CN114477737A - Chemical strengthening method for hot-bent glass, hot-bent strengthened glass and electronic equipment - Google Patents
Chemical strengthening method for hot-bent glass, hot-bent strengthened glass and electronic equipment Download PDFInfo
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- CN114477737A CN114477737A CN202011252247.4A CN202011252247A CN114477737A CN 114477737 A CN114477737 A CN 114477737A CN 202011252247 A CN202011252247 A CN 202011252247A CN 114477737 A CN114477737 A CN 114477737A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
- C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
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- Materials Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention provides a chemical strengthening method of hot bent glass, which comprises the steps of putting the hot bent glass into first molten salt for first-step strengthening, wherein the first-step strengthening condition meets one of the following relational expressions; t is 0.16T + a, -9 is less than or equal to a and less than or equal to 224, and T is less than or equal to 600 and less than 650, and the relation is I; t is 0.22T + b, -49 and b are less than or equal to 185, 650 and T are less than or equal to 700, and the relation is two; t is 0.12T + c, c is more than or equal to 15 and less than or equal to 255, T is more than or equal to 700 and less than or equal to 750, and the relational expression is III; t1 is 0.02T + d, d is more than or equal to 350 and less than or equal to 442, T is more than or equal to 600 and less than or equal to 750, and the relation is four. A thermally bend strengthened glass and an electronic device are also provided. According to the method, the relational expression of the time and the temperature of the hot bending forming during the first-step strengthening and the relational expression of the temperature and the temperature of the hot bending forming during the first-step strengthening are set, so that the strengthening effect of the hot bending glass can be enhanced.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a chemical strengthening method of hot-bent glass, the hot-bent strengthened glass and electronic equipment.
Background
Along with the rapid development of electronic equipment and the increasing improvement of the living standard of people, people pay more and more attention to the aesthetic feeling of the appearance and the using hand feeling of the electronic equipment, the hot bending glass is the curved glass which is formed by heating and softening flat glass in a mould by means of dead weight or counterweight and the like and is manufactured by annealing, the edge of the curved glass can be in a bending state and is used for the electronic equipment, the appearance novelty of the electronic equipment can be improved, and the using hand feeling of a user can be improved. When the glass is subjected to hot bending, the surface of the glass tends to be in the lowest energy state, and alkaline metal ions are gathered towards the surface of the glass, so that the ion arrangement of the surface of the hot-bent glass is tighter, so that compared with cold-processed glass, the ion exchange is more difficult during the hot-bent glass strengthening, namely, under the same strengthening condition, the ion exchange depth of the hot-bent glass is smaller than that of the cold-processed glass, namely, the strengthening effect of the hot-bent glass under the same chemical strengthening condition is lower than that of the cold-processed glass.
Disclosure of Invention
The present disclosure is directed to solving at least one of the problems in the prior art. To this end, in a first aspect of the present application, there is provided a chemical strengthening method for hot-bent glass, which enables the hot-bent glass to achieve the same strengthening effect as that of a cold-worked glass after chemical strengthening, the chemical strengthening method comprising:
carrying out hot bending molding on the glass preform to obtain hot bent glass, wherein the thickness of the hot bent glass is 0.50-1.0 mm;
carrying out first preheating on the hot bent glass;
putting the first preheated hot bent glass into first molten salt for first-step strengthening, wherein the first-step strengthening condition meets one of the following relational expressions I to IV;
t is 0.16T + a, -9 is more than or equal to a and less than or equal to 224, and T is more than or equal to 600 and less than 650;
t is 0.22T + b, -49 and b are less than or equal to 185, and 650 and T are less than or equal to 700;
t is 0.12T + c, c is more than or equal to 15 and less than or equal to 255, and T is more than or equal to 700 and less than or equal to 750;
t1 is 0.02T + d, d is more than or equal to 350 and less than or equal to 442, and T is more than or equal to 600 and less than or equal to 750;
wherein T is the time of the first step of strengthening, the value range of T is 95min-355min, T is the temperature of hot bending forming of the hot bent glass, T1 is the temperature of the first step of strengthening, and the value range of T1 is 362-457 ℃.
