage). When the depth of the localized damage reaches or approaches the depth achieved by a single ion exchange strengthening, the central tensile stress causes the localized damage to easily expand and extend, forming large-scale cracks starting from the damage point and extending in one or more directions to the edge of the glass, forming splinters.

[0050] In the field of automotive glass, the falling needle test (also known as the anti-sand and stone test) is generally used to evaluate the crack propagation characteristics of the glass surface after being damaged by uncertain hard objects. The experimental process is as follows: a steel cylinder with a diamond tip (hereinafter referred to as "falling needle": diameter 4.6mm, length 25mm, total mass 3.2g, diamond tip angle 120°, top tip curvature radius 0.1mm) is placed in a rigid straight tube and freely falls. Starting from the minimum drop height (hmin), impact is performed on all specified impact points. The minimum drop height (hmin) is the height required for the preset minimum impact resistance. Then the height is increased by 50mm each time and the impact is performed again until the glass breaks. The spacing between each impact point should be at least 4mm. The maximum height at which the edge and center of the glass can withstand the impact of the falling needle without crack propagation is measured. The height of the needle drop is primarily related to the glass thickness and stress distribution, and shows a phenomenon where the greater the glass strengthening stress, the lower the needle drop height. Existing experiments have shown that the greater the central tensile stress of the glass, the lower the needle drop height it can withstand. The needle drop height of glass of the same thickness and different strengthening states can be ranked as follows: original glass > physical heat strengthening > physical semi-tempered > physical fully tempered (and inversely correlated with the degree of glass strengthening). For chemically tempered glass, due to the micron-level thickness of the stress layer, the central tensile stress is strongly correlated with the glass thickness. When the thickness of chemically tempered glass is above 2mm, its needle drop height is comparable to that of physically semi-tempered glass. However, when the glass thickness is further reduced (≤1.1mm), the central tensile stress of the glass increases significantly while the surface compressive stress and stress layer depth remain unchanged. At this point, the needle drop height is even lower than that of physically fully tempered glass. As a result, despite the high bending strength of the glass, its ability to resist impact from high-hardness sharp objects without cracking is greatly reduced. In other words, the glass surface has a low tolerance for new defects, and cracks will propagate even after being damaged by tiny sizes. In actual terminal feedback, there has also been occasional cracking.

[0051] However, although the original glass and the glass in the low stress state have high needle drop performance, automotive glass also needs a certain ability to resist bending deformation without breaking. This mechanical property shows a strong positive correlation with the compressive stress on the glass surface. Therefore, when we want the glass to have high bending strength and good needle drop performance at the same time, it is contradictory for glass below 1.2mm, and it is often impossible to take both into account under the existing technical conditions.

[0052] Therefore, to address the aforementioned issues, this application provides a glass that addresses the issue of chemically tempered thin glass being susceptible to crack propagation when impacted by hard, sharp objects. This improves the needle drop resistance of the inner surface of chemically tempered laminated glass, enabling the surface of chemically tempered glass to withstand general heavy scratches. Defects caused by impact or impact from sharp objects are less likely to propagate, reducing the probability of spontaneous splintering. Furthermore, this glass maintains the same resistance to bending fracture as typical chemically strengthened glass, resolving the issue of these two conflicting mechanical properties being difficult to achieve on glass 1.2mm thick or less.

[0053] Please refer to Figures 1 and 2. Figure 1 is a graph showing the distribution of glass thickness and compressive stress in one embodiment of the present application. Figure 2 is a schematic diagram showing the structure of glass in one embodiment of the present application.

[0054] This embodiment provides a glass 1, which has a first zone 11, a second zone 12, and a third zone 13. The second zone 12 is located in the first zone 11, and the third zone 13 is located in the second zone 12. The first zone 11, the second zone 12, and the third zone 13 all extend from the outer surface of the glass 1 toward the center of the glass 1. The glass 1 satisfies the following conditions: (CS0+CS1)*DOL1+(CS1+CS2)*(DOL2-DOL1)+CS2*(DOL3-DOL2)≤24*t, and CS0≥600MPa, DOL1+DOL2+DOL3≥0.25t.

[0055] Wherein, CS0 represents the surface compressive stress of the glass 1, CS1 represents the inflection point stress of the glass 1 in the first ion exchange process and the second ion exchange process, DOL1 represents the inflection point depth of the glass 1 in the first ion exchange process and the second ion exchange process, CS2 represents the inflection point stress of the glass 1 in the thermal strengthening process and the first ion exchange process, DOL2 represents the inflection point depth of the glass 1 in the thermal strengthening process and the first ion exchange process, DOL3 represents the stress depth of the glass 1 in the thermal strengthening process, and t represents the thickness of the glass 1.

[0056] In one embodiment, the first region 11 is formed by a thermal strengthening process, the second region 12 is formed by a first ion exchange process, and the third region 13 is formed by a second ion exchange process.

