Ion exchangeable glass compositions with improved mechanical durability

Abstract

A glass composition comprising: from 55 mol% to 70 mol% SiO2; from 12.5 mol% to 17.25 mol% of Al2O3; from 0.1 mol% to 3.5 mol% of P2O5; from 0 mol% to 5.5 mol% of B2O3; 6 mol% to 10 mol% of Li2O; 3 mol% to 10 mol% of Na2O; 0 mol% to 3 mol% of TiO2; from 0 mol% to 3 mol% of WO3; and 0 mol% to 3 mol% of Y2O3. The sum of Al2O3 and B2O3 in the glass composition may be from 12.5 mol% to 22.5 mol%. The sum of TiO2, WO3, and Y2O3 in the glass composition may be from 0.2 mol% to 3 mol%.

Description

[0001] This application claims the benefit of priority of U.S. Provisional Application No. 63 / 428,181, filed on Nov. 28, 2022, under 35 U.S.C. § 119, the content of which is incorporated herein by reference in its entirety and made a part hereof. Technical Field

[0002] This specification generally relates to glass compositions, and in particular, to ion-exchangeable glass compositions having improved mechanical durability. Background Art

[0003] Glass articles (e.g., cover glass, glass backplane, housing, etc.) are used in both consumer and commercial electronic devices such as smartphones, tablet computers, portable media players, personal computers, and cameras. The mobile nature of these portable devices makes the devices and the glass articles contained therein particularly vulnerable to damage from accidental drops onto hard surfaces such as the ground. In addition, glass articles (e.g., cover glass) may incorporate "touch" functionality, which requires the glass article to come into contact with various objects, including a user's finger and / or a stylus device. Thus, the glass article must be strong enough to withstand accidental drops and normal contact without damage, such as scratching. In fact, scratches introduced onto the surface of a glass article may reduce the strength of the glass article because the scratches may act as initiation points for cracks, leading to optical interference and catastrophic failure of the glass.

[0004] Accordingly, there is a need for alternative glasses having improved mechanical properties. Summary of the Invention

[0005] According to a first aspect A1, a glass composition may include: SiO2 in an amount greater than or equal to 55 mol% and less than or equal to 70 mol%; Al2O3 in an amount greater than or equal to 12.5 mol% and less than or equal to 17.25 mol%; P2O5 in an amount greater than or equal to 0.1 mol% and less than or equal to 3.5 mol%; B2O3 in an amount greater than or equal to 0 mol% and less than or equal to 5.5 mol%; Li2O in an amount greater than or equal to 6 mol% and less than or equal to 10 mol%; Na2O in an amount greater than or equal to 3 mol% and less than or equal to 10 mol%; TiO2 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%; WO3 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%; and Y2O3 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%, wherein Al2O3 + B2O3 is greater than or equal to 12.5 mol% and less than or equal to 22.5 mol%, and TiO2 + WO3 + Y2O3 is greater than or equal to 0.2 mol% and less than or equal to 3 mol%.

[0006] The second aspect A2 comprises a glass composition according to the first aspect A1, wherein TiO2 + WO3 + Y2O3 is greater than or equal to 0.4 mol% and less than or equal to 3 mol%.

[0007] The third aspect A3 comprises a glass composition according to the first aspect A1 or the second aspect A2, wherein Al2O3 + B2O3 is greater than or equal to 13.5 mol% and less than or equal to 21.5 mol%.

[0008] The fourth aspect A4 comprises a glass composition according to any one of the first aspect A1 to the third aspect A3, wherein the glass composition comprises B2O3 greater than or equal to 0.1 mol% and less than or equal to 5.25 mol%.

[0009] The fifth aspect A5 comprises a glass composition according to any one of the first aspect A1 to the fourth aspect A5, wherein the glass composition comprises Al2O3 greater than or equal to 13 mol% and less than or equal to 17 mol%.

[0010] The sixth aspect A6 comprises a glass composition according to any one of the first aspect A1 to the fifth aspect A5, wherein R2O is greater than or equal to 9 mol% and less than or equal to 20 mol%, and R2O is the sum of Li2O, Na2O and K2O.

