CN110746112B - Low-sodium glass, chemically strengthened glass and preparation method of chemically strengthened glass - Google Patents
Low-sodium glass, chemically strengthened glass and preparation method of chemically strengthened glass Download PDFInfo
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- CN110746112B CN110746112B CN201911017642.1A CN201911017642A CN110746112B CN 110746112 B CN110746112 B CN 110746112B CN 201911017642 A CN201911017642 A CN 201911017642A CN 110746112 B CN110746112 B CN 110746112B
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- 239000011521 glass Substances 0.000 title claims abstract description 104
- 239000011734 sodium Substances 0.000 title claims abstract description 42
- 239000005345 chemically strengthened glass Substances 0.000 title claims abstract description 28
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000005341 toughened glass Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 22
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 8
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 7
- 238000005342 ion exchange Methods 0.000 claims description 20
- 239000006058 strengthened glass Substances 0.000 claims description 18
- 150000003839 salts Chemical class 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 150000002500 ions Chemical class 0.000 claims description 6
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 claims description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 6
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 6
- 238000005728 strengthening Methods 0.000 claims description 6
- 238000003426 chemical strengthening reaction Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000006124 Pilkington process Methods 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 235000010333 potassium nitrate Nutrition 0.000 claims description 3
- 239000004323 potassium nitrate Substances 0.000 claims description 3
- 235000010344 sodium nitrate Nutrition 0.000 claims description 3
- 239000004317 sodium nitrate Substances 0.000 claims description 3
- 238000009658 destructive testing Methods 0.000 abstract description 5
- 239000006185 dispersion Substances 0.000 abstract description 5
- 229910001415 sodium ion Inorganic materials 0.000 abstract description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract 1
- 229910001416 lithium ion Inorganic materials 0.000 abstract 1
- 229910001414 potassium ion Inorganic materials 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 9
- 229910001413 alkali metal ion Inorganic materials 0.000 description 5
- 238000009472 formulation Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 244000137852 Petrea volubilis Species 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000006060 molten glass Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- 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
- C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
-
- 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
-
- 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
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Surface Treatment Of Glass (AREA)
- Glass Compositions (AREA)
Abstract
The invention discloses low-sodium glass, chemically strengthened glass and a preparation method of the chemically strengthened glass, wherein Na in the low-sodium glass 2 The mol% content of O is less than or equal to 4.5%, Li 2 The mol% content of O is 7.0% -13.0%, SiO 2 、B 2 O 3 、Al 2 O 3 And the sum of the mol% content of MgO is 78.0-88.0%. According to the invention, a small amount of sodium and potassium ions are exchanged to form low surface pressure stress, so that the internal corresponding tensile stress is reduced, the dispersion of destructive testing is reduced, the product quality is more uniform, the strength stability is improved, and the safety coefficient in the use process is improved; a large amount of lithium and sodium ions are exchanged to form a deep crack pressed layer, so that crack expansion is hindered, stress concentration at the tip of a crack is reduced, and the integral impact strength of the tempered glass is ensured.
Description
Technical Field
The invention relates to the technical field of glass production and manufacturing, in particular to low-sodium glass, chemically strengthened glass and a preparation method of the chemically strengthened glass.
