A glass-based cover material, its preparation method, and its application.

Abstract

This invention relates to a glass-based cover plate material, its preparation method, and its application. The preparation method includes the following steps: preparing glass pillars and glass filaments using glass; each glass pillar has at least one through-hole in its axial direction; the diameter of the glass filament is smaller than the inner diameter of the through-hole; thermally reducing the glass pillars and glass filaments to blacken their surfaces, forming an absorption layer, resulting in blackened glass pillars and blackened glass filaments; nesting blackened glass filaments of corresponding dimensions into the through-hole of the blackened glass pillar and performing vacuum melting and pressing to obtain a glass blank; and fabricating the glass blank into a glass-based cover plate material. The preparation method provided by this invention uses glass to prepare glass pillars and glass filaments, and performs thermal reduction on both the glass pillars and glass filaments before nesting them. This shortens the thermal reduction time and improves production efficiency while maintaining the same total absorption layer thickness.

Description

Technical Field

[0001] This invention belongs to the field of smart wearable device technology, and in particular relates to a glass-based cover material, its preparation method, and its application. Background Technology

[0002] In recent years, with the continuous advancement of science and technology, smart wearable devices have been developing towards multifunctionality and integration. Existing smart wearable devices generally have the function of monitoring human physiological conditions such as heart rate, blood oxygen, electrocardiogram, and sleep quality. To achieve this function, a large number of optical channels for sensors are usually added to the back cover of the wearable device, and these optical channels also need to have high anti-crosstalk characteristics for detecting human physiological conditions.

[0003] Currently, the main materials for the cover plates of mainstream smart wearables on the market are metal and ceramic. However, metal cover plates can interfere with the signal acquisition of sensors, while ceramic cover plates are slightly more expensive and their strength is difficult to meet the requirements.

[0004] Glass has garnered significant attention as a novel cover material in recent years. Compared to metals and ceramics, glass offers a more fashionable appearance, exhibits less interference with signal acquisition by smart wearable sensors, and boasts high resolution, high contrast, and transmittance, meeting anti-crosstalk requirements, making it suitable for applications in smart wearable devices. However, the need to incorporate numerous optical channels for sensors on the cover material necessitates the use of both light-absorbing and high-transmittance glass materials. The significant differences in processing properties between these two types of glass make them difficult to fuse under the same processing conditions. Therefore, fusing multiple glass materials together to create a cover material for smart wearables with multiple high-transmittance and highly anti-crosstalk sensor channels has remained a challenging task. Summary of the Invention

[0005] The main objective of this invention is to provide a glass-based cover plate material, its preparation method, and its application. The technical problem to be solved is how to provide a high-efficiency method for preparing a glass-based cover plate material, so that the prepared glass-based cover plate material has a large number of sensor optical channels, reduces scattering during light propagation through a high-efficiency absorption ring, reduces energy loss during light propagation, and basically eliminates interface reflections that exist when different glasses are fused together. It has both high transmittance and high anti-crosstalk performance, and at the same time, it also has high mechanical strength, thus making it more suitable for practical use.

[0006] The objective of this invention and the technical problem it solves are achieved by the following technical solution. A method for preparing a glass-based cover material according to this invention includes the following steps:

[0007] (1) A glass column and a glass filament are prepared using glass; the aforementioned glass column has at least one through hole in its axial direction; the diameter of the aforementioned glass filament is smaller than the inner diameter of the through hole;

[0008] (2) The aforementioned glass column and glass filament are thermally reduced to blacken their surfaces and form an absorption layer, resulting in blackened glass column and blackened glass filament.

[0009] (3) The aforementioned blackened glass wire is nested into the through hole of the aforementioned blackened glass column and vacuum-pressed to obtain a glass blank.

[0010] (4) The aforementioned glass blank is made into a glass base cover plate.

[0011] The objectives of this invention and the technical problems it addresses can be further achieved by the following technical measures.

[0012] Preferably, in the aforementioned preparation method, the thermal reduction method is as follows: the atmosphere is hydrogen, the pressure is 0.03-1 MPa, and the temperature is 480-680°C for 48-800 h.

[0013] Preferably, in the aforementioned preparation method, the aforementioned glass blank is made into a thin sheet, and the aforementioned thin sheet is placed in a 100% KNO3 solution and chemically strengthened at 380-420°C for 6-10 hours to obtain the aforementioned glass-based cover plate material.