[0057] As shown in Figure 2, first region 11 can be understood as the area of ​​glass 1 formed through the thermal strengthening process. Second region 12 is located within first region 11 and can be understood as the area formed through both the thermal strengthening process and the first ion exchange process. Third region 13 is located within second region 12, that is, third region 13 is also located within first region 11 and can be understood as the area formed through not only the thermal strengthening process but also the first and second ion exchange processes. Furthermore, first region 11, second region 12, and third region 13 all extend from the outer surface of glass 1 toward the center of glass 1.

[0058] Glass 1 is first formed into a first region 11 through a thermal strengthening process, then into a second region 12 through a first ion exchange process, and finally into a third region 13 through a second ion exchange process. In glass 1, the relationship between CS0, CS1, DOL1, CS2, DOL2, DOL3, and t conforms to the above formula, allowing the first region 11, second region 12, and third region 13 of glass 1 to cooperate with each other to improve the shatter resistance of glass 1. After glass 1 is subjected to an impact, cracks will not propagate toward the center and will not enter the center of glass 1. It should be noted that when a defect formed by an impact reaches the central tensile stress layer, the crack will propagate horizontally in all directions under the influence of the central tensile stress. In other words, the purpose of a deeper compressive stress layer DOL is to prevent impact defects from easily reaching the central tensile stress layer, while controlling the smaller central tensile stress is to prevent crack propagation after the defect reaches the central tensile stress layer.

[0059] CS0 represents the surface compressive stress on the outer surface of glass 1. CS1 also represents the compressive stress at the interface between the third region 13, distal from the outer surface of glass 1, and the second region 12. DOL1 also represents the thickness of third region 13. CS2 also represents the compressive stress at the interface between the second region 12, distal from the outer surface of glass 1, and the first region 11. DOL2 also represents the thickness of second region 12. DOL3 also represents the thickness of first region 11.

[0060] Optionally, the compressive stress of the third region 13 is greater than the compressive stress of the second region 12 excluding the third region 13. The compressive stress of the second region 12 excluding the third region 13 is greater than the compressive stress of the first region 11 excluding the second region 12.

[0061] Optionally, the thickness of the third region 13 is smaller than the thickness of the second region 12 excluding the third region 13. The thickness of the second region 12 excluding the third region 13 is smaller than the thickness of the first region 11 excluding the second region 12.

[0062] Optionally, the glass 1 further comprises a central region, which is further away from the outer surface of the glass 1 than the first region 11, and the first region 11 is disposed around the central region; the tensile stress in the central region is less than the compressive stress in the first region 11. Further, optionally, the tensile stress in the central region is less than the compressive stress in the first region 11 excluding the second region 12. Further, optionally, the thickness of the central region is greater than the thickness of the first region 11. Even further, optionally, the thickness of the central region is greater than the thickness of the first region 11 excluding the second region 12.

[0063] In related art, when glass 1 is struck by a general heavy scratch, a sharp object extrusion, or an impact defect, the impact or impact crack must pass through the outer surface of glass 1 and enter the center of glass 1, causing glass 1 to shatter. However, in the present application, when glass 1 is struck by a general heavy scratch, a sharp object extrusion, or an impact defect, the impact or impact crack must pass through the third region 13, the portion of the second region 12 excluding the third region 13, and the portion of the first region 11 excluding the second region 12 before entering the center of glass 1. In other words, when glass 1 is struck by a general heavy scratch, a sharp object extrusion, or an impact defect, the impact or impact crack must pass through the third region 13, the second region 12, and the first region 11 before entering the center of glass 1.

[0064] Specifically, the above formula defines the relationship between CS0, CS1, DOL1, CS2, DOL2, DOL3, and t, thereby defining the compressive stress in the third zone 13, the compressive stress in the portion of the second zone 12 excluding the third zone 13, and the compressive stress in the portion of the first zone 11 excluding the second zone 12. Combined with the thickness of the third zone 13, the thickness of the portion of the second zone 12 excluding the third zone 13, and the thickness of the portion of the first zone 11 excluding the second zone 12, it is difficult for impact or impact cracks to penetrate the third zone 13, the second zone 12, and the first zone 11, and difficult to enter the center of the glass 1, thereby improving the shatter resistance of the glass 1.

[0065] (CS0+CS1)*DOL1+(CS1+CS2)*(DOL2-DOL1)+CS2*(DOL3-DOL2)≤24*t is mainly used to limit the compressive stress of the first zone 11, the second zone 12, and the third zone 13, thereby improving the anti-shattering strength of the glass 1, and reducing the tensile stress value of the central zone to improve the surface needle drop performance of the glass 1. CS0≥600MPa is mainly used to maintain the ability of the glass 1 to resist bending fracture at the general chemical strengthening level. DOL1+DOL2+DOL3≥0.25t is mainly used to make the glass 1 have a total stress layer depth as high as possible at a thinner thickness to resist sharp objects from penetrating the tensile stress layer, thereby improving the needle drop performance of the glass 1. The above three limiting formulas cooperate with each other to jointly limit the compressive stress of each zone of the glass 1, the thickness of each zone, and the thickness of the glass 1.