[0011] The seventh aspect A7 comprises a glass composition according to any one of the first aspect A1 to the sixth aspect A6, wherein the glass composition comprises K2O greater than 0 mol% and less than or equal to 1 mol%.

[0012] The eighth aspect A8 comprises a glass composition according to any one of the first aspect A1 to the seventh aspect A7, wherein the glass composition comprises MgO greater than 0 mol% and less than or equal to 6.5 mol%.

[0013] The ninth aspect A9 comprises a glass composition according to any one of the first aspect A1 to the eighth aspect A8, wherein the glass composition comprises CaO greater than 0 mol% and less than or equal to 6.5 mol%.

[0014] The tenth aspect A10 comprises a glass composition according to any one of the first aspect A1 to the ninth aspect A9, wherein the glass composition comprises SnO2 greater than 0 mol% and less than or equal to 1 mol%.

[0015] The eleventh aspect A11 comprises a glass composition according to any one of the first aspect A1 to the tenth aspect A10, wherein the glass composition comprises Li2O greater than or equal to 6.5 mol% and less than or equal to 9.5 mol%.

[0016] The twelfth aspect A12 comprises a glass composition according to any one of the first aspect A1 to the eleventh aspect A11, wherein the glass composition comprises Na2O in an amount greater than or equal to 4 mol% and less than or equal to 9.5 mol%.

[0017] The thirteenth aspect A13 comprises a glass composition according to any one of the first aspect A1 to the twelfth aspect A12, wherein the glass composition comprises TiO2 in an amount greater than 0 mol% and less than or equal to 3 mol%.

[0018] The fourteenth aspect A14 comprises a glass composition according to any one of the first aspect A1 to the thirteenth aspect A13, wherein the glass composition comprises WO3 in an amount greater than 0 mol% and less than or equal to 3 mol%.

[0019] The fifteenth aspect A15 comprises a glass composition according to any one of the first aspect A1 to the fourteenth aspect A14, wherein the glass composition comprises Y2O3 in an amount greater than 0 mol% and less than or equal to 3 mol%.

[0020] The sixteenth aspect A16 comprises a glass composition according to any one of the first aspect A1 to the fifteenth aspect A15, wherein the glass composition has a K 1 / 2 fracture toughness of greater than or equal to 0.7 MPa·m as measured by the V-notch short rod method. Ic

[0021] According to the seventeenth aspect A17, a glass article may comprise: SiO2 in an amount greater than or equal to 55 mol% and less than or equal to 70 mol%; Al2O3 in an amount greater than or equal to 12.5 mol% and less than or equal to 17.25 mol%; P2O5 in an amount greater than or equal to 0.1 mol% and less than or equal to 3.5 mol%; B2O3 in an amount greater than or equal to 0 mol% and less than or equal to 5.5 mol%; Li2O in an amount greater than or equal to 6 mol% and less than or equal to 10 mol%; Na2O in an amount greater than or equal to 3 mol% and less than or equal to 10 mol%; TiO2 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%; WO3 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%; and Y2O3 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%, wherein Al2O3 + B2O3 is greater than or equal to 12.5 mol% and less than or equal to 22.5 mol%, and TiO2 + WO3 + Y2O3 is greater than or equal to 0.2 mol% and less than or equal to 3 mol%.

[0022] The eighteenth aspect A18 comprises a glass article according to the seventeenth aspect A17, wherein TiO2 + WO3 + Y2O3 is greater than or equal to 0.4 mol% and less than or equal to 3 mol%.

[0023] Aspect A19 of the nineteenth aspect includes a glass article according to Aspect A17 of the seventeenth aspect or Aspect A18 of the eighteenth aspect, wherein Al2O3 + B2O3 is greater than or equal to 13.5 mol% and less than or equal to 21.5 mol%.

[0024] Aspect A20 of the twentieth aspect includes a glass article according to any one of Aspect A17 of the seventeenth aspect to Aspect A19 of the nineteenth aspect, wherein the glass article includes B2O3 greater than or equal to 0.1 mol% and less than or equal to 5.25 mol%.

