Ceramic glass composite part with high impact resistance, preparation method of ceramic glass composite part and electronic equipment

Abstract

The invention discloses a ceramic glass composite part with strong impact resistance, a preparation method thereof and electronic equipment, the composite part is composed of a ceramic layer, a glass layer and a bonding layer, the bending strength of the composite part is more than 1000MPa, or / and the falling ball performance is not lower than 37cm, or / and the point pressure value is not lower than 110N.

Description

Technical Field

[0001] This invention belongs to the field of new materials, specifically relating to a ceramic-glass composite with strong impact resistance, its preparation method, and electronic equipment. Background Technology

[0002] With the rapid development of the smartphone industry, consumers have increasingly higher performance requirements for mobile phone back panels. They demand not only a good appearance but also excellent mechanical strength, impact resistance, and lightweight properties. Currently, the main materials used for mobile phone back panels include metals, glass, ceramics, and composite materials. Among these, ceramic materials offer advantages such as high strength, high hardness, and wear resistance, but suffer from brittleness, poor impact resistance, and difficulty in processing. Glass materials offer high transparency and are easy to process, but lack sufficient mechanical strength and are easily broken. A single material is insufficient to meet the stringent comprehensive performance requirements of mobile phone back panels.

[0003] To address the aforementioned issues, composite structures of ceramics and glass have emerged in related technologies. For example, patent publication number CN208410950U discloses an impact-resistant shell material and a digital product shell. This impact-resistant shell material includes a surface layer and an energy-absorbing layer connecting the surface layer; the surface layer is made of ceramic, microcrystalline glass, or ordinary glass; the energy-absorbing layer is made of a high-modulus material. The digital product shell also includes a surface layer and an energy-absorbing layer connecting the surface layer; the surface layer is made of ceramic, microcrystalline glass, or ordinary glass; the energy-absorbing layer is made of a high-modulus material. The impact-resistant shell material of this invention provides a surface finish and a certain degree of impact resistance through the surface layer, while the energy-absorbing layer, made of a high-modulus, high-toughness material, absorbs impact energy and protects the surface layer, thus improving the overall impact resistance of the structure. Existing composite structures generally suffer from poor bonding stability, insufficient precision in controlling the adhesive layer thickness, and excessive overall thickness after lamination, resulting in limited improvement in the impact resistance of the composite component and failing to fully meet the requirements for mobile phone back panels. Therefore, developing a ceramic-glass composite material with both ultra-thin thickness and significantly improved impact resistance, as well as its mobile phone back panel, has become a pressing technical problem to be solved in this field. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a ceramic-glass composite material that combines ultra-thin thickness with strong impact resistance, the specific technical solution of which is as follows: A ceramic-glass composite with strong impact resistance is composed of a ceramic layer, a glass layer and an adhesive layer. The ceramic layer and the glass layer are bonded together by the adhesive layer. The thickness of the ceramic-glass composite is 0.3-0.6 mm, and its bending strength is above 1000 MPa or / and its drop ball performance is not less than 37 cm or / and its point pressure value is not less than 110 N. In some embodiments, the thickness of the ceramic-glass composite is 0.3 mm, 0.31 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, 0.40 mm, 0.41 mm, 0.42 mm, 0.43 mm, 0.44 mm, 0.45 mm, 0.46 mm, 0.47 mm, 0.48 mm, 0.49 mm, 0.50 mm, 0.51 mm, 0.52 mm, 0.53 mm, 0.54 mm, 0.55 mm, 0.56 mm, 0.57 mm, 0.58 mm, 0.59 mm, or 0.60 mm, or a value within a range defined by any two of the above specific values ​​as endpoints; its flexural strength is 1000 MPa, 1030 MPa, 1050 MPa, 1100 MPa, or 1... The pressure is 130MPa or 1150MPa, or a value within the range of any two of the above specific values ​​as endpoints; the drop ball performance is 37cm or 38cm or 39cm or 40cm or 41cm or 42cm or 43cm or 44cm or 45cm, or a value within the range of any two of the above specific values ​​as endpoints; the point pressure value is 110N or 115N or 120N or 125N or 130N, or a value within the range of any two of the above specific values ​​as endpoints; furthermore, its Young's modulus is 380-420GPa, and in some embodiments, the Young's modulus is 380GPa or 385GPa or 390GPa or 395GPa or 400GPa or 405GPa or 410GPa or 415GPa or 420GPa, or a value within the range of any two of the above specific values ​​as endpoints.

[0005] The thickness of the ceramic layer is 0.09-0.30 mm. In some embodiments, the thickness of the ceramic layer is 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, or 0.30 mm, or a value within the range defined by any two of the above specific values ​​as endpoints. The thickness of the glass layer is 0.15-0.30 mm. In some embodiments, the thickness of the glass layer is... The thickness is 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, or 0.30mm, or a value within the range defined by any two of the above specific values ​​as endpoints; the thickness of the adhesive layer is 0.005-0.05mm, and in some embodiments, the thickness of the adhesive layer is 0.005mm, 0.01mm, 0.02mm, 0.03mm, 0.04mm, or 0.05mm, or a value within the range defined by any two of the above specific values ​​as endpoints.

