Physical tempered mirror glass cover plate and manufacturing method thereof

Abstract

The embodiment of the invention provides a physically tempered mirror glass cover plate and a manufacturing method thereof. The method comprises the following steps: coating the surface of one side of a glass substrate with a titanium target material to form a titanium film layer which can resist the high temperature of 750-950 DEG C and is used as a mirror film layer; the glass substrate plated with the titanium film layer is pretreated, rough cutting is conducted according to the preset size, and then finish machining is conducted through CNC to obtain the preset appearance; the pretreated glass substrate is fed into a physical toughening furnace to be subjected to physical toughening treatment to obtain a pressure stress layer, the glass substrate is sequentially subjected to three stages of heating, soaking and quenching air quenching in the physical toughening furnace, and in the heating stage, the target temperature interval of heating ranges from 630 DEG C to 720 DEG C; and carrying out annealing treatment on the tempered glass substrate to eliminate tiny unevenness of internal stress, so as to obtain the mirror glass cover plate. According to the embodiment of the invention, the titanium target material is selected to form the titanium film layer, and the titanium film layer cannot be oxidized during physical toughening treatment, so that an excellent mirror surface effect can be kept, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of mirror glass cover technology, and more particularly to a physically tempered mirror glass cover and its manufacturing method. Background Technology

[0002] With the rapid development of consumer electronics and high-end home appliances, the market has placed higher demands on the appearance and performance of glass covers. Mirrored glass covers are highly favored due to their excellent decorative properties, high light reflectivity, and deep visual effect. Traditional mirrored glass covers are mostly achieved by silver plating or painting the glass surface, but these types of glass covers face challenges in subsequent reinforcement processing.

[0003] The commonly used strengthening processes for glass cover plates mainly fall into two categories: chemical tempering and physical tempering. Chemical tempering (ion exchange) is a common method for improving the strength of glass cover plates, but the treated glass surface may exhibit slight roughness changes or react with the coating layer, affecting the integrity of the mirror effect and reflectivity. More importantly, chemical tempering has limited strengthening effect on thicker glass cover plates (e.g., greater than 1.5mm), resulting in a shallow stress layer and a tendency to generate stress spots, affecting optical uniformity. Physical tempering (air tempering), on the other hand, involves heating the glass to near its softening point and then rapidly cooling it, forming a uniform compressive stress layer on the glass surface and a tensile stress layer internally, thereby improving the overall mechanical strength and impact resistance of the glass. Physically tempered glass cover plates have advantages such as a deep stress layer, high strength, no stress spots, and good optical performance. However, the high-temperature process of physical tempering (usually exceeding 600℃) places extremely high demands on the material and surface condition of the glass cover plate itself. Under such high temperatures, the coating on ordinary coated mirror glass covers is easily oxidized, decomposed, or diffused, leading to damage to the mirror effect, a sharp drop in reflectivity, color changes, and even functional failure. Therefore, existing processes typically involve physical tempering first, followed by forming the mirror coating. However, since tempered glass covers cannot be cut, the process must involve cutting, physical tempering, and finally forming the mirror coating. This results in coating only on a large number of small-area glass substrates, which is not only inefficient and wasteful of target material, but also easily affects coating uniformity. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a physically tempered mirror glass cover and its manufacturing method, which can effectively avoid damage to the mirror film layer during the physical tempering process.

[0005] To address the aforementioned technical problems, the present invention first provides the following technical solution: a method for manufacturing a physically tempered mirror glass cover, comprising the following steps: A titanium film layer capable of withstanding high temperatures of 750℃-950℃ and serving as a mirror film layer is formed by depositing a titanium target on one side of a glass substrate. The glass substrate coated with titanium film is pre-treated, roughly cut to a predetermined size, and then precision machined using CNC to obtain the predetermined shape. The pretreated glass substrate is sent to a physical tempering furnace for physical tempering to obtain a compressive stress layer. The glass substrate undergoes three stages of treatment in the physical tempering furnace: heating, homogenization, and rapid cooling. During the heating stage, the target temperature range is 630℃-720℃. The tempered glass substrate is annealed to eliminate minor unevenness in internal stress, resulting in a mirrored glass cover.