Background
Chemically strengthened glass is widely used for protecting displays of various electronic devices due to its high strength and high transparency. Glass is a brittle solid material with high theoretical strength, however the actual strength of glass is much lower than its theoretical strength. This is because the glass surface develops a large number of micro-cracks during the forming and processing, these cracks cause stress concentration, and the stress at the tip of the crack 
Wherein σ 0 The stress is applied in the direction vertical to the crack, a is the depth of the crack, r is a fixed value, and a is far larger than r. This results in the stress σ experienced near the crack tip r To be compared with sigma 0 Much larger, the greater the crack depth a, σ r The larger the stress, the more concentrated the actual strength of the glass. In order to overcome the influence of microcracks on the surface of the glass, surface ion exchange, namely chemical strengthening, is adopted to obtain a compressive stress layer. Glass can be detached when chemically strengthenedExchange of Na of smaller radius inside + Ions and free larger radius K in molten salts + Exchange of ions, K + After ions enter the glass, a 'squeezing plug' effect is formed, so that higher pressure stress is generated on the surface of the glass; on the other hand, Li in glass + With Na in the molten salt + The ion exchange can form a deeper compressive stress layer, and the high strength of the chemically strengthened glass is the surface compressive stress layer formed by the two ion exchanges. Therefore, in the conventional glass strengthening, a large amount of sodium is often added to the glass in order to obtain higher surface compressive stress to improve the strength. However, after analyzing a large number of strength test experimental results of the tempered glass, it is found that the strength of the glass with high sodium content after being tempered is very poor in stability and large in discreteness, so that the glass is easy to crack under a small stress, and the use safety coefficient of the chemically tempered glass is greatly reduced.
Therefore, the prior art is not sufficient and needs to be improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide low-sodium glass, chemically strengthened glass and a preparation method of the chemically strengthened glass.
The technical scheme of the invention is as follows: provided is a low-sodium glass containing Na in the glass 2 The mol% content of O is less than or equal to 4.5%, Li 2 The mol% content of O is 7.0% -13.0%, SiO 2 、B 2 O 3 、Al 2 O 3 And the sum of the mol% content of MgO is 78.0-88.0%.
Preferably, SiO 2 The mol% content of (A) is in the range of 65.0% -72.0%.
Preferably, B 2 O 3 With Na 2 The ratio of the mol% content of O is in the range of 0.15 to 0.5.
Preferably, Li 2 O and Na 2 The sum of the mol% contents of O is 7.0-17.5%.
Preferably, the mother glass further comprises an oxide of Ce and an oxide of Tm, wherein the mol% content of the oxide of Ce is 0-2.0%, and the mol% content of the oxide of Tm is 0-1.0%.
Preferably, the mother glass is formed by any one of a float method, an overflow method, a rolling method and a firing method.
The invention also provides chemically strengthened glass, which is formed by subjecting the plain glass to a chemical ion strengthening process, wherein when the thickness of the plain glass is 0.3-1.2 mm, the surface compressive stress of the strengthened glass is 200-600 MPa, the depth of the compressive stress is 0.05-0.20 mm, and the linear density CTs of high tensile stress is larger than or equal to 45000 MPa/mm.
Preferably, the thickness of the mother glass is 0.3mm to 1.0mm, the surface compressive stress of the tempered glass is 200MPa to 550MPa, the depth of the compressive stress is 0.05mm to 0.18mm, and the high tensile stress linear density CTs is in the range of 45000MPa/mm to 60000 MPa/mm.
Preferably, the thickness of the mother glass is 0.4mm to 0.8mm, the surface compressive stress of the tempered glass is 200MPa to 500MPa, the depth of the compressive stress is 0.05mm to 0.15mm, and the high tensile stress density lines CTs are in the range of 50000MPa/mm to 65000 MPa/mm.
Preferably, the thickness of the mother glass is 0.5mm to 1.2mm, the surface compressive stress of the tempered glass is 300MPa to 500MPa, the depth of the compressive stress is 0.05mm to 0.2mm, and the high tensile stress density lines CTs are not less than 60000 MPa/mm.
Preferably, the strength of the strengthened glass meets the condition that the whole machine drop test load is 177g, the strengthened glass freely falls on the plane of 180-mesh sand paper, and the average value of the impact height is larger than or equal to 1.3 m.
The invention also provides a preparation method of the chemically strengthened glass, which comprises the following steps:
the chemically strengthened glass as described above is produced by subjecting the mother glass as described above to one or more ion exchanges in at least two salts of molten sodium nitrate, molten potassium nitrate and molten lithium nitrate.
Preferably, a heat treatment step is further included before the chemical strengthening.