[0006] Preferably, the thickness ratio of the ceramic layer to the glass layer in the composite is 0.4-1.4. More preferably, it is 0.41-1.36; more preferably, it is 0.55-1.14. In some embodiments, the thickness ratio of the ceramic layer to the glass layer in the composite is 0.4 or 0.41 or 0.42 or 0.43 or 0.44 or 0.45 or 0.46 or 0.47 or 0.48 or 0.49 or 0.5 or 0.51 or 0.52 or 0.53 or 0.54 or 0.55 or 0.56 or 0.57 or 0.58 or 0.59 or 0.6 or 0.61 or 0.62 or... 0.63 or 0.64 or 0.65 or 0.66 or 0.67 or 0.68 or 0.69 or 0.7 or 0.71 or 0.72 or 0.73 or 0.74 or 0.75 or 0.76 or 0.77 or 0.78 or 0.79 or 0.8 or 0.81 or 0.82 or 0.83 or 0.84 or 0.85 or 0.86 or 0.87 or 0.88 or 0.89 or 0.9 Or 0.91 or 0.92 or 0.93 or 0.94 or 0.95 or 0.96 or 0.97 or 0.98 or 0.99 or 1 or 1.01 or 1.02 or 1.03 or 1.04 or 1.05 or 1.06 or 1.07 or 1.08 or 1.09 or 1.1 or 1.11 or 1.12 or 1.13 or 1.14 or 1.15 or 1.16 or 1.17 or 1.18 The value may be 1.19, 1.2, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28, 1.29, 1.3, 1.31, 1.32, 1.33, 1.34, 1.35, 1.36, 1.37, 1.38, 1.39, or 1.4, or any value within the range of values ​​defined by any two of the above specific values ​​as endpoints.

[0007] The ceramic layer is zirconia ceramic or silicon nitride ceramic; the glass layer is microcrystalline glass or chemically strengthened ordinary glass (ordinary strengthenable glass in the prior art, using a common chemical strengthening process); the adhesive layer is an epoxy resin base layer or an acrylic resin base layer. Further, the microcrystalline glass is lithium disilicate microcrystalline glass, magnesium aluminum silicon microcrystalline glass, or LAS-based microcrystalline glass.

[0008] A method for preparing the aforementioned ceramic-glass composite with strong impact resistance includes the following steps: Step 1: Bond a ceramic layer with a thickness of 0.25-0.45mm to a glass layer with a thickness of 0.15-0.30mm using an adhesive layer with a thickness of 0.005-0.05mm to obtain the initial composite part; Step 2: Curing the initial composite obtained in Step 1, using UV curing and / or heat curing and / or hot pressing curing. Step 3: The composite part obtained in Step 2 is thinned to reduce the thickness of the ceramic layer to 0.09-0.30 mm to obtain the final product.

[0009] The adhesive layer preparation process in step 1 can be a slot coating process, a doctor blade coating process, or a dispensing coating process. Preferably, when using a slot coating process, the coating speed is 30~50mm / s, the coating pressure is 0.1~0.3MPa, and the coating gap is 0.01~0.1mm to ensure the uniformity of the adhesive layer; when using a doctor blade coating process, the doctor blade angle is 30°~60°, the coating speed is 20~40mm / s, and the doctor blade gap is 0.005~0.05mm to precisely control the adhesive layer thickness; when using a dispensing coating process, the dispensing pressure is 0.2~0.4MPa, the dispensing speed is 15~30mm / s, and the dispensing spacing is 2~5mm, achieving uniform coverage of the adhesive layer through subsequent bonding and compaction.

[0010] The specific UV curing process in step 2 involves irradiating with ultraviolet light at a wavelength of 320~390nm, an irradiation intensity of 1000~4000mJ / cm², and an irradiation time of 20~60s; hot pressing curing involves a curing temperature of 60~100℃, a curing pressure of 0.5~1.5MPa, and a curing time of 1~24h; and thermal curing involves a curing temperature of 60~100℃ and a curing time of 1~24h.

[0011] The specific process for thinning in step 3 is as follows: coarse grinding followed by fine grinding; coarse grinding uses a 320~600 mesh diamond grinding wheel, a spindle speed of 3000~5000 rpm, a feed rate of 5~10 μm / s, and a downward pressure of 20~50 N to remove excess thickness of the ceramic layer; fine grinding uses a 2000~3000 mesh resin-bonded diamond grinding wheel, a spindle speed of 8000~12000 rpm, a feed rate of 0.5~1 μm / s, and a downward pressure of 5~15 N to improve the flatness of the outer surface of the ceramic layer, so that the final surface roughness Ra of the outer surface of the ceramic layer is ≤0.01 μm.

[0012] An electronic device comprising the aforementioned ceramic-glass composite with strong impact resistance.

[0013] The second technical solution provided by the present invention is: a ceramic-glass composite with strong impact resistance, which is composed of a ceramic layer, a glass layer and an adhesive layer. The thickness ratio of the ceramic layer to the glass layer is 0.4-1.4, and the thickness of the adhesive layer accounts for 1-11.5% of the total thickness of the composite. The composite has a bending strength of more than 1000MPa or / and a drop ball performance of not less than 37cm or / and a point pressure value of not less than 110N.

[0014] Furthermore, the thickness of this ceramic-glass composite is 0.3-0.6 mm.