[0066] Therefore, this embodiment can define the relationship among CS0, CS1, DOL1, CS2, DOL2, DOL3, and t through a formula while maintaining the general chemical strengthening level of the glass 1's ability to resist bending and fracture, and while the glass 1 has a relatively thin thickness, so that the first zone 11, the second zone 12, and the third zone 13 of the glass 1 can cooperate with each other, thereby improving the glass 1's resistance to shattering after withstanding general heavy scratches, extrusion by sharp objects, and impact defects, thereby improving the surface needle drop performance of the glass 1.

[0067] Please refer to Figures 1 and 2. In one embodiment, in the glass 1, CS0, CS1, and DOL1 meet the following conditions: 600MPa≤CS0≤900MPa, 200MPa≤CS1≤300MPa, 0.005mm≤DOL1≤0.015mm.

[0068] Alternatively, CS0 may be 650 MPa, or 700 MPa, or 750 MPa, or 800 MPa, or 850 MPa, etc. Alternatively, CS1 may be 220 MPa, or 250 MPa, or 280 MPa, etc. Alternatively, DOL1 may be 0.008 mm, or 0.010 mm, or 0.012 mm, etc.

[0069] In this embodiment, by limiting CS0 to 600MPa-900MPa, the outer surface of glass 1 maintains a high compressive stress, thereby enhancing the resistance of glass 1 to bending fracture. Furthermore, by limiting CS0 and CS1, the compressive stress in the third zone 13 decreases along the direction from the outer surface of glass 1 to the center of glass 1, thereby improving the glass 1's resistance to shattering after general heavy scratches, sharp object extrusion, and impact defects, thereby enhancing the glass 1's surface resistance to needle drop. Simultaneously, the high compressive stresses of CS0 and CS1 ensure that the third zone 13 of glass 1 has a high resistance to bending fracture. Furthermore, by limiting DOL1, this embodiment allows the third zone 13 to maintain a relatively thin thickness while improving the surface resistance to needle drop.

[0070] Please refer to FIG. 1 and FIG. 2 . In one embodiment, in the glass 1 , CS2 and DOL2 satisfy the following conditions: 5 MPa≤CS2≤15 MPa, 0.035 mm≤DOL2≤0.055 mm.

[0071] Alternatively, CS2 may be 8 MPa, 10 MPa, 12 MPa, etc. Alternatively, DOL2 may be 0.040 mm, 0.045 mm, 0.050 mm, etc.

[0072] In this embodiment, by limiting CS2 and cooperating with CS0 and CS1, the compressive stress in the third zone 13 and the portion of the second zone 12 excluding the third zone 13 in the direction from the outer surface of the glass 1 to the center of the glass 1 tends to decrease. In other words, the compressive stress in the second zone 12 tends to decrease, thereby further improving the anti-shattering strength of the glass 1 after withstanding general heavy scratches, extrusion by sharp objects, and impact defects. It is difficult for impact or impact cracks to penetrate the third zone 13 and the portion of the second zone 12 excluding the third zone 13, and it is more difficult for impact or impact cracks to enter the center of the glass 1, thereby further improving the surface needle drop performance of the glass 1.

[0073] Furthermore, this embodiment defines DOL2. On the one hand, this allows the portion of the second zone 12 excluding the third zone 13 to maintain a relatively thin thickness while improving the surface needle drop performance of the glass 1. On the other hand, DOL2 can cooperate with DOL1 to make the portion of the second zone 12 excluding the third zone 13 thicker than the third zone 13, making it more difficult for impact or impact cracks to penetrate the portion of the second zone 12 excluding the third zone 13. This further increases the difficulty for impact or impact cracks to enter the center of the glass 1, further improving the surface needle drop performance of the glass 1.

[0074] Please refer to FIG. 1 and FIG. 2 . In one embodiment, in the glass 1 , DOL3 and t satisfy the following conditions: DOL3 ≥ 0.25t, 0.7 mm ≤ t ≤ 1.2 mm.

[0075] Alternatively, t may be 0.9 mm, 1 mm, or 1.1 mm. Alternatively, DOL3 ≥ 0.175 mm. Further, 0.175 mm ≤ DOL3 ≤ 0.3 mm. DOL3 may be 0.2 mm, 0.25 mm, or 0.28 mm. Alternatively, the compressive stress in the first region 11 away from the outer surface of the glass 1 is 0 MPa.

[0076] In this embodiment, by limiting the portion of the first zone 11 excluding the second zone 12 and cooperating with CS2, CS0, and CS1, the compressive stress in the third zone 13, the portion of the second zone 12 excluding the third zone 13, and the portion of the first zone 11 excluding the second zone 12 in the direction from the outer surface of the glass 1 to the center of the glass 1 tends to decrease. In other words, the compressive stress in the first zone 11 tends to decrease, thereby further improving the anti-shattering strength of the glass 1 after withstanding general heavy scratches, extrusion by sharp objects, and impact defects, making it difficult for impact or impact cracks to penetrate the third zone 13, the portion of the second zone 12 excluding the third zone 13, and the portion of the first zone 11 excluding the second zone 12, further increasing the difficulty for impact or impact cracks to enter the center of the glass 1, and further improving the surface needle drop performance of the glass 1.