By adopting the scheme, the invention has the following beneficial effects:
1. by the inventionThe low-sodium formula scheme is characterized in that a small amount of Na is used for chemically strengthening the low-sodium glass + And K + The ion exchange of the glass forms low surface pressure stress, and reduces the corresponding tensile stress in the glass, thereby reducing the dispersion of destructive testing, ensuring more uniform product quality, improving the strength stability and greatly improving the safety factor in the use process;
2. large amount of Li + With Na + The ion exchange of the glass forms a deep crack pressed layer, so that the crack is prevented from expanding, the stress concentration of the tip of the crack is reduced, and the integral impact strength of the tempered glass is ensured.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described in detail. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides low-sodium glass, in one embodiment, Na in the glass 2 The mol% content of O is less than or equal to 4.5%, Li 2 The mol% content of O is 7.0% -13.0%, SiO 2 、B 2 O 3 、Al 2 O 3 And the sum of the mol% content of MgO is 78.0-88.0%.
Further, in the present embodiment, in addition to the above embodiment, SiO is preferable 2 The mol% content of (A) is in the range of 65.0% -72.0%.
Further, in this example, Na is contained in the mother glass 2 The mol% content of O is less than or equal to 4.5%, Li 2 The mol% content of O is 7.0% -13.0%, SiO 2 、B 2 O 3 、Al 2 O 3 And the sum of the mol% contents of MgO is 78.0% to 88.0%, preferably B 2 O 3 With Na 2 The ratio of the mol% content of O is in the range of 0.15 to 0.5.
Further onIn this example, Na is contained in the mother glass 2 The mol% content of O is less than or equal to 4.5%, Li 2 The mol% content of O is 7.0% -13.0%, SiO 2 、B 2 O 3 、Al 2 O 3 The sum of the mol% of MgO and SiO is 78.0-88.0% 2 The mol% content of (B) is in the range of 65.0% to 72.0%, preferably B 2 O 3 With Na 2 The ratio of the mol% content of O is in the range of 0.15 to 0.5.
Further, in the present embodiment, Li is preferable on the basis of the above four embodiments 2 O and Na 2 The sum of the mol% contents of O is 7.0-17.5%.
Further, the mother glass also comprises an oxide of Ce and an oxide of Tm, wherein the mol% content of the oxide of Ce is 0% -2.0%, and the mol% content of the oxide of Tm is 0% -1.0%.
Specifically, the mother glass in the invention can be formed by a float method, an overflow method, a rolling method or a firing injection molding method,
the invention also provides chemically strengthened glass, which is formed by subjecting the above-mentioned mother glass to a chemical ion strengthening process, wherein in one embodiment, when the thickness of the mother glass is 0.3 mm-1.2 mm, the surface compressive stress of the strengthened glass is 200 MPa-600 MPa, the depth of the compressive stress is 0.05 mm-0.20 mm, and the linear density CTs of high tensile stress is larger than or equal to 45000 MPa/mm.
In another embodiment, the thickness of the mother glass is 0.3mm to 1.0mm, the surface compressive stress of the tempered glass is 200MPa to 550MPa, the depth of the compressive stress is 0.05mm to 0.18mm, and the high tensile stress linear density CTs is in the range of 45000MPa/mm to 60000 MPa/mm.
In still another embodiment, the mother glass has a thickness of 0.4 to 0.8mm, the tempered glass has a surface compressive stress of 200 to 500MPa, a compressive stress depth of 0.05 to 0.15mm, and a high tensile stress density CTs in the range of 50000 to 65000 MPa/mm.
In a further embodiment, the thickness of the mother glass is 0.5mm to 1.2mm, the surface compressive stress of the tempered glass is 300MPa to 500MPa, the depth of the compressive stress is 0.05mm to 0.2mm, and the high tensile stress density lines CTs are not less than 60000 MPa/mm.
Specifically, under the condition that the strength of the tempered glass meets the 177g weight of the whole machine drop test load, the tempered glass freely falls on the plane of 180-mesh sand paper, and the average value of the impact height is larger than or equal to 1.3 m.