[0015] Preferably, the thickness ratio of the ceramic layer to the glass layer in the composite is 0.4-1.4. More preferably, it is 0.41-1.36; more preferably, it is 0.55-1.14. In some embodiments, the thickness ratio of the ceramic layer to the glass layer in the composite is 0.4 or 0.41 or 0.42 or 0.43 or 0.44 or 0.45 or 0.46 or 0.47 or 0.48 or 0.49 or 0.5 or 0.51 or 0.52 or 0.53 or 0.54 or 0.55 or 0.56 or 0.57 or 0.58 or 0.59 or 0.6 or 0.61 or 0.62 or... 0.63 or 0.64 or 0.65 or 0.66 or 0.67 or 0.68 or 0.69 or 0.7 or 0.71 or 0.72 or 0.73 or 0.74 or 0.75 or 0.76 or 0.77 or 0.78 or 0.79 or 0.8 or 0.81 or 0.82 or 0.83 or 0.84 or 0.85 or 0.86 or 0.87 or 0.88 or 0.89 or 0.9 Or 0.91 or 0.92 or 0.93 or 0.94 or 0.95 or 0.96 or 0.97 or 0.98 or 0.99 or 1 or 1.01 or 1.02 or 1.03 or 1.04 or 1.05 or 1.06 or 1.07 or 1.08 or 1.09 or 1.1 or 1.11 or 1.12 or 1.13 or 1.14 or 1.15 or 1.16 or 1.17 or 1.18 The value may be 1.19, 1.2, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28, 1.29, 1.3, 1.31, 1.32, 1.33, 1.34, 1.35, 1.36, 1.37, 1.38, 1.39, or 1.4, or any value within the range of values ​​defined by any two of the above specific values ​​as endpoints.

[0016] The thickness of the ceramic layer accounts for 27-56% of the total thickness of the composite. In some embodiments, the thickness of the ceramic layer accounts for 27% or 28% or 29% or 30% or 31% or 32% or 33% or 34% or 35% or 36% or 37% or 38% or 39% or 40% or 41% or 42% or 43% or 44% or 45% or 46% or 47% or 48% or 49% or 50% or 51% or 52% or 53% or 54% or 55% or 56% of the total thickness of the composite, or a value within the range of any two of the above specific values ​​as endpoints.

[0017] The thickness of the glass layer accounts for 40-67% of the total thickness of the composite. In some embodiments, the thickness of the glass layer accounts for 40% or 41% or 42% or 43% or 44% or 45% or 46% or 47% or 48% or 49% or 50% or 51% or 52% or 53% or 54% or 55% or 56% or 57% or 58% or 59% or 60% or 61% or 62% or 63% or 64% or 65% or 66% or 67% of the total thickness of the composite, or a value within the range of any two of the above specific values ​​as endpoints.

[0018] The thickness of the adhesive layer accounts for 1-11.5% of the total thickness of the composite. In some embodiments, the thickness of the adhesive layer is 1% or 1.2% or 2% or 3% or 4% or 5% or 6% or 7% or 8% or 9% or 10% or 11% or 11.1% or 11.5% of the total thickness of the composite, or a value within the range of any two of the above specific values ​​as endpoints.

[0019] A method for preparing the aforementioned ceramic-glass composite with strong impact resistance includes the following steps: Step 1: The ceramic layer and the glass layer are bonded together with an adhesive layer at a thickness ratio of 1.13-2.04 to obtain an initial composite. Preferably, in this step, the thickness of the adhesive layer accounts for 0.8-8.10% of the total thickness of the composite. More preferably, in this step, the thickness of the ceramic layer is preferably 0.25-0.45 mm, the thickness of the glass layer is preferably 0.15-0.30 mm, and the thickness of the adhesive layer is preferably 0.005-0.05 mm. Step 2: Curing the initial composite obtained in Step 1, using UV curing and / or heat curing and / or hot pressing curing. Step 3: Thin the composite part obtained in Step 2 so that the thickness of the ceramic layer accounts for 27-56% of the total thickness of the composite part and the thickness ratio of the ceramic layer to the glass layer is 0.4-1.4, to obtain the final product.

[0020] The adhesive layer preparation process in step 1 can be a slot coating process, a doctor blade coating process, or a dispensing coating process. Preferably, when using a slot coating process, the coating speed is 30~50mm / s, the coating pressure is 0.1~0.3MPa, and the coating gap is 0.01~0.1mm to ensure the uniformity of the adhesive layer; when using a doctor blade coating process, the doctor blade angle is 30°~60°, the coating speed is 20~40mm / s, and the doctor blade gap is 0.005~0.05mm to precisely control the adhesive layer thickness; when using a dispensing coating process, the dispensing pressure is 0.2~0.4MPa, the dispensing speed is 15~30mm / s, and the dispensing spacing is 2~5mm, achieving uniform coverage of the adhesive layer through subsequent bonding and compaction.

[0021] The specific UV curing process in step 2 involves irradiating with ultraviolet light at a wavelength of 320~390nm, an irradiation intensity of 1000~4000mJ / cm², and an irradiation time of 20~60s; and hot-press curing with a curing temperature of 60~100℃, a curing pressure of 0.5~1.5MPa, and a curing time of 1~24h.

[0022] The specific process for thinning in step 3 is as follows: coarse grinding followed by fine grinding; coarse grinding uses a 320~600 mesh diamond grinding wheel, a spindle speed of 3000~5000 rpm, a feed rate of 5~10 μm / s, and a downward pressure of 20~50 N to remove excess thickness of the ceramic layer; fine grinding uses a 2000~3000 mesh resin-bonded diamond grinding wheel, a spindle speed of 8000~12000 rpm, a feed rate of 0.5~1 μm / s, and a downward pressure of 5~15 N to improve the flatness of the outer surface of the ceramic layer, so that the final surface roughness Ra of the ceramic is ≤0.01 μm.

[0023] An electronic device comprising the aforementioned ceramic-glass composite with strong impact resistance.

