AU2011101310A4 - Glass composition for strengthened cover glass - Google Patents
Glass composition for strengthened cover glass Download PDFInfo
- Publication number
- AU2011101310A4 AU2011101310A4 AU2011101310A AU2011101310A AU2011101310A4 AU 2011101310 A4 AU2011101310 A4 AU 2011101310A4 AU 2011101310 A AU2011101310 A AU 2011101310A AU 2011101310 A AU2011101310 A AU 2011101310A AU 2011101310 A4 AU2011101310 A4 AU 2011101310A4
- Authority
- AU
- Australia
- Prior art keywords
- glass
- mol
- ranges
- range
- mole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
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
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
-
- 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
- C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
-
- 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
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
- C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
- C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Glass Compositions (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
The present invention discloses a cover glass and a glass composition, wherein said glass composition comprises: SiO2 from about 5 70.5 to about 77.0 mole %; A120 3 from about 8.5 to about 12.5 mole %; Na 2O from about 10.6 to 14.6 mole %; K2 0 from about 1.1 to about 5.1 mole %; B2 0 3 from about 0 to 3 mole %; MgO from about 2.8 to about 5.8 mole %; CaO from about 0 to 3.7 mole %; and TiO2 from about 0 to 0.7 mole %; wherein inclusion of silica from about 70.5 to 77.0 mole % 10 decreases the overall density of the cover glass, wherein the density is in the range from about 2.3 to about 2.45 g/cm 3 . The glass is ion exchangeable at relatively low temperatures to a depth of at least 20 pm.
Description
1 GLASS COMPOSITION FOR STRENGTHENED COVER GLASS FIELD OF INVEVENTION Embodiments in general relate to a glass composition and a cover glass and in particular to a glass composition and a cover glass, wherein 5 the cover glass is scratch resistant and is featured with high silica content, reduced density, reduced brittleness and high strength. BACKGROUND OF THE INVENTION Devices such as the mobiles or cell-phones, palm top computers, 10 watches, laptops, portable gaming devices with displays, notebooks, televisions, displays in vehicles, touch panels screens and other electronic devices, etc., have become ubiquitous in devices, wherein at least a glass cover plate is included to protect the device (particularly the display part therein). The cover plate is generally transparent to allow 15 the user to view a display. The glass cover plate used in such devices is prone to breaking and/or damage due to various reasons such as accidental dropping, improper cleaning and also as the usage of the device increases. It is 20 desirable to have cover glasses designed to survive the high levels of ill treatment or accidental dropping that may occur due to contact or impact of the cover glass with sharp object.
2 Additionally, the glass cover plates must also exhibit high strength and at the same time must be scratch resistant if the device with the cover glass frequently contacted or touched such as in a touch screen display. 5 Typically, the glass covers are manufactured by one of the sheet glass manufacturing processes, namely, the float glass process, the down-draw fusion process, slot draw process, press-formable (molding) process, roller press process etc. 10 In particular, the down-draw fusion process [also known as the down draw process] is capable of producing a precision fire-polished surface that requires no additional modification such as grinding or polishing prior to use. The US patent numbers 3,338,696 and 3,682,609 disclose fusion downdraw processes which include allowing flow of molten glass 15 over the edges or weirs of a forming wedge, referred to as isopipe. The molten glass flows over converging forming surfaces of the isopipe and the separate flows reunite at the apex or root where the two converging forming surfaces meet to form a glass sheet. Thus, in the fusion process the glass which has been in contact with the forming surfaces is located 20 in the inner portion of the glass sheet and the exterior surfaces of the glass sheet are contact free. Pulling rolls positioned downstream of isopipe root capture edge portions of the glass sheet so formed to control the rate at which the glass sheet leaves the isopipe and thus aids 3 in controlling the thickness of the finished sheet. As the glass sheet descends from the root of the isopipe past the pulling rolls, it cools to form a solid elastic glass sheet, which may be processed further. 5 In order to achieve a good quality cover glass using the fusion technique, various material properties of the glass in the molten stage must be controlled within specified limits during the downdraw process or in any other sheet manufacturing process. 10 One such material property is the viscosity of the glass. It is desired to maintain the viscosity of the glass at the location where it leaves the isopipe at a value greater than about 10 5 poise, which if not maintained the glass sheet flatness and thickness across its width becomes difficult to control, which may result in a glass sheet not suitable for display 15 applications. Another significant factor is liquidus viscosity of the glass substrate. It is desired to have lower liquidus temperatures and hence higher liquidus viscosities for the downdraw process or any other manufacturing 20 process. The lower liquidus temperature and higher liquidus viscosity results in the glass being resistant to crystallization during the forming process. Since the forming is started at glass viscosities from about 10 4 4 to about 10 poise, it is desired that the glass exhibits a liquidus viscosity of greater than about 10 5 poise. Further, the substrate glass is desired to exhibit high durability to 5 chemical treatments during the TFT manufacturing and long term exposure to environmental conditions in service. Further, as the cover glass is to be used in portable devices such as laptops, clocks, mobiles, which are light-weight devices. This implies that 10 the substrate glass which forms an important part should also have low weight, which in-turn implies that the substrate glass itself should be light weight. Further light weight means that the thickness of the glass is less, and 15 for the portable device applications the thickness is less than about 1.1 mm, preferably less than about 0.7 mm and most preferably less than about 0.5 mm. It should be possible to manufacture glasses with the mentioned thickness and it is desired to have glass composition that are suitable for manufacture of such glasses, wherein the glasses may be 20 melt drawn into thin sheets of desired thickness. Additionally, it is desired that the substrate glass should exhibit a low coefficient of thermal expansion (CTE), typically, in the range of from 5 about 72 x 10-7/OC to about 76 x 10-7/C to be compatible with processes for Soda Lime glass which has a CTE close to 80 x 10-7/nC. Further, screens or glasses that are used for touch sensitive screens 5 of the electronic devices are typically chemically-strengthened by ion exchange method. The ion chemical strengthened ion-exchanging of the glasses provides extra strength to the glasses. The ion exchange step is carried out after the glass sheets are formed by chemically treating the heated glass sheets with a heated solution of ions having larger ionic 10 radius than ions that are present in the glass surface thereby replacing the smaller ions with larger ions. Typically the smaller ions are sodium and are replaced with larger ions such as potassium. It is known that glasses such as "the soda lime" glasses are 15 compatible with large-scale sheet glass manufacturing via float process but cannot be formed by methods particularly the down-draw process as the viscosities of the soda glasses are too low owing to their high liquidus temperatures. It is desired to have glasses that could be formed using any of the above mentioned processes for forming the glass 20 sheets. Also, the density of commercial soda lime glass is close to 2.5 g/cc, which makes the glass heavier for the application of the cover glass for displays.