The invention also provides a preparation method of the chemically strengthened glass, which comprises the following steps:
the chemical strengthening glass is prepared by carrying out heat treatment on the mother glass under a certain temperature condition for a certain time, and carrying out ion exchange on the heat-treated mother glass in at least two salts of molten sodium nitrate, molten potassium nitrate and molten lithium nitrate for one time or more times.
The following is an explanation of the related proper names and related measurement methods of the present invention:
plain glass: said inventive glass not being strengthened.
Chemically strengthened glass: is chemically toughened glass treated by a high-temperature ion exchange process. The large alkali metal ions in the high-temperature molten salt replace the small alkali metal ions in the glass to generate exchange plasma accumulation difference, and high-to-low pressure stress is generated in the surface layer of the mother glass to hinder and delay the expansion of glass microcracks, so that the aim of improving the mechanical strength of the glass is fulfilled.
Surface compressive stress: after the glass is chemically strengthened, the alkali metal ions with smaller radius on the surface are replaced by the alkali metal ions with larger radius, and the surface of the glass generates compressive stress due to the squeezing effect of the alkali metal ions with larger radius, which is called surface compressive stress.
Depth of compressive stress: the distance from the surface of the strengthened glass to the position where the compressive stress is zero.
High tensile stress linear density CTs: is the ratio of the sum of the tensile stresses of the glass measured by a stress tester to the thickness of the glass.
Pressing a crack layer: the regions of compressive stress within the strengthened glass, which are referred to as crack suppression layers, have a suppressing effect on the initiation and propagation of cracks.
And (3) complete machine drop test: a method for testing the strength of strengthened glass includes sticking the strengthened glass piece to the sample of electronic device such as mobile phone, dropping the glass from high position, recording the height of broken glass, and using the height value to reflect the strength of glass.
Impact height: the drop height of glass breakage in the complete machine drop test.
Six embodiments of the present invention are provided below, and a mother glass is prepared using the formulations of six glass raw materials listed in table 1. Table 2 shows the process parameters for preparing strengthened glass in six embodiments of examples 1 to 6. The physical properties of six embodiments of the strengthened glass are shown in Table 3.
Table 1, formulations (in mol%) of the mother glasses in examples 1 to 6:
table 2, process parameters for making strengthened glass in examples 1 to 6:
table 3, physical properties of the strengthened glass of each of examples 1 to 6:
further analysis was performed using example 1 as an example:
according to example 1 of Table 1Formulation preparation of mother glass plates in which SiO 2 Content of (3) 66.0 mol%, Al 2 O 3 Is 11.0 mol%, B 2 O 3 1.5 mol% of (B), 3.5 mol% of MgO, and Li 2 O content 15.0 mol%, Na 2 The content of O was 2.5 mol% and the content of Ce oxide was 0.5 mol%, and the raw materials were melted at 1640 ℃ to prepare a molten glass.
And forming the glass liquid into a mother glass plate by an overflow process, wherein the specific overflow process is carried out by adopting the prior art, and the thickness of the mother glass plate is 0.40 mm.
And then the mother glass plate is subjected to heat treatment at 700 ℃ for 120min, so that crystals with a certain structure are formed inside the mother glass plate.
The heat-treated plain glass is put in pure NaNO 3 Carrying out first ion exchange in the salt bath, wherein the temperature of the ion exchange is 430 ℃, and the exchange time is 4 h; then placing the glass obtained after the first ion exchange in 5 wt% of NaNO 3 And 95 wt% of KNO 3 The mixed salt bath is subjected to secondary ion exchange at 440 ℃ for 1h, so that the chemically strengthened glass is prepared. The surface compressive stress of the tempered glass is 280MPa, the compressive stress depth is 65 mu m, the high tensile stress linear density CTs is 63250MPa/mm, the tempered glass freely falls on a 180-mesh sand paper plane under the condition that the strength of the tempered glass meets 177g of balance weight of a complete machine drop test load, and the average value of the impact height is 1.30 m.