[0024] This invention achieves the following: 1. Stress field optimization: The surface compressive stress formed after thinning can passivate or suppress newly generated micro subsurface cracks during the thinning process, and even if new defects are introduced, their propagation risk is significantly reduced; 2. Interface stress relief: The redistribution of residual stress reduces harmful tensile stress or peeling stress at the interface, allowing the interface bonding potential to be fully utilized and improving the overall load-bearing capacity; 3. Surface defect elimination: Thinning directly removes or reduces existing large-size defects on the surface, avoiding the failure path of crack initiation from the surface and propagation to the interface, thereby protecting the interface integrity.

[0025] The composite component undergoes the following process from composite to thinning: 1. Initial state: The composite component contains a potentially unoptimal residual stress field. Its outer surface has large, randomly distributed microcracks and scratches introduced during manufacturing and handling; these large defects are the main limiting factors for its strength. 2. Thinning: Precise layer-by-layer material removal. In this dynamic process, the original surface layer is physically removed, introducing new, smaller, and more controllable processing defects onto the newly formed surface. Simultaneously, a strong surface compressive stress layer forms, and the material removal disrupts the original mechanical equilibrium. 3. Finally, a new equilibrium state is reached. In this new state, the composite component achieves triple optimization: 1) Stress optimization: The surface is covered with a layer of protective compressive stress introduced by processing, uniformly distributed and with controllable depth. Simultaneously, harmful internal tensile stress peaks may be alleviated due to global reconstruction. 2) Defect optimization: The maximum defect size controlling material strength is reduced, and strength weaknesses are addressed. 3) Interface optimization: The stress environment in the interface region is improved, and the microstructural gradient in the vicinity may play a more significant positive role under the new geometric configuration. This triple optimization synergistic effect results in the thinned composite component being thinner in macroscopic dimensions, but stronger in microscopic load-bearing capacity and reliability.

[0026] Of course, precise design of the initial layer thicknesses is the fundamental prerequisite for achieving the thinning-strength effect. Different initial layer thickness ratios determine the magnitude, distribution, and total strain energy of the initial residual stress field. This initial state determines whether the thinning process is optimized or degraded. This scheme proposes and verifies the optimal window for the thickness ratio of the ceramic layer to the glass layer, the proportion of the adhesive layer, and other parameters. An optimal window explored in the three-dimensional index system of strength-toughness-thickness achieves superlinear superposition of performance at the ultimate scale; the brittleness of the ceramic and glass is compensated and transformed by the plasticity of the adhesive layer; the final performance far exceeds the performance of a single material at the same thickness, and also exceeds the expectation of linear superposition of the two properties.

[0027] Furthermore, the amount of thinning (i.e., the thickness removed) is itself a crucial process parameter. Insufficient thinning may fail to completely remove the original harmful defect layer or form a sufficiently deep surface compressive stress layer; excessive thinning may weaken the overall load-bearing cross-section of the structure or reach areas of concentrated harmful tensile stress within the structure, thus leading to performance degradation. Therefore, there exists an optimal thinning thickness that maximizes the aforementioned multiple positive effects.

[0028] The mobile phone back panel made from the ultra-thin ceramic-glass composite material with strong impact resistance described in this invention achieves the following beneficial effects: 1. Its bending strength can reach 1150MPa, the drop ball height is not less than 37cm, and the point pressure performance is not less than 110N; 2. The targeted thinning process effectively reduces the constraint of the brittleness of the ceramic layer while ensuring structural strength, reduces stress concentration at the interface, and can dissipate more impact energy; at the same time, it reduces the overall weight of the composite material, meeting the design requirements of lightweight mobile phones; 3. The coating process, curing process, and thinning process parameters of this invention are highly controllable, suitable for industrial mass production, and the selected materials are widely available and cost-controllable, possessing extremely high practical value; 4. Compared with back panels made of single ceramic or single glass materials, the ultra-thin ceramic-glass composite mobile phone back panel of this invention has significantly improved drop ball impact resistance and point pressure bearing capacity, and has a longer service life. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the manufacturing process of the ceramic-glass composite component of the present invention; Figure 2 This is a physical image of the ultrathin ceramic-glass composite component according to Embodiment 1 of this patent.

[0030] Among them, 1-ceramic layer; 2-adhesive layer; 3-glass layer. Detailed Implementation

[0031] Example 1

[0032] Adopting such Figure 1 The processing flow shown is as follows: Step 1: Zirconia ceramic with an initial thickness of 0.35 mm is used as the ceramic layer, and lithium disilicate microcrystalline glass with a thickness of 0.22 mm is used as the glass layer. The ceramic layer and the glass layer are bonded together with an epoxy resin-based adhesive layer with a thickness of 0.02 mm. The adhesive layer is prepared by slit coating process. During coating, the coating speed is 30~50 mm / s, the coating pressure is 0.1~0.3 MPa, and the coating gap is 0.01~0.1 mm to ensure the uniformity of the adhesive layer. Step 2: Perform curing treatment, using a process of UV curing followed by heat curing. The specific curing process is as follows: UV curing irradiation parameters: wavelength 360nm, intensity 3600mJ / cm², light exposure 40s; heat curing parameters: temperature 80℃, time 1h. Step 3: Thinning treatment is performed, first with rough grinding and then with fine grinding. For rough grinding, a 320-600 grit diamond wheel is used, with a spindle speed of 3000-5000 rpm, a feed rate of 5-10 μm / s, and a pressure of 20-50 N to remove excess thickness from the ceramic substrate. For fine grinding, a 2000-3000 grit resin-bonded diamond wheel is used, with a spindle speed of 8000-12000 rpm, a feed rate of 0.5-1 μm / s, and a pressure of 5-15 N to improve the flatness of the ceramic surface, ensuring a final surface roughness Ra ≤ 0.01 μm. Ultimately, the ceramic layer thickness is reduced by 0.17 mm, resulting in a final composite part thickness of 0.42 mm.