[0014] Preferably, in the aforementioned preparation method, the glass composition, by mass percentage, comprises:

[0015] SiO2: 65-75%;

[0016] B2O3: 8-15%;

[0017] Na2O: 5-10%;

[0018] Al2O3: 2-6%;

[0019] Li2O: 2-6%;

[0020] BaO: 0-2%;

[0021] CaO: 0–2%; and,

[0022] Sb₂O₃: 0.2–0.7%.

[0023] Preferably, in the aforementioned preparation method, the glass comprises the following components:

[0024] SiO2: 65-70%;

[0025] Na2O: 7-10%;

[0026] Al2O3: 2-4%;

[0027] Li2O: 4-6%;

[0028] BaO: 1-2%; and,

[0029] CaO: 1-2%.

[0030] Preferably, in the aforementioned preparation method, the composition of the aforementioned glass is (Na2O+Li2O) / (SiO2+Al2O3) = 0.15~0.22.

[0031] The objective of this invention and the technical problem it solves are further achieved by the following technical solution. A glass-based cover material according to this invention comprises:

[0032] Glass substrate; and,

[0033] Absorption ring, the aforementioned absorption ring is embedded in the aforementioned glass substrate with its axis perpendicular to the surface of the aforementioned substrate, penetrating through the upper and lower surfaces of the aforementioned glass substrate.

[0034] The aforementioned absorption ring is obtained by thermal reduction of the aforementioned glass substrate material;

[0035] Specifically, when the thickness of the aforementioned glass substrate is 0.5 mm, the transmittance in the 350–1000 nm range is ≥92%; when the thickness of the aforementioned absorption ring is 0.5 mm, the transmittance in the 350–1000 nm range is <7%.

[0036] The objectives of this invention and the technical problems it solves are also achieved by the following technical solutions.

[0037] According to the present invention, a smart wearable device includes the aforementioned glass-based cover material.

[0038] By employing the above technical solutions, the glass-based cover plate material, its preparation method, and its application proposed in this invention have at least the following advantages:

[0039] The method for preparing glass-based cover plate material proposed in this invention involves preparing glass columns and glass wires using glass. Both the glass columns and glass wires are thermally reduced to blacken their surfaces and form an absorption layer. Then, the blackened glass wires are nested into the through holes of the blackened glass columns and vacuum-pressed to obtain a glass blank, which is then used to make the glass-based cover plate material.

[0040] By blackening glass pillars and glass filaments to form an absorption layer, and then embedding the blackened glass filaments into the through-holes of the blackened glass pillars, the absorption rings in the prepared glass-based cover plate material are embedded within the glass substrate. Because glass has high light transmittance while blackened glass has low light transmittance, several optical paths are formed within the absorption rings on the glass substrate. This structural design allows the glass-based cover plate material to possess both high transmittance and high crosstalk resistance. Furthermore, in the prepared glass-based cover plate material, there is no interface reflection between the absorption rings and the glass substrate. When light propagates within the optical paths, scattering during light propagation can be avoided or reduced, energy loss during light propagation can be reduced, and the propagation distance of light within the glass cover plate can be increased.

[0041] Furthermore, since the absorption layer is formed by glass blackening, the composition of the absorption layer and the non-glass layer is consistent. In subsequent processing, there is no difference in the physical properties of the two materials, resulting in consistent processability and convenient processing.

[0042] Furthermore, since both the glass pillars and glass fibers can be blackened, and both can undergo thermal reduction to generate their own absorption layers, the reduction time for the glass-based cover plate material to form the absorption ring can be effectively reduced. Moreover, the glass pillars and glass fibers have similar compositions, effectively improving melting efficiency. The prepared glass-based cover plate material has no interfaces, which effectively improves its mechanical strength.

[0043] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0044] Figure 1 These are schematic diagrams of the blackened glass filament structure in some embodiments;

[0045] Figure 2 These are schematic diagrams of the blackened glass column structure in some embodiments;

[0046] Figure 3 This is a schematic diagram of the nested structure of blackened glass pillars and blackened glass filaments in some embodiments;

[0047] Figure 4 Schematic diagrams of the glass-based cover material structure in some embodiments.

[0048] Figure 5 Schematic diagrams of the glass-based cover material structure in some embodiments.