6 The above described attributes or properties are impacted by the cover glass composition. SUMMARY OF THE INVENTION 5 Accordingly, an object is to provide a cover glass and a glass composition for the cover glass which meets almost all the above described attributes and yet its density is less than 2.45 g/cc. Another object is to provide a cover glass and a glass composition 10 compatible with the down draw process or the float glass process or slot draw process or press-formable (molding) process or roller press process. Still another object is to provide a cover glass and a glass 15 composition having higher viscosity. Yet another object is to provide a cover glass and a glass composition, wherein the liquidus viscosity of the glass is higher. 20 Another object is to provide a cover glass which is light-weight. Another object is to provide a cover glass with coefficient of thermal expansion in the range from about 72 x 10-7/"C to about 76 x 10- 7
/"C.
7 Another object is to have a cover glass composition for use in mobiles or cell-phones, palm top computers, watches, laptops, portable gaming devices with displays, notebooks, displays in vehicles, touch panels screens and other electronic devices. 5 Another object is to have a glass composition wherein the glass formed therefrom is ion-exchangeable. Another object is to have a glass composition wherein the glass 10 could be formed by any of the glass forming processes including the down-draw process, the float glass process, the slot draw process, the press-formable process, the roller press process etc. Other objects and advantages of the present invention will be more 15 apparent from the following description when read in conjunction with the accompanying figures, which are not intended to limit the scope of the present invention. Accordingly, the present invention relates to a glass composition and 20 a cover glass and in particular to a cover glass which is scratch resistant and is featured with high silica content, reduced density, reduced brittleness and high strength for use mobiles or cell-phones, palm top computers, watches, laptops, portable gaming devices with displays, 8 notebooks, displays in vehicles, touch panels screens and other electronic devices. In accordance with the present invention a cover glass and a glass 5 composition for the cover glass is disclosed, wherein said glass composition comprises of Si0 2 from about 70.5 mole % to about 77.0 mole %; A1 2 0 3 from about 8.5 mole % to about 12.5 mole %; Na 2 O from about 10.6 mole % to 14.6 mole %; K 2 0 from about 1.1 mole % to about 5.1 mole %; B 2 0 3 from about 0 mole % to 3 mole %; MgO from about 10 2.8 mole % to about 5.8 mole %; CaO from about 0 mole % to 3.7 mole %; and TiO 2 from about 0 mole % to 0.7 mole %; wherein inclusion of silica from about 70.5 mole % to 77.0 mole % decreases the overall density of the cover glass, wherein the density is in the range from about 2.3 to about 2.45 g/cm 3 , wherein the glass is down-drawable using the 15 fusion drawing process. In accordance with one embodiment the glass composition has a sum of mol% of B203, Na 2 O, K 2 0, MgO and CaO ranging from about 14.5 mol% to about 21.7 mol%, a sum of mol% of Na 2 0 and K 2 0 ranges 20 from about 11.7 mol% to about 16.9 mol%, a sum of mol% of MgO and CaO ranges from about 2.8 mol% to about 6.5 mol%, a sum of mol% of SiO 2 and A1 2 0 3 ranges from about 78.1 mol% to about 85.5 mol%, a sum of A1 2 0 3 and B 2 0 3 ranges from about 8.1 mol% to about 12.5 mol%.
9 In accordance with one embodiment the ratio of RO/A1 2 0 3 ranges from about 0 to about 0.7, where R represents one of Mg or Ca, the ratio of A 2 0/Al 2
O
3 ranges from about 0 to about 1.8, where A represents one of Na or K and the ratio of B 2 03/A 2 0 3 ranges from about 0 to about 0.36. 5 In accordance with the present invention the glass exhibits a coefficient of thermal expansion in the range from about 72 x 10- 7 /"C to about 76 x 10-7/C, a logarithm of liquidus viscosity in the range from about 6 to about 7.4, a Young's modulus in the range from about 72 10 GPa to about 76 GPa, an annealing temperature in the range from about 500 "C to about 700 C. In accordance with the present invention the glass is capable of being chemically strengthened by ion exchange and exhibits a 15 composition which can be formed by any of the forming processes known in the prior art including the down-draw process, the float glass process, the slot draw process, the press-formable process, the roller press process etc. 20 In accordance with the present invention the glass may be ion exchanged to a depth of 20 pm or more.