[0033] The final composite component underwent the following tests: 1. Drop ball performance test: A steel ball with a diameter of 20mm and a weight of 32g was dropped freely from a specified height using a solid PVC clamp as the support. The composite component fixed with adhesive backing (0.2~0.3mm) was observed for any breakage or cracks. The highest drop height from which no damage occurred was taken as the drop ball performance index. 2. Point pressure performance test: A pressure testing machine was used to apply point pressure at a rate of 1mm / min. The pressure value at which damage occurred was recorded as the point pressure performance index. 3. Bending strength test: A four-point bending test method was used, based on GB / T 6569-2006 standard. The composite component was processed into a standard specimen of 60mm×40mm×(actual thickness). The lower support point spacing was set to 40mm, and the upper support point spacing was set to 20mm. The test was conducted at a rate of 10mm / min. The loading rate is achieved by applying uniform pressure to the specimen through a double indenter, recording the maximum load at which the specimen breaks, and calculating the bending strength using the four-point bending strength formula; 4. The Young's modulus test is performed simultaneously with the four-point bending test data. During the elastic deformation stage, the load change and the corresponding change in deflection at the midpoint of the specimen are recorded to eliminate the influence of shear force, and the Young's modulus is derived using the elasticity bending theory; 5. The above four tests are completed simultaneously to comprehensively characterize the mechanical properties of the composite.

[0034] The composite component in this embodiment has a bending strength of 1130 MPa, a Young's modulus of 420 GPa, a drop ball strength of 45 cm, and a point pressure strength of 130 N.

[0035] Example 2

[0036] Unlike in Example 1, the thickness reduction in step 3 is 0.26 mm for the ceramic layer, resulting in a final total thickness of 0.33 mm for the composite. Performance test results: flexural strength of 1020 MPa, Young's modulus of 385 GPa, drop ball performance of 38 cm, and point pressure performance of 118 N.

[0037] Example 3

[0038] Unlike in Example 1, the thickness reduction in step 3 is 0.23 mm for the ceramic layer, resulting in a final total thickness of 0.36 mm for the composite. Performance test results: flexural strength is 1060 MPa, Young's modulus is 405 GPa, drop ball performance is 41 cm, and point pressure performance is 122 N.

[0039] Example 4

[0040] Unlike in Example 1, the thickness reduction in step 3 is 0.20 mm for the ceramic layer, resulting in a final total thickness of 0.39 mm for the composite. Performance test results: flexural strength is 1100 MPa, Young's modulus is 415 GPa, drop ball performance is 43 cm, and point pressure performance is 127 N.

[0041] Example 5

[0042] Unlike in Example 1, the thickness reduction in step 3 is 0.13 mm for the ceramic layer, resulting in a final total thickness of 0.46 mm for the composite. Performance test results: flexural strength of 1050 MPa, Young's modulus of 410 GPa, drop ball performance of 42 cm, and point pressure performance of 125 N.

[0043] Example 6

[0044] Unlike in Example 1, the thickness reduction in step 3 is 0.10 mm for the ceramic layer, resulting in a final total thickness of 0.49 mm for the composite. Performance test results: flexural strength of 1030 MPa, Young's modulus of 400 GPa, drop ball performance of 40 cm, and point pressure performance of 120 N.

[0045] Example 7

[0046] Unlike in Example 1, the thickness reduction in step 3 is 0.05 mm for the ceramic layer, resulting in a final total thickness of 0.54 mm for the composite. Performance test results: flexural strength of 1000 MPa, Young's modulus of 380 GPa, drop ball performance of 37 cm, and point pressure performance of 116 N.

[0047] Comparative Example 1 Unlike Example 1, step 3 is omitted. In this example, the final composite part has a total thickness of 0.59 mm. Performance test results: bending strength is 950 MPa, Young's modulus is 330 GPa, drop ball performance is 32 cm, and point pressure performance is 108 N.

[0048] Comparative Example 2 In this comparative example, only zirconia ceramic with a thickness of 0.59 mm and the same material as in Example 1 was used. The performance test results were as follows: flexural strength of 920 MPa, Young's modulus of 300 GPa, drop ball performance of 29 cm, and point pressure performance of 100 N.

[0049] Comparative Example 3 In this comparative example, only microcrystalline glass with a thickness of 0.59 mm and the same material as in Example 1 was used. The performance test results were as follows: bending strength of 890 MPa, Young's modulus of 280 GPa, drop ball performance of 26 cm, and point pressure performance of 90 N.

[0050] The composition and performance data of Examples 1-7 and Comparative Examples 1-3 are shown in Tables 1-1 and 1-2, and the thickness relationship between the layers in Examples 1-7 is shown in Table 1-3. Wherein S1 represents Example 1; S2 represents Example 2, and so on; D1 represents Comparative Example 1, D2 represents Comparative Example 2, and so on.