[0077] Furthermore, this embodiment defines the relationship between DOL3 and t. This allows the portion of the first zone 11 excluding the second zone 12 to maintain a relatively thin thickness while improving the surface needle drop performance of the glass 1. Furthermore, DOL3, in conjunction with DOL2 and DOL1, allows the portion of the first zone 11 excluding the second zone 12 to be thicker than the portion of the second zone 12 excluding the third zone 13. This makes it more difficult for impact or cracks to penetrate the portion of the first zone 11 excluding the second zone 12, further increasing the difficulty for impact or cracks to enter the center of the glass 1 and further improving the surface needle drop performance of the glass 1.

[0078] Please refer to Figures 1 and 2. In one embodiment, the glass 1 also meets the following condition: (CS0-CS1) / DOL1≥2.5*(CS1-CS2) / (DOL2-DOL1).

[0079] This embodiment uses the above formula to define the relationship between the stress slope before the inflection point depth DOL1 and the stress slope between DOL1 and DOL2, thereby defining the stress change slope of the third zone 13 and the portion of the second zone 12 excluding the third zone 13, so that the compressive stress in the third zone 13 and the portion of the second zone 12 excluding the third zone 13 is smaller, making it more difficult for impact or impact cracks to break through the third zone 13 and the portion of the second zone 12 excluding the third zone 13, further improving the surface needle drop performance of the glass 1.

[0080] In one embodiment, the central tensile stress CT of the glass 1 satisfies the following condition: CT≤30 MPa.

[0081] Optionally, the central tensile stress CT can be 5 MPa, 10 MPa, 15 MPa, 20 MPa, 25 MPa, etc. This embodiment provides the glass 1 with a lower central tensile stress relative to the central tensile stress CT of the glass 1, thereby increasing the glass 1's resistance to general severe scratches, sharp object extrusion, and impact defects, thereby improving the surface needle drop resistance of the glass 1.

[0082] Please refer to Figures 1 to 3. Figure 3 is a process flow chart of a method for preparing glass in one embodiment of the present application. The present application also provides a method for preparing glass 1, which comprises:

[0083] S100, providing glass to be processed.

[0084] S200 , performing a thermal strengthening process on the glass to be processed to obtain a first strengthened glass.

[0085] In one embodiment, the step of performing a heat strengthening process on the glass to be processed includes:

[0086] The surface compressive stress σ1 of the glass to be treated satisfies the following conditions: 5MPa≤σ1≤15MPa, and in the glass to be treated, the value ranges of DOL3 and t satisfy: DOL3≥0.25t, 0.7mm≤t≤1.2mm, thereby obtaining the first strengthened glass.

[0087] In one embodiment, during the heat strengthening process, the glass to be treated is heated at a temperature of T1, and the heated glass to be treated is cooled at a wind pressure of P; T1 and P satisfy the following conditions: 550°C≤T1≤750°C, 50mmWC≤P≤220mmWC.

[0088] The surface compressive stress of the glass 1 is lower than that of the physical tempering (cooling air pressure ≥ 600 mmWC) and the physical semi-tempered (cooling air pressure ≥ 300 mmWC).

[0089] Optionally, the step of performing a heat strengthening process on the glass to be processed includes:

[0090] The glass to be processed is subjected to bending processing to make the glass to be processed into a curved shape.

[0091] The thermal strengthening process is performed above the Tg of glass 1 and may also include bending the glass 1 to form a desired shape. In subsequent manufacturing processes, both the first and second ion exchange processes are performed below the Tg of glass 1, without changing the shape of glass 1.

[0092] S300: performing a first ion exchange process on the first strengthened glass to obtain a second strengthened glass.

[0093] In one embodiment, the step of performing a first ion exchange process on the first strengthened glass includes:

[0094] The second strengthened glass is obtained by making the surface compressive stress σ2 of the first strengthened glass satisfy the following conditions: 300 MPa≤σ2≤500 MPa, and in the first strengthened glass, CS2 and DOL2 satisfy the following conditions: 5 MPa≤CS2≤15 MPa, 0.035 mm≤DOL2≤0.055 mm.

[0095] In one embodiment, during the first ion exchange process, the first strengthened glass satisfies one of the following conditions:

[0096] A mixed salt bath of potassium nitrate and sodium nitrate is used; wherein the mass ratio of potassium nitrate to sodium nitrate is (80-95):(5-20), the temperature of the first ion exchange process is T2, and the time is C1, and T2 and C1 meet the following conditions: 380°C≤T2≤450°C, 60min≤C1≤150min.