In a second aspect of the present application, there is provided a hot bend strengthened glass produced by the chemical strengthening method described above.
In a third aspect of the present application, there is provided an electronic device comprising the thermally bend strengthened glass as described above.
The invention has the beneficial effects that: this application sets up the time when first step is reinforceed and the relational expression of the fashioned temperature of hot bending according to the different shaping temperature interval of hot bending glass, and the temperature when setting up first step and the relational expression of the fashioned temperature of hot bending, make the hot bending glass's after the reinforceing potassium ion exchange depth and sodium ion exchange depth great, ion exchange rate is higher, be favorable to reinforcing glass intensity, and glass surface compressive stress, the stress and the central tensile stress that sodium ion and potassium ion decomposed out are all less, have stronger shock resistance, can strengthen hot bending glass intensity, make hot bending glass can reach the intensive effect the same with cold working glass chemical strengthening after the chemical strengthening.
Detailed Description
While the following is a description of the preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
An embodiment of the present invention provides a method for chemically strengthening hot-bent glass, including step S100, step S200, and step S300, which are described below.
And S100, performing hot bending forming on the glass preform to obtain hot bent glass, wherein the thickness of the hot bent glass is 0.50mm-1.0 mm. The glass preform may be a planar sheet or have some three-dimensional shape. The method also comprises the steps of carrying out CNC machining, edge sweeping, polishing, cleaning and the like after hot bending forming to obtain the hot bending glass to be strengthened, wherein the CNC machining refers to computer numerical control precision machining.
Specifically, the planar glass to be hot-bent with the thickness of 0.50mm-1.0mm is placed into a hot bending machine, the hot bending forming temperature of the glass is heated to 600-750 ℃, the temperature is kept for 1-10min, nitrogen is continuously introduced into the hot bending machine in the heating process, and the glass is slowly and uniformly cooled to the room temperature after the temperature is kept, so that the hot-bent glass can be obtained;
step S200, carrying out first preheating on the hot bent glass. The purpose of the first preheating is to advance the temperature rise of the hot bent glass waiting for the first step of strengthening and reduce the breakage of the hot bent glass product caused by sudden heat. In a further embodiment, the temperature of the first preheating is 280 ℃ to 400 ℃ and the time of the first preheating is 15min to 60 min.
Step S300, putting the first preheated hot bent glass into first molten salt for first-step strengthening, wherein the first-step strengthening condition meets one of the following relational expressions I to IV:
t is 0.16T + a, -9 is less than or equal to a and less than or equal to 224, and T is less than or equal to 600 and less than 650;
t is 0.22T + b, -49 < b < 185, 650 < T < 700;
t is 0.12T + c, c is more than or equal to 15 and less than or equal to 255, and T is more than or equal to 700 and less than or equal to 750;
t1 is 0.02T + d, d is more than or equal to 350 and less than or equal to 442, and T is more than or equal to 600 and less than or equal to 750;
wherein T is the time of the first step of strengthening, the value range of T is 95min-355min, T is the hot bending forming temperature of the hot bent glass, T1 is the temperature of the first step of strengthening, and the value range of T1 is 362-457 ℃.
The chemical strengthening method is to put the glass to be strengthened in molten alkali salt to exchange the ions in the surface layer of the glass with the ions in the molten salt, and because of the volume change after the exchange, compressive stress is formed on the two surfaces of the glass, and tensile stress is formed inside the glass, thereby achieving the effect of improving the strength of the glass. In the first-step strengthening process, when the forming temperature of the hot bent glass is different, the particle distribution state of the surface of the hot bent glass is different, so that the time and the temperature during the first-step strengthening can influence the ion exchange effect. Through a large number of experiments, the hot-bent glass is prepared with a good strengthening effect when the condition of the first preheated hot-bent glass during the first-step strengthening meets one of the four relational expressions, wherein the relational expressions I to III are relational expressions between the hot-bent glass and the first-step strengthening time in different hot-bent forming temperature intervals, and the relational expression IV is a relational expression between the hot-bent glass and the first-step strengthening temperature in different hot-bent forming temperatures. Experiments show that the strengthened hot-bending glass has larger potassium ion exchange depth and sodium ion exchange depth in the range of the application, which indicates that the higher the ion exchange rate in the strengthening stage is, and is beneficial to enhancing the strength of the glass. It has been found experimentally that within the scope of the present application, the central tensile stress is smaller, the smaller the above values, the stronger the impact resistance, also indicating an increased hot bending glass strength.