[0051] Table 1-1

[0052] Table 1-2

[0053] Table 1-3

[0054] As shown in Comparative Examples 1-3, the composite component of Comparative Example 1 exhibits superior performance compared to Comparative Examples 2 and 3, where the composite layer is a single glass or ceramic layer. Furthermore, as shown in Examples 1-7 and Comparative Example 1, when the ceramic layer thickness is reduced from 0 mm (without reduction) to 0.17 mm, the total thickness of the composite component decreases from 0.59 mm to 0.42 mm, the flexural strength increases from 950 MPa to 1130 MPa, the Young's modulus increases from 330 GPa to 420 GPa, the drop ball resistance increases from 32 cm to 45 cm, and the point pressure resistance increases from 108 N to 130 N, with all mechanical properties significantly optimized. When the ceramic layer thickness is further increased to 0.26 mm, the total thickness of the composite component decreases to 0.33 mm, but its flexural strength, Young's modulus, and impact resistance all show a significant decrease, with a drop ball resistance of only 38 cm and a point pressure resistance of 118 N. The applicant argues that moderately thinning the ceramic layer can reduce existing defects within the ceramic, decrease stress concentration, and optimize the modulus matching between the ceramic and glass, thereby enhancing the synergistic load-bearing capacity of the composite structure. However, excessive thinning weakens the supporting effect of the ceramic layer, preventing it from fully utilizing its high strength and ultimately affecting the overall performance of the composite. Therefore, when the ceramic layer thickness is controlled between 0.17 and 0.20 mm, the composite achieves optimal overall performance, corresponding to a total thickness of 0.39 to 0.42 mm, meeting the dual requirements of lightweight and high performance for mobile phone back panels.

[0055] This method is also applicable to ordinary glass, as shown in Example 8 and Comparative Examples 4-5.

[0056] Example 8

[0057] Unlike Example 1, in step 1 of this example, chemically strengthened ordinary aluminosilicate glass was used, and the final composite material had a total thickness of 0.42 mm. The performance test results were as follows: bending strength of 1035 MPa, Young's modulus of 395 GPa, drop ball performance of 40 cm, and point pressure performance of 118 N.

[0058] Comparative Example 4 Unlike Comparative Example 1, this comparative example uses the same chemically strengthened ordinary glass as in Example 8, without thinning treatment, with a thickness of 0.59 mm; performance test results: bending strength is 920 MPa, Young's modulus is 315 GPa, drop ball performance is 30 cm, and point pressure performance is 102 N.

[0059] Comparative Example 5 This comparative example only includes ordinary glass with a thickness of 0.59 mm and chemical strengthening. The performance test results are as follows: bending strength is 850 MPa, Young's modulus is 215 GPa, drop ball performance is 20 cm, and point pressure performance is 82 N.

[0060] The composition and performance data of Example 8 and Comparative Examples 4-5 are shown in Tables 2-1 and 2-2.

[0061] Table 2-1

[0062] Table 2-2

[0063] As can be seen from Examples 8, 4 and 5, the mechanical properties of chemically strengthened ordinary glass are improved after being composited with a ceramic layer. After being processed using the product structure and process of the present invention, the mechanical properties are further improved. Compared with Comparative Example 1, the performance of the chemically strengthened ordinary glass-ceramic composite obtained by the present method is better than that of the unthinned microcrystalline glass-ceramic composite.

[0064] Furthermore, the applicant has also studied the initial thickness of the ceramic layer in step 1 of the method of the present invention.

[0065] Example 9

[0066] Unlike Example 1, the initial thickness of the ceramic layer is 0.25 mm, and the final total thickness of the composite is 0.32 mm. Performance test results: bending strength is 1035 MPa, Young's modulus is 405 GPa, drop ball performance is 40 cm, and point pressure performance is 120 N.

[0067] Example 10

[0068] Unlike Example 1, the initial thickness of the ceramic layer is 0.30 mm, and the final total thickness of the composite is 0.37 mm. Performance test results: flexural strength is 1110 MPa, Young's modulus is 415 GPa, drop ball performance is 43 cm, and point pressure performance is 128 N.

[0069] Example 11

[0070] Unlike Example 1, the initial thickness of the ceramic layer is 0.40 mm, and the final total thickness of the composite is 0.47 mm. Performance test results: bending strength is 1080 MPa, Young's modulus is 41 GPa, drop ball performance is 42 cm, and point pressure performance is 125 N.

[0071] Example 12

[0072] Unlike Example 1, the initial thickness of the ceramic layer is 0.45 mm, and the final total thickness of the composite is 0.52 mm. Performance test results: flexural strength is 1025 MPa, Young's modulus is 395 GPa, drop ball performance is 39 cm, and point pressure performance is 120 N.

[0073] The composition and performance data of Examples 9-12 are shown in Tables 3-1 and 3-2.

[0074] Table 3-1

[0075] Table 3-2

[0076] As shown in Examples 1 and 9-12, when the glass layer thickness is 0.22 mm, the initial ceramic layer thickness is 0.35 mm, resulting in optimal performance. However, the performance can be satisfied within the range of 0.25-0.45 mm. Furthermore, the applicant has also investigated the thickness of the glass layer in step 1 of the method of this invention.

[0077] Example 13

[0078] Unlike Example 1, the thickness of the microcrystalline glass layer is 0.12 mm, and the total thickness of the final composite is 0.32 mm. Performance test results: bending strength is 965 MPa, Young's modulus is 325 GPa, drop ball performance is 33 cm, and point pressure performance is 105 N.

[0079] Example 14

[0080] Unlike Example 1, the thickness of the microcrystalline glass layer is 0.16 mm, and the total thickness of the final composite is 0.36 mm. Performance test results: bending strength is 1025 MPa, Young's modulus is 395 GPa, drop ball performance is 40 cm, and point pressure performance is 115 N.