[0097] Alternatively, a potassium nitrate salt bath is used; wherein the proportion of potassium nitrate in the salt is not less than 95%, the first ion exchange process includes a daughter ion exchange process and a daughter ion migration process, the temperature of the daughter ion exchange process is T3, the time is C2, T3 and C2 meet the following conditions: 380°C ≤ T3 ≤ 450°C, 50min ≤ C2 ≤ 100min; the daughter ion migration process is not immersed in the potassium nitrate salt bath, but is completed in air, the migration temperature is T4, the migration time is C3, T4 and C3 meet the following conditions: 450°C ≤ T4 ≤ 500°C, 10min ≤ C3 ≤ 60min;

[0098] In other words, a ≥95% potassium nitrate salt bath is used, exchange is performed at 380°C-450°C for 50 min-100 min, and then ion migration is performed at 450°C-500°C for 10 min-60 min to reduce the surface compressive stress and achieve the desired DOL2.

[0099] Alternatively, an ion exchange barrier layer is formed on the first tempered glass using a potassium nitrate salt bath; wherein the proportion of potassium nitrate in the salt is not less than 95%, and the temperature of the first ion exchange process is T5 and the time is C4, and T5 and C4 meet the following conditions: 380°C ≤ T5 ≤ 450°C, 90min ≤ C4 ≤ 180min.

[0100] This embodiment provides a variety of technical solutions for the first ion exchange process, which can be selected and used flexibly according to the material and type of the glass to be processed.

[0101] S400 , performing a second ion exchange process on the second strengthened glass to obtain the glass 1 provided above in the present application.

[0102] In one embodiment, the step of performing a second ion exchange process on the second strengthened glass includes:

[0103] The surface compressive stress σ3 of the second tempered glass satisfies the following conditions: 600 MPa≤σ3≤900 MPa, and in the second tempered glass, CS1 and DOL1 satisfy the following conditions: 200 MPa≤CS1≤300 MPa, 0.005 mm≤DOL1≤0.015 mm, thereby obtaining the glass 1.

[0104] Wherein, σ3 is equal to CS0, which is the surface compressive stress of the final glass 1.

[0105] In one embodiment, during the second ion exchange process, a potassium nitrate salt bath is used; wherein the proportion of potassium nitrate in the salt is not less than 95%, the temperature of the second ion exchange process is T6, and the time is C5, and T6 and C5 meet the following conditions: 400°C≤T6≤450°C, 120s≤C5≤600s.

[0106] Therefore, the preparation method of the glass 1 of this embodiment, by preparing the glass 1 provided above in this application, can maintain the glass 1's ability to resist bending and fracture at a general chemical strengthening level and the glass 1 has a relatively thin thickness, and define the relationship between CS0, CS1, DOL1, CS2, DOL2, DOL3, and t through a formula, so that the first area 11, the second area 12, and the third area 13 of the glass 1 can cooperate with each other, thereby improving the glass 1's resistance to general heavy scratches, sharp object extrusion, and impact defects. The anti-shattering strength, thereby improving the surface needle drop performance of the glass 1.

[0107] Please refer to Figures 1-2 and 4, which is a schematic diagram of the structure of a glass assembly in one embodiment of the present application. The present application also provides a glass assembly 2, which includes an intermediate layer 22, a first glass 21, and a second glass 23. The first glass 21 is the glass 1 provided above in the present application, and the first glass 21 and the second glass 23 are respectively arranged on opposite sides of the intermediate layer 22.

[0108] Optionally, the first glass 21 is aluminosilicate glass 1. Further optionally, the composition of the aluminosilicate glass 1 includes but is not limited to the following oxide components: 50% to 70% SiO2, 4% to 22% Al2O3, 8% to 18% Na2O, 0% to 5% Li2O, 0% to 1% CaO, 1% to 5% MgO, 0% to 10% K2O, 0% to 0.08% Fe2O3, 0% to 2% ZrO2, and 0% to 5% B2O3.

[0109] Optionally, the second glass 23 is soda-lime silicate glass 1. The thickness of the second glass 23 is 1.6 mm to 5.0 mm. The second glass 23 is physically strengthened.

[0110] In one embodiment, when a needle with a diameter of 4.6 mm, a length of 25 mm, a total mass of 3.2 g, and a diamond tip angle of 120° is dropped onto the surface of the first glass 21 facing away from the intermediate layer 22, the needle drop height H1 of the surface of the first glass 21 facing away from the intermediate layer 22 satisfies the following condition: H1 ≥ 200 mm.

[0111] Optionally, the needle drop height H1 can be 220 mm, or 240 mm, or 250 mm, etc. In the glass assembly 2 of this embodiment, the needle drop height H1 of the surface of the first glass 21 facing away from the interlayer 22 can be greater than 200 mm. While maintaining the first glass 21's ability to resist bending and fracture at a general chemical strengthening level and having a relatively thin thickness, the relationship between CS0, CS1, DOL1, CS2, DOL2, DOL3, and t is defined by a formula, so that the first area 11, the second area 12, and the third area 13 of the first glass 21 can cooperate with each other, thereby improving the first glass 21's shatter resistance after withstanding general heavy scratches, extrusion by sharp objects, and impact defects, thereby improving the surface needle drop performance of the first glass 21.