In a further embodiment, the first molten salt comprises 33% to 69.5% by mass of NaNO3And 30.5% -67% KNO3. In the first step of strengthening, the small-radius alkali metal lithium ions on the surface of the glass are replaced by the large-radius alkali metal sodium ions in the first molten salt, the sodium ions on the surface of the glass are replaced by the large-radius potassium ions in the first molten salt, the radius of the potassium ions is greater than that of the sodium ions, and the radius of the sodium ions is greater than that of the lithium ions, so that a 'squeezing and blocking' effect can be generated on the surface of the glass, and the glass strengthening effect is achieved. NaNO in first molten salt3And KNO3The dosage of the compound can influence the ion exchange effect, and the formula has better effect. Preferably, the first molten salt comprises 34-50% by mass of NaNO3And 50% -66% KNO3. Preferably, the first molten salt comprises 35 to 40 mass percent of NaNO3And 60% -65% of KNO3. Preferably, the first molten salt comprises 36.5-38% by mass of NaNO3And 62% -63.5% of KNO3。
In a further embodiment, the glass preform has a chemical composition comprising, in mole percent, 20% to 80% SiO22 to 30 percent of Al2O31% -20% of Li2O, 3-25% of Na2O and 1-10% of other components. Wherein the other components include CaO, MgO, and P2O5And the like. In the present application, glass of the above formulation is preferably usedThe glass preform is subjected to a first step of strengthening after hot bending.
In a further embodiment, the chemical strengthening method further comprises:
and putting the hot bent glass subjected to the first-step strengthening into second molten salt for second-step strengthening, wherein the temperature of the second-step strengthening is 360-455 ℃, and the time of the second-step strengthening is 20-280 min. And after the second step of strengthening, a secondary strengthened stress layer is formed in the original stress layer on the surface layer of the glass, and the double-layer stress layers can effectively reduce the warping of the glass and improve the shock resistance of the glass.
In a further embodiment, the second molten salt comprises, in mass percent, 1.5% to 52% NaNO3And 48% -98.5% of KNO3. In the second step of strengthening, the residual lithium ions of the small-radius alkali metal on the surface of the glass are replaced by sodium ions of the large-radius alkali metal in the second molten salt, and the residual sodium ions on the surface of the glass are replaced by potassium ions of the large radius in the second molten salt. NaNO in second molten salt3And KNO3The dosage of the compound can influence the ion exchange effect, and the formula has better effect. Preferably, the second molten salt comprises 5-30% of NaNO by mass percent3And 70% -95% KNO3. Preferably, the second molten salt comprises 7 to 20 mass percent of NaNO3And 80% -93% KNO3. Preferably, the second molten salt comprises 9.5 to 11 mass percent of NaNO3And 89% -90.5% KNO3。
In a further embodiment, the thickness of the hot bent glass is 0.55m-0.65 mm. The effect is preferable when the thickness of the hot-bent glass is set to 0.55mm to 0.65 mm.
In a further embodiment, before the hot-bent glass after the first step of strengthening is put into the second molten salt, the chemical strengthening method further comprises:
and carrying out secondary preheating on the hot bent glass after the first-step strengthening, wherein the temperature of the secondary preheating is 280-400 ℃, and the time of the primary preheating is 15-60 min. The purpose of the second preheating is to advance the temperature rise of the hot bent glass waiting for the second step of strengthening, and reduce the breakage of the product caused by sudden heating.