10 In another aspect in accordance with the present invention the glass exhibits a compressive stress of at least 100 MPa, a depth of layer of at least 20 pm and a thickness of at least 0.3 mm. 5 These and other embodiments, advantages and salient features of the present invention will become apparent from the following detailed description and appended claims. DETAILED DESCRIPTION OF THE INVENTION 10 The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used 15 herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein 20 The present invention is conceded with cover glasses for use mobiles or cell-phones, palm top computers, watches, laptops, portable 11 gaming devices with displays, notebooks, displays in vehicles, touch panels screens and other electronic devices. In accordance with the present invention, the cover glass 5 composition comprises of the major components of the glass, for use in cover glass , namely, Silica (Si0 2 ), Alumina (A1 2 0 3 ), alkaline earth oxides (AEO) such as MgO and CaO, alkali metal oxides such as Na 2 O and K 2 0 and titania (TiO 2 ) for increasing the refractive index of the glass. 10 In accordance with the present invention silica (SiO 2 ) behaves as the basic glass former, wherein the former (silica in this case) forms the basic skeleton or network. Farmers alone may form glass however the melting point in some cases (particularly when the former is silica) will be 15 so high so as to make it impractical to commercially melt the glasses. In accordance with the present invention the cover glass composition has high silica content in the range from about 70.5 mol % to 77 mol %, wherein the high silica content reduced the overall density of the cover glass as the density of the silica is about 2.2 g/cm 3 . 20 In accordance with the present invention the cover glass composition comprises A1 2 0 3 (mole percentage) in the range from about 8.5 % to 12.5 %, wherein A1 2 0 3 enhances viscosity of the glass.
12 in accordance with the present invention the cover glass composition comprises B 2 0 3 in the range from about 0 to 3 mole percentage. In accordance with the present invention alkali metal oxides reduces 5 the melting temperatures of the glass and also achieve low liquidus temperatures. In particular, in accordance with the present invention Na 2 O is used to permit ion exchange in order to manufacture considerably improved glass strength. In accordance with the present invention Na 2 O is provided in the range from about 10.6 to about 14.6 10 mole percent. In accordance with the present invention the cover glass composition is provided with potassium oxide (K20) in the range from about 1.1 to 5.1 mole percent, wherein K20 achieve low liquidus temperatures along with 15 decreased glass viscosity. In accordance with the present invention the provision of the alkaline earth oxides such as MgO and CaO results in modification of the glass network formed by the glass formers so as to reduce the melting 20 temperature and thereby improve other glass forming processes, e.g., refining. In accordance with the present invention the MgO and CaO are utilized as the modifiers in the range from about 2.8 to 5.8 more percent and 0 to 4.5 mole percent respectively.
13 In accordance with one embodiment of the present invention titania (TiO 2 ) is used to increase the refractive index as well as the intrinsic strength of the cover glass. 5 In accordance with one embodiment the present invention, the cover glass composition, comprises SiO 2 from about 70.5 to about 77.0 mole %; A1 2 0 3 from about 8.5 to about 12.5 mole %; Na 2 O from about 10.6 to 14.6 mole %; K 2 0 from about 1.1 to about 5.1 mole %; B 2 0 3 from about 0 to about 3 mole %; MgO from about 2.8 to about 5.8 mole %; CaO 10 from about 0 to 3.7 mole %; and TiO 2 from about 0 to 0.7 mole %; wherein inclusion of silica from about 70.5 to 77.0 mole % decreases the overall density of the cover glass. Exemplary compositions of the glass are listed in Table I in accordance with the embodiments of the present invention. 