[0112] In one embodiment, when a needle with a diameter of 4.6 mm, a length of 25 mm, a total mass of 3.2 g, and a diamond tip angle of 120° is dropped onto the surface of the second glass 23 facing away from the intermediate layer 22, the needle drop height H2 of the surface of the second glass 23 facing away from the intermediate layer 22 satisfies the following condition: H2 ≥ 300 mm.

[0113] In the glass assembly 2 of this embodiment, the needle drop height H2 of the second glass 23 away from the surface of the intermediate layer 22 can be greater than 300 mm, which can be combined with the first glass 21 to improve the anti-shattering strength of the glass assembly 2 after withstanding general heavy scratches, sharp object squeezing, and impact defects, thereby improving the surface needle drop performance of the glass 1.

[0114] The present application provides a vehicle, comprising a vehicle body and the glass assembly provided above, wherein the glass assembly is mounted on the vehicle body; wherein, in the glass assembly, the first glass is closer to the interior space of the vehicle body than the second glass.

[0115] The vehicle provided in this embodiment adopts the glass assembly provided above in this application. The first glass in the glass assembly can maintain the first glass's ability to resist bending and fracture at a general chemical strengthening level and have a relatively thin thickness. The relationship between CS0, CS1, DOL1, CS2, DOL2, DOL3, and t is defined by a formula, so that the first area, second area, and third area of ​​the first glass can cooperate with each other, thereby improving the first glass's resistance to general heavy scratches, sharp object squeezing, and impact defects, thereby improving the surface needle drop performance of the first glass.

[0116] The following provides examples 1-3 and comparative examples 1-10 to provide a detailed introduction to the glass assembly. The preparation method of the glass assembly is as follows:

[0117] 1. According to the automotive glass processing process, the soda-lime glass and the aluminosilicate glass are cut and edge-ground, and necessary decorative layers such as ink and silver paste are applied to the soda-lime glass as needed.

[0118] 2. Thermally bending and physically strengthening the soda lime silicate glass, including but not limited to thermal strengthening, semi-tempered and fully tempered, according to the mechanical requirements corresponding to the glass loading position.

[0119] 3. The aluminosilicate glass is thermally strengthened and bent into a shape matching that of the soda-lime glass, and a surface compressive stress in the range of 5 MPa to 15 MPa and a stress layer depth DOL3 of ≥0.25t are formed on the surface.

[0120] 4. The aluminosilicate glass obtained by low-stress ion exchange strengthening step 3 has a surface compressive stress in the range of 300 MPa to 500 MPa, a DOL2 in the range of 0.035 mm to 0.055 mm, and an inflection point stress CS2 in the range of 5 MPa to 15 MPa at DOL2.

[0121] 5. The aluminosilicate glass obtained in step 4 is strengthened by high-stress ion exchange, so that it has a final surface stress CS0 in the range of 600 MPa to 900 MPa, a DOL1 in the range of 0.005 mm to 0.015 mm, and an inflection stress CS1 in the range of 200 MPa to 300 MPa formed at DOL1, thereby obtaining the composite-strengthened aluminosilicate glass.

[0122] 6. Using conventional organic interlayers as raw materials, including but not limited to PVB, EVA, etc., the physically strengthened soda-lime glass and the composite strengthened aluminosilicate glass are sandwiched to obtain the automotive glass.

[0123] With the door glass as the vehicle installation location, soda-lime glass was physically tempered. Examples 1 to 3 were produced according to the aluminosilicate embodiment. In addition, comparative examples 1 to 10 were produced using conventional aluminosilicate glass strengthening methods and a strengthening method similar to the present invention but not meeting the composite stress conditions described in the present invention. The processing parameters of the examples and comparative examples are shown in Table 1:

[0124] Table 1 Processing parameters of examples and comparative examples

[0125] A composite structure of 3.5 mm soda-lime glass and 1.1 mm aluminosilicate glass was selected. After strengthening the thin inner aluminosilicate glass according to the embodiments and comparative examples, laminated glass was produced while maintaining other process conditions unchanged. A pin drop test was used to test the inner surface pin drop height. Furthermore, 1.1 mm samples of the embodiments and comparative examples were produced according to the three-point bending method specified in GBT 34171, and their three-point bending strength was tested. The stress distribution of each embodiment and comparative example is shown in Table 2, and the technical results are shown in Table 3.

[0126] Table 2 Stress distribution of examples and comparative examples

[0127] Table 3 Technical Effects of Examples and Comparative Examples

[0128] As can be seen from Table 3, Examples 1-3, which are manufactured according to the preparation method provided in this application and meet the stress requirements, have the characteristics of high bending strength (bending strength ≥ 450 MPa) and good needle drop performance, taking into account the contradictory mechanical properties of bending strength and crack propagation, so that chemically tempered thin glass can be better used in automotive glass usage scenarios to meet the requirements of safety, reliability and durability.