[0081] Example 15

[0082] Unlike Example 1, the thickness of the microcrystalline glass layer is 0.30 mm, and the total thickness of the final composite is 0.50 mm. Performance test results: bending strength is 995 MPa, Young's modulus is 380 GPa, drop ball performance is 38 cm, and point pressure performance is 110 N.

[0083] Example 16

[0084] Unlike Example 1, the thickness of the microcrystalline glass layer is 0.40 mm, and the total thickness of the final composite is 0.55 mm. Performance test results: bending strength is 960 MPa, Young's modulus is 355 GPa, drop ball performance is 35 cm, and point pressure performance is 108 N.

[0085] Example 17

[0086] Unlike Example 1, the thickness of the microcrystalline glass layer is 0.40 mm, and the total thickness of the final composite is 0.60 mm. Performance test results: bending strength is 940 MPa, Young's modulus is 320 GPa, drop ball performance is 32 cm, and point pressure performance is 105 N.

[0087] The composition and performance data of Examples 13-17 are shown in Tables 4-1 and 4-2.

[0088] Table 4-1

[0089] Table 4-2

[0090] As shown in Examples 1 and 13-17, with an initial ceramic layer thickness of 0.35 mm, as the glass layer thickness increases from 0.12 mm to 0.40 mm, the total thickness of the thinned composite increases from 0.32 mm to 0.62 mm. The performance of each component first increases and then decreases, reaching its peak at a glass thickness of 0.22 mm. This is because: if the glass thickness is too thin (≤0.12 mm), the toughness is insufficient to buffer impacts; if it is too thick (≥0.35 mm), the lower modulus of the glass compared to ceramic reduces the overall rigidity of the composite structure and increases the weight of the composite, failing to meet the lightweight requirements of mobile phone back panels. Therefore, in this application, the glass layer thickness is 0.15-0.30 mm, more preferably 0.16-0.30 mm.

[0091] Furthermore, the applicant has also studied the thickness of the adhesive layer in step 1 of the method of the present invention.

[0092] Example 18

[0093] Unlike Example 1, the thickness of the adhesive layer is 0.005 mm, the thickness of the final composite is 0.405 mm, and the performance test results are as follows: bending strength is 1010 MPa, Young's modulus is 390 GPa, drop ball performance is 38 cm, and point pressure performance is 116 N.

[0094] Example 19

[0095] Unlike Example 1, the thickness of the adhesive layer was 0.01 mm, the thickness of the final composite was 0.41 mm, and the performance test results were as follows: bending strength was 1035 MPa, Young's modulus was 405 GPa, drop ball performance was 42 cm, and point pressure performance was 125 N.

[0096] Example 20

[0097] Unlike Example 1, the thickness of the adhesive layer is 0.03 mm, the thickness of the final composite is 0.43 mm, and the performance test results are as follows: bending strength is 1020 MPa, Young's modulus is 400 GPa, drop ball performance is 40 cm, and point pressure performance is 118 N.

[0098] Example 21

[0099] Unlike Example 1, the thickness of the adhesive layer is 0.04 mm, the thickness of the final composite is 0.44 mm, and the performance test results are as follows: bending strength is 1000 MPa, Young's modulus is 380 GPa, drop ball performance is 37 cm, and point pressure performance is 115 N.

[0100] Example 22

[0101] Unlike Example 1, the thickness of the adhesive layer is 0.05 mm, the thickness of the final composite is 0.45 mm, and the performance test results are as follows: bending strength is 975 MPa, Young's modulus is 350 GPa, drop ball performance is 35 cm, and point pressure performance is 110 N.

[0102] The composition and performance data of Examples 18-22 are shown in Tables 5-1 and 5-2.

[0103] Table 5-1

[0104] Table 5-2

[0105] As shown in Examples 1 and 18-22, the thickness of the adhesive layer has a crucial impact on the interfacial bonding strength and overall mechanical properties of the composite. When the adhesive layer thickness is 0.02 mm, the composite exhibits optimal flexural strength, Young's modulus, drop ball performance, and point pressure performance. If the adhesive layer is too thick (e.g., 0.05 mm), internal pores and residual stress are easily generated during the adhesive curing process. Furthermore, the adhesive layer's modulus is lower than that of ceramics and glass, which weakens the overall rigidity of the composite structure, leading to a decrease in flexural strength and impact resistance.

[0106] Example 23

[0107] Unlike Example 1, in step 1, a doctor blade coating method is used to obtain the adhesive layer. During doctor blade coating, the doctor blade angle is 30°~60°, the coating speed is 20~40mm / s, and the doctor blade gap is 0.005~0.05mm. The composite properties obtained by precisely controlling the adhesive layer thickness are: bending strength of 1025MPa, Young's modulus of 390GPa, drop ball performance of 41cm, and point pressure performance of 123N.

[0108] Example 24

[0109] Unlike Example 1, in step 1, an adhesive layer is obtained by dispensing. During dispensing, the dispensing pressure is 0.2~0.4MPa, the dispensing speed is 15~30mm / s, and the dispensing spacing is 2~5mm. Uniform adhesive coverage is achieved through subsequent bonding and compaction. The resulting composite part exhibits the following properties: flexural strength of 970MPa, Young's modulus of 345GPa, drop ball resistance of 35cm, and point pressure resistance of 113N.

