CN106746741B

CN106746741B - Aluminosilicate glass, method for strengthening aluminosilicate glass, and strengthened glass

Info

Publication number: CN106746741B
Application number: CN201710147021.XA
Authority: CN
Inventors: 戴斌; 肖子凡
Original assignee: Shenzhen Csg Applied Technology Co ltd; CSG Holding Co Ltd
Current assignee: Shenzhen CSG Application Technology Co. Ltd.
Priority date: 2014-12-23
Filing date: 2014-12-23
Publication date: 2020-04-10
Anticipated expiration: 2034-12-23
Also published as: CN106746741A; CN104591538B; CN104591538A

Abstract

The invention provides an aluminosilicate glass, a method for strengthening the aluminosilicate glass, and a strengthened glass. The aluminosilicate glass comprises the following components in percentage by mole: 60 to 67 percent of SiO₂15 to 20 percent of Al₂O₃0 to 1% of Li₂O, 9.9 to 13.6 percent of Na₂O, 1 to 4.2 percent of K₂O, 0 to 1.8% CaO, 0.7 to 5% MgO, and 0.3 to 2% ZrO₂The Li₂O、Na₂O and K₂Total molar content of O is Σ R₂O, the SiO₂And Al₂O₃Has a total molar content of sigma XO, wherein sigma R₂O is 12 to 17 percent, sigma XO-sigma R₂The content of O is 60 to 74 percent,

wherein each component represents the mole percent of the component,

Description

Aluminosilicate glass, method for strengthening aluminosilicate glass, and strengthened glass

The present application is a divisional application of an invention patent application having an application number of 201410815759.5, entitled "aluminosilicate glass, method for strengthening aluminosilicate glass, and strengthened glass", filed 12/23/2014.

Technical Field

The present invention relates to an aluminosilicate glass, a method for strengthening an aluminosilicate glass, and a strengthened glass.

Background

In recent years, devices such as smartphones and tablet computers have become widespread, and a trend toward reduction in thickness and weight has been shown. One problem with thinning is that the strength of the glass decreases with decreasing thickness. In order to be able to meet the requirements of use, it is necessary for the display glass to have a high strength even at small thicknesses. To achieve this, the glass needs to be strengthened.

Currently, the composition of aluminosilicate glass used is high in the content of alkali metal oxide in order to ensure ion exchange capacity and in consideration of factors such as melting property, formability, resistance to devitrification of the glass. When an aluminosilicate glass is strengthened, a chemical strengthening method is generally selected because the glass is thin and the effect of physical strengthening is not significant.

The cover glass is mainly chemically strengthened aluminosilicate glass, and Al thereof₂O₃The mole fraction of the catalyst is generally 8-17%, the commonly used ion exchange temperature is 350-430 ℃, the time is 4-10 h, the surface pressure stress is 400-800 MPa, and the ion exchange depth is 20-80 μm.

The ion concentration and diffusion depth of the surface layer of the glass should increase with time and the surface compressive stress of the glass should increase without taking into account other factors. However, since glass is an amorphous material, there is a stress relaxation phenomenon at high temperature, which is always present throughout the ion exchange process. In the initial stage of ion exchange, the concentration difference ratio of liquid phase (molten salt) and solid phase (glass) on the interface of the glass surface and the molten salt is large, the mass transfer driving force is large, and ion diffusion is easy to carry out. Over time, this mass transfer rate will decrease as large radius ions accumulate at the glass surface, the rate of stress relaxation at constant temperature is substantially constant, and strengthening of the glass will be adversely affected when the stress generated by diffusing ions is less than the stress consumed by stress relaxation. Therefore, under constant temperature conditions, a maximum occurs on the compressive stress-time curve. This brings about the following problems.