15 Table 1 .................. b e .1. EXAMPLES COMPONENTS 1 2 3 4 5 6 7 8 9 10 SiO, 70.5 70.5 70.5 70.6 71 70.5 70.5 703 70.5 71 A120 10.79 10.16 9.20 10.40 10 10.80 11.3 11.8 12.50 10 B203 0.00 0.63 .30 0-00 0.00 0.00 0.00 0.00 0.00 0.00 NaO 12-3 12.3 123 12.3 123 12 11.5 11 10.6 12.3 20 KO 2.1 2.1 2.1 2.3 21 2.1 21 2.1 I'S 2.1 MIgo 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 CaO 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 TiO 2 0.01 0.01 0.3 0.3 03 03 0.3 0.3 0.3 0.3 PROPERTY Density(gcc) 2.425 2425 2426 2-424 2.423 2424 2.422 2.420 2418 2.423 CTE (x104--7dgC) 80 79 78 80 S0 79 78 76 75 80 25 lqiasIusViscosity (Logn) Poise 6.6 6.7 6.8 6.6 6.7 6.5 64 62 61 67 StrainPoint(degQ 555 545 535 554 552 558 563 568 576 552 Yoms Moduius (GPA) 75 75 75 74 74 75 75 75 76 74 Annealng Temperatue (deg C) 634 625 615 632 626 642 656 670 694 626 14 Table 1 (continued ... COMPONENT 11 12 13 14 15 16 17 18 19 20 SiD2 71,5 72 72.5 72.8 733 73.8 74.2 74.7 75.2 755 AJO! 9.5 9 3.5 3.5 8.5 8.5 8.5 3.5 8.5 8,5 B203 0 0 0 0 0 0 0 0 0 0 NaO 12-3 12.3 123 12 11.5 I1 10.6 10.6 10.6 10.6 K20 2.1 2,1 2.1 2.1 2.1 2,1 2.1 1.6 1 1.1 MgO 3.8 8 3 3.8 3.3 3.8 3.8 3 3.8 3.8 3.5 CaO 0.5 0. 0.5 03 0.. 0.5 0.5 0.5 0.5 0.5 TiO, 0.3 0.3 03 0 0.3 03 0.3 0.3 0.3 0.3 PROPERTY Densiv(gicc) 2421 2A20 2.418 2,416 2A413 2.410 2.407 2A104 2401 2.398 1CTEx10^-7/degC) 79 79 79 78 76 75 73 73 73 73 LiquidusViscosity(Logn)Poise 6.8 7.0 7,1 7.1 7.1 7.1 7.1 7.2 72 7.2 Stain Point (deg C) 550 547 544 546 548 550 552 558 563 559 Young' Malus (GPA) 74 74 74 74 4 74 74 74 74 74 Annentng Terperature (deg C) 619 611 604 608 615 621 626 640 653 652 15 Table 1 (continued ...) EXAMPLES COMPONENT 21 22 23 24 25 26 27 28 29 30 SiO, 76 76.2 76.7 77 76 75.5 75 74.5 74 73.5 A:O; 3.5 ..5 85 8.5 8.5 8.5 8.5 8.5 8.5 8.5 B203 0 0 0 0 0 0 0 0 0 0 Na'O 10-6 10.6 20.6 10.6 10.8 113 12.8 123 12.8 13.3 K20 L. 1 1.1 L1 1 .1 L-1 L 1 L1 L12 1 MgO 3 2.8 2.8 2.8 2.8 2.3 2.8 2.3 2.8 2.3 CaO 05 0.5 0 0 0.5 0.5 0.5 0.5 0.5 0.5 Tio 0-3 0.3 0.3 0 03 03 0.3 0.3 03 03 PROPERTY Densitv&cc) 2.394 2393 2.387 2.381 2-394 2.397 2401 2.404 2.407 2410 CTE (x10^-7/degC) 73 73 72 72 73 75 77 73 30 32 Liquidus Viscocity(Logn) Poise 7.2 7.1 7.3 7.3 7.1 7.2 7.2 72 72 7.2 Strin Point (deg C) 552 549 547 545 548 545 543 541 539 536 Yaogs Modulus (GPA) 74 74 73 73 74 74 74 74 74 73 Anealing Temperature (deg Q 651 651 644 644 648 642 635 629 622 616 30 15 Table 1 (continued ...) EXAMPLES COMPONENT 31 32 33 34 35 36 37 38 39 40 Sio. 73 725 72.2 722 22 72-2 72,2 72.2 722 74 A2OE. S- 5 8.5 8 8.5 8.5 8.5 83 9 B203 0 0 0 0 0 0 0 0 0 0 NaiO 13.8 14.3 14.6 14.3 13.6 13.3 12.6 12,3 11.6 12.3 KO 1.1 11 1.1 11 1.1 1.1 1.1 1.1 1.1 1.1 MgO 2. 2.8 2.8 3.1 3.8 4 1 4.8 5,1 5.8 2.8 CaO 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.M 05 0.5 TiO2 0.3 0.3 0.3 0.3 0.3 0.3 0.3 03 0.3 0.3 PROPERTY Densitr (g/ce) 2.414 2.417 2419 2A19 2420 2.421 2.422 2.422 2_423 2.405 CTE (x10^-7:degC) 84 85 86 85 33 82 s0 79 77 79 Liquidus Viscosit (Log) Poise 7.2 72 7.2 7.2 73 73 7.4 7.4 74 7.0 Stra Point (degC) 534 532 530 536 549 555 569 574 588 543 Yomig's Modulus (GPA) 73 73 73 74 74 74 74 74 75 74 Anneaing Temperature (deg C) 609 603 599 603 613 618 628 633 643 636 15 Table 1 (continued ... ) EXAMPLES COMPONENT 41 42 43 44 45 46 47 48 49 50 SiO2 73.5 73 72.5 72 71.5 71 70,5 70.5 70.5 70.5 A120 9.5 10 10.5 11 115 12 12.5 10 9,5 9 B203 0 0 0 0 0 0 0 O. 1 1.5 NaO 12.3 12.3 12.3 12.3 12.3 12.3 123 123 12.3 12.3 K 0 1.1 -1 L.1 1A 1.1 1.1 11 2.1 2.1 2.1 MgO 2.8 2.8 2.8 2.8 2. 2,8 2.8 3.8 3.8 3.8 CaO 0.5 0.5 0.5 0.5 0.5 0.5 03 0.5 0,5 0.5 TiC' 03 03 03 03 0.3 0.3 03 03 0.3 0.3 PROPERTY Density (gecc) 2.407 2.409 2410 2.412 2.413 2.415 2.416 2425 2426 2.426 CTE (x10'-7/degC) 79 79 79 80 80 80 80 79 79 78 Liquidus Viscosity (Log) Poise 6.9 6.8 6.7 6.5 6.4 6.3 6.2 6.7 6.8 6.9 Sain Point (deg C) 546 549 551 554 556 559 562 547 539 531 Ynng's Modulus (GPA) 74 74 7 75 75 75 76 75 75 75 AnnealingTemperature(degc) 644 651 656 656 673 631 688 627 619 612 30 16 Table 1 (continued ...) EXAMLNPLES COMPONENT 51 52 53 54 55 56 57 58 59 60 SiO, 70.5 70.5 705 70.5 70.5 705 70. 70. 705 705 AT8O- .5 23 2.5 10 10 10 10 9 2.5 2.5 B203 2 2.5 3 0.5 0.5 0.5 0.5 1.5 1.; 0. NaO 1213 11.8 113 12.3 12.3 123 11.8 113 11.3 12.8 K2O 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 1.1 MgO 3.8 3-8 3.8 4.3 3.3 2.2 2.8 2.8 28 28 CaO 0.5 0,5 0.5 0 1 1.5 2 2.5 3 3.5 TiO 2 0 0 0.3 0.3 0.3 03 0.3 0.3 03 0.3 PROPERTY Density (gcc) 1427 2.426 2425 2.423 2.427 2.429 2432 2A36 2440 2445 CTE (10-7/degC) 78 75 3 79 20 80 79 76 77 83 Liquidus Viscosity (Logn) Poise 7.0 6.9 69 6.9 6.5 6.2 6.0 6.0 6.0 6.1 Strain Point (deg C) 524 521 512 552 542 537 541 530 530 546 Young's Moaus (GPA) 75 76 76 75 75 75 75 75 75 75 Anneaing Temperture (deg C) 605 612 618 621 632 638 651 650 649 662 15 Table 1 (continued .. ) COMPONENT 61 62 63 64 65 66 67 'SiC 70.5 70.5 70,5 70.5 70.5 70.5 70. At0 3 8.5 10 10 10 8.4 8 7.7 20 B203 0.3 0.3 03 0.5 0.5 0.5 0.3 Na,0 12.8 11.8 11.3 10.6 11.8 11.8 11.8 K2O 11 2.6 3.1 3.8 43 4.8 5.1 MgO 2.8 3.8 3.8 3.8 3.2 3.8 3.8 CaO 3.7 0.5 0.5 03; 0.5 03 0. TiO 03 0.3 0.3 0.3 0.2 0.1 01 25 PROPERTY Density (ge) 2447 2.425 2425 2-425 2.410 2411 2A12 CTE (j10^-7/degC) 83 78 76 74 78 78 78 LquiidusViscosity (Logn) Poise 6.0 6.6 6.5 6.4 6.4 6.5 6.5 Strain Point(degC) 549 544 541 536 518 510 505 Youg's Moduus (GPA) 75 75 74 74 73 73 72 30 Annealing Tempernaure (deg C) 664 620 613 604 567 546 534 17 In accordance with the present invention the glass composition comprises TiC 2 from about 0 mol% to about 0.7 moI% and serves as a control parameter for tailoring the refractive index of the glass. 5 In accordance with the present invention the sum of mol% of B 2 0 3 , Na 2 O, K20, MgO and CaO ranges from about 14.5 mol% to about 21.7 mol%, wherein the oxides B203, Na 2 O, K20, MgO and CaO serve as fluxes, the fluxes being used to tailor the melting temperatures suitable for continuous manufacturing process. To achieve the melting 10 temperatures less than 1650DC, the condition is that the sum of moi% of B203, Na 2 0, K20, MgO and CaO be in the range from about 14.5 mol% to about 21.7 mol%, should be met. In accordance with the present invention the sum of mol% of Na 2 O 15 and K20 ranges from about 11.7 mol% to about 16.9 mol%. Alkali metal oxides aids in achieving low liquidus temperatures and low melting temperatures of the glass. The melting temperature is the temperature at which the viscosity of the glass is ... poise. Na 2 0 is used to enable ion exchange, wherein Na 2 O is provided in the concentration ranging from 20 about 10.6 mol% to 14.6 mol%. Potassium oxide (K20) is included to obtain low liquidus temperatures, wherein it is known that K20 decreases the viscosity of the glass even more than Na 2 0. In accordance with the present invention K20 concentration ranges from 18 about 1.1 mol %to 5.1 mol %. However, the sum of the sum of mol% of Na 2 O and K 2 0 ranges from about 11.7 mol% to about 16.9 mol%. In accordance with the present invention the B203 serves as flux that 5 is a component added to reduce the melting temperatures. In accordance with the present invention the sum of mol% of MgO and CaO ranges from about 2.8 mol% to about 6.5 mol%. MgO is the most effective flux in case when the total alkali metal oxide concentration 10 exceeds that of A1 2 0 3 . If the concentration of MgO is low formation of forsterite (Mg2SiO4) takes place, whereas at high concentrations of MgO, the glass may have melting temperature within the desired limit however, the liquidus temperature may become too high, thereby the glass liquidus viscosity may become too low. Addition of at least one of 15 CaO or B203 reduces the liquidus temperature of the MgO containing compositions. In accordance with the present invention the sum of mol% of SiO 2 and A1 2 0 3 ranges from about 78.1 mol% to about 85.5 mol%. Presence 20 of A1 2 0 3 ensures enhancement of the glass viscosity. Higher concentrations of A1 2 0 3 may lead to very high glass viscosity along with very high liquidus temperatures, which are controlled by providing total concentration of alkali (sum of Na 2 O and K 2 0) greater than the 19 concentration of A1 2 0 3 . In accordance with the present invention the SiO 2 content is high to reduce the overall density of the glass preferably to a value less than about 2.42 g/cm 3 . The increase in melting temperature of glass due to presence of high SiO 2 content is also 5 compensated by provision of Na 2 O and K 2 0. In accordance with the present invention the sum of A1 2 0 3 and B 2 0 3 ranges from about 8.1 mol% to about 12.5 mol%. 10 In accordance with the present invention the ratio of RO/A1 2 0 3 ranges from about 0 to about 0.7, where R represents one of Mg or Ca. In accordance with the present invention the ratio of A 2 0/AI 2 0 3 ranges from about 0 to about 1.8, where A represents one of Na or K. 15 In accordance with the present invention the ratio of B 2 0 3 /Ai 2 0 3 ranges from about 0 to about 0.36. In accordance with one embodiment the substrate glass composition 20 may contain As 2
O
3 in the range from about 0 to about 0.7 mole %, wherein As 2
O
3 is acts as a fining agent and aids in removal of bubbles or gaseous inclusions from the molten glass.