[0110] Example 25

[0111] Unlike Example 1, the adhesive layer in step 1 is a polyurethane base layer, and the properties of the resulting composite are: flexural strength of 1020MPa, Young's modulus of 390GPa, drop ball performance of 40cm, and point pressure performance of 110N.

[0112] Example 26

[0113] Unlike Example 1, the adhesive layer in step 1 is an acrylic resin base layer, and the properties of the resulting composite are: flexural strength of 1005 MPa, Young's modulus of 365 GPa, drop ball performance of 37 cm, and point pressure performance of 105 N.

[0114] Example 27

[0115] Unlike Example 1, the ceramic layer in step 1 is a silicon nitride ceramic layer, and the properties of the resulting composite are: bending strength of 1090 MPa, Young's modulus of 410 GPa, drop ball performance of 43 cm, and point pressure performance of 126 N.

[0116] Example 28

[0117] Unlike Example 9, the ceramic layer in step 1 is a silicon nitride ceramic layer, and the properties of the resulting composite are: flexural strength of 1015 MPa, Young's modulus of 390 GPa, drop ball performance of 39 cm, and point pressure performance of 120 N.

[0118] Comparative Example 6 The comparative example contains only silicon nitride ceramics, which are 0.59 mm thick and have a bending strength of 880 MPa, a Young's modulus of 260 GPa, a drop ball performance of 25 cm, and a point pressure performance of 92 N.

[0119] Example 29

[0120] Unlike Example 1, only UV curing was used in step 2, and the properties of the resulting composite were: flexural strength of 930 MPa, Young's modulus of 310 GPa, drop ball performance of 32 cm, and point pressure performance of 105 N.

[0121] Example 30

[0122] Unlike Example 1, step 2 only uses hot pressing for curing, and the resulting composite has the following properties: flexural strength of 970 MPa, Young's modulus of 385 GPa, drop ball performance of 38 cm, and point pressure performance of 116 N.

[0123] As can be seen from the above embodiments and comparative examples, the ceramic-glass composite parts of the present invention exhibit significantly improved mechanical properties compared to components made of single ceramic or single glass materials. Specifically, the drop ball performance of the optimal embodiment 1 reaches 45cm, an improvement of 55.2% compared to a single zirconia ceramic substrate (29cm) and 73% compared to a single microcrystalline glass substrate (26cm); the point pressure performance reaches 130N, an improvement of 20.4% compared to a single zirconia ceramic substrate (108N) and 44.4% compared to a single microcrystalline glass substrate (90N); the flexural strength and Young's modulus are also significantly better than those of a single substrate; they are also superior to composite parts without thinning, with embodiments 1-7 being superior to comparative example 1; the same principle applies to ordinary glass. This fully demonstrates that the present invention, through ceramic-glass composite structure design and thinning process optimization, achieves a synergistic effect of "1+1>2," increasing mechanical properties while reducing thickness, thus meeting the high-performance requirements of lightweight and impact-resistant mobile phone back panels.

Claims

1. A ceramic-glass composite component with strong impact resistance, comprising a ceramic layer, a glass layer, and an adhesive layer, characterized in that, The thickness ratio of the ceramic layer to the glass layer is 0.4-1.4, the thickness of the adhesive layer accounts for 1-11.5% of the total thickness of the composite, the bending strength of the composite is above 1000MPa or / and the drop ball performance is not less than 37cm or / and the point pressure value is not less than 110N.

2. A method for preparing a ceramic-glass composite with strong impact resistance as described in claim 1, characterized in that, Includes the following steps: Step 1: The ceramic layer and the glass layer are bonded together with an adhesive layer at a thickness ratio of 1.13-2.04 to obtain the initial composite part, wherein the thickness of the adhesive layer accounts for 0.8-8.10% of the total thickness of the composite part; Step 2: Curing the initial composite obtained in Step 1, using UV curing and / or heat curing and / or hot pressing curing. Step 3: Thin the composite part obtained in Step 2 so that the thickness of the ceramic layer accounts for 27-56% of the total thickness of the composite part and the thickness ratio of the ceramic layer to the glass layer is 0.4-1.4, to obtain the final product.

3. The method for preparing a ceramic-glass composite with strong impact resistance according to claim 2, characterized in that, The adhesive layer in step 1 is prepared by a slot coating process, a doctor blade coating process, or a dot coating process.

4. The method for preparing a ceramic-glass composite with strong impact resistance according to claim 2, characterized in that, The specific UV curing process in step 2 involves irradiating with ultraviolet light at a wavelength of 320~390nm, an irradiation intensity of 1000~4000mJ / cm², and an irradiation time of 20~60s; and hot-press curing with a curing temperature of 60~100℃, a curing pressure of 0.5~1.5MPa, and a curing time of 1~24h.

5. The method for preparing a ceramic-glass composite with strong impact resistance according to claim 2, characterized in that, The specific process for thinning in step 3 is as follows: coarse grinding followed by fine grinding; coarse grinding uses a 320~600 mesh diamond grinding wheel, a spindle speed of 3000~5000 rpm, a feed rate of 5~10 μm / s, and a downward pressure of 20~50 N to remove excess thickness of the ceramic layer; fine grinding uses a 2000~3000 mesh resin-bonded diamond grinding wheel, a spindle speed of 8000~12000 rpm, a feed rate of 0.5~1 μm / s, and a downward pressure of 5~15 N to improve the flatness of the outer surface of the ceramic layer, so that the final surface roughness Ra of the ceramic is ≤0.01 μm.

6. An electronic device, characterized in that... It contains a ceramic-glass composite with strong impact resistance as described in claim 1.

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