Because the ion exchange temperature is limited in a lower range (350-430 ℃), on one hand, when a larger ion exchange depth needs to be obtained, the required time is longer (typically 4-10 h), and the efficiency is not high; on the other hand, the ion exchange time is long and the stress relaxation effect is easily caused, so that the combination of some surface compressive stress and the exchange depth can not be reached (namely, one of the surface compressive stress and the other of the surface compressive stress and the ion exchange depth can not meet the requirement), an extreme value appears on the surface compressive stress-ion exchange time curve, for the existing aluminosilicate glass, the time corresponding to the extreme value point is generally 3 h-5 h, then the surface compressive stress is reduced along with the time extension, when the ion exchange time is continuously prolonged for 2 h-3 h, the stress is obviously relaxed, the surface compressive stress is reduced by 20% -30%, and the application range is influenced.

Stress relaxation is mainly related to two conditions, one being temperature and the other being the chemical composition of the glass, and stress relaxation is unavoidable but its effect can be attenuated by adjusting the chemical composition of the glass.

Disclosure of Invention

In view of the above, it is desirable to provide an aluminosilicate glass which can be chemically strengthened at a relatively high temperature, the aluminosilicate glass having a surface compressive stress which is not significantly relaxed even when ion-exchanged for a long period of time, and the aluminosilicate glass having an increased ion-exchange depth, a strengthening method for the aluminosilicate glass, and a strengthened glass obtained by the strengthening method.

The aluminosilicate glass comprises the following components in percentage by mole:

60 to 67 percent of SiO₂15 to 20 percent of Al₂O₃0 to 1% of Li₂O, 9.9 to 13.6 percent of Na₂O, 1 to 4.2 percent of K₂O, 0 to 1.8% CaO, 0.7 to 5% MgO, and 0.3 to 2% ZrO₂The Li₂O、Na₂O and K₂Total molar content of O is Σ R₂O, the SiO₂And Al₂O₃Has a total molar content of sigma XO, wherein sigma R₂O is 12 to 17 percent, sigma XO-sigma R₂The content of O is 60 to 74 percent,

wherein each component represents the mole percent of the component,

the aluminosilicate glass has reasonable component content, the aluminosilicate glass can be chemically strengthened at a high temperature due to the matching of the components, tests show that the aluminosilicate glass can be chemically strengthened at 435-550 ℃, the ion exchange temperature is high, if the required ion exchange depth is small, the ion exchange time at a high temperature is short, even if the ion exchange time reaches 8 hours, obvious stress relaxation cannot occur, the stress relaxation effect is weak, and longer ion exchange time can be adopted, so that various combinations of surface pressure stress and exchange depth can be realized, and various applications can be met.

In one embodiment, the aluminosilicate glass has a stress relaxation coefficient ω ≧ 0.9, where ω ═ CS₈/CS₄，CS₄And CS₈Respectively represent the surface compressive stress of the aluminosilicate glass after ion exchange for 4h and 8h at the same ion exchange temperature.

In one embodiment, the composition comprises the following components in percentage by mole: 62 to 65.3 percent of SiO₂15 to 18 percent of Al₂O₃0 to 0.5% of Li₂O, 9.9 to 11.2 percent of Na₂O, 1 to 3.3 percent of K₂O, 0 to 1.8% CaO, 2 to 5% MgO, and 0.3 to 2% ZrO₂。

In one embodiment, the composition comprises the following components in percentage by mole: 65.3 to 67 percent of SiO₂15.4 to 18.9 percent of Al₂O₃0 to 0.6% of Li₂O, 10.2 to 13.6 percent of Na₂O, 2 to 4 percent of K₂O，0～1.5% CaO, 0.7-5% MgO and 0.5-1.4% ZrO₂。

In one embodiment, the composition comprises the following components in percentage by mole: 60% -62% of SiO₂15 to 20 percent of Al₂O₃0 to 1% of Li₂O, 10 to 13.6 percent of Na₂O, 1 to 2 percent of K₂O, 0 to 1.8% CaO, 3 to 5% MgO, and 0.3 to 2% ZrO₂。

A method for strengthening aluminosilicate glass, comprising the steps of:

preheating the aluminosilicate glass to enable the temperature of the aluminosilicate glass to be 415-530 ℃;

immersing the aluminosilicate glass into 435-550 ℃ molten salt for ion exchange to obtain strengthened glass; and

and removing the molten salt on the surface of the strengthened glass.

In one embodiment, the operation of removing the molten salt is specifically: and taking out the strengthened glass from the molten salt, putting the strengthened glass into a preheating furnace with the temperature of 415-530 ℃, cooling the strengthened glass to room temperature along with the furnace, and then carrying out ultrasonic cleaning to remove the residual molten salt on the surface of the aluminosilicate glass.

In one embodiment, the step of preheating the aluminosilicate glass further comprises the following steps: the above aluminosilicate glass is subjected to polishing treatment.

In one embodiment, the aluminosilicate glass has a surface flatness of at least 0.01mm after polishing.

A strengthened glass prepared by the strengthening method of the aluminosilicate glass.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The aluminosilicate glass comprises the following components in percentage by mol:

60% -70% of SiO₂13 to 20 percent of Al₂O₃0 to 1% of Li₂O, 8-17% of Na₂O, 0 to 5 percent of K₂O, 0 to 2% CaO, 0 to 7% MgO, and 0 to 2% ZrO₂，Li₂O、Na₂O and K₂Total molar content of O is Σ R₂O，SiO₂And Al₂O₃Has a total molar content of sigma XO, wherein sigma R₂O is 12 to 17 percent, sigma XO-sigma R₂The content of O is 60 to 74 percent.

Silicon dioxide (SiO)₂) Is an essential component for forming an aluminosilicate glass skeleton. SiO 2₂The strength, chemical stability and the like of the glass can be improved, and the mole percentage of the silicon dioxide is preferably 60-70%. If SiO₂When the molar fraction of (b) is less than 60%, the weather resistance of the aluminosilicate glass is insufficient; if it exceeds 70%, the aluminosilicate glass becomes refractory.

Aluminum oxide (Al)₂O₃) The aluminosilicate glass can improve the chemical stability and ion exchange performance, is a necessary component for promoting ion exchange, and the mole fraction is preferably 13-20%. If Al is present₂O₃The mole percentage content of the aluminosilicate glass is less than 13 percent, so that the aluminosilicate glass has insufficient ion exchange performance and is suitable for ion exchange at higher temperature; if the amount exceeds 20%, the viscosity of the aluminosilicate glass increases significantly and clarification is difficult.

Lithium oxide (Li)₂O) is an ion exchange component and is also a component for lowering the high-temperature viscosity of the aluminosilicate glass and improving the meltability and moldability of the aluminosilicate glass, and Li₂When O is too much, the glass is liable to devitrify and the weather resistance is deteriorated, and at the same time, stress relaxation occurs, and Li₂The preferable molar percentage of O is 0-1%.

Sodium oxide (Na)₂O) can obviously lower the melting temperature of the aluminosilicate glass, is an essential component for chemical strengthening, has the mol percentage of 8 percent to 17 percent, and if the mol percentage is less than 8 percent, the aluminum siliconThe acid salt glass can be mixed with K in molten salt⁺Exchanged Na⁺The required ion exchange degree is difficult to achieve, and meanwhile, the aluminosilicate glass is refractory; if it exceeds 17%, the weather resistance of the aluminosilicate glass is deteriorated.

Potassium oxide (K)₂O) can remarkably lower the melting temperature of aluminosilicate glass and improve the ion exchange performance of the aluminosilicate glass, and the aluminosilicate glass and Na₂The formation of mixed alkali effect by O can adjust the thermal expansion coefficient, K, of the aluminosilicate glass within a certain range₂The molar fraction of O is preferably 0 to 5%, and if it exceeds 5%, the glass is insufficient in weather resistance.

Li₂O、Na₂O and K₂O is an ion exchange component, Li₂O、Na₂O and K₂Total molar content of O Σ R₂O is preferably 12% to 17%, and when less than 12%, the meltability of the aluminosilicate glass deteriorates and the ion exchange performance is insufficient; if it exceeds 17%, the weather resistance of the aluminosilicate glass is deteriorated.

SiO₂And Al₂O₃The total molar content of (a) is sigma XO, sigma XO and sigma R₂Difference of O (i.e., ∑ XO- Σ R)₂O) is 60% to 74%, and if less than 60%, the weather resistance of the aluminosilicate glass deteriorates; if the content is more than 74%, the meltability of the aluminosilicate glass is deteriorated and the ion exchangeable ions are insufficient.

Calcium oxide (CaO) can reduce the viscosity of the aluminosilicate glass at high temperature to promote melting and clarification of the aluminosilicate glass, and if the content of CaO is too high, devitrification resistance of the aluminosilicate glass is deteriorated and ion exchange performance is reduced, so that the molar percentage content thereof is preferably 0 to 2%.

Magnesium oxide (MgO) is a component that reduces the high-temperature viscosity of the aluminosilicate glass to improve the meltability and moldability, and when the content is too high, the aluminosilicate glass is susceptible to devitrification, and the molar percentage content is preferably 0 to 7%.

Zirconium dioxide (ZrO)₂) Is a component for improving the ion exchange performance and chemical stability of the aluminosilicate glass, is not an essential component, and contains 2 percent at most in the invention; exceedWhen the content is 2%, the melting property of the aluminosilicate glass is deteriorated, and the aluminosilicate glass is likely to be crystallized.

Further preferably, the composition factor

Wherein each component represents the mole percent of the component,

if it is

Its resistance to stress relaxation is insufficient; if it is

Then SiO₂Too low in content of, or Al₂O₃Too high of an amount of (b) may conflict with the ranges of the aforementioned oxides and combinations thereof, i.e. in case the compositional requirements of the present invention are met,

must be less than or equal to 0.43.

The stress relaxation resistance of the glass is evaluated by adopting the stress relaxation coefficient.

Stress relaxation coefficient ω ═ CS₈/CS₄。

In the formula CS₄And CS₈The surface compressive stress of the same sample after ion exchange for 4h and 8h at the same ion exchange temperature is shown.

Here, the ion exchange temperature was 435 ℃ to 550 ℃.

The reason for selecting the ion exchange time of 4h and 8h here is: the surface compressive stress of the existing aluminosilicate glass reaches a maximum value generally within 3-5 hours, and then ion exchange is continuously carried out for 2-3 hours, so that the stress is obviously relaxed. For existing aluminosilicate glasses, ω < 0.855.

Tests show that the aluminosilicate glass carries out ion exchange at the temperature of 435-550 ℃,

then omega>0.9, and simultaneously, at the same temperature,

large samples have a weak stress relaxation effect.

When the aluminosilicate glass is prepared, weighing raw materials of the components, transferring the raw materials into a mortar for full grinding to enable the raw materials to be uniformly mixed, then placing the mixture into a platinum crucible, placing the platinum crucible into a silicon-molybdenum furnace, heating the platinum crucible to 1550-1650 ℃, preserving heat for 3-5 hours, clarifying the mixture, then pouring molten glass liquid into a mold for molding, and then annealing to obtain the bulk glass.

A method for strengthening an aluminosilicate glass according to an embodiment includes the steps of:

step S110, removing dirt on the surface of the aluminosilicate glass.

The aluminosilicate glass is the aluminosilicate glass.

60% -70% of SiO₂13 to 20 percent of Al₂O₃0 to 1% of Li₂O, 8-17% of Na₂O, 0 to 5 percent of K₂O, 0-2% CaO,0 to 7% of MgO and 0 to 2% of ZrO₂，Li₂O、Na₂O and K₂Total molar content of O is Σ R₂O，SiO₂And Al₂O₃Has a total molar content of sigma XO, wherein sigma R₂O is 12 to 17 percent, sigma XO-sigma R₂The content of O is 60 to 74 percent.

Specifically, in the present embodiment, the aluminosilicate glass is in the form of a plate having a thickness of 0.5mm to 2 mm.

In the present embodiment, the removal of the dirt on the surface of the aluminosilicate glass is performed using a detergent-containing disk brush. The detergent is deionized water. Of course, the washing is not limited to the use of a disc brush, and a cleaning tool such as a roll brush may be used.

It should be noted that if the surface of the aluminosilicate glass is relatively clean, cleaning is not required, and step S110 may be omitted.

And step S120, polishing the aluminosilicate glass.

Preferably, the surface flatness of the polished aluminosilicate glass is at least 0.01 mm.

In this embodiment, the surface of the aluminosilicate glass is polished by using a disk brush in combination with cerium oxide polishing powder. Of course, the polishing is not limited to the use of a disc brush, other polishing tools commonly used in the industry can be used, and the polishing powder is not limited to cerium oxide, but also other polishing powders commonly used in the industry.

It should be noted that if the surface of the aluminosilicate glass is flat and smooth and reaches a surface flatness of 0.01mm, for example, if the aluminosilicate glass is float glass, the surface does not need to be polished, and step S120 may be omitted.

And step S130, cleaning the aluminosilicate glass.

In this embodiment, when the aluminosilicate glass is cleaned, deionized water is used in combination with a rolling brush for cleaning. Of course, in other embodiments, other cleaning agents such as ethanol and acetone can be used for cleaning, and the cleaning is not limited to the use of a rolling brush, and other tools can be used for cleaning. And (3) drying the aluminosilicate glass after cleaning.

It should be noted that if the surface of the aluminosilicate glass is relatively clean, cleaning is not required, and step S130 may be omitted.

Step S140, preheating the aluminosilicate glass to enable the temperature of the aluminosilicate glass to be 415-530 ℃.

Preheating the aluminosilicate glass can prevent the aluminosilicate glass from bursting in the subsequent strengthening treatment process.

And S150, immersing the aluminosilicate glass into 435-550 ℃ molten salt for ion exchange to obtain the strengthened glass.

The molten salt comprises 90-100% KNO by mass₃And 0% -10% of NaNO₃. The molten salt may be any other molten salt commonly used in the industry for ion exchange.

Preferably, the time for ion exchange is 2 hours to 8 hours.

In the present embodiment, the depth of ion exchange is 30 to 86 μm under the condition that the time of ion exchange is 2 to 8 hours.

And step S160, removing the molten salt on the surface of the strengthened glass.

Specifically, the tempered glass is taken out of the molten salt and placed in a preheating furnace with the temperature of 415-530 ℃, the power supply of the preheating furnace is turned off, and the tempered glass is placed in water for ultrasonic cleaning after being cooled to the room temperature along with the furnace so as to remove the residual molten salt on the surface of the aluminosilicate glass. In this embodiment, the time for ultrasonic cleaning is 1 hour. Preferably, the temperature of the ultrasonic cleaning water is room temperature to 100 ℃.

According to the strengthening method of the aluminosilicate glass, the temperature of ion exchange is 435-550 ℃, the temperature of ion exchange is higher, if the required depth of ion exchange is smaller, the time of ion exchange at high temperature is shorter, so that the preparation time can be shortened, and meanwhile, even if the ion exchange time reaches 8 hours, obvious stress relaxation does not occur, the stress relaxation effect is weaker, and longer ion exchange time can be adopted, so that various combinations of surface pressure stress and exchange depth can be realized, and various applications can be met.

The tempered glass of an embodiment is produced by the method for tempering aluminosilicate glass described above.

The tempered glass can achieve the optimized combination of surface compressive stress and exchange depth, and can meet various applications.

The aluminosilicate glass, the method for strengthening aluminosilicate glass, and the strengthened glass will be described in detail below with reference to specific examples.

Examples 1 to 25

The compositions of the aluminosilicate glasses in examples 1 to 25 are shown in Table 1. The values for each material in table 1 are in mole percent of that material.

TABLE 1

In the preparation of the aluminosilicate glasses of examples 1 to 25, the raw materials were weighed in accordance with the raw material ratios in table 1, and the weighed raw materials were transferred to a mortar and sufficiently ground to be uniformly mixed, and then placed in a platinum crucible. And (3) putting the platinum crucible into a silicon-molybdenum furnace, heating to 1650 ℃, preserving heat for 3 hours, clarifying, pouring molten glass liquid into a mold for molding, and annealing at 650 ℃ to obtain the bulk glass. The block glass was cut into strips of 6mm by 50mm and sheets of 150mm by 100mm by 1.1 mm. The two end faces of the strip specimen were again ground to be substantially parallel and perpendicular to the side faces.

Wherein, R in Table 1₂O represents Li₂O、Na₂O and K₂The total molar content of O;

wherein each component represents the mole percent of the component.

Both sides of the samples of examples 1-25 were polished, cleaned and dried; preheating aluminosilicate glass, then immersing the aluminosilicate glass into molten salt for ion exchange to obtain strengthened glass, then taking out the strengthened glass, putting the strengthened glass into deionized water for ultrasonic cleaning for 1 hour, and then air-drying to obtain the strengthened glass. The preheating temperature, the composition of the molten salt, the temperature of the molten salt, and the time of ion exchange of the aluminosilicate glass of examples 1 to 25 are shown in table 2.

TABLE 2

"4/8" in Table 2 indicates that ion exchange was carried out for 4 hours and 8 hours, respectively.

The strengthened glasses prepared in examples 1-10 were tested for density ρ, Young's modulus E, coefficient of thermal expansion α, surface Compressive Stress (CS), and ion exchange Depth (DOL), and the results are shown in Table 3.

The density ρ is measured by a known archimedes method.

The Young's modulus E was measured by the flexural resonance method.

The thermal expansion coefficient α is measured by a German relaxation-resistant DIL-402PC horizontal expansion instrument, the heating rate is 5 ℃/min, the test range is 20-1000 ℃, and the data in the table is the average thermal expansion coefficient between 25 ℃ and 300 ℃.

The surface pressure stress (CS) and the ion exchange Depth (DOL) are calculated by observing the number of interference fringes and the intervals thereof by using a FSM-6000LE surface stress meter, and the calculation is automatically completed by a computer.

TABLE 3

Examples	ρ(g/cm³)	E(GPa)	α(10^-7K^-1)	CS(MPa)	DOL(μm)
						1	2.6626	102.99	70.81	797	42.35
2	2.5604	93.32	65.14	995	49.75
						3	2.6385	91.71	77.27	1002	57.32
4	2.6586	82.56	96.05	873	63.89
						5	2.6057	70.07	95.90	843	72.64
6	2.6968	71.51	96.33	859	70.85
						7	2.5185	95.09	67.55	953	85.68
8	2.5547	93.14	67.88	882	68.53
						9	2.5417	96.38	57.98	906	52.41
10	2.4900	94.90	60.54	750	30.17

As can be seen from Table 3, the compressive stress and the exchange depth of the strengthened glass prepared by the present invention can reach large values at the same time.

The tempered glasses prepared in examples 11 to 25 were ion-exchanged for 4 hours and 8 hours, respectively, and the surface compressive stress CS after ion-exchange for 4 hours and 8 hours was measured₄And CS₈Calculating ω ═ CS₈/CS₄The results are shown in Table 4.

TABLE 4

Examples	CS₄(MPa)	CS₈(MPa)	ω
				11	811	751	0.926
12	846	795	0.940
				13	732	686	0.937
14	857	791	0.923
				15	775	699	0.902
16	843	553	0.656
				17	802	586	0.731
18	748	593	0.793
				19	659	547	0.830
20	761	649	0.853
				21	826	763	0.924
22	855	810	0.947
				23	870	836	0.961
24	912	883	0.968
				25	938	911	0.971

As can be seen from Table 4, the strengthened glasses prepared in examples 11 to 15 all satisfy

Omega is also above 0.9. The tempered glasses prepared in examples 16 to 20 were not satisfactory

Both also have omega less than 0.9. The tempered glasses of examples 21 to 25 were all at 490 deg.CThen the ion exchange is carried out, and the ion exchange is carried out,

large samples also have large ω.

The above-mentioned embodiments only express one or several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The aluminosilicate glass is characterized by comprising the following components in percentage by mole:

60 to 67 percent of SiO₂15 to 20 percent of Al₂O₃0.1 to 1 percent of Li₂O, 9.9 to 13.6 percent of Na₂O, 1 to 4.2 percent of K₂O, 0 to 1.8% CaO, 0.7 to 5% MgO, and 0.3 to 2% ZrO₂The Li₂O、Na₂O and K₂Total molar content of O is Σ R₂O, the SiO₂And Al₂O₃Has a total molar content of sigma XO, wherein sigma R₂O is 12 to 17 percent, sigma XO-sigma R₂The content of O is 60 to 74 percent,

wherein each component represents the mole percent of the component,

the aluminosilicate glass must contain the K₂O, and the aluminosilicate glass necessarily contains the ZrO₂。

2. The aluminosilicate glass of claim 1, wherein the aluminosilicate glass has a stress relaxation coefficient ω ≧ 0.9, where ω ═ CS₈/CS₄，CS₄And CS₈Respectively represent the surface compressive stress of the aluminosilicate glass after ion exchange for 4h and 8h at the same ion exchange temperature.

3. The aluminosilicate glass of claim 1, comprising the following components in mole percent: 62 to 65.3 percent of SiO₂15 to 18 percent of Al₂O₃0.1 to 0.5 percent of Li₂O, 9.9 to 11.2 percent of Na₂O, 1 to 3.3 percent of K₂O, 0 to 1.8% CaO, 2 to 5% MgO, and 0.3 to 2% ZrO₂。

4. The aluminosilicate glass of claim 1, comprising the following components in mole percent: 65.3 to 67 percent of SiO₂15.4 to 18.9 percent of Al₂O₃0.1 to 0.6 percent of Li₂O, 10.2 to 13.6 percent of Na₂O, 2 to 4 percent of K₂O, 0 to 1.5% CaO, 0.7 to 5% MgO, and 0.5 to 1.4% ZrO₂。

5. The aluminosilicate glass of claim 1, comprising the following components in mole percent: 60% -62% of SiO₂15 to 20 percent of Al₂O₃0.1 to 1 percent of Li₂O, 10 to 13.6 percent of Na₂O, 1 to 2 percent of K₂O, 0 to 1.8% CaO, 3 to 5% MgO, and 0.3 to 2% ZrO₂。

6. A method for strengthening an aluminosilicate glass, comprising the steps of:

preheating the aluminosilicate glass of any one of claims 1 to 5 to a temperature of 415 ℃ to 530 ℃;

and removing the molten salt on the surface of the strengthened glass.

7. The method for strengthening an aluminosilicate glass according to claim 6, wherein the operation of removing the molten salt is specifically: and taking out the strengthened glass from the molten salt, putting the strengthened glass into a preheating furnace with the temperature of 415-530 ℃, cooling the strengthened glass to room temperature along with the furnace, and then carrying out ultrasonic cleaning to remove the residual molten salt on the surface of the aluminosilicate glass.

8. The method for strengthening an aluminosilicate glass according to claim 6, further comprising, before the step of preheating the aluminosilicate glass according to any one of claims 1 to 5: polishing the aluminosilicate glass according to any one of claims 1 to 5.

9. The method for strengthening aluminosilicate glass according to claim 8, wherein the aluminosilicate glass has a surface flatness of at least 0.01mm after polishing.

10. A strengthened glass produced by the strengthening method for an aluminosilicate glass according to any one of claims 6 to 9.