[0129] From the M value and CT value in Examples 1-3 and Comparative Examples 1-10, it can be seen that the M value and the CT value are quantitatively positively correlated. That is, as the M value increases, the central tensile stress of the glass also increases. In order to avoid the cracks caused by the impact of the glass due to the excessively large CT value, it is necessary to meet the needle drop performance by limiting the size of the M value.

[0130] Comparative Examples 1 and 2 are only heat strengthened. Although the M value is small (the central tensile stress CT value is small) and the needle drop performance is high, the three-point bending strength is insufficient due to the low surface compressive stress CS0.

[0131] Comparative Example 3 uses only one low level ion exchange to strengthen the glass, and its surface compressive stress CS0 is low, resulting in low three-point bending strength.

[0132] In Comparative Example 4, the glass was subjected to two ion exchange treatments (the first at a lower level and the second at a higher level) without heat strengthening. The deeper compressive stress layer obtained without heat strengthening treatment was easy for a needle to penetrate the compressive stress layer and cause expansion.

[0133] Although Comparative Example 5 adopted a high level of thermal strengthening treatment for the glass plate, only a low level of ion exchange was used during the chemical strengthening stage. Not only was the surface compressive stress CS0 low, but the M value was also large, which resulted in the three-point bending strength and needle drop performance failing to meet the requirements.

[0134] In Comparative Example 6, the glass plate was subjected to a higher level of heat strengthening treatment. The compressive stress CS2 caused by the heat strengthening was higher, which in turn led to a larger M value. Specifically, it was manifested as a larger central tensile stress CT value, which could not meet the requirements of the needle drop performance test.

[0135] In Comparative Example 7, the glass plate was subjected to a lower level of heat strengthening treatment and only one high level of ion exchange was performed, resulting in an increase in DOL1 and a larger M value, which was specifically manifested as a larger central tensile stress CT value and could not meet the requirements of the needle drop performance experiment.

[0136] In comparative example 8, the glass plates were subjected to a lower level of heat strengthening treatment and only underwent secondary high-level ion exchange, which resulted in an increase in DOL1 and a larger M value, specifically a larger central tensile stress CT value, which could not meet the requirements of the needle drop performance test.

[0137] In Comparative Example 9, the glass sheet was subjected to a lower level of heat strengthening treatment and only one low level of ion exchange was performed. The surface compressive stress CS0 was relatively low and could not meet the three-point bending strength requirement.

[0138] In Comparative Example 10, the glass sheet was subjected to a relatively low level of heat strengthening treatment and only underwent secondary low-level ion exchange. The surface compressive stress CS0 was relatively low and could not meet the three-point bending strength requirement.

[0139] The above is a detailed introduction to the contents provided in the implementation mode of the present application. This article explains and illustrates the principles and implementation modes of the present application. The above explanation is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation mode and application scope. In summary, the contents of this specification should not be understood as limiting the present application.

Claims

1. A glass, characterized in that: The glass comprises a first region, a second region, and a third region, wherein the second region is located within the first region, and the third region is located within the second region, wherein the first region, the second region, and the third region all extend from an outer surface of the glass toward a center of the glass, and wherein the glass satisfies the following conditions: (CS0+CS1)*DOL1+(CS1+CS2)*(DOL2-DOL1)+CS2*(DOL3-DOL2)≤24*t, and CS0≥600 MPa, and DOL1+DOL2+DOL3≥0.25t; Wherein, CS0 represents the surface compressive stress of the glass, CS1 represents the inflection point stress of the glass in the first ion exchange process and the second ion exchange process, DOL1 represents the inflection point depth of the glass in the first ion exchange process and the second ion exchange process, CS2 represents the inflection point stress of the glass in the thermal strengthening process and the first ion exchange process, DOL2 represents the inflection point depth of the glass in the thermal strengthening process and the first ion exchange process, DOL3 represents the stress depth of the glass in the thermal strengthening process, and t represents the thickness of the glass.

2. The glass according to claim 1, wherein In the glass, CS0, CS1, and DOL1 satisfy the following conditions: 600 MPa≤CS0≤900 MPa, 200 MPa≤CS1≤300 MPa, 0.005 mm≤DOL1≤0.015 mm.

3. The glass according to claim 1, wherein In the glass, CS2 and DOL2 satisfy the following conditions: 5 MPa≤CS2≤15 MPa, 0.035 mm≤DOL2≤0.055 mm.

4. The glass according to claim 1, wherein In the glass, DOL3 and t satisfy the following conditions: DOL3 ≥ 0.25t, 0.7 mm ≤ t ≤ 1.2 mm.

5. The glass according to claim 1, wherein The glass also satisfies the following condition: (CS0-CS1) / DOL1≥2.5*(CS1-CS2) / (DOL2-DOL1).

6. The glass according to claim 1, wherein The central tensile stress CT of the glass satisfies the following condition: CT≤30 MPa.

7. The glass according to claim 1, wherein The first region is formed by a thermal strengthening process, the second region is formed by a first ion exchange process, and the third region is formed by a second ion exchange process.