[0049] Figure 6 Schematic diagrams of the glass-based cover material structure in some embodiments.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Blackened glass filament; 2. Blackened glass column; 3. Glass substrate cover material; 31. Glass substrate; 32. Absorption ring. Detailed Implementation

[0052] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, provides a detailed description of the specific implementation methods, structures, features, and effects of a glass-based cover plate material, its preparation method, and its application according to the present invention. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable manner.

[0053] These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0054] This invention proposes a method for preparing a glass-based cover material 3, such as... Figures 1-6 As shown, it includes the following steps:

[0055] (1) A glass column and a glass filament are prepared using glass; the aforementioned glass column has at least one through hole in its axial direction; the diameter of the glass filament is smaller than the inner diameter of the through hole;

[0056] (2) Thermal reduction of the glass column and glass filaments to blacken their surfaces, such as... Figures 1-2 As shown, blackened glass filament 1 and blackened glass column 2 are obtained;

[0057] (3) Figure 3 As shown, blackened glass wire 1 of the corresponding size is nested into the through hole of blackened glass column 2 and vacuum melting is performed to obtain glass blank;

[0058] (4) The glass blank is made into glass base cover material 3, such as Figures 4-6 As shown.

[0059] Specifically, in step (1), the glass used to prepare the glass filaments and glass columns is preferably a glass material with high light transmittance, low light transmittance after thermal reduction, and high mechanical strength, so that the glass substrate cover material 3 prepared by it has high transmittance, high anti-crosstalk performance, and good mechanical strength.

[0060] Unperforated glass pillars can be prepared using a grinding rod process. First, the glass pillar material is ground to its target outer diameter, and then polished to ensure a smooth, scratch-free surface with a dimensional accuracy not exceeding ±50μm. Glass fibers can be prepared by drawing the prepared unperforated glass pillars using a high-precision fiber drawing machine. When preparing glass fibers using fiber drawing methods, the prepared unperforated glass pillars can be placed in a fiber drawing machine and drawn to the desired fiber size with a dimensional accuracy not exceeding ±50μm. During fiber drawing, the unperforated glass pillar softens in the high-temperature furnace of the fiber drawing machine before being fixed into a fiber fiber of a specific size. This process significantly reduces the surface roughness of the glass fiber. The preferred method of using prepared unperforated glass pillars to prepare glass fibers in this invention aims to shorten the glass fiber processing time and improve production efficiency.

[0061] Several through holes are drilled along the axial direction on the un-drilled glass column to obtain a glass column with several through holes. These through holes are used to install blackened glass wire 1, therefore the diameter of the through holes matches the outer diameter of the glass wire. Drilling can be performed using any existing drilling method; this invention does not impose specific limitations. Drilling on the glass column is carried out according to pre-designed hole positions and sizes. Based on the requirements of the glass substrate material 3, the preferred number of holes is 1 to 10, and the through holes are distributed in a linear or circular array within any radial section of the glass column. The positioning accuracy and dimensional accuracy of the drilling do not exceed ±50μm; strictly controlling the positioning and dimensional accuracy of the drilling is technically aimed at ensuring the accurate position of the absorption ring 32, thereby avoiding accuracy deviations in the absorption ring 32.

[0062] In step (2), the thermal reduction process only involves the substitution of hydrogen atoms and does not cause any substantial change in the glass composition. Therefore, the composition of the absorbing layer is consistent with that of the non-absorbing layer. On the one hand, there will be no difference in the physical properties of the materials during subsequent processing, resulting in consistent processability and convenient processing. On the other hand, in the glass base cover material 3, the composition of the absorbing ring 32 embedded in the glass substrate 31 is similar to that of the glass substrate 31. There is no interface reflection between the absorbing ring 32 and the glass substrate 31. When light propagates in the optical path, it can avoid or reduce problems such as scattering during light propagation, reduce energy loss during light propagation, and increase the propagation distance of light in the glass base cover.

[0063] Furthermore, since the glass column and glass wire are made of similar materials, on the one hand, both can be thermally reduced to generate their own absorption layers, which can effectively reduce the reduction time of the glass base cover material 3 in forming the absorption ring 32. Moreover, the glass column and glass wire have similar material compositions, which can effectively improve the melting efficiency. On the other hand, the glass base cover material 3 does not have an interface, which can effectively improve the strength of the cover.