20 In accordance with one embodiment the substrate glass composition may contain Sb 2
O
3 in the range from about 0 to about 0.8 mole %, wherein Sb 2 0 3 also acts as a fining agent and aids in removal of bubbles or gaseous inclusions from the molten glass. 5 In addition to the above mentioned refining agents, metal halides and sodium sulfate can also be used as a refining agent. In accordance with the present invention the cover glass composition 10 has high liquidus viscosity and is light-weight. In accordance with the present invention the cover glass exhibit coefficient of thermal expansion in the range from about 72 x 10-7/rC to about 76 x 10-7/"C. 15 In accordance with the present invention an advantage of the cover glass composition is that it exhibit higher viscosity, typically of the order of 106 poise. 20 In accordance with the present invention the glass is down-drawable or slot drawable.
21 In accordance with the present invention the glass has a density of less than about 2.45 g/cm3, preferably in the range from about 2.3 to about 2.45 g/cm3. 5 In accordance with the present invention the glass has a logarithm of liquidus viscosity in the range from about 6 to about 7.4. In accordance with the present invention the glass has a Young's Modulus in the range from about 72 GPa to about 76 GPa. 10 In accordance with the present invention the glass has an annealing temperature in the range from about 500 0C to about 700 "C. In accordance with the present invention the glass is used for 15 manufacturing cover plate for electronic devices and glass plate. In accordance with the present invention the cover glass has a thickness ranging from about 0.3 mm to about 2 mm, preferably in the range from about 0.3 mm to about 1.1 mm and most preferably in the 20 range from about 0.4 mm to about 0.5 mm. In accordance with the present invention the glass is capable of being chemically strengthened by ion exchange and exhibits a 22 composition which can be formed by any of the forming processes known in the prior art including the down-draw process, the float glass process, the slot draw process, the press-formable process, the roller press process etc. In accordance with the present invention the ion 5 exchange is a process wherein the glass is strengthened by ion exchange processes, wherein the glass sheet formed is treated chemically with salt bath comprising KNO 3 for a time period of about 5 hours or more and at a temperature of 400 DC or more. 10 In accordance with the present invention the glass may be ion exchanged to a depth of 20 pm or more. In another aspect in accordance with the present invention the glass exhibits a compressive stress of at least 100 MPa, a depth of layer of at 15 least 20 pm and a thickness of at least 0.3 mm when the ion exchange process is carried out in the manner described herein above. The compressive stress is the stress caused by substitution during the chemical strengthening of an alkali metal ion contained in the glass sheet surface layer by an alkali metal ion having larger ionic radius. 20 In one embodiment potassium ions are substituted for sodium ions in the surface layers and the glass sheet is observed to exhibit a compressive stress of at least about 100 MPa.
23 The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the 5 generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the 10 embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
Claims (3)
1. A glass comprising: SiO 2 from about 70.5 mol% to about 77 mol%; A1 2 0 3 from about 8.5 mol% to about 12.5 mol%; 5 B 2 0 3 from about 0 mo% to about 3 mo%; Na 2 0 from about 10.6 mol% to about 14.6 mol%; K20 from about 1.1 mol% to about 5.1 mol%; MgO from about 2.8 mol% to about 5.8 mol%; CaO from about 0 mol% to about 3.7 mol%; 10 optionally TiO 2 from about 0 mol% to about 0.7 mol%; optionally As 2 O 3 in the range from about 0 mol% to about 0.7 mol%; optionally Sb 2 0 3 in the range from about 0 mol% to about 0.8 mol%; 15 optionally at least one metal halide or sodium sulphate as a refining agent;
2. The glass as claimed in claim 1, wherein the glass composition satisfies at least one of the following conditions : 20 mol % of SiO 2 is varied in the range from about 70.5 mol % to about 77 mol % so that the density of the glass is less than 2.45 g/cm 3 , and preferably in the range from about 2.3 to about 2.45 g/cm 3 I the sum of mol% of B 2 0 3 , Na 2 0, K20, MgO and CaO ranges from 25 about 14.5 mol% to about 21.7 mol%; the sum of mol% of Na 2 O and K20 ranges from about 11.7 mol% to about 16.9 mol%; the sum of mol% of MgO and CaO ranges from about 2.8 mol% to about 6.5 mol%; 25 the sum of mol% of SiO 2 and A1 2 0 3 ranges from about 78.1 mol% to about 85.5 mol%; the sum of A1 2 0 3 and B 2 0 3 ranges from about 8.1 mol% to about