8. A method for preparing glass, characterized in that: The preparation method comprises: Provide glass to be processed; Performing a thermal strengthening process on the glass to be treated to obtain a first strengthened glass; performing a first ion exchange process on the first strengthened glass to obtain a second strengthened glass; The second strengthened glass is subjected to a second ion exchange process to obtain the glass according to any one of claims 1 to 7.

9. The preparation method according to claim 8, wherein The step of performing a heat strengthening process on the glass to be processed includes: The surface compressive stress σ1 of the glass to be treated satisfies the following conditions: 5MPa≤σ1≤15MPa, and in the glass to be treated, the value ranges of DOL3 and t satisfy: DOL3≥0.25t, 0.7mm≤t≤1.2mm, thereby obtaining the first strengthened glass.

10. The preparation method according to claim 9, characterized in that During the heat strengthening process, the glass to be treated is heated at a temperature of T1, and the heated glass to be treated is cooled at a wind pressure of P; T1 and P satisfy the following conditions: 550°C≤T1≤750°C, 50mmWC≤P≤220mmWC.

11. The preparation method according to claim 8, characterized in that The step of performing a first ion exchange process on the first strengthened glass includes: The second strengthened glass is obtained by making the surface compressive stress σ2 of the first strengthened glass satisfy the following conditions: 300 MPa≤σ2≤500 MPa, and in the first strengthened glass, CS2 and DOL2 satisfy the following conditions: 5 MPa≤CS2≤15 MPa, 0.035 mm≤DOL2≤0.055 mm.

12. The preparation method according to claim 11, characterized in that During the first ion exchange process, the first strengthened glass satisfies one of the following conditions: A mixed salt bath of potassium nitrate and sodium nitrate is used; wherein the mass ratio of potassium nitrate to sodium nitrate is (80-95):(5-20), the temperature of the first ion exchange process is T2, and the time is C1, and T2 and C1 meet the following conditions: 380°C≤T2≤450°C, 60min≤C1≤150min; A potassium nitrate salt bath is used; wherein the proportion of potassium nitrate in the salt is not less than 95%, the first ion exchange process includes a daughter ion exchange process and a daughter ion migration process, the temperature of the daughter ion exchange process is T3, the time is C2, T3 and C2 meet the following conditions: 380°C ≤ T3 ≤ 450°C, 50min ≤ C2 ≤ 100min; the daughter ion migration process is not immersed in the potassium nitrate salt bath, but is completed in air, the migration temperature is T4, the migration time is C3, T4 and C3 meet the following conditions: 450°C ≤ T4 ≤ 500°C, 10min ≤ C3 ≤ 60min; An ion exchange barrier layer is formed on the first tempered glass using a potassium nitrate salt bath, wherein the potassium nitrate accounts for no less than 95% of the salt. The first ion exchange process is performed at a temperature of T5 and a time of C4, wherein T5 and C4 satisfy the following conditions: 380°C ≤ T5 ≤ 450°C, and 90 min ≤ C4 ≤ 180 min.

13. The preparation method according to claim 8, wherein The step of performing a second ion exchange process on the second strengthened glass includes: The surface compressive stress σ3 of the second tempered glass satisfies the following conditions: 600 MPa≤σ3≤900 MPa, and in the second tempered glass, CS1 and DOL1 satisfy the following conditions: 200 MPa≤CS1≤300 MPa, 0.005 mm≤DOL1≤0.015 mm, thereby obtaining the glass.

14. The preparation method according to claim 13, wherein During the second ion exchange process, a potassium nitrate salt bath is used; wherein, the proportion of potassium nitrate in the salt is not less than 95%, the temperature of the second ion exchange process is T6, and the time is C5, and T6 and C5 meet the following conditions: 400°C≤T6≤450°C, 120s≤C5≤600s.

15. A glass assembly, characterized in that: The glass assembly includes an intermediate layer, a first glass, and a second glass. The first glass is the glass according to any one of claims 1 to 7. The first glass and the second glass are respectively arranged on opposite sides of the intermediate layer.

16. The glass assembly according to claim 15, wherein When a needle with a diameter of 4.6 mm, a length of 25 mm, a total mass of 3.2 g and a diamond tip angle of 120° is dropped onto the surface of the first glass facing away from the intermediate layer, the needle drop height H1 of the surface of the first glass facing away from the intermediate layer meets the following conditions: H1 ≥ 200 mm.

17. The glass assembly according to claim 15, wherein When a needle with a diameter of 4.6 mm, a length of 25 mm, a total mass of 3.2 g and a diamond tip angle of 120° is dropped onto the surface of the second glass facing away from the intermediate layer, the needle drop height H2 of the surface of the second glass facing away from the intermediate layer meets the following conditions: H2 ≥ 300 mm.

18. A vehicle, characterized in that: The vehicle includes a vehicle body and a glass assembly according to any one of claims 15 to 17, wherein the glass assembly is mounted on the vehicle body; wherein, in the glass assembly, the first glass is closer to the interior space of the vehicle body than the second glass.

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