[0064] In step (3), the blackened glass wire 1 of the corresponding size is nested into the through hole of the blackened glass column 2 and vacuum-pressed to obtain a glass blank. The assembly of the blackened glass wire 1 and the through hole can adopt the method of assembling any hole and rod in the prior art, and the present invention does not make specific limitations. In order to ensure that the blackened glass wire 1 can be smoothly installed in the through hole of the blackened glass column 2, the present invention preferably uses a clearance fit between the through hole and the glass wire. The matching of the diameter of the through hole and the outer diameter of the glass wire means that the difference between the two is ≤200μm.

[0065] The technical purpose of the vacuum melting and pressing step is to fuse the blackened glass wire 1 and the blackened glass column 2 into a single unit. After the blackened glass wire 1 is nested into the blackened glass column 2, it is placed in a dedicated hot-pressing mold and then placed in a vacuum furnace for vacuum melting and pressing. To ensure that the blackened glass wire 1 and the blackened glass column 2 are fused into a single unit, the vacuum degree of this invention is preferably 0.01–1 MPa, the melting and pressing temperature is 500–800°C, the melting and pressing time is 10–480 min, and the compression ratio of the vacuum melting and pressing is preferably 0.75–0.95. After vacuum melting and pressing, it is demolded to obtain a glass blank.

[0066] In step (4), the glass blank is subjected to processes such as head cutting, rounding, slicing, flat grinding, fine carving, and polishing to obtain the glass base cover material 3. The technical purpose of this step is to control the quality and dimensions of the glass base cover material 3.

[0067] In some embodiments, in step (1), the diameter of the un-drilled glass column is 30-50 mm and the length is 500-600 mm; the un-drilled glass column is cut into lengths of 50-300 mm and then drilled, and the diameter of the through hole is 8-30 mm.

[0068] Based on the application scenario of glass-based cover material 3, the diameter of the glass column is preferably 30-50 mm. To ensure the transmission efficiency and quality of the optical path, the aperture of the through hole is preferably 8-30 mm; to ensure processing efficiency and drilling quality, the drilling depth is preferably 50-300 mm. To ensure the quality of the prepared glass filament, the preferred length of the glass filament is 55-155 mm.

[0069] In some embodiments, the thermal reduction method is as follows: the atmosphere is hydrogen, the pressure is 0.03-1 MPa, and the temperature is 480-680°C for 48-800 h.

[0070] Specifically, the aforementioned prepared glass fibers and glass columns are placed in a reduction furnace, hydrogen gas is introduced into the furnace, and the mixture is heated to a thermal reduction temperature for blackening treatment. Preferably, the pressure inside the reduction furnace is 0.03–1 MPa, and the thermal reduction temperature is 480–680°C. As hydrogen atoms are continuously replaced, the surface of the glass fibers and glass columns begins to blacken, forming an absorption layer. The thickness of the absorption layer increases over time. Preferably, the thermal reduction time is 48 to 800 hours. If the thermal reduction time is too short, the thickness of the formed absorption ring 32 will be thinner, resulting in higher light transmittance. This invention preferably uses a blackening time ≥48 hours, thereby ensuring that the glass substrate cover material 3 of this invention has a strong light-blocking effect, preventing crosstalk of optical fibers. If the thermal reduction time is too long, the rate of increase in the thickness of the glass absorption layer slows down, reducing the cost-effectiveness. To improve production efficiency and ensure that the production process is within the optimal cost-effectiveness range, this invention preferably uses a blackening time ≤800 hours.

[0071] In some embodiments, the glass blank is made into a thin sheet, and the thin sheet is chemically strengthened to obtain glass-based cover plate material 3; the chemical strengthening method is: the thin sheet is placed in a 100% KNO3 solution and strengthened at 380-420°C for 6-10 hours.

[0072] Specifically, chemical strengthening can improve the mechanical strength of the glass-based cover material 3. By placing the polished sheet in a saturated potassium nitrate solution, i.e., a chemical strengthening solution, and maintaining it at a temperature of 380–420°C for 6–10 hours, a compressive stress layer is formed on the surface of the cover material through ion exchange, thereby increasing the thermal stability and mechanical strength of the cover.

[0073] In some embodiments, the glass composition, by mass percentage, includes: SiO2: 65-75%; B2O3: 8-15%; Na2O: 5-10%; Al2O3: 2-6%; Li2O: 2-6%; BaO: 0-2%; CaO: 0-2%; and Sb2O3: 0.2-0.7%.

[0074] Specifically, the aforementioned glass can undergo thermal reduction and chemical strengthening, and possesses high mechanical strength. The glass has high transmittance, and the absorption layer formed after thermal reduction exhibits good stray light absorption properties. The glass-based cover material 3 prepared using the aforementioned glass possesses both high transmittance and high crosstalk resistance, is free of Pb and As, is safe and environmentally friendly, and is easy to process, thus making it more suitable for practical use. The average coefficient of thermal expansion of the aforementioned glass at 25–300℃ is 50–60 × 10⁻⁶. -7The glass has a softening point of 620–660℃ and a refractive index of 1.48–1.51. When the glass thickness is 0.5 mm, the transmittance at 350–1000 nm is ≥92%. Thermal reduction of the glass blackens its surface, forming an absorption layer. When the absorption layer thickness is 0.5 mm, the transmittance at 350–1000 nm is <7%. Adding 0.2–0.7% Sb₂O₃ as a clarifying agent can reduce the formation of secondary bubbles in the glass and improve its mechanical strength.

[0075] Preferably, in some embodiments, the glass composition, by mass percentage, includes: SiO2: 65-70%; Na2O: 7-10%; Al2O3: 2-4%; Li2O: 4-6%; BaO: 1-2%; CaO: 1-2%; and (Na2O+Li2O) / (SiO2+Al2O3) = 0.15-0.22, preferably 0.2-0.22. Within this preferred range, the absorption layer formed by the thermal reduction of the glass has lower transmittance.

[0076] The present invention also proposes a glass-based cover material 3, such as Figures 4-6 As shown, it includes: a glass substrate 31; and an absorption ring 32, the absorption ring 32 being embedded in the glass substrate 31 through the upper and lower surfaces of the glass substrate 31 with its axis perpendicular to the surface of the substrate; the absorption ring 32 is obtained by thermal reduction of a material similar to the glass substrate 31; when the thickness of the glass substrate is 0.5 mm, the transmittance of 350-1000 nm is ≥92%; when the thickness of the absorption ring is 0.5 mm, the transmittance of 350-1000 nm is <7%.

[0077] The glass-based cover material 3 proposed in this invention has both high transmittance and high anti-crosstalk performance. It can form several optical paths inside the cover material, thereby reducing scattering and energy loss during light propagation and increasing the propagation distance of light within the glass-based cover material 3. At the same time, it also has high mechanical strength. Tests using a 50g steel ball method show that when the thickness of the glass-based cover material 3 is 0.6-1.0mm, it can withstand a 50g steel ball falling freely from 15cm without breakage. Furthermore, under more optimized process conditions, it can withstand a 50g steel ball falling freely from 25cm without breakage.

[0078] This invention also proposes a smart wearable device comprising the aforementioned glass-based cover material 3. The glass-based cover material 3 of this invention can be applied to smart wearable devices to position electrodes on an outer glass substrate, enabling the optical sensor subsystem to emit and receive light. The light can be emitted into and reflected from the user's skin to determine certain biological parameters of the user, such as heart rate, blood pressure, pulse, blood oxygen, and glucose levels.

[0079] The present invention will be further described below with reference to specific embodiments, but this should not be construed as a limitation on the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention still fall within the scope of protection of the present invention.

[0080] Unless otherwise specified, all materials and reagents mentioned below are commercially available products well known to those skilled in the art; unless otherwise specified, all methods described are methods known in the art. Unless otherwise defined, the technical or scientific terms used should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0081] Example 1:

[0082] This embodiment prepares a glass-based cover plate material 3 containing a ring-shaped structural component, such as... Figure 4 As shown, it includes a glass substrate 31 and an absorption ring 32 disposed on the glass substrate 31. The specific preparation steps are as follows:

[0083] (1) Unperforated glass columns and glass wires were prepared using glass; the outer diameter of the glass column was Φ35mm, the outer diameter of the glass wire was Φ8.4mm±0.05mm, and the length was 120mm; the composition of the glass, by mass percentage, was as follows: SiO2 content was 70%; B2O3 content was 12.5%; Na2O content was 7%; Al2O3 content was 2%; BaO content was 2%; CaO content was 2%; Li2O content was 4%; and Sb2O3 content was 0.5%.

[0084] (2) According to the position and dimensions in the design drawing, drill through holes along the axis on the un-drilled glass column to obtain a glass column with one through hole; the drilling depth is 100mm, and the diameter of the through hole is Φ8.5±0.05mm. There is one through hole, and the through hole is located at the exact center of the glass column.

