High-scratch-resistance chemically strengthened glass as well as preparation method and application thereof

Abstract

The invention relates to the technical field of glass, and discloses high-scratch-resistance chemically strengthened glass as well as a preparation method and application thereof, and the high-scratch-resistance chemically strengthened glass is prepared from the following components: 50.0 to 65.0 weight percent of SiO2, 15.0 to 30.0 weight percent of Al2O3, 10.0 to 15.0 weight percent of Na2O, 0 to 8.0 weight percent of K2O, 0 to 8.0 weight percent of MgO and 2.0 to 10.0 weight percent of P2O5. The content of Al2O3, P2O5 and K2O is 21 to 40 weight percent. Compared with the prior art, the material formula has the advantages that by regulating and controlling the contents of Al2O3, K2O and P2O5, the strengthening efficiency is improved by 50% or above, the prepared glass is excellent in scratch resistance, the minimum scratch width under the load of 2.3 kg is 20 microns, and the surface stress layer depth reaches 52 microns and is far superior to that of the existing high-aluminum glass.

Description

Technical Field

[0001] The invention relates to the technical field of glass, and in particular to a highly scratch-resistant chemically strengthened glass and a preparation method and application thereof. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] Chemically strengthened glass is widely used in electronic products, automobiles, construction and other fields due to its high strength and wear resistance. Common types of chemically strengthened glass include primary strengthened glass, secondary strengthened glass and microcrystalline glass. Primary strengthened glass such as soda-lime glass, medium aluminum glass and high aluminum glass, the strengthening principle is that the glass is placed in potassium salt, the Na in the glass + With potassium salt K + Ion exchange, Na + The radius is K + The radius is Due to the difference in ion radius, a "crowding" effect occurs in the glass structure, forming a compressive stress layer of 10 to 45 μm on the glass surface. However, the surface stress of soda-lime glass is generally between 400 and 800 MPa, and its impact resistance and scratch resistance are relatively poor. With the increasing requirements for glass performance, soda-lime glass can no longer meet the demand. Secondary strengthened glass, such as lithium aluminum silicate glass, is strengthened in the first step by immersing the glass in a molten salt with a NaNO3 content higher than 50%, mainly replacing the Li+ on the glass surface with the Na+ in the molten salt. Due to the Na+ radius Larger than Li+ radius The "crowding" effect is generated on the glass surface to form surface compressive stress. The exchange efficiency is high, and a stress layer of about 100μm is obtained to achieve an enhanced effect. In the second step, the glass is immersed in a molten salt with a KNO3 content of more than 90%, mainly replacing the Na+ on the glass surface with K+ in the molten salt. Larger than Na+ radius The "crowding" effect is generated on the glass surface to form surface compressive stress. After the two steps are completed, a composite compressive stress layer is formed on the glass surface. Microcrystalline glass can be strengthened once or twice.

[0004] Lithium silicate glass and glass-ceramics are mainly used in mid-to-high-end mobile phone covers. High-aluminum silicate glass has a surface stress of 700-900 MPa and has good impact resistance and scratch resistance. It is now widely used. High-aluminum silicate glass is a compromise in terms of cost and performance, but consumers hope that it can be further optimized in terms of performance, cost, processing, etc., so that high-aluminum silicate glass can be more widely used in mobile phones, computers, tablets, wearables, smart homes, car covers and other fields.

[0005] Starting from the glass material, the present invention explores different calculation and production methods to improve the strength performance and scratch resistance while improving the ion exchange efficiency, so that the strengthening efficiency is increased by more than 50% compared with the existing high-aluminum glass, and the processing cost is greatly reduced. Summary of the invention

[0006] The purpose of the present invention is to provide a highly scratch-resistant chemically strengthened glass and a preparation method and application thereof in response to the deficiencies in the current prior art, thereby solving the problems of low strengthening efficiency and high strengthening cost of the prior art glass, and preparing strengthened glass with higher strength performance and higher scratch resistance. The strengthening efficiency is increased by more than 50% compared with the existing high-aluminum glass, the processing cost is greatly reduced, and it has a wider range of application scenarios.

[0007] The technical solution of the present invention is as follows:

[0008] On the one hand, the present invention provides a highly scratch-resistant chemically strengthened glass, comprising the following components: SiO2 content of 50.0-65.0wt%, Al2O3 content of 15.0-30.0wt%, Na2O content of 10.0-15.0wt%, K2O content of 0-8.0wt%, MgO content of 0-8.0wt%, and P2O5 content of 2.0-10.0wt%.