12.5 mol%; 5 the ratio of RO/A1 2 0 3 ranges from about 0 to about 0.7, where R represents one of Mg or Ca; the ratio of A 2 0/A1 2 0 3 ranges from about 0 to about 1.8, where A represents one of Na or K; the ratio of B 2 03/Al 2 0 3 ranges from about 0 to about 0.36; 10 the coefficient of thermal expansion of the glass ranges from about 72 x 10-7/ OC to about 76 x 10- 7 /rC; the glass having a logarithm of liquidus viscosity in the range from about 6 to about 7.4; the glass having a Young's Modulus in the range from about 72 15 GPA to about 76 GPA; the glass having an annealing temperature in the range from about 500 *C to about 700 0 C; and the glass having a thickness ranging from about 0.3 mm to about 2 mm typically from about 0.3 mm to about 1.1 mm and 20 preferably from about 0.4 mm to about 0.5 mm. 3. The glass as claimed in claim 1, wherein the glass is at least one selected from a group consisting of down-drawable glass, slot drawable glass , glass that is press-formable in a mold; glass 25 that is drawable through roller press; glass that is drawable through the float process; glass that is used for manufacturing cover plate for electronic devices and glass that is used for manufacturing glass plate. 26 4. The glass as claimed in claim 1, wherein the glass is ion exchanged and typically when ion exchanged, has a surface compressive stress of at least about 100 MPa or a surface compressive layer of thickness of at least about 20 pm. 5 5. A glass cover plate or a portable electronic device, the portable electronic device comprising a glass cover plate, the glass cover plate comprising the glass composition as claimed in claim 1.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IN2012/000185 WO2013030848A1 (en) | 2011-08-26 | 2012-03-19 | Glass composition for strengthened cover glass |
| CN201280021762.9A CN103534216A (en) | 2011-08-26 | 2012-03-19 | Glass composition for strengthened cover glass |
| KR1020137018818A KR20140057474A (en) | 2011-08-26 | 2012-03-19 | Glass composition for strengthened cover glass |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN2390MU2011 | 2011-08-26 | ||
| IN2390/MUM/2011 | 2012-03-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2011101310A4 true AU2011101310A4 (en) | 2011-11-10 |
Family
ID=45465409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2011101310A Ceased AU2011101310A4 (en) | 2011-08-26 | 2011-10-12 | Glass composition for strengthened cover glass |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2014527015A (en) |
| KR (1) | KR20140057474A (en) |
| CN (1) | CN103534216A (en) |
| AU (1) | AU2011101310A4 (en) |
| WO (1) | WO2013030848A1 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150140325A1 (en) * | 2013-11-19 | 2015-05-21 | Corning Incorporated | Ion exchangeable high damage resistance glasses |
| US9953912B2 (en) | 2015-04-28 | 2018-04-24 | Corning Incorporated | Work pieces and methods of laser drilling through holes in substrates using an exit sacrificial cover layer |
| US10329186B2 (en) | 2015-12-21 | 2019-06-25 | Corning Incorporated | Borosilicate glasses with low alkali content |
| CN110845140A (en) * | 2019-10-22 | 2020-02-28 | 惠州市佳美兴玻璃制品有限公司 | Scratch-resistant high-strength screen glass cover plate and preparation method thereof |
| US10756003B2 (en) | 2016-06-29 | 2020-08-25 | Corning Incorporated | Inorganic wafer having through-holes attached to semiconductor wafer |
| US10899653B2 (en) | 2017-01-09 | 2021-01-26 | Corning Incorporated | Ion-exchangeable glass with low coefficient of thermal expansion |
| US11062986B2 (en) | 2017-05-25 | 2021-07-13 | Corning Incorporated | Articles having vias with geometry attributes and methods for fabricating the same |
| US11078112B2 (en) | 2017-05-25 | 2021-08-03 | Corning Incorporated | Silica-containing substrates with vias having an axially variable sidewall taper and methods for forming the same |
| US11114309B2 (en) | 2016-06-01 | 2021-09-07 | Corning Incorporated | Articles and methods of forming vias in substrates |
| US11554984B2 (en) | 2018-02-22 | 2023-01-17 | Corning Incorporated | Alkali-free borosilicate glasses with low post-HF etch roughness |
| US11774233B2 (en) | 2016-06-29 | 2023-10-03 | Corning Incorporated | Method and system for measuring geometric parameters of through holes |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10941071B2 (en) | 2013-08-02 | 2021-03-09 | Corning Incorporated | Hybrid soda-lime silicate and aluminosilicate glass articles |
| US11097974B2 (en) | 2014-07-31 | 2021-08-24 | Corning Incorporated | Thermally strengthened consumer electronic glass and related systems and methods |
| KR102492060B1 (en) | 2016-01-12 | 2023-01-26 | 코닝 인코포레이티드 | Thin thermally and chemically strengthened glass-based articles |
| US20170320769A1 (en) * | 2016-05-06 | 2017-11-09 | Corning Incorporated | Glass compositions that retain high compressive stress after post-ion exchange heat treatment |
| CN111065609A (en) * | 2017-08-24 | 2020-04-24 | 康宁股份有限公司 | Glass with improved tempering capability |
| WO2019099826A1 (en) | 2017-11-17 | 2019-05-23 | Corning Incorporated | Direct graphene transfer and graphene-based devices |
| DE102018116464A1 (en) * | 2018-07-06 | 2020-01-09 | Schott Ag | Chemically toughened, corrosion-resistant glasses |