An embodiment of the invention also provides a hot-bending strengthened glass, and the hot-bending strengthened glass is prepared by the chemical strengthening method. The shape of the hot bending strengthened glass is not limited and can be set according to actual needs.
An embodiment of the invention also provides an electronic device, which comprises the hot-bending strengthened glass. The electronic equipment comprises mobile phones, tablet computers, notebooks, wearable products, intelligent home terminals and other electronic equipment.
In order to better explain the technical solution of the present invention, the following description is made with reference to a plurality of specific examples.
Example 1
Placing a flat glass preform with a thickness of 0.55mm into a hot bending machine, heating to 650 deg.C (i.e. the temperature for hot bending is 650 deg.C), and keeping for 2min, wherein the flat glass preform comprises chemical components including 35-70% of SiO in terms of mole percentage215-30% of Al2O31-10% of Li2O, 5-15% of Na2O and 3-10% of other components. Cooling to room temperature, and performing the working procedures of CNC processing, edge sweeping, polishing, cleaning and the like to obtain the hot bent glass to be strengthened.
And putting the hot bent glass into a preheating furnace for primary preheating, wherein the time of the primary preheating is 118min, and the temperature of the primary preheating is 300 ℃.
After preheating, the hot-bent glass is placed in NaNO with the mass fraction of 38%3And 62% KNO3And in the first molten salt with the temperature of 380 ℃, carrying out first-step strengthening, wherein the time of the first-step strengthening is 90 min.
After the first-step strengthening is finished, directly discharging the glass out of the furnace, naturally cooling the glass to be below 100 ℃, then carrying out second-step strengthening, firstly putting the glass into a preheating furnace for second preheating, wherein the second preheating time is 35min, the second preheating temperature is 300 ℃, and after the preheating is finished, placing the glass in NaNO with the mass fraction of 9 percent respectively3And 91% KNO3And in a second molten salt at the temperature of 380 ℃, performing second-step strengthening, wherein the time of the second-step strengthening is 26min, and obtaining the strengthened glassGlass.
Example 2
Placing a flat glass preform with a thickness of 0.55mm into a hot bending machine, heating to 650 deg.C (i.e. the temperature for hot bending is 650 deg.C), and keeping for 2min, wherein the flat glass preform comprises chemical components including 35-70% of SiO in terms of mole percentage215-30% of Al2O31-10% of Li2O, 5-15% of Na2O and 3-10% of other components. Cooling to room temperature, and performing the procedures of CNC processing, edge sweeping, polishing, cleaning and the like to obtain the hot bent glass to be strengthened.
And (3) putting the hot bent glass into a preheating furnace for primary preheating, wherein the time of the primary preheating is 95min, and the temperature of the primary preheating is 383 ℃.
After preheating, the hot-bent glass is placed in NaNO with the mass fraction of 38%3And 62% KNO3And in the first molten salt with the temperature of 380 ℃, carrying out first-step strengthening, wherein the time of the first-step strengthening is 90 min.
After the first-step strengthening is finished, directly discharging the glass out of the furnace, naturally cooling the glass to be below 100 ℃, then carrying out second-step strengthening, firstly putting the glass into a preheating furnace for second preheating, wherein the second preheating time is 35min, the second preheating temperature is 300 ℃, and after the preheating is finished, placing the glass in NaNO with the mass fraction of 9 percent respectively3And 91% KNO3And in a second molten salt with the temperature of 380 ℃, performing second-step strengthening, wherein the time of the second-step strengthening is 26min, and obtaining the strengthened glass.
Example 3
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 630 ℃ and the first-step strengthening time was 116min in example 1.
Example 4
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 680 ℃ and the first-step strengthening time was 124min in example 1.
Example 5
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 730 ℃ and the first-step strengthening time was 130min in example 1.
Example 6
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 630 ℃ and the first-step strengthening time was 95min and the first-step strengthening temperature was 363 ℃.
Example 7
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 680 c, the first-step strengthening time was 95min, and the first-step strengthening temperature was 367 c, as in example 1.
Example 8
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 730 ℃ and the first-step strengthening time was 95min and the first-step strengthening temperature was 370 ℃.
Example 9
Unlike example 1, the first molten salt comprises 37% NaNO by mass3And 63% KNO3The second molten salt comprises 10 percent of NaNO by mass percent3And 90% KNO3The reinforced glass was prepared in the same manner as in example 1.
Reference examples
Unlike example 1, the glass obtained by subjecting a flat glass having a thickness of 0.55mm to the same CNC processing, edge sweeping, polishing, and cleaning was strengthened, and in this example, the glass was cold glass and was hot-bent glass without hot-bending. Specifically, the glass is put into a preheating furnace for primary preheating, the time of the primary preheating is 95min, and the temperature of the primary preheating is 300 ℃.
After preheating, the hot-bent glass is placed in NaNO with the mass fraction of 38%3And 62% KNO3And carrying out first-step strengthening in first molten salt at the temperature of 380 ℃, wherein the time of the first-step strengthening is 90 min.
After the first step of strengthening is finished, directly discharging the glass out of the furnace and naturally cooling the glass to be below 100 DEG CPerforming second-step strengthening, namely putting the glass into a preheating furnace for second preheating for 35min at the temperature of 300 ℃, and after preheating is finished, putting the glass into NaNO with the mass fraction of 9 percent respectively3And 91% KNO3And in a second molten salt with the temperature of 380 ℃, performing second-step strengthening, wherein the time of the second-step strengthening is 26min, and obtaining the strengthened glass.
Comparative example 1
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 630 ℃ and the first-step strengthening time was 85min and the first-step strengthening temperature was 362 ℃.
Comparative example 2
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 680 c, the first-step strengthening time was 90min, and the first-step strengthening temperature was 362 c, as in example 1.
Comparative example 3
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 730 ℃ and the first-step strengthening time was 95min and the first-step strengthening temperature was 362 ℃.
Comparative example 4
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 630 ℃ and the first-step strengthening time was 85min and the first-step strengthening temperature was 360 ℃.
Comparative example 5
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 680 c, the first-step strengthening time was 95min, and the first-step strengthening temperature was 362 c, as in example 1.
Comparative example 6
The reinforced glass was prepared in the same manner as in example 1 except that the glass forming temperature was 730 ℃ and the first-step strengthening time was 95min and the first-step strengthening temperature was 364 ℃.
The relationship between the time or temperature at the first-step strengthening of examples 1 to 8, reference examples, and comparative examples 1 to 6 described above and the temperature of hot-bending is shown in table 1.
TABLE 1
The glasses prepared in the above examples 1 to 8, reference examples, and comparative examples 1 to 6 were subjected to performance tests including potassium ion exchange depth (represented by DOL), sodium ion exchange depth (represented by DOC), glass surface stress (represented by CS), stress at the boundary between sodium ions and potassium ions (represented by CSK), and central tensile stress (CT), wherein DOC and CT were measured using SLP-1000, DOL, CS were measured using FSM-6000LEUV, and CSK was fitted using SLP-1000 and FSM-6000LEUV test results. Specific results are shown in table 2.