In the formulation of this example, the sodium ion content, Na, was reduced 2 The content of O is only 2.5 mol%, and Li is increased 2 O is used in a small amount of Na when the mother glass is chemically strengthened + And K + The ion exchange of the glass forms low surface pressure stress, and reduces the corresponding tensile stress in the glass, thereby reducing the dispersion of destructive testing, ensuring more uniform product quality, improving the strength stability and greatly improving the safety factor in the use process; while a large amount of Li + With Na + The ion exchange of the glass substrate forms a deep crack pressed layer, thus hindering the crack from expanding and reducing the stress concentration at the tip of the crack, thereby ensuring that the plain glass is strongThe whole impact strength after being transformed.
Further analysis was performed using example 6 as an example:
A mother glass plate was prepared according to the formulation of example 6 in Table 1, in which SiO was 2 Content of (B) 60.0 mol%, Al 2 O 3 Content of (B) 15.0 mol%, B 2 O 3 0.75 mol% of (B), 6.5 mol% of MgO, and Li 2 O content 15.0 mol%, Na 2 The content of O was 1.5 mol%, the content of Ce oxide was 0.25 mol%, and the content of Tm oxide was 1.0 mol%, and the raw materials were prepared into molten glass at a melting temperature of 1610 ℃.
And forming the glass liquid into a mother glass plate by a rolling method, wherein the specific rolling process adopts the prior art, and the thickness of the mother glass plate is 1.0 mm.
And then the mother glass plate is subjected to heat treatment at 650 ℃ for 30min, so that crystals with a certain structure are formed inside the mother glass plate.
The heat-treated plain glass is added with 8wt percent of NaNO 3 And 92 wt% of KNO 3 The mixed salt bath is subjected to primary ion exchange at 480 ℃ for 8 hours, so that the chemically strengthened glass is prepared. The surface compressive stress of the tempered glass is 450MPa, the compressive stress depth is 96 mu m, the high tensile stress linear density CTs is 47700MPa/mm, the tempered glass freely falls on a plane of 180-mesh sand paper under the condition that the strength of the tempered glass meets 177g of balance weight of a drop test load of a complete machine, and the average value of the impact height of the tempered glass is 1.65 m.
In the formulation of this example, the sodium ion content, Na, was reduced 2 The content of O is only 1.5 mol%, while Li is increased 2 O is used in a small amount of Na when the mother glass is chemically strengthened + And K + The ion exchange of the glass forms low surface pressure stress, and reduces the corresponding tensile stress in the glass, thereby reducing the dispersion of destructive testing, ensuring more uniform product quality, improving the strength stability and greatly improving the safety factor in the use process; while a large amount of Li + With Na + The ion exchange of (2) to form a deep pressed crack layer, thereby inhibiting crack propagation and reducing stress concentration at the crack tipThereby ensuring the whole impact strength of the tempered glass.
In conclusion, the invention has the following beneficial effects:
1. by the low-sodium formula scheme designed by the invention, a small amount of Na is used for chemically strengthening the low-sodium glass + And K + The ion exchange of the glass reduces the corresponding tensile stress in the glass, thereby reducing the dispersion of destructive testing and ensuring that the product quality is more uniform;
2. large amount of Li + With Na + The ion exchange of the glass forms a deep crack pressed layer, so that the crack is prevented from expanding, the stress concentration of the tip of the crack is reduced, and the integral impact strength of the tempered glass is ensured.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A chemical strengthened glass is characterized in that a chemical ion strengthening process is carried out on the plain glass to form the strengthened glass, and a heat treatment step is further included before the chemical strengthening, wherein the plain glass is subjected to heat treatment at 650-720 ℃ for 30-200min to form crystals with a certain structure in a plain glass plate;
in the mother glass:
SiO 2 、B 2 O 3 、Al 2 O 3 and MgO in a mol% ratio of 78.0% to 83.5%, SiO 2 The mol% content of (A) is in the range of 68.0-72.0%;
Na 2 the mol% content of O is less than or equal to 4.5%, Li 2 O and Na 2 The sum of the mol% contents of O is 16.0 to 17.5%, Li 2 The mol% content of O is 12.0-13.0%;
B 2 O 3 with Na 2 The ratio of the mol% content of O is within the range of 0.15-0.5;
when the thickness of the mother glass is 0.3 mm-1.2 mm, the surface compressive stress of the tempered glass is 200 MPa-600 MPa, the depth of the compressive stress is 0.05 mm-0.20 mm, and the high tensile stress linear density CTs is larger than or equal to 45000 MPa/mm.