[0006] Furthermore, soda-lime glass with a thickness of 1.8 mm or more is selected as the glass substrate.

[0007] Furthermore, the pretreatment also includes screen printing sintered ink on a predetermined area of ​​the glass cover plate that has obtained a predetermined shape.

[0008] Furthermore, the process parameters for the physical tempering treatment are as follows: Heating stage: The heating rate is controlled at 30-50℃ / minute; Heat equalization stage: heat preservation within the target temperature range for a predetermined time to ensure uniform temperature inside the glass substrate. Rapid cooling and air quenching stage: Clean air is sprayed onto the surface of the glass substrate for rapid and uniform cooling, forming a dense and uniform compressive stress layer on the surface of the glass substrate. The air pressure range is controlled between 5-15 kPa, the cooling rate is greater than 100℃ / second, and the surface compressive stress value of the obtained product is ≥100MPa, and the depth of the compressive stress layer is ≥50μm.

[0009] Furthermore, the predetermined duration is 2-10 minutes.

[0010] Furthermore, during the rapid cooling and quenching stage, a high-pressure, multi-nozzle, symmetrically arranged cooling system is used to spray clean air onto the surface of the glass substrate.

[0011] Furthermore, the method further includes the following steps: The obtained mirror glass cover is subjected to quality inspection, and defective products are rejected. The quality inspection includes testing of surface quality, dimensional accuracy, and tempering strength.

[0012] On the other hand, embodiments of the present invention also provide the following technical solution: a physically tempered mirror glass cover, which is manufactured by the manufacturing method of the physically tempered mirror glass cover as described in any of the above claims.

[0013] After adopting the above technical solution, the embodiments of the present invention have at least the following beneficial effects: The manufacturing method of the physically tempered mirror glass cover provided by the embodiments of the present invention uses a titanium target to deposit a titanium film layer on the surface of a glass substrate, which can withstand high temperatures of 750℃-950℃ and serves as a mirror film layer. Under the high temperature environment of the subsequent physical tempering process, the titanium film layer will not be damaged by oxidation, but will still maintain excellent mirror effect, high reflectivity and excellent mechanical properties. Thus, the titanium film layer can be formed first, and then pre-processed such as cutting and fine machining of the shape can be performed before physical tempering, which helps to ensure the quality of the titanium film layer and reduce costs. Attached Figure Description

[0014] Figure 1 This is a schematic flowchart of an optional embodiment of the manufacturing method of the physically tempered mirror glass cover plate of the present invention.

[0015] Figure 2 This is a cross-sectional structural diagram of the physically tempered mirror glass cover plate of the present invention. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. Moreover, the embodiments and features in the embodiments of the present application can be combined with each other unless otherwise specified.

[0017] like Figures 1-2 As shown, an optional embodiment of the present invention provides a method for manufacturing a physically tempered mirror glass cover, comprising the following steps: Step S1: A titanium film layer 2 is formed on one side of the glass substrate 1 by using a titanium target to deposit a film that can withstand high temperatures of 750℃-950℃ and serves as a mirror film layer. Step S2: The glass substrate 1 coated with titanium film layer 2 is pre-treated, roughly cut according to the predetermined size, and then finely machined by CNC to obtain the predetermined shape. Step S3: The pretreated glass substrate 1 is sent into a physical tempering furnace for physical tempering to obtain the compressive stress layer 3. The glass substrate 1 undergoes three stages of treatment in the physical tempering furnace: heating, homogenization, and rapid cooling. During the heating stage, the target temperature range is 630℃-720℃. Step S4: Anneal the tempered glass substrate 1 to eliminate minor unevenness in internal stress and obtain a mirror glass cover.

[0018] The manufacturing method of physically tempered mirror glass cover provided in this invention involves depositing a titanium film layer 2 on the surface of a glass substrate 1 using a titanium target material. This titanium film layer 2 can withstand high temperatures of 750℃-950℃ and serves as a mirror film layer. Under the high-temperature environment of subsequent physical tempering treatment, the titanium film layer 2 will not be damaged by oxidation or other phenomena, but will still maintain excellent mirror effect, high reflectivity, and excellent mechanical properties. Therefore, the titanium film layer 2 can be formed first, followed by pre-treatment such as cutting and fine machining of the shape, and finally physical tempering. This method helps to ensure the quality of the titanium film layer 2 and reduce costs.

[0019] In the physical tempering process, high temperatures directly act on the glass substrate, not only without damaging the completed mirror film layer, but also further enhancing surface hardness and wear resistance due to the resulting compressive stress layer, thus maintaining the mirror effect for a long time. Compared to chemically tempered mirror glass covers, the mirror glass covers obtained using the method provided in this invention have a deeper stress layer and higher surface compressive stress, exhibiting superior impact resistance, bending resistance, and drop resistance, resulting in extremely high product reliability. Furthermore, physical tempering itself does not introduce optical distortion, and the resulting mirror glass covers possess extremely high reflectivity, excellent optical flatness, and transparency, resulting in a deep and realistic visual effect. Moreover, the physical tempering process does not involve chemical salt baths, making it more environmentally friendly. The method provided in this invention is applicable to the production of glass covers of different thicknesses (especially medium-thick plates), with a wide range of applications, from smart cosmetic mirror display covers, game dance machine mirror display covers, industrial control equipment mirror covers to large home appliance control panels, architectural decorative mirrors, and more.

[0020] In another optional embodiment of the present invention, soda-lime glass with a thickness of 1.8 mm or more is selected as the glass substrate 1. This embodiment uses soda-lime glass with a thickness of 1.8 mm or more as the glass substrate 1, which is more suitable for physical tempering treatment.

[0021] In another optional embodiment of the present invention, the preprocessing further includes: screen printing sintering ink 4 on a predetermined area of ​​the glass cover 1 having a predetermined shape. This embodiment, by screen printing sintering ink 4 on a predetermined area of ​​the glass cover 1 having a predetermined shape, can form a black border at the edge to highlight the central display area according to the application requirements of the glass cover on the display screen.

[0022] In another optional embodiment of the present invention, the process parameters for the physical tempering treatment are as follows: Heating stage: The heating rate is controlled at 30-50℃ / minute; Heat equalization stage: heat preservation within the target temperature range for a predetermined time to ensure uniform temperature inside the glass substrate 1. Rapid cooling and air quenching stage: Clean air is sprayed onto the surface of glass substrate 1 for rapid and uniform cooling, forming a dense and uniform compressive stress layer 3 on the surface of glass substrate 1. The air pressure range is controlled between 5-15 kPa, the cooling rate is greater than 100℃ / second, and the surface compressive stress value of the obtained product is ≥100MPa, and the depth of the compressive stress layer 3 is ≥50μm.

[0023] This embodiment can ensure uniform heating of the glass substrate by setting an appropriate heating rate, thus avoiding deformation caused by thermal stress. The uniform heating stage can make the internal temperature of the glass substrate 1 uniform. The rapid cooling and air quenching stage can effectively form a compressive stress layer 3, thereby obtaining a qualified product with a surface compressive stress value ≥100MPa and a compressive stress layer 3 depth ≥50μm.

[0024] In an optional embodiment of the present invention, the predetermined duration is 2-10 minutes. This embodiment achieves the effect of uniform temperature inside the glass substrate 1 by setting a predetermined duration for the heat equalization stage, and also helps to save energy.

[0025] In an optional embodiment of the present invention, during the rapid cooling and quenching stage, a high-pressure, multi-nozzle, symmetrically arranged cooling system is used to spray clean air onto the surface of the glass substrate. This embodiment, by employing a high-pressure, multi-nozzle, symmetrically arranged cooling system to spray clean air onto the surface of the glass substrate 1, ensures that clean air is sprayed onto all parts of the surface of the glass substrate 1, allowing for simultaneous and uniform cooling of all areas of the surface, thereby forming the compressive stress layer 3 more uniformly.

[0026] In an optional embodiment of the present invention, such as Figure 1 As shown, the method further includes the following steps: Step S5: Perform quality inspection on the obtained glass cover plate and remove defective products. The quality inspection includes testing the surface quality, dimensional accuracy, and tempering strength.

[0027] This embodiment can effectively eliminate defective products and ensure the quality of finished products by conducting quality inspection. The surface quality includes: mirror effect, scratches, pitting, etc., and the tempering strength test includes: impact resistance and bending resistance tests.

[0028] On the other hand, embodiments of the present invention also provide the following technical solution: a physically tempered mirror glass cover, which is manufactured by the manufacturing method of physically tempered mirror glass cover as described in any of the above embodiments.

[0029] The physically tempered mirror glass cover provided in this embodiment of the invention can first form a titanium film layer 2 during manufacturing, then perform pre-treatment such as cutting and fine machining of the shape, and finally perform physical tempering, which helps to ensure the quality of the titanium film layer 2 and reduce costs.

[0030] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many variations under the guidance of the present invention without departing from the inventive spirit and scope of protection of the claims. These variations are all within the scope of protection of the present invention.

Claims

1. A method for manufacturing a physically tempered mirror glass cover, characterized in that, Includes the following steps: A titanium film layer capable of withstanding high temperatures of 750℃-950℃ and serving as a mirror film layer is formed by depositing a titanium target on one side of a glass substrate. The glass substrate coated with titanium film is pre-treated, roughly cut to a predetermined size, and then precision machined using CNC to obtain the predetermined shape. The pretreated glass substrate is sent to a physical tempering furnace for physical tempering to obtain a compressive stress layer. The glass substrate undergoes three stages of treatment in the physical tempering furnace: heating, homogenization, and rapid cooling. During the heating stage, the target temperature range is 630℃-720℃. The tempered glass substrate is annealed to eliminate minor unevenness in internal stress, resulting in a mirrored glass cover.

2. The manufacturing method of the physically tempered mirror glass cover plate as described in claim 1, characterized in that, Soda-lime glass with a thickness of 1.8 mm or more is selected as the glass substrate.

3. The method for manufacturing a physically tempered mirror glass cover as described in claim 1 or 2, characterized in that, The pretreatment also includes screen printing sintering ink on a predetermined area of ​​the glass cover plate to obtain a predetermined shape.

4. The method for manufacturing a physically tempered mirror glass cover as described in claim 1, characterized in that, The process parameters for the physical tempering treatment are as follows: Heating stage: The heating rate is controlled at 30-50℃ / minute; Heat equalization stage: heat preservation within the target temperature range for a predetermined time to ensure uniform temperature inside the glass substrate. Rapid cooling and air quenching stage: Clean air is sprayed onto the surface of the glass substrate for rapid and uniform cooling, forming a dense and uniform compressive stress layer on the surface of the glass substrate. The air pressure range is controlled between 5-15 kPa, the cooling rate is greater than 100℃ / second, and the surface compressive stress value of the obtained product is ≥100MPa, and the depth of the compressive stress layer is ≥50μm.

5. The method for manufacturing a physically tempered mirror glass cover as described in claim 4, characterized in that, The scheduled duration is 2-10 minutes.

6. The method for manufacturing a physically tempered mirror glass cover as described in claim 4, characterized in that, During the rapid cooling and quenching stage, a high-pressure, multi-nozzle, symmetrically arranged cooling system is used to spray clean air onto the surface of the glass substrate.

7. The method for manufacturing a physically tempered mirror glass cover as described in claim 1, characterized in that, The method further includes the following steps: The obtained mirror glass cover is subjected to quality inspection, and defective products are rejected. The quality inspection includes testing of surface quality, dimensional accuracy, and tempering strength.

8. A physically tempered mirror glass cover, characterized in that, The physically tempered mirror glass cover is manufactured using the manufacturing method of physically tempered mirror glass cover as described in claims 1-7.

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