[0009] Preferably, the SiO2 content is 54.0-63.0wt%, the Al2O3 content is 17.0-28.0wt%, the Na2O content is 11.0-14.0wt%, the K2O content is 1.0-5.0wt%, the MgO content is 0-5.0wt%, and the P2O5 content is 2.0-8.0wt%.

[0010] Further preferably, the SiO2 content is 56.0-62.0wt%, the Al2O3 content is 19.0-23.0wt%, the Na2O content is 11.2-13.5wt%, the K2O content is 1.8-3.0wt%, the MgO content is 0-3.0wt%, and the P2O5 content is 3.0-5.5wt%.

[0011] According to a preferred embodiment, the content of Al2O3+P2O5+K2O is 21-40wt%, preferably 25-39wt%.

[0012] Another aspect of the present invention provides a method for preparing highly scratch-resistant chemically strengthened glass, comprising the following steps:

[0013] Step (1): mixing the components according to the ratio as described above, and placing the mixed raw materials in a mixer and mixing them evenly;

[0014] Step (2): pouring the mixed raw materials into a platinum crucible and placing it in a high-temperature furnace for melting;

[0015] Step (3): pouring the molten glass into a metal mold, placing the glass into an annealing furnace for precision annealing and cooling, the annealing temperature is 500°C, the heat preservation time is 60 minutes at this temperature, and then naturally cooling to 100°C;

[0016] Step (4): Slice and polish the cooled glass block to obtain a transparent flat plate original glass with a size of 155.6×73.6×0.6 mm;

[0017] Step (5): The original glass plate is then edge-grinded by a CNC (computer numerical control) machine commonly used in the art to produce a sample of 155×73×0.6 mm, and the edge is then inspected by a microscope to ensure that the edge chipping size is no greater than 35 μm;

[0018] Step (6): insert the glass sample into the tempering rack, and then put it into the preheating furnace for preheating. The preheating starts from room temperature and rises to 380° C. within 30 minutes. The preheating is completed by keeping the temperature for 30 minutes.

[0019] Step (7): Then put the sample into a molten potassium salt for chemical strengthening at a temperature of 400-420°C for 2-6 hours. After strengthening, transfer it to a preheating furnace at 380°C, turn off the preheating furnace heating power, and naturally cool the sample to below 100°C in the furnace before taking it out. After the sample cools to room temperature, wash and dry it;

[0020] According to a preferred embodiment, the potassium salt is chemically strengthened in a molten solution of pure KNO3. The service life of the strengthened salt is longer.

[0021] On the other hand, the present invention provides the application of the aforementioned highly scratch-resistant chemically strengthened glass in the fields of mobile phones, computers, tablets, wearables, smart homes, vehicle covers, front and rear windshields, side windows, skylights, rearview mirrors, laser radars, etc.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. A highly scratch-resistant chemically strengthened glass and a preparation method thereof. The present invention improves the strengthening efficiency by more than 50% compared with the prior art by regulating the contents of Al2O3, K2O and P2O5 in the glass material, even with a short-time strengthening of 3 hours; the prepared glass has excellent scratch resistance, with a scratch width of at least 20 μm at a load of 2.3 kg and a surface stress layer depth of 52 μm, which is much better than the existing high-aluminum glass. DETAILED DESCRIPTION

[0024] The specific embodiments listed in the present invention are only examples of the present invention, and the present invention is not limited to the specific embodiments described below. For those skilled in the art, any equivalent modifications and substitutions to the embodiments described below are also within the scope of the present invention. Therefore, the equal transformations and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the manufacturers are not specified for all reagents or instruments, they are all conventional products that can be purchased commercially. In order to better illustrate the present invention, numerous specific details are given in the specific embodiments below. It should be understood by those skilled in the art that the present invention can also be implemented without certain specific details. In other embodiments, the methods, means, equipment and steps well known to those skilled in the art are not described in detail in order to highlight the purport of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art. Unless otherwise specified, the units used in this specification are all international standard units, and the numerical values ​​and numerical ranges appearing in the present invention should be understood to include the inevitable systematic errors in industrial production.

[0026] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0027] Example 1 A method for preparing highly scratch-resistant chemically strengthened glass

[0028] The steps include:

[0029] Step (1): Proportion the components according to the proportions in Table 1, and mix the mixed raw materials in a mixer evenly;

[0030] Step (2): pouring the mixed raw materials into a platinum crucible and placing it in a high-temperature furnace for melting;

[0031] Step (3): pouring the molten glass into a metal mold, placing the glass into an annealing furnace for precision annealing and cooling, the annealing temperature is 500°C, the heat preservation time is 60 minutes at this temperature, and then naturally cooling to 100°C;

[0032] Step (4): Slice and polish the cooled glass block to obtain a transparent flat plate original glass with a size of 155.6×73.6×0.6 mm;

[0033] Step (5): The original glass plate is then edge-grinded by a CNC (computer numerical control) machine commonly used in the art to produce a sample of 155×73×0.6 mm, and the edge is then inspected by a microscope to ensure that the edge chipping size is no greater than 35 μm;

[0034] Step (6): insert the glass sample into the tempering rack, and then put it into the preheating furnace for preheating. The preheating starts from room temperature and rises to 380° C. within 30 minutes. The preheating is completed by keeping the temperature for 30 minutes.

[0035] Step (7): Place the sample in a 420°C pure KNO3 melt for chemical strengthening for 3 hours. After strengthening, transfer it to a preheating furnace at 380°C, turn off the preheating furnace heating power, and naturally cool the sample to below 100°C in the furnace before taking it out. After the sample cools to room temperature, wash and dry it;

[0036] Step (8): After the glass is prepared, performance test is performed.

[0037] Except for the difference in the proportion of ingredients between Examples 2 to 13 and Comparative Examples 1 to 5 and Example 1, the steps of batching, melting, strengthening, etc. in Steps 1 to 8 are the same.

[0038] The components of Examples 1 to 13 and Comparative Examples 1 to 5 are shown in Table 1 below:

[0039]

[0040] It can be seen from Table 1 that the glass plates of various components shown in Examples 1 to 13 of the present invention have better surface stress layer thickness DOL and scratch resistance than the comparative examples.

[0041] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A highly scratch-resistant chemically strengthened glass, characterized in that: It includes the following components: SiO2 content is 50.0-65.0wt%, Al2O3 content is 15.0-30.0wt%, Na2O content is 10.0-15.0wt%, K2O content is 0-8.0wt%, MgO content is 0-8.0wt%, P2O5 content is 2.0-10.0wt%; the Al2O3+P2O5+K2O content is 21-40wt%.

2. The highly scratch-resistant chemically strengthened glass according to claim 1, characterized in that: The content of Al2O3+P2O5+K2O is 25-39wt%.

3. The highly scratch-resistant chemically strengthened glass according to claim 2, characterized in that: The SiO2 content is 54.0-63.0wt%, the Al2O3 content is 17.0-28.0wt%, the Na2O content is 11.0-14.0wt%, the K2O content is 1.0-5.0wt%, the MgO content is 0-5.0wt%, and the P2O5 content is 2.0-8.0wt%.

4. The highly scratch-resistant chemically strengthened glass according to claim 3, characterized in that: The SiO2 content is 56.0-62.0wt%, the Al2O3 content is 19.0-23.0wt%, the Na2O content is 11.2-13.5wt%, the K2O content is 1.8-3.0wt%, the MgO content is 0-3.0wt%, and the P2O5 content is 3.0-5.5wt%.

5. A method for preparing highly scratch-resistant chemically strengthened glass, characterized in that: The steps include: Step (1): mixing the ingredients according to the ratio of any one of claims 1 to 4, and charging the mixed raw materials into a mixer and mixing them evenly; Step (2): pouring the mixed raw materials into a platinum crucible and placing it in a high-temperature furnace for melting; Step (3): pouring the molten glass into a metal mold, placing the glass into an annealing furnace for precision annealing and cooling, and then cooling naturally; Step (4): Slicing and polishing the cooled glass block to obtain a transparent flat plate of original glass; Step (5): The original glass plate is then edge-grinded by CNC to form a sample of 155×73×0.6 mm, and the edge is then inspected by a microscope to ensure that the edge chipping size is no greater than 35 μm; Step (6): inserting the glass sample into a tempered rack and then placing it into a preheating furnace for preheating; Step (7): the sample is then placed in a molten potassium salt solution for chemical strengthening at a strengthening temperature of 400 to 420° C. for a strengthening time of 2 to 6 hours. After the strengthening is completed, the sample is transferred to a preheating furnace at a temperature of 380° C., the heating power of the preheating furnace is turned off, and the sample is naturally cooled and annealed in the furnace to below 100° C., then taken out, and the sample is washed and dried after cooling to room temperature.

6. The method for preparing highly scratch-resistant chemically strengthened glass according to claim 5, characterized in that: The strengthening temperature is 420° C. and the strengthening time is 3 h.

7. The method for preparing highly scratch-resistant chemically strengthened glass according to claim 5, characterized in that: The potassium salt is pure KNO3.

8. Application of the highly scratch-resistant chemically strengthened glass according to any one of claims 1 to 4 in the fields of mobile phones, computers, tablets, wearables, smart homes, vehicle covers, front and rear windshields, side windows, canopies, rearview mirrors, laser radars, etc.

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