| CN114514115B (en) | 2019-08-06 | 2023-09-01 | 康宁股份有限公司 | Glass laminate with embedded stress spike for crack prevention and method of making same |
| JP2021024781A (en) * | 2019-08-08 | 2021-02-22 | コーニング インコーポレイテッド | Chemically-strengthenable glasses for laminates |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19616633C1 (en) * | 1996-04-26 | 1997-05-07 | Schott Glaswerke | Chemically toughenable alumino-silicate glass |
| GB2335423A (en) * | 1998-03-20 | 1999-09-22 | Pilkington Plc | Chemically toughenable glass |
| DE102004022629B9 (en) * | 2004-05-07 | 2008-09-04 | Schott Ag | Flooded lithium aluminosilicate flat glass with high temperature resistance, which can be preloaded chemically and thermally and its use |
| DE202009018722U1 (en) * | 2008-02-26 | 2012-11-21 | Corning Inc. | Refining agent for silicate glasses |
-
2011
- 2011-10-12 AU AU2011101310A patent/AU2011101310A4/en not_active Ceased
-
2012
- 2012-03-19 CN CN201280021762.9A patent/CN103534216A/en active Pending
- 2012-03-19 WO PCT/IN2012/000185 patent/WO2013030848A1/en active Application Filing
- 2012-03-19 KR KR1020137018818A patent/KR20140057474A/en not_active Application Discontinuation
- 2012-03-19 JP JP2014526603A patent/JP2014527015A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150140325A1 (en) * | 2013-11-19 | 2015-05-21 | Corning Incorporated | Ion exchangeable high damage resistance glasses |
| US10125044B2 (en) * | 2013-11-19 | 2018-11-13 | Corning Incorporated | Ion exchangeable high damage resistance glasses |
| US11274057B2 (en) | 2013-11-19 | 2022-03-15 | Corning Incorporated | Ion exchangeable high damage resistance glasses |
| US9953912B2 (en) | 2015-04-28 | 2018-04-24 | Corning Incorporated | Work pieces and methods of laser drilling through holes in substrates using an exit sacrificial cover layer |
| US10329186B2 (en) | 2015-12-21 | 2019-06-25 | Corning Incorporated | Borosilicate glasses with low alkali content |
| US11577988B2 (en) | 2015-12-21 | 2023-02-14 | Corning Incorporated | Borosilicate glasses with low alkali content |
| US11114309B2 (en) | 2016-06-01 | 2021-09-07 | Corning Incorporated | Articles and methods of forming vias in substrates |
| US10756003B2 (en) | 2016-06-29 | 2020-08-25 | Corning Incorporated | Inorganic wafer having through-holes attached to semiconductor wafer |
| US11774233B2 (en) | 2016-06-29 | 2023-10-03 | Corning Incorporated | Method and system for measuring geometric parameters of through holes |
| US10899653B2 (en) | 2017-01-09 | 2021-01-26 | Corning Incorporated | Ion-exchangeable glass with low coefficient of thermal expansion |
| US11062986B2 (en) | 2017-05-25 | 2021-07-13 | Corning Incorporated | Articles having vias with geometry attributes and methods for fabricating the same |
| US11078112B2 (en) | 2017-05-25 | 2021-08-03 | Corning Incorporated | Silica-containing substrates with vias having an axially variable sidewall taper and methods for forming the same |
| US11972993B2 (en) | 2017-05-25 | 2024-04-30 | Corning Incorporated | Silica-containing substrates with vias having an axially variable sidewall taper and methods for forming the same |
| US11554984B2 (en) | 2018-02-22 | 2023-01-17 | Corning Incorporated | Alkali-free borosilicate glasses with low post-HF etch roughness |
| CN110845140A (en) * | 2019-10-22 | 2020-02-28 | 惠州市佳美兴玻璃制品有限公司 | Scratch-resistant high-strength screen glass cover plate and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013030848A1 (en) | 2013-03-07 |
| CN103534216A (en) | 2014-01-22 |
| JP2014527015A (en) | 2014-10-09 |
| KR20140057474A (en) | 2014-05-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2011101310A4 (en) | Glass composition for strengthened cover glass | |
| JP7317155B2 (en) | Glass with high surface strength | |
| TWI529150B (en) | Glass for chemical tempering | |
| USRE44869E1 (en) | Down-drawable, chemically strengthened glass for cover plate | |
| TWI534114B (en) | Glass for chemical fortification, glass for chemical fortified glass and display devices | |
| JP7366097B2 (en) | Ion-exchangeable glass with high surface compressive stress | |
| TWI491578B (en) | Method for manufacturing chemically strengthened glass plate | |
| CN110316974A (en) | One kind alumina silicate glass containing alkali and its product, intensifying method and application | |
| EP3110768A1 (en) | High strength antimicrobial glass | |
| WO2009070237A1 (en) | Glasses having improved toughness and scratch resistance | |
| WO2016104446A1 (en) | Glass and chemically strengthened glass | |
| EP3452419A1 (en) | Glass compositions that retain high compressive stress after post-ion exchange heat treatment | |
| JP6222390B2 (en) | Glass for chemical strengthening | |
| KR20120130695A (en) | Method for producing chemically tempered glass | |
| CN118125725A (en) | Chemically strengthened glass and method for producing same | |
| CN116940538A (en) | Method for producing chemically strengthened glass, and chemically strengthened glass |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |