WO2022037334A1 - Tempered glass having high compressive stress and high safety, and processing method therefor - Google Patents

Abstract

Disclosed is a tempered glass having high compressive stress and high safety. The safe stress state of the tempered glass is visually characterized in a non-destructive manner. According to research, the relation between the tensile stress line density CT-LD of the tempered glass and the compressive stress layer depth DOL ₀ of the tempered glass satisfies expressions. The tempered glass surface has sufficient compressive stress, so that the tempered glass has excellent anti-drop performance. Also, the tensile stress of the tempered glass is controlled within a safe range, so that the tempered glass does not experience explosive cracking from a slight impact, and does not self-explode. During an ion exchange process, by controlling the concentration of sodium nitrate of the first and final salt baths and testing the zoom ratio of the tempered glass in a timely manner, the degrees of ion exchange reactions are controlled, so that when compared to common glass, the surface of the obtained tempered glass has high compressive stress, thereby ensuring the impact resistance of the tempered glass.

Description

Tempered glass with high pressure stress and high safety and its processing method technical field

The invention relates to the technical field of glass strengthening, in particular to a strengthened glass with high pressure stress and high safety and a processing method thereof.

Background technique

With the advancement of science and technology and the improvement of people's living standards, small electromechanical products, especially portable electronic products, have been greatly used in daily life, including mobile phones, digital cameras, notebook computers, etc. Due to the portability of the product, accidents often occur that consumers accidentally drop the product during carrying or use, resulting in damage to the product. Because the transfer of the momentum of the object in the drop shock is carried out in a very short time, compared with other forms of shock, the impact force of the product drop is the strongest, which causes the appearance of the small mechanical and electrical products to lose their appearance, the internal working performance is reduced, and even the function of use. main reason for loss. Moreover, as sophisticated high-value products, such electronic products are often expensive, and the invisible losses caused by their damage may even exceed the price of the product itself, such as loss of important data, or even missed business opportunities, and may also cause personal safety issues. Wait. Therefore, when consumers buy such products, they will prefer products with good crashworthiness under the condition that they meet the basic functions. The crashworthiness of products when dropped has become an important feature of product quality and the core competitiveness of products.

At present, the glass used in such electronic products is mainly chemically strengthened glass after chemical strengthening. Chemically strengthened glass is a kind of ion exchange process. In the salt bath, alkali metal ions with large ionic radius replace alkali metal ions with small ionic radius in the glass to generate exchange ion volume difference, and a certain surface layer of glass produces from high to low. Tensile stress hinders and delays the expansion of glass micro-cracks, and achieves the purpose of improving the mechanical strength of glass. The tempered glass treated by the ion exchange process produces compressive stress on the surface and corresponding tensile stress on the inside. Chemically strengthened glass is a stress balancer. If the compressive stress is low, the strength of the obtained strengthened glass is not high, which cannot meet the customer's requirements for high drop resistance when the product is dropped; if the compressive stress is too high, although it can be obtained. Tempered glass, but at the same time will lead to the formation of high tensile stress inside the tempered glass, such tempered glass will have potential safety hazards, explosive cracking or even self-explosion will occur under slight impact, which seriously affects the reliability of the product. It even has a serious impact on the personal safety of customers.

The ordinary high-alumina-silicon and lithium-aluminosilicate glass commonly used in the cover glass industry can be strengthened and toughened by chemical ion exchange, but they are limited by the insufficient intrinsic structural strength of the glass network, and their bifurcation threshold has a limit, which cannot support high tensile strength. Stress line density, when the tensile stress line density greatly exceeds the bifurcation threshold, the glass will bifurcate to form fragments smaller than 1mm, which will splash around when broken, causing safety hazards, and if the display screen of electronic products is broken, fragments smaller than 1mm will be formed , it is difficult to continue to use.

Therefore, how to make tempered glass not only have high pressure stress to meet the requirements of high drop resistance, but also keep its tensile stress within a safe range, how to intuitively characterize the stress state of tempered glass in a non-destructive way, and how to obtain Such tempered glass is an urgent technical problem to be solved by those skilled in the current technical field.

SUMMARY OF THE INVENTION

In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a tempered glass with high pressure stress and high safety, and to intuitively characterize the safety stress state of the tempered glass in a non-destructive manner.

The present invention also provides a method for processing the high-pressure stress and high-safety tempered glass, so as to solve the problem that the existing processing methods cannot take both high-pressure stress and high intrinsic strength into consideration.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

The tempered glass with high pressure stress and high safety, the numerical value of the tensile stress linear density CT-LD of the tempered glass and the glass thickness satisfies the following relationship:

CT _av =CT _s -1.28CT _sd ;

Among them, CT-LD is the tensile stress linear density in MPa/mm, CT _av is the arithmetic mean value of the CT area, CT _max is the maximum value of the CT area, DOL ₀ is the depth of the compressive stress layer, and CT _s is the center of the CT area Arithmetic mean of CT between the point and the center point of the tempered glass, CT _sd is the standard deviation of the CT between the center point of the CT area and the center point of the tempered glass; T is the thickness of the glass, in mm.

The present invention also provides a method for processing the strengthened glass with high pressure stress and high safety, comprising the following steps:

S1: preheating the glass substrate;

S2: put the glass substrate preheated in step S1 into a salt bath, and heat for ion exchange reaction;

S3: Repeat step S2 multiple times to obtain the tempered glass according to the present invention;

Wherein, the salt bath is a mixed salt bath of potassium nitrate and sodium nitrate. During the first ion exchange, the mass fraction of the sodium nitrate is greater than that of Na ₂ O/(Li ₂ O+Na ₂ O in the glass substrate component. +K ₂ O) molar ratio; during the last ion exchange, the mass fraction of sodium nitrate is less than the ratio of K ₂ O/(Li ₂ O+Na ₂ O+K ₂ O) in the glass substrate component molar ratio, the final scaling ratio of the tempered glass is controlled at 1.5-2‰.

The present invention also provides the application of the tempered glass with high pressure stress and high safety, and the tempered glass with high pressure stress and high safety according to the present invention is used for the protection of display cover plates, protective cover plates and other transparent materials of electronic products Screen.

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

1. The present invention intuitively characterizes the safety stress state of the tempered glass in a non-destructive manner. It is found that the mathematical relationship of the present invention is satisfied between multiple parameters of the tempered glass. It is also found that the tempered glass obtained by the preparation method of the present invention, Its surface has a sufficiently high compressive stress, so that it has excellent anti-drop performance, and the mathematical relationship described in the present invention is used to accurately characterize and judge whether the tempered glass is in a safe stress state, that is, When the tempered glass satisfies the mathematical relationship of the present invention, it means that the tensile stress of the tempered glass obtained by processing is controlled within a safe range, and there will be no explosive cracking or self-explosion due to slight impact. .

2. When the present invention explores the ion exchange reaction, it is found that in the ion exchange process, by controlling the concentration of sodium nitrate in the first and last salt baths, the scaling ratio of the tempered glass is detected in time, so as to determine the degree of the ion exchange reaction. Control is carried out to make the obtained tempered glass have high compressive stress on the surface compared with ordinary glass, which ensures the impact resistance of the tempered glass; at the same time, when the compressive stress of the tempered glass is increased, the tensile stress in the tempered glass will also be increased. Controlled within a safe range, the tempered glass can reach the best stress state, so that the characteristics of the tempered glass can be better exerted.

3. In the present invention, when the ion exchange reaction is performed on the glass substrate, the scaling ratio of the strengthened glass obtained after each reaction is detected in real time, so as to control the time of the ion exchange reaction, so that the strengthened glass obtained after the reaction is achieved. The glass reaches the optimal stress state; at the same time, the degree of ion exchange reaction is controlled by the scaling ratio. Compared with the prior art, the degree of ion exchange reaction is controlled by a series of parameters such as temperature, immersion time, and the number of times the glass is immersed in one or more salt baths. The present invention controls the ion exchange reaction more accurately and efficiently. , which can make the obtained tempered glass reach the best stress state.

Description of drawings

FIG. 1 is a schematic diagram of fragmented particles produced by the broken glass of Example 1 after being dropped from a height of 2.0 m.

FIG. 2 is a schematic diagram of the front surface of a consumer electronic terminal according to the present invention.

FIG. 3 is a schematic diagram of a rear surface of a consumer electronic terminal according to the present invention.

detailed description

The present invention will be further described below with reference to the accompanying drawings and embodiments.

The following is an explanation of the relevant special names and related measurement methods of the present invention:

Glass substrate: It is a glass substrate material that has not been strengthened and does not contain crystals.

Tempered glass: It is chemically strengthened glass treated by high temperature ion exchange process. In the high-temperature salt bath, the alkali metal ions with large ionic radius replace the alkali metal ions with small ionic radius in the glass to generate the exchange ion volume difference, and the compressive stress from high to low is generated in the surface layer of the glass substrate, which hinders and delays the glass. The expansion of microcracks achieves the purpose of improving the mechanical strength of the glass.

Surface compressive stress CS: After the glass substrate is chemically strengthened, the alkali metal ions with a smaller surface radius are replaced by alkali metal ions with a larger radius. Due to the crowding effect of the alkali metal ions with a larger radius, the glass surface is compressed. stress.

Surface compressive stress CS ₅₀ : compressive stress 50 microns below the glass surface.

Depth of compressive stress layer DOL ₀ : refers to the depth position within the strengthened glass at which the compressive stress generated from the strengthening process reaches zero.

Tensile stress linear density CT-LD: According to the SLP stress meter test, the ratio of the integral of the tensile stress to the thickness of the glass under its thickness section is obtained. In chemically strengthened glass, the compressive stress and tensile stress are in a balanced relationship, and the SLP-1000 stress meter is more accurate in testing the tensile stress area of the glass. Therefore, the tensile stress integral and the thickness ratio are used to characterize the stress contained in the unit thickness of the glass. Used to characterize the degree of stress in chemically strengthened glass.

CT _av is the arithmetic mean of the CT area.

CT _max is the maximum value of the CT area.

CT _s is the arithmetic mean of CT between the center point of the CT area and the center point of the glass.

CT _sd is the standard deviation of CT between the center point of the CT area and the center point of the glass.

Bifurcation threshold: When the glass is impacted by the tensile stress release test method, the crack is bifurcated by its own stress when the glass is cracked, and the tensile stress linear density value at this time is the bifurcation threshold of the glass.

Threshold of trace band: When the glass is impacted by the method of tensile stress release test, when the glass is cracked, it is caused by its own stress to produce trace band, and the linear density value of tensile stress at this time is the threshold value of trace band of glass.

Scaling ratio: The ratio of the expansion of the tempered glass to the original size.

Tensile stress release test: Vickers diamond drills are used for the strengthened glass and fixed with guide rails to ensure that the drills impact the glass surface vertically. Control the penetration depth of the drill bit so that the failure point extends only two cracks instead of starbursts, so as to avoid the influence of external force on the failure state to the greatest extent. Finally, the tensile stress safety of the glass is judged by observing the failure state of the glass.

Drop test of the whole machine: attach a tempered glass sample to a sample of electronic equipment such as a mobile phone, fall freely from a high place, and drop it to a marble board with sandpaper attached to the surface, and record the height of the broken glass. This height value can be used. Reflecting the strength of the glass, this test method is called the whole machine drop test.

Single rod static pressure strength: refers to the force of the round head rod on the glass when the glass is broken in the single rod static pressure test, which is also called the breaking pressure. The single rod static pressure test here refers to: A circle with a diameter of 40mm is placed on a ring with an inner diameter of 30mm, an outer diameter of 50mm and a semicircular cross-section, and then is pressed down with a round-end rod with a diameter of 10mm at a constant speed of 1mm/s. glass in the ring until the glass shatters. This strength characterizes the deformation resistance of the cover glass, which is very effective for the bending resistance and blunt impact resistance of the glass.

In the present invention, FSM6000 and SLP1000 produced by Orihara Company can measure the surface high pressure stress area and deep low pressure stress area respectively, and use PMC software to fit the stress curve to obtain the corresponding test results. Of course, other stress testers that can measure the surface high pressure stress region and the deep low pressure stress region can also be used.

The present invention provides strengthened glass with high pressure stress and high safety, and the tensile stress linear density CT-LD of the strengthened glass satisfies the following relationship:

CT _av =CT _s -1.28CT _sd ;

Among them, CT-LD is the tensile stress linear density in MPa/mm, CT _av is the arithmetic mean value of the CT area, CT _max is the maximum value of the CT area, DOL ₀ is the depth of the compressive stress layer, and CT _s is the center of the CT area Arithmetic mean of CT between the point and the center point of the tempered glass, CT _sd is the standard deviation of the CT between the center point of the CT area and the center point of the tempered glass; T is the thickness of the glass, in mm.

For stress measurement, FSM6000 and SLP1000 produced by Orihara Company can measure the surface high pressure stress area and deep low pressure stress area respectively, and use PMC software to fit the stress curve to obtain the corresponding test results.

The tensile stress linear density CT-LD of the tempered glass is between the bifurcation threshold and the trace band threshold of the tempered glass. At this time, the tensile stress of the tempered glass is maintained in a safe range, so that the tempered glass will not occur. The self-explosion phenomenon and the compressive stress obtained by the tempered glass can ensure that the tempered glass has excellent impact resistance, so the stress state of the tempered glass is in a safe state.

In one or more embodiments, the strengthened glass of the present invention is obtained through chemical strengthening, and its surface compressive stress CS is 500 MPa or more, 600 MPa or more, 700 MPa or more, 800 MPa or more, 900 MPa or more Large, 1000MPa or more, the maximum is 1200Mpa, so as to ensure the impact resistance of the strengthened glass.

In one or more embodiments, the depth DOL ₀ of the compressive stress layer of the strengthened glass is more than 16% of the thickness of the strengthened glass, which can also be described as DOL ₀ being a fraction of the thickness T of the glass. In one or more embodiments, the strengthened glass compressive stress layer depth DOL ₀ may be equal to or greater than 0.16T, equal to or greater than 0.17T, equal to or greater than 0.18T, equal to or greater than 0.19T, equal to or greater than 0.20T, Equal to or greater than 0.21T, up to 0.22T. In some embodiments, the depth DOL ₀ of the strengthened glass compressive stress layer may be 0.16T～0.18T, 0.17T～0.22T, 0.18T～0.19T, 0.16T～0.21T, 0.19T～0.20T, 0.20T ～0.21T, 0.16T～0.20T, 0.19T～0.21T, 0.16T～0.22T, 0.16T～0.19T, 0.18T～0.21T, 0.17T～0.21T, 0.17T～0.18T, or 0.18T～ 0.22T to ensure the drop resistance of tempered glass.

The present invention detects the tensile stress linear density CT-LD of the tempered glass and its compressive stress layer depth DOL ₀ , which satisfies the above relationship, and the tensile stress linear density CT-LD of the tempered glass is at the bifurcation threshold and trace of the tempered glass. Between band thresholds, this tempered glass has high security. Wherein, the high safety means that the compressive stress of the tempered glass is sufficiently high, so that the drop resistance height of the tempered glass is at least 1.6 m or more, and the tempered glass does not self-explode. Furthermore, even if the tempered glass is broken after being dropped or broken during the tensile stress release experiment, the average size of the vertical projection of more than 70% of the fragmented particles on the two-dimensional drawing is more than 15 mm, so that the formed fragmented particles have an average size of more than 15 mm. Not too small, and the tempered glass can be considered to have high safety in this case.

Furthermore, while the surface compressive stress of the tempered glass satisfies the above conditions, the tensile stress linear density CT-LD of the tempered glass should also be controlled within a certain range, because the compressive stress and tensile stress of the tempered glass after chemical strengthening are Equilibrium relationship, the higher the tensile stress linear density, the higher the tensile stress of the tempered glass, and the higher the compressive stress of the tempered glass. Further, the CT-LD of the tempered glass is controlled between 30,000 and 70,000 MPa/mm, and the tensile stress linear density CT-LD of the tempered glass is between the bifurcation threshold and the trace band threshold of the tempered glass, so that The tensile stress of the strengthened glass is maintained within a safe range, so that the self-explosion phenomenon of the strengthened glass will not occur.

Compared with ordinary tempered glass, the stress state of the tempered glass of the present invention is safer, especially in the application of electronic products, it can not only meet the requirements of such users for the product's anti-drop performance, but also ensure the safety of the product. In the drop test of the whole machine, the height of the tempered glass of the present invention is more than 1.6m, which shows that the tempered glass of the present invention has excellent anti-drop performance, and can be used as a cover plate protection material for electronic products such as mobile phones. Compared with ordinary glass, the tempered glass of the present invention has excellent anti-drop performance and safety, and its internal stress state is optimized, so that it has a wide range of applications, and can be applied to the field of electronic product display protection cover plates, which is extremely developed and applied. prospect.

The present invention also provides a method for processing strengthened glass with high pressure stress and high safety, comprising the steps of:

S1: preheating the glass substrate;

S2: put the glass substrate preheated in step S1 into a salt bath, and heat for ion exchange reaction;

S3: Repeat step S2 multiple times to obtain the tempered glass;

Wherein, the salt bath is a mixed salt bath of potassium nitrate and sodium nitrate. During the first ion exchange, the mass fraction of the sodium nitrate is greater than that of Na ₂ O/(Li ₂ O+Na ₂ O in the glass substrate component. +K ₂ O) molar ratio; during the last ion exchange, the mass fraction of sodium nitrate is less than the ratio of K ₂ O/(Li ₂ O+Na ₂ O+K ₂ O) in the glass substrate component molar ratio, the final scaling ratio of the tempered glass obtained at this time is controlled at 1.5-2‰.

In one or more embodiments, the salt bath includes at least one or more sodium-containing salts, and one or more potassium-containing salts. Preferably, the salt bath includes KNO ₃ and NaNO ₃ , and the contents of KNO ₃ and NaNO ₃ are related to the number of ion exchange reactions, and the compressive stress state of the tempered glass can be adjusted by adjusting the concentration of the salt bath, to the optimum range.

The one or more ion exchange processes used to strengthen the glass substrate may include, and the composition of the one or more salt baths may include more than one larger radius ion (eg, Na ⁺ and K ⁺ ) or a single larger radius ion. large ions. Those skilled in the art will understand that the parameters of the ion exchange process include, but are not limited to, the composition and temperature of the salt bath, the immersion time, the number of times the inner glass layer is immersed in one or more salt baths, the use of multiple salt baths, additional steps (such as annealing, washing).

Depending on the number of times the ion exchange reaction is carried out, the control of the reaction conditions is also different. In the present invention, potassium-sodium and/or sodium-lithium ion exchange is performed on the glass substrate in a mixed salt bath of potassium salt and sodium salt, and potassium-sodium ion exchange is performed on the surface layer of the glass substrate, so that the strengthened glass can obtain sufficient surface compressive stress; at the same time, sodium ions with a smaller ionic radius in the mixed salt bath will ion-exchange with lithium ions deep in the glass substrate, further deepening the ion-exchange depth, thereby forming a deeper compressive stress layer depth and further enhancing the strength of the tempered glass. strength.

In some embodiments, when the number of times of the ion exchange reaction is multiple, the first ion exchange is very important. During the first ion exchange, the glass substrate to be treated is subjected to a preheating process at 300° C. to 400° C., and the preheating time is 10 min to 30 min. The ion exchange salt bath is heated to 390℃～460℃, and the glass substrate is put into the salt bath containing _KNO3 and _NaNO3 for reaction. Wherein, in the salt bath of the first ion exchange, the mass fraction of sodium nitrate is greater than the molar ratio of Na ₂ O/(Li ₂ O+Na ₂ O+K ₂ O) in the glass substrate component, according to the glass substrate The concentration of alkali metal ions Li ₂ O, Na ₂ O, K ₂ O can be calculated, and the range of NaNO ₃ mass fraction can be obtained. The salt bath of the first ion exchange includes more than 4.76% NaNO ₃ and all the ranges and sub-zones therebetween. Range, such as 13.9%~90.1%, 19.8%~80.5%, 21.5%~70.8%, 39.4%~60.9%, 45.4%~50.7%, 31.2%~42.6%, 43.8%~92.5%, 22.7%~85.5% , 35.6% to 77.7%, 44.5% to 69.1%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 99%. At the same time, it is also necessary to control the scaling ratio of the tempered glass, and control the ion exchange reaction time by controlling the scaling ratio, wherein the ratio of the change in the size of the tempered glass after ion exchange to the original size is the scaling ratio. The scaling phenomenon of the strengthened glass in the present invention mainly occurs in the first ion exchange reaction. In the first ion exchange reaction, the size of the strengthened glass is monitored in real time to know whether the specific scaling ratio of the strengthened glass reaches 80% of the total scaling ratio. Above, if it reaches more than 80%, the first ion exchange reaction is completed, which can effectively increase the compressive stress in the deep layer of the tempered glass. During the interval between multiple ion exchanges, a thermal migration process is required. The tempered glass after each ion exchange reaction is taken out from the salt bath and placed at room temperature for 15 to 120 minutes. After the thermal migration process is completed, the next ion exchange process is completed. exchange reaction. In the salt bath of the last ion exchange, the mass fraction of sodium nitrate is less than the molar ratio of K ₂ O/(Li ₂ O+Na ₂ O+K ₂ O) in the glass substrate component, according to the glass substrate The concentration of alkali metal ions Li ₂ O, Na ₂ O, K ₂ O in the material can be calculated, and the range of NaNO ₃ mass fraction can be obtained. The salt bath of the last ion exchange includes less than 37.03% of NaNO ₃ and all between them. Ranges and sub-ranges such as 1% to 13.6%, 2% to 13.1%, 1.6% to 21.7%, 3.1% to 34.6%, 1.8% to 20.6%, 5% to 12.2%, 2.5% to 31.8%, 3.5% to 3.5% 28.6%, 0.8% to 17.5%, 0.4% to 15.8%, 4%, 8%, 3.5%, 18.6%, 4.5%, 28.8%, 14.7%, 7.9%, 24.4%, 32.8%. After the last ion exchange reaction, the final scaling ratio of the strengthened glass is controlled between 1.5‰～2‰, preferably 1.6‰～2‰, 1.6‰～1.7‰, 1.7‰～2‰, 1.8‰～ 2‰, 1.9‰～2‰, 1.5‰～1.6‰, 1.5‰～1.7‰, 1.5‰～1.9‰, 1.6‰～1.8‰, 1.74‰～2.0‰, 1.6‰～1.9‰, 1.65‰～2.0‰ , 1.7‰～1.8‰, 1.7‰～1.9‰, 1.8‰～1.9‰, 1.5‰～1.8‰, 1.85‰～2.0‰, or 1.95‰～2.0‰, so that the stress state of the finally obtained tempered glass is evaluated. control.

In one or more embodiments, multiple batches of glass substrates are chemically strengthened in batches in the same salt bath environment. During the ion exchange reaction, a small amount of impurity ions will be generated in the ion exchange salt bath after chemical strengthening of each batch of glass substrates, mainly lithium ions exchanged from the glass substrate. After the glass substrate is chemically strengthened, the concentration of lithium ions in the ion exchange salt bath will increase. At this time, the concentration of lithium ions must be controlled, because the lithium ions in the ion exchange salt bath will become K ⁺ -Na ⁺ , The hindering ions of Na ⁺ -Li ⁺ ion exchange, and the presence of a small amount of lithium ions will greatly reduce the degree of ion exchange, thereby weakening the strengthening state of the strengthened glass. The molar ratio of the lithium ion concentration in the salt bath to the total alkali metal ions in the salt bath is less than 0.25% and all ranges and sub-ranges therebetween, such as 0.01% to 0.23%, 0.1% to 0.14%, 0.01% to 0.2% , 0.03%～0.15%, 0.04%～0.16%, 0.03%～0.24%, 0.06%～0.25%, 0.05%～0.18%, 0.06%～0.15%, 0.03%～0.12%, 0%, 0.12%, 0.16 %, 0.2%, 0.14%, 0.18%, 0.11%, 0.05%, 0.21%, 0.08%, 0.06%, 0.07%, 0.04%, 0.03%, 0.02%, or 0.01%.

In some embodiments, when the compressive stress on the surface of the non-first-strengthened glass decreases to 5% to 20% of the compressive stress on the surface of the first-strengthened glass, the ion exchange is stopped, and lithium ions are added to the ion-exchange salt bath for purification The material is heated and reacted for a period of time, and the ion exchange is continued. Preferably, 0.1%-2% of the lithium ion purified product is put into the ion-exchange salt bath, the purification temperature is controlled at 360°C to 450°C, and the purification time is consistent with the strengthening time of the tempered glass.

In some embodiments, when the compressive stress on the surface of the non-first-strengthened glass decreases to 10%-20% of the compressive stress on the surface of the first-strengthened glass, the ion exchange is stopped and the glass substrate is removed from the ion-exchange salt bath , and then put the lithium ion purified product with a mass of 1% to 5% of the mass of the ion exchange salt bath into the ion exchange salt bath. . However, if multiple batches of glass substrates are placed in separate salt baths for strengthening, the addition of lithium ion purification is not required.

The lithium ion purified product is an ion sieve material, and the ion sieve material comprises the following components in mass percentage: 15%-55% of SiO ₂ , 5%-50% of auxiliary materials, and at least one of 15%-48% Functional metal oxide, the metal in the functional metal oxide is a monovalent and/or divalent metal, the monovalent metal is at least one of lithium, sodium, potassium, and rubidium, and the divalent metal It is at least one of magnesium, calcium, strontium and barium, the auxiliary material forms polar covalent bonds and ionic bonds with SiO ₂ , and the auxiliary material is selected from phosphorus oxide, boron oxide, aluminum oxide, zirconium oxide, chromium oxide, oxide At least one of iron, zinc oxide, bismuth oxide, and cobalt oxide. The lithium ion purified product used in the present invention can be purchased from the market, and is an RT product produced by Shenzhen Donglihua Technology Co., Ltd. The lithium ion purified product is mainly used to remove Li ⁺ in the ion exchange salt bath, control the concentration of Li ⁺ in the ion exchange salt bath, reduce its influence on the degree of ion exchange of the strengthened glass, and at the same time, it will not be in the ion exchange salt bath. Other impurity ions are introduced into the bath, and the used ion sieve will not pollute the environment. The use of the lithium ion purified product can effectively avoid the deactivation of the ion exchange salt bath, weaken the effect of strengthening the glass, and restore the activity of the ion exchange salt bath.

The present invention also discloses a consumer electronic terminal, comprising a casing including a front surface, a rear surface and a side surface; and an electronic assembly partially located in the casing, the electronic assembly including a display, the display being located in the casing At or adjacent to the front surface of the glass; the front surface or/and the rear surface or/and the side surface comprise the strengthened glass with high pressure stress and high safety according to the present invention.

The consumer electronic terminal includes a mobile phone, a tablet computer, or consumer electronic products thereof. For example, consumer electronics products, including mobile phones, tablet computers, computers, navigation systems, etc., products with displays; construction products, transportation products (such as automobiles, trains, aircraft, marine vehicles, etc.), appliance products, or products that require a certain degree of transparency , scratch resistance, abrasion resistance, or any combination thereof. See Figures 2 and 3 for exemplary articles comprising any of the glass articles disclosed herein. Specifically, FIG. 2 shows a front surface of a consumer electronic device, and FIG. 3 shows a rear surface of the consumer electronic device, which includes a housing including a front surface 1, a rear surface 2 and a side surface; and part of the Electronic components located within or entirely within the housing, and the electronic components include a display, and may also include a controller, memory, and other electronic components, wherein the display is located at or adjacent to the front surface of the housing. The front surface or/and the rear surface or/and the side surface of the housing comprise the tempered glass according to the present invention.

In some embodiments, a cover product 3 is also included, the cover product 3 is covered on the front surface 1 of the casing of the consumer electronic terminal or the cover product is located on the display, and the cover product 3 and/or a part of the casing comprises the invention described in the present invention. Tempered glass. The cover article includes the reinforced glass with high pressure stress and high safety.

In the present invention, in order to obtain a strengthened glass with a safe compressive stress state, certain requirements are also imposed on the material of the glass. Specifically, based on the mole % of oxides, the glass includes the following components:

SiO ₂ : 65mol% to 75mol%, preferably 70mol% to 75mol%;

Al ₂ O ₃ : 8mol%～15mol%;

Wherein, the content of SiO ₂ accounts for at least 78 mol % of the total amount of SiO ₂ and Al ₂ O ₃ , preferably more than 80 mol %.

In the glass material of the present invention, the glass network components are mainly SiO ₂ and Al ₂ O ₃ , both of which can improve the strength of the glass network structure, and the high network structure composition can increase the amount of oxygen in the glass bridges, especially It is to increase the content of silicon components, which can improve the strength of the network structure of the glass. While Al ₂ O ₃ helps to increase the rigidity of the glass network, Al ₂ O ₃ can exist in the glass in a tetra- or penta-coordination, which increases the bulk density of the glass network and thus increases the compressive stress formed by chemical strengthening . High network structure strength plays an important role in the ion exchange of glass, because during the ion exchange process, the glass will undergo K ⁺ -Na ⁺ , Na ⁺ -Li ⁺ binary ion exchange step by step or simultaneously to form a composite compressive stress Floor. However, in this process, the glass will have a stress relaxation effect due to the exchange of ions of different radii, and the high temperature and long reaction time in the ion exchange reaction will weaken the composite compressive stress layer, especially the middle and deep layers. Therefore, improving the network structure strength of the glass can effectively overcome the influence of the above reasons on the composite compressive stress layer. In some embodiments, the glass may include 8-15 mol% Al ₂ O ₃ and all ranges and subranges therebetween, eg, 8-14.5 mol %, 8-14 mol %, 8-13.5 mol % %, 8%～13mol%, 10%～13mol%, 8%～12mol%, 9%～14.5mol%, 9%～14mol%, 9%～11.5mol%, 10%～13mol%, 9mol%, 9.5 mol%, 10mol%, 10.5mol%, 11mol%, 11.2mol%, 12.4mol%, 12.6mol%, 12.8mol%, 13mol%, 13.2mol%, 13.4mol%, 13.6mol%, 13.8mol%, or 15mol% %.

The components of the glass also include B ₂ O ₃ and B ₂ O ₃ as the secondary network structure of the glass. An appropriate amount of B ₂ O ₃ can promote the melting of the glass at high temperature, reduce the difficulty of melting, and can effectively improve the ion exchange in the glass. The rate of increase, especially the exchange capacity of K ⁺ -Na ⁺ is very significant, but excessive B ₂ O ₃ will lead to the weakening of the glass network structure, so it is necessary to control the amount of B ₂ O ₃ added, and the moles of B ₂ O ₃ account for The ratio is controlled within a range of not more than 3 mol%. In some embodiments, the glass may include no more _{than 3} mol% B2O3 and all ranges and subranges therebetween, eg, 0-2.9 mol%, 0-2.7 mol%, 0-2.1 mol%, 0 ～1.7mol%, 0～1.2mol%, 1mol%～2.6mol%, 1mol%～2.0mol%, 1mol%～1.5mol%, 1mol%～1.3mol%, 1mol%～1.9mol%, 0mol%, 1.4 mol%, 1.6mol%, 2.3mol%, 2.5mol%, 2.9mol%, 2.7mol%, 2.4mol%, 2.1mol%, 0.4mol%, 0.7mol%, 0.6mol%, 0.5mol%, 0.3mol% , 0.2 mol%, or 0.1 mol%.

The components of the glass also include Na ₂ O and Li ₂ O. Among them, the molar proportion of Na ₂ O is in the range of 1 mol% to 6 mol%. Na ₂ O is the main component of ion exchange and is the key exchange ^ion to form surface high pressure stress. ⁺ -Na ⁺ exchange enables the glass to obtain a sufficiently high compressive stress through ion exchange, therefore, in some embodiments, the glass may include 1 mol % to 6 mol % Na ₂ O and all ranges and subranges therebetween , such as 1mol%～5mol%, 1mol%～5.6mol%, 1mol%～4mol%, 1mol%～4.7mol%, 1mol%～3mol%, 1mol%～3.5mol%, 2mol%～5.9mol%, 2mol% ～4.7mol%, 2mol%～3.8mol%, 1.5mol%～4mol%, 2.6mol%～4.9mol%, 3.7mol%～5.8mol%, 1mol%, 1.5mol%, 2mol%, 2.8mol%, 2.6 mol %, 2.5 mol %, 2.1 mol %, 3.8 mol %, 3.6 mol %, 4 mol %, 4.4 mol %, 4.3 mol %, 5.2 mol %, or 5.5 mol %.

Li ₂ O is also the main component of ion exchange. The molar proportion of Li ₂ O is in the range of 7 mol% to 12 mol%. The radius of Na ⁺ in the ion exchange salt bath is smaller than that of K ⁺ , which enables it to penetrate deeper into the glass and interact with Li ⁺ For ion exchange, Li ⁺ in the glass is the key exchange ion to form deep compressive stress, and Na ⁺ -Li ⁺ exchange with Na ⁺ in the ion-exchange salt bath enables the glass to form a high-depth compressive stress layer. In some embodiments, the glass may include 7-12 mol% _Li2O and all ranges and subranges therebetween, eg, 7-11 mol%, 7.8-10.7 mol%, 7.5-10 mol% %, 8.6mol%～11.7mol%, 8.2mol%～11.4mol%, 9.1mol%～10.8mol%, 9.2mol%～11.5mol%, 10.2mol%～11.9mol%, 8.5mol%～11.5mol%, 9.5mol%～10mol%, 10.6mol%～11.9mol%, 7.7mol%～9.8mol%, 7.5mol%, 8mol%, 9mol%, 7.8mol%, 8.6mol%, 9.5mol%, 10.1mol%, 11.8 mol %, 7.6 mol %, 10 mol %, 10.4 mol %, 11.3 mol %, 9.2 mol %, or 10.1 mol %.

Since Na ₂ O and Li ₂ O are alkali metal oxides, they are free in the glass, and their excess oxygen ions will disconnect the bridge oxygen, so the molar ratio of Na ₂ O and Li ₂ O needs to be controlled at In the range of 7 mol% to 13 mol%, in some embodiments, the glass may comprise 7 mol% to 13 mol% Na2O _{+ Li2O} and all ranges and subranges therebetween, such as 8 mol% to 13 mol%, 7mol%～12mol%, 8mol%～10.5mol%, 7mol%～10.6mol%, 8mol%～11mol%, 7mol%～10.5mol%, 7mol%～11.5mol%, 9mol%～11mol%, 7mol%～8.9 mol%, 8.6mol%～12.8mol%, 9mol%～12.4mol%, 7mol%～9.8mol%, 7mol%～10.4mol%, 7mol%～10.8mol%, 9mol%, 10mol%, 11.2mol%, 11.4 mol %, 11.6 mol %, 11.8 mol %, 12 mol %, 12.1 mol %, 12.3 mol %, 12.5 mol %, or 13 mol %.

The components of the glass further include K ₂ O, and the molar proportion of K ₂ O is controlled between 0.1 mol % and 3 mol %, and K ₂ O is the main component of ion exchange. In some embodiments, the glass may include 0.1 mol% to ₃ mol% K2O and all ranges and subranges therebetween, eg, 0.2 mol% to 2.8 mol%, 0.1 mol% to 2.6 mol%, 0.3 mol% %～2mol%, 0.4mol%～1.8mol%, 0.5mol%～1.0mol%, 1mol%～2.5mol%, 1mol%～2.0mol%, 1mol%～1.8mol%, 1mol%～1.5mol%, 1mol% %～1.2mol%, 0mol%, 1.5mol%, 1.8mol%, 2mol%, 2.9mol%, 2.8mol%, 2.6mol%, 2.5mol%, 2.1mol%, 0.8mol%, 0.6mol%, 0.5mol% %, 0.4 mol%, 0.3 mol%, 0.2 mol%, or 0.1 mol%.

The components of the glass also include MgO, and the molar proportion of MgO is controlled between 2 mol% and 7.5 mol%. As an intermediate of the glass network structure, MgO has the effect of reducing the high temperature viscosity of the glass, thereby increasing the Young's modulus of the glass. . In some embodiments, the glass may include 2 mol% to 7.5 mol% MgO and all ranges and subranges therebetween, such as 2.5 mol% to 2.8 mol%, 2.5 mol% to 6.6 mol%, 2.6 mol% to 2.6 mol% 5.2mol%, 2.4mol%～3.8mol%, 3.5mol%～4.0mol%, 3mol%～4.5mol%, 2.7mol%～4.8mol%, 3.2mol%～5.0mol%, 3.1mol%～4.5mol% , 4mol%～5mol%, 2.5mol%, 3.5mol%, 3.8mol%, 3mol%, 2.9mol%, 2.8mol%, 2.6mol%, 4.5mol%, 5.1mol%, 5.8mol%, 5.6mol%, 3.2 mol%, 3.4 mol%, 3.3 mol%, 7.2 mol%, or 7.1 mol%.

The composition of the glass also includes chemical fining agents, such fining agents including but not limited to SnO ₂ and sodium chloride. In some embodiments, the glass may include no more than 1 mol% _SnO and sodium chloride and all ranges and subranges therebetween, eg, 0.1 mol% to 0.9 mol%, 0.1 mol% to 0.8 mol%, 0.1 mol% mol%～0.7mol%, 0.1mol%～0.6mol%, 0.1mol%～0.5mol%, 0.1mol%～0.4mol%, 0.5～1.0mol%, 0.05～1.0mol%, 0.03～1.0mol%, 0.02 ~1.0 mol %, 1 mol %, 0.9 mol %, 0.8 mol %, 0.7 mol %, 0.6 mol %, 0.5 mol %, 0.4 mol %, 0.3 mol %, 0.2 mol %, or 0 mol %.

In particular, the glass does not contain phosphorus, nor does it contain other alkaline earth metal elements other than magnesium. That is, phosphorus-containing and other alkaline earth metal elements are not actively added, but may be present as impurities in very small amounts, for example, in the examples, all below 300 ppm or less. Because phosphorus pentoxide in glass can reduce the melting temperature of glass at high temperature, but because phosphorus pentoxide has a phosphorus-oxygen double bond, the structure is unstable, and its scratch resistance is poor, and the phosphorus-containing structure will lead to a decrease in the bifurcation threshold of the glass. , and in float glass, the phosphorus-containing structure will make the glass easy to phase separate and crystallize, which increases the difficulty of production. Magnesium-alkaline earth metals have good high-temperature melting and have little effect on the ion exchange rate, but Ca, Zn, and other alkaline earth metal oxides have a larger ionic radius than magnesium, which has a greater impact on the ion exchange rate.

In this embodiment, the above-mentioned components in the frit are smelted at a temperature between 1630°C and 1700°C, such as 1630°C, 1640°C, 1650°C, 1680°C, 1690°C or 1700°C. Tin oxide and sodium chloride can be selected as clarifying agents, and the molar ratio of the two is not more than 1%, such as 0.1%, 0.2%, 0.5%, 0.6%, 0.7%, 0.8% or 0.9%. And according to its high temperature viscosity and material properties, the glass substrate can be produced by the overflow down-draw method, the float method and the calendering method, and the surface compressive stress of the glass substrate is more than 500MPa.

The processing method of the tempered glass with a safe compressive stress state according to the present invention takes Embodiment 1 as an example:

S1: First accurately weigh according to the ratio of the raw materials of the glass substrate (see Table 1), and then fully mix the raw materials, keep it at a high temperature of 1630 ° C for 4 hours, melt it, and then shape it to obtain a glass substrate with a thickness of 0.7 mm. material.

S2: Preheat the glass substrate obtained in step S1 at 450° C. for 20 min, and then put the glass substrate into a mixed salt bath of 50 wt% NaNO ₃ and 50 wt % KNO ₃ for the first ion exchange Reaction, the reaction temperature is 435 ℃, the scaling ratio of the glass substrate is detected, and the scaling ratio of the glass substrate is 1.6‰, so as to control the reaction time, so that the scaling ratio is controlled above 80% of the total scaling ratio, After the reaction was completed, it was taken out and washed.

S3: put the glass substrate obtained in step S2 into a mixed salt bath of 8 wt% NaNO ₃ and 92 wt % KNO ₃ for the last ion exchange reaction, the reaction temperature is 430°C, and the scaling ratio of the glass substrate is detected. , so that the total scaling ratio of the glass substrate is 2‰, the reaction is completed, and the glass is taken out and washed to obtain the tempered glass.

In the present invention, FSM6000 and SLP1000 produced by Orihara Company can measure the surface high pressure stress area and deep low pressure stress area respectively, and use PMC software to fit the stress curve to obtain the corresponding test results. Of course, other stress testers that can measure the surface high pressure stress region and the deep low pressure stress region can also be used.

The present invention is described below through specific examples and comparative examples, using the recipes of the glass substrates in Table 1, the process parameters for preparing tempered glass in Table 2, and the performance test parameters for the examples and comparative examples in Table 3.

Table 1

Composition and mole percent	Example 1	Example 2	Example 3	Comparative Example 1	Comparative Example 2
SiO2	67	71.5	74	67	63
Al 2 O 3	15	10	8	15	12
B 2 O 3	2	3	1.5	2	2
MgO	3	2.5	1	3	2
ZnO	1	--	--	1	--
ZrO 2	--	0.5	--	--	--
Na 2 O	3.5	2.5	1.5	3.5	11
K 2 O	1	1	2	1	2
Li 2 O	7.5	9	12	7.5	8

Note: "-" indicates that this component is not contained in the glass substrate.

Table 2

Preparation Process	Example 1	Example 2	Example 3	Comparative Example 1	Comparative Example 2
First ion exchange NaNO 3 (wt%)	50	80	100	50	85
First ion exchange KNO 3 (wt%)	50	20	0	50	15
First ion exchange time (h)	7	7	7	4	7
First strengthening temperature (℃)	435	435	460	435	440
Last ion exchange NaNO 3 (wt%)	8	5	3	15	15
Last ion exchange KNO 3 (wt%)	92	95	97	85	85
Last ion exchange time (h)	1	1	1	3	1
The last strengthening temperature (℃)	430	430	440	440	430
First ion exchange scaling ratio (‰)	1.6	1.6	1.7	1.1	0.9
Last ion exchange scaling ratio (‰)	2.0	1.9	1.9	1.6	1

table 3

feature	Example 1	Example 2	Example 3	Comparative Example 1	Comparative Example 2
Tempered glass thickness T(mm)	0.7	0.7	0.7	0.7	0.7
Surface compressive stress (MPa)	768	685	700	475	821
DOL 0 (μm)	130	122	125	120	120
CT-LD(MPa/mm)	43798.9	44802.7	48371.1	42836.5	30000
CT max (MPa)	95	93	102	88	65
CTs	90	90	98	85	55
CT sd	1	0.7	0.8	0.2	1
Bifurcation Threshold (MPa/mm)	45500	48500	52000	45500	38200
Trace band threshold (MPa/mm)	38500	41000	45000	38500	30000
Anti-drop height (m)	1.9	1.9	2.1	1.6	0.8
Single rod static pressure N	421	360	275	285	374

Among them, Comparative Example 1 is an existing sample. Although its bifurcation threshold is high, the scaling ratio of this sample in the first reinforcement accounts for a low proportion of its total scaling ratio, only accounting for 68.75% of the total scaling ratio, which fully shows that In Comparative Example 1, during the first chemical strengthening, the degree of sodium-lithium ion exchange was insufficient, which also resulted in low surface compressive stress and CT-LD of the final sample, and its anti-drop performance was far inferior to that of the present invention.

Comparative example 2 is a product currently on the market. Although the surface compressive stress of the product is high, the product also obtains a high tensile stress, and the CT-LD of the product is not between the bifurcation threshold and the trace band threshold. , but is the same as the threshold of the trace band, which makes the compressive stress and tensile stress of the comparative example 2 not in the best state, so that high safety cannot be obtained, and it also causes the poor anti-drop performance of the comparative example 2. , even worse than Comparative Example 1.

Combining Table 2 and Table 3, the glass substrate of this example is subjected to K ⁺ -Na ⁺ ion exchange in a mixed salt bath of potassium and sodium, and Na ⁺ -Li ⁺ ion exchange is also carried out to form compressive stress, and the glass substrate The material is chemically strengthened to increase the strength of the obtained strengthened glass. After strengthening, the compressive stress on the surface of the strengthened glass is above 600MPa, which ensures the impact resistance of the glass. At the same time, the strengthening time is adjusted by controlling the scaling ratio, so that the performance indexes of the strengthened glass meet the relational expressions of the present invention, so that the strengthened glass has high pressure stress and high safety.

The whole machine drop test was carried out on the tempered glass obtained by the preparation method of Example 1. The mobile phone mold was firmly attached to the sample made of tempered glass in Example 1, and the tempered glass sample was dropped horizontally on the marble plate with sandpaper on the surface. The highest point at which the tempered glass sample is not broken is taken as the anti-drop height. After passing the drop test of the whole machine, the drop resistance height of the tempered glass in Example 1 is 1.9m, indicating that Example 1 has high drop resistance performance.

In the tensile stress release experiment, the broken situation of the tempered glass of Example 1 after being dropped from a height of 2.0 m is shown in Figure 1. The average size of the vertical projection of more than 70% of the broken particles on the two-dimensional drawing is more than 15 mm, and the As for the small fragment particles, it shows that the tensile stress of the tempered glass in Example 1 is within a safe range and will not cause a safety hazard.

It can be seen from Table 3 that the compressive stress and tensile stress of the tempered glass of the present invention are in the best state, the tempered glass has a high network structure strength, and obtains a high surface compressive stress, which effectively improves the The anti-drop height of the tempered glass, and at the same time, the tensile stress of the tempered glass is controlled within a safe range to further increase the limit of the anti-drop strength, thereby ensuring the safety of the tensile stress of the tempered glass.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those of ordinary skill in the art should understand that those technical solutions of the present invention are modified or equivalently replaced without departing from the present technology. The purpose and scope of the solution should be included in the scope of the claims of the present invention.

Claims (23)

1. The tempered glass with high pressure stress and high safety is characterized in that the numerical value of the tensile stress linear density CT-LD of the tempered glass and the glass thickness satisfies the following relational formula:

   

   CT _av =CT _s -1.28CT _sd ;

   Among them, CT-LD is the tensile stress linear density in MPa/mm, CT _av is the arithmetic mean value of the CT area, CT _max is the maximum value of the CT area, DOL ₀ is the depth of the compressive stress layer, and CT _s is the center of the CT area Arithmetic mean of CT between the point and the center point of the tempered glass, CT _sd is the standard deviation of the CT between the center point of the CT area and the center point of the tempered glass; T is the thickness of the glass, in mm.
2. The tempered glass with high pressure stress and high safety according to claim 1, wherein the tensile stress linear density CT-LD of the tempered glass is between the bifurcation threshold and the trace band threshold of the tempered glass.
3. The tempered glass with high pressure stress and high safety according to claim 1, wherein the depth DOL ₀ of the tempered glass compressive stress layer is 16% or more of the thickness T of the tempered glass.
4. The tempered glass with high pressure stress and high safety according to claim 1, wherein the tensile stress linear density CT-LD of the tempered glass is 30000-70000 MPa/mm.
5. The tempered glass with high pressure stress and high safety according to claim 1, characterized in that, the components of the tempered glass include Na ₂ O, Li ₂ O or K ₂ O.
6. The tempered glass with high pressure stress and high safety according to claim 1, wherein the tempered glass does not contain phosphorus.
7. The tempered glass with high pressure stress and high safety according to claim 1, wherein the tempered glass does not contain other alkaline earth metal elements other than magnesium.
8. The processing method of tempered glass with high pressure stress and high safety is characterized in that, it comprises the following steps:

   S1: preheating the glass substrate;

   S2: put the glass substrate preheated in step S1 into a salt bath, and heat for ion exchange reaction;

   S3: repeating step S2 multiple times to obtain the tempered glass according to any one of claims 1 to 7;

   Wherein, the salt bath is a mixed salt bath of potassium nitrate and sodium nitrate. During the first ion exchange, the mass fraction of the sodium nitrate is greater than that of Na ₂ O/(Li ₂ O+Na ₂ O in the glass substrate component. +K ₂ O) molar ratio; during the last ion exchange, the mass fraction of sodium nitrate is less than the ratio of K ₂ O/(Li ₂ O+Na ₂ O+K ₂ O) in the glass substrate component molar ratio, the final scaling ratio of the tempered glass is controlled at 1.5-2‰.
9. The method for processing tempered glass with high pressure stress and high safety according to claim 8, wherein after the first ion exchange, the scaling ratio of the tempered glass accounts for more than 80% of its final scaling ratio.
10. The method for processing strengthened glass with high pressure stress and high safety according to claim 8, wherein the concentration of lithium ions in the salt bath accounts for a molar ratio of total alkali metal ions in the salt bath less than 0.25%.
11. The method for processing strengthened glass with high pressure stress and high safety according to claim 8, wherein the glass substrate component contains Na ₂ O, Li ₂ O or K ₂ O.
12. The method for processing strengthened glass with high pressure stress and high safety according to claim 8, wherein in step S1, the glass substrate is preheated at 300°C to 400°C for 10 to 30 minutes.
13. The method for processing a strengthened glass with high pressure stress and high safety according to claim 8, characterized in that in step S2, the ion exchange reaction temperature is 350°C to 500°C.
14. The method for processing a strengthened glass with high pressure stress and high safety according to claim 8, wherein the ion exchange reaction temperature in step S2 is 390°C to 460°C.
15. The method for processing tempered glass with high pressure stress and high safety according to claim 8, characterized in that a thermal migration process at a temperature of 350°C to 500°C is performed between the multiple ion exchange reactions, and the time is 15 to 500°C. 120min.
16. The method for processing tempered glass with high pressure stress and high safety according to claim 8, characterized in that when ion exchange is performed on multiple batches of glass substrates, the compressive stress CS on the surface of the tempered glass that is not in the first batch is detected When the compressive stress on the surface of the first tempered glass drops to 5% to 20%, the ion exchange reaction is stopped, and the lithium ion purified product is put into the salt bath, heated and purified, and the ion exchange is continued.
17. The method for processing strengthened glass with high pressure stress and high safety according to claim 16, wherein the lithium ion purified product is an ion sieve material, and the ion sieve material is based on the wt% of the oxide, and contains: SiO ₂ is 15% to 55%, auxiliary materials are 5% to 50%, and at least one functional metal oxide is 15% to 48%; the metals in the functional metal oxides are monovalent and/or divalent metals .
18. The method for processing strengthened glass with high pressure stress and high safety according to claim 16, wherein the lithium ion purified product is an ion sieve material, and the monovalent metal is one of lithium, sodium, potassium, and rubidium. At least one, the divalent metal is at least one of magnesium, calcium, strontium, and barium _; the auxiliary material and SiO form polar covalent bonds and ionic bonds, and the auxiliary material is selected from phosphorus oxide, boron oxide, oxide At least one of aluminum, zirconia, chromium oxide, iron oxide, zinc oxide, bismuth oxide, and cobalt oxide.
19. The method for processing strengthened glass with high pressure stress and high safety according to claim 16, wherein the heating and purification temperature is 360°C to 450°C, and the purification time is consistent with the time when the glass substrate is chemically strengthened .
20. The method for processing tempered glass with high pressure stress and high safety according to claim 16, wherein the input amount of the lithium ion purified product is 0.1% to 2% of the mass of the ion exchange salt bath.
21. A consumer electronics terminal, comprising:

    a housing including a front surface, a rear surface and a side surface;

    and an electronic assembly located partially within the housing, the electronic assembly including a display located at or adjacent to a front surface of the housing;

    The front surface or/and the rear surface or/and the side surface includes the tempered glass with high pressure stress and high safety according to any one of claims 1-20.
22. The consumer electronic terminal according to claim 21, further comprising a covering product covering the front surface of the casing or on the display, the covering product comprising the high-voltage device according to any one of claims 1-20 Tempered glass for stress and high security.
23. The consumer electronic terminal according to claim 21 or 22, wherein the consumer electronic terminal comprises a mobile phone, a tablet computer or other electronic terminals.

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