TABLE 2
It can be seen from tables 1 and 2 that the glasses prepared in examples 1 to 9 have better effects in satisfying the conditions of the present application. Specifically, the first-step strengthening time and the glass forming temperature in examples 1 and 3 satisfy the first relational expression, the first-step strengthening temperature and the glass forming temperature in examples 2, 6 to 8 satisfy the fourth relational expression, the first-step strengthening temperature and the glass forming temperature in example 4 satisfy the second relational expression, and the first-step strengthening temperature and the glass forming temperature in example 5 satisfy the third relational expression; while comparative examples 1 and 4 are not satisfied with relational expression one and relational expression four, comparative examples 2 and 5 are not satisfied with relational expression two and relational expression four, and comparative examples 3 and 6 are not satisfied with relational expression three and relational expression four; it can be seen from table 2 that the indexes of examples 1 to 8 are similar to those of comparative examples, which shows that the hot-bent glass strengthened by the method of the present application can achieve the same effect as that of the flat glass and is better than that of comparative examples 1 to 6, and although examples 5 and 7 have a smaller sodium ion exchange Depth (DOC) than that of comparative examples, the comprehensive performance of examples 5 and 7 is better than that of comparative examples. The indexes of comparative examples 1 to 6 are lower than those of the reference examples, and it is shown that the hot bent glass is inferior in strengthening effect when the conditions set in the present application are not satisfied.
Compared with the example 1, in the example 9, because the component proportion of the first molten salt and the second molten salt is adjusted, the stress (CSK) at the boundary of sodium ions and potassium ions in the example 9 is obviously lower than that in the example 1, and the slight adjustment of the components in the first molten salt and the second molten salt is beneficial to enhancing the chemical strengthening effect and improving the impact resistance of the hot-bent glass.
The above-mentioned embodiments only express 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 (10)
1. A method of chemically strengthening a hot-bent glass, the method comprising:
carrying out hot bending molding on the glass preform to obtain hot bent glass, wherein the thickness of the hot bent glass is 0.50-1.0 mm;
carrying out first preheating on the hot bent glass;
putting the first preheated hot bent glass into first molten salt for first-step strengthening, wherein the first-step strengthening condition meets one of the following relational expressions I to IV;
t is 0.16T + a, -9 is less than or equal to a and less than or equal to 224, and T is less than or equal to 600 and less than 650;
t is 0.22T + b, -49 and b are less than or equal to 185, and 650 and T are less than or equal to 700;
t is 0.12T + c, c is more than or equal to 15 and less than or equal to 255, and T is more than or equal to 700 and less than or equal to 750;
t1 is 0.02T + d, d is more than or equal to 350 and less than or equal to 442, and T is more than or equal to 600 and less than or equal to 750;
wherein T is the time of the first step of strengthening, the value range of T is 95min-355min, T is the temperature of hot bending forming of the hot bent glass, T1 is the temperature of the first step of strengthening, and the value range of T1 is 362-457 ℃.
2. The chemical strengthening method of claim 1, wherein the first molten salt comprises 33% to 69.5% by mass of NaNO3And 30.5% -67% KNO3。
3. The chemical strengthening method of claim 1, wherein the glass preform has a chemical composition comprising, in mole percent, 20% to 80% SiO22 to 30 percent of Al2O31% -20% of Li2O, 3-25% of Na2O and 1-10% of other components.
4. The chemical strengthening method of claim 1, further comprising:
and putting the hot bent glass subjected to the first-step strengthening into second molten salt for second-step strengthening, wherein the temperature of the second-step strengthening is 360-455 ℃, and the time of the second-step strengthening is 20-280 min.
5. The chemical strengthening method of claim 4, wherein the second molten salt comprises 1.5-52% NaNO by mass3And 48% -98.5% of KNO3。
6. The chemical strengthening method of claim 1, wherein the hot-bent glass has a thickness of 0.55m to 0.65 mm.
7. The chemical strengthening method of claim 1, wherein the temperature of the first preheating is 280 ℃ to 400 ℃, and the time of the first preheating is 15min to 60 min.
8. The chemical strengthening method of claim 4, wherein before placing the hot bent glass after the first strengthening into the second molten salt, the chemical strengthening method further comprises:
and carrying out second preheating on the hot bent glass after the first-step strengthening, wherein the second preheating temperature is 280-400 ℃, and the first preheating time is 15-60 min.
9. A hot-bend strengthened glass, wherein the hot-bend strengthened glass is prepared by the chemical strengthening method according to any one of claims 1 to 8.
10. An electronic device, wherein the electronic device comprises the thermally bend strengthened glass of claim 9.
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