2. The chemically strengthened glass according to claim 1, further comprising an oxide of Ce in a mol% content of 0% to 2.0% and an oxide of Tm in a mol% content of 0% to 1.0%.
3. The chemically strengthened glass according to claim 1, wherein the mother glass is formed by any one of a float method, an overflow method, a rolling method, and a firing method.
4. The chemically strengthened glass according to claim 1, wherein the thickness of the mother glass is 0.3 to 1.0mm, the surface compressive stress of the strengthened glass is 200 to 550MPa, the depth of the compressive stress is 0.05 to 0.18mm, and the high tensile stress linear density CT s Within the range of 45000 MPa/mm-60000 MPa/mm.
5. The chemically strengthened glass according to claim 1, wherein the thickness of the mother glass is 0.4 to 0.8mm, the surface compressive stress of the strengthened glass is 200 to 500MPa, the depth of the compressive stress is 0.05 to 0.15mm, and the high tensile stress density line CT s In the range of 50000 MPa/mm-65000 MPa/mm.
6. The chemically strengthened glass according to claim 1, wherein the thickness of the mother glass is 0.5 to 1.2mm, the surface compressive stress of the strengthened glass is 300 to 500MPa, the depth of the compressive stress is 0.05 to 0.2mm, and the high tensile stress density line CT s Greater than or equal to 60000 MPa/mm.
7. The chemically strengthened glass according to any one of claims 1 to 6, wherein the strengthened glass freely falls on a plane of 180 mesh sandpaper with an average height of impact of 1.3m or more under a strength satisfying a whole machine drop test load of 177 g.
8. A preparation method of chemically strengthened glass is characterized by comprising the following steps:
carrying out one or more times of ion exchange on the mother glass in at least two salts of molten sodium nitrate, molten potassium nitrate and molten lithium nitrate to prepare the chemically strengthened glass of any one of claims 1 to 7;
the method also comprises the following heat treatment steps before chemical strengthening: the mother glass is thermally treated at 650-720 ℃ for 30-200min, so that crystals with a certain structure are formed inside the mother glass plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911017642.1A CN110746112B (en) | 2019-10-24 | 2019-10-24 | Low-sodium glass, chemically strengthened glass and preparation method of chemically strengthened glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911017642.1A CN110746112B (en) | 2019-10-24 | 2019-10-24 | Low-sodium glass, chemically strengthened glass and preparation method of chemically strengthened glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110746112A CN110746112A (en) | 2020-02-04 |
| CN110746112B true CN110746112B (en) | 2022-07-29 |
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| CN110040982A (en) * | 2019-05-14 | 2019-07-23 | 深圳市东丽华科技有限公司 | Chemically reinforced glass and the preparation method and application thereof with combined stress advantage |
| CN110128008A (en) * | 2019-05-16 | 2019-08-16 | 平顶山市东丽华实业有限公司 | Low ultra-thin strengthened glass of radius of curvature and preparation method thereof, glass devices and element glass |
| CN110240419A (en) * | 2019-06-06 | 2019-09-17 | 深圳市东丽华科技有限公司 | Lithium aluminosilicate glass, lithium aluminium chemistry of silicones strengthened glass and the preparation method and application thereof |
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| CN108046613A (en) * | 2017-12-29 | 2018-05-18 | 深圳市东丽华科技有限公司 | A kind of strengthened glass and preparation method thereof |
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