[0085] (3) Place the glass column and glass wire into a reduction furnace. The atmosphere is hydrogen and the pressure is 0.2 MPa. Raise the temperature to 560℃ for thermal reduction. The thermal reduction time is 300 h to obtain blackened glass wire 1 and blackened glass column 2.

[0086] (4) The blackened glass wire 1 obtained in step (3) is nested into the through hole of the blackened glass column 2. The assembly is put into a special hot pressing mold and placed in a vacuum furnace for vacuum melting and pressing. The vacuum degree is 0.02MPa, the melting and pressing temperature is 680℃, the melting and pressing time is 38min, and the compression ratio is 0.89. After melting and pressing, the glass blank is demolded to obtain the glass blank.

[0087] (5) The glass blank is cut, rolled, sliced, ground, finely carved and polished to obtain a circular sheet with an outer diameter of Φ24mm and a thickness of 1.1mm. The sheet is then placed in a saturated potassium nitrate solution for chemical strengthening at a strengthening temperature of 420℃ for 10h to obtain glass base cover material 3.

[0088] In the glass-based cover material 3 prepared in this embodiment, the wall thickness of the absorption ring 32 is 0.9 mm, and its light transmittance for 350-1000 nm light is <4%. The drop ball test shows that the cover material is undamaged when a 50g steel ball is dropped freely from 25cm.

[0089] Example 2:

[0090] This embodiment prepares a glass-based cover plate material 3 comprising four annular structural components, as shown in the attached figure. Figure 5 As shown, it includes a glass substrate 31 and four absorption rings 32 disposed on the glass substrate 31. The specific preparation steps are the same as in Example 1, except that:

[0091] (1) The outer diameter of the un-drilled glass column is Φ40mm; the outer diameter of the glass wire is Φ14.9mm±0.05mm and the length is 110mm.

[0092] (2) The drilling depth is 100mm, and the diameter of the through hole is Φ15mm±0.05mm. There are 4 through holes, and their distribution is shown in the attached figure. Figure 6 As shown.

[0093] (3) Increase the temperature to 520℃ for thermal reduction, and the thermal reduction time is 100h.

[0094] (4) The vacuum degree of the melting and pressing is 0.04MPa, the melting and pressing temperature is 700℃, the melting and pressing time is 55min, and the compression ratio is 0.83.

[0095] (5) A circular sheet with an outer diameter of Φ30mm and a thickness of 0.8mm was obtained. The strengthening temperature was 410℃ and the strengthening time was 6h.

[0096] In the glass-based cover material 3 prepared in this embodiment, the wall thickness of the absorption ring 32 is 0.7 mm, and its light transmittance for 350-1000 nm light is <5%. The drop ball test shows that the cover material is undamaged when a 50g steel ball is dropped freely from 20cm.

[0097] Example 3:

[0098] This embodiment prepares a glass-based cover plate material 3 comprising four annular structural components, as shown in the attached figure. Figure 6As shown, it includes a glass substrate 31 and nine absorption rings 32 disposed on the glass substrate 31. The specific preparation steps are the same as in Example 1, except that:

[0099] (1) The outer diameter of the un-drilled glass column is Φ50mm; the outer diameter of the glass wire is 14.9mm±0.05mm and 8.9mm±0.05mm, and the length is 105mm.

[0100] (2) The drilling depth is 100mm, and the diameter of the through holes is 15.0mm±0.05mm and 9.0mm±0.05mm. There are 9 through holes, and their distribution is shown in the attached figure. Figure 6 As shown.

[0101] (3) Increase the temperature to 580℃ for thermal reduction, and the thermal reduction time is 48h.

[0102] (4) The vacuum degree of the melting and pressing is 0.04MPa, the melting and pressing temperature is 700℃, the melting and pressing time is 55min, and the compression ratio is 0.90.

[0103] (5) A circular sheet with an outer diameter of Φ40mm and a thickness of 0.6mm was obtained. The strengthening temperature was 400℃ and the strengthening time was 6h.

[0104] In the glass-based cover material 3 prepared in this embodiment, the wall thickness of the absorption ring 32 is 0.5 mm, and its light transmittance for 350-1000 nm light is <7%. The drop ball test shows that the cover material is undamaged when a 50g steel ball is dropped freely from 15cm.

[0105] Example 4:

[0106] The difference from Example 1 is that, by mass percentage, the glass composition is as follows: SiO2 content is 69.3%; B2O3 content is 8%; Na2O content is 10%; Al2O3 content is 4%; Li2O content is 5%; BaO content is 1.5%; CaO content is 1.5%; and Sb2O3 content is 0.7%.

[0107] In the glass-based cover material 3 prepared in this embodiment, the wall thickness of the absorption ring 32 is 1.1 mm, and its light transmittance for 350-1000 nm light is <3.5%. The drop ball test shows that the cover material is undamaged when a 50g steel ball is dropped freely from 25cm.

[0108] Example 5:

[0109] The difference from Example 1 is that, by mass percentage, the glass composition is as follows: SiO2 content is 65.5%; B2O3 content is 15%; Na2O content is 9%; Al2O3 content is 2%; Li2O content is 6%; BaO content is 1%; CaO content is 1%; and Sb2O3 content is 0.5%.

[0110] In the glass-based cover material 3 prepared in this embodiment, the wall thickness of the absorption ring 32 is 1.1 mm, and its light transmittance for 350-1000 nm light is <3.7%. The drop ball test shows that the cover material is undamaged when a 50g steel ball is dropped freely from 25cm.

[0111] Example 6:

[0112] The difference from Example 1 is that, by mass percentage, the glass composition is as follows: SiO2 content is 75%; B2O3 content is 11.8%; Na2O content is 5%; Al2O3 content is 6%; Li2O content is 2%; and Sb2O3 content is 0.2%.

[0113] In the glass-based cover material 3 prepared in this embodiment, the wall thickness of the absorption ring 32 is 1.1 mm, and its light transmittance for 350-1000 nm light is <5.5%. The test with a 50g steel ball shows that the cover material is undamaged when a 50g steel ball is dropped freely from 25cm.

[0114] The technical features in the claims and / or specification of this invention can be combined, and the combination is not limited to the combinations obtained through reference in the claims. Technical solutions obtained by combining the technical features in the claims and / or specification are also within the scope of protection of this invention.

[0115] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a glass-based cover material, characterized in that, It includes the following steps: (1) A glass column and a glass filament are prepared using glass; the glass column has at least one through hole in its axial direction; the diameter of the glass filament is smaller than the inner diameter of the through hole; (2) The glass column and the glass filament are thermally reduced to blacken their surfaces and form an absorption layer, resulting in blackened glass column and blackened glass filament. (3) The blackened glass wire is nested into the through hole of the blackened glass column and vacuum-pressed to obtain a glass blank; (4) The glass blank is made into a glass base cover material.

2. The preparation method according to claim 1, characterized in that, The thermal reduction method is as follows: the atmosphere is hydrogen, the pressure is 0.03-1 MPa, and the temperature is 480-680℃ for 48-800 h.

3. The preparation method according to claim 1, characterized in that, The glass preform is made into a thin sheet, which is then placed in a 100% KNO3 solution and chemically strengthened at 380–420°C for 6–10 hours to obtain the glass-based cover plate material.

4. The preparation method according to claim 1, characterized in that, The glass comprises, by weight percentage: SiO2: 65-75%; B2O3: 8-15%; Na2O: 5-10%; Al2O3: 2-6%; Li2O: 2-6%; BaO: 0-2%; CaO: 0–2%; and, Sb₂O₃: 0.2–0.7%.

5. The preparation method according to claim 4, characterized in that, SiO2: 65-70%; Na2O: 7-10%; Al2O3: 2-4%; Li2O: 4-6%; BaO: 1-2%; and, CaO: 1-2%.

6. The preparation method according to claim 5, characterized in that, (Na2O+Li2O) / (SiO2+Al2O3)=0.15~0.

22.

7. A glass-based cover material, characterized in that, include: Glass substrate; as well as, An absorption ring is embedded in the glass substrate, extending through the upper and lower surfaces of the glass substrate with its axis perpendicular to the surface of the substrate. The absorption ring is obtained by thermal reduction of the glass substrate material; When the thickness of the glass substrate is 0.5 mm, the transmittance in the 350–1000 nm range is ≥92%; when the thickness of the absorption ring is 0.5 mm, the transmittance in the 350–1000 nm range is <7%.

8. A smart wearable device, characterized in that, Includes the glass-based cover material as described in claim 7.

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