[0025] Aspect A21 of the twenty - first aspect includes a glass article according to any one of Aspect A17 of the seventeenth aspect to Aspect A20 of the twentieth aspect, wherein the glass article includes Al2O3 greater than or equal to 13 mol% and less than or equal to 17 mol%.

[0026] Aspect A22 of the twenty - second aspect includes a glass article according to any one of Aspect A17 of the seventeenth aspect to Aspect A21 of the twenty - first aspect, wherein R2O is greater than or equal to 9 mol% and less than or equal to 20 mol%, and R2O is the sum of Li2O, Na2O, and K2O.

[0027] Aspect A23 of the twenty - third aspect includes a glass article according to any one of Aspect A17 of the seventeenth aspect to Aspect A22 of the twenty - second aspect, wherein the glass article includes K2O greater than 0 mol% and less than or equal to 1 mol%.

[0028] Aspect A24 of the twenty - fourth aspect includes a glass article according to any one of Aspect A17 of the seventeenth aspect to Aspect A23 of the twenty - third aspect, wherein the glass article includes MgO greater than 0 mol% and less than or equal to 6.5 mol%.

[0029] Aspect A25 of the twenty - fifth aspect includes a glass article according to any one of Aspect A17 of the seventeenth aspect to Aspect A24 of the twenty - fourth aspect, wherein the glass article includes CaO greater than 0 mol% and less than or equal to 6.5 mol%.

[0030] Aspect A26 of the twenty - sixth aspect includes a glass article according to any one of Aspect A17 of the seventeenth aspect to Aspect A25 of the twenty - fifth aspect, wherein the glass article includes SnO2 greater than 0 mol% and less than or equal to 1 mol%.

[0031] Aspect A27 of the twenty - seventh aspect includes a glass article according to any one of Aspect A17 of the seventeenth aspect to Aspect A26 of the twenty - sixth aspect, wherein the glass article is an ion - exchange glass article.

[0032] Aspect A28 of the twenty - eighth aspect includes a glass article according to Aspect A27 of the twenty - seventh aspect, wherein the ion - exchange glass article includes a peak surface compressive stress greater than or equal to 450 MPa.

[0033] Aspect A29 of the twenty-ninth aspect includes a glass article according to Aspect A27 of the twenty-seventh aspect or Aspect A28 of the twenty-eighth aspect, wherein the ion-exchanged glass article includes a layer depth greater than or equal to 5 μm.

[0034] Aspect A30 of the thirtieth aspect includes a glass article according to any one of Aspects A27 to A29 of the twenty-seventh aspect to the twenty-ninth aspect, wherein the ion-exchanged glass article includes a maximum central tension greater than or equal to 50 MPa measured at an article thickness of 0.8 mm.

[0035] According to Aspect A31 of the thirty-first aspect, a method of forming a glass article may include: heating a glass composition, the glass composition including a glass article, the glass article may include: SiO2 greater than or equal to 55 mol% and less than or equal to 70 mol%; Al2O3 greater than or equal to 12.5 mol% and less than or equal to 17.25 mol%; P2O5 greater than or equal to 0.1 mol% and less than or equal to 3.5 mol%; B2O3 greater than or equal to 0 mol% and less than or equal to 5.5 mol%; Li2O greater than or equal to 6 mol% and less than or equal to 10 mol%; Na2O greater than or equal to 3 mol% and less than or equal to 10 mol%; TiO2 greater than or equal to 0 mol% and less than or equal to 3 mol%; WO3 greater than or equal to 0 mol% and less than or equal to 3 mol%; and Y2O3 greater than or equal to 0 mol% and less than or equal to 3 mol%, wherein Al2O3 + B2O3 is greater than or equal to 12.5 mol% and less than or equal to 22.5 mol%, and TiO2 + WO3 + Y2O3 is greater than or equal to 0.2 mol% and less than or equal to 3 mol%; and cooling the glass composition to form a glass article.

[0036] Aspect A32 of the thirty-second aspect includes the method according to Aspect A31 of the thirty-first aspect, which further includes strengthening the glass article in an ion-exchange bath at a temperature greater than or equal to 350 °C to less than or equal to 500 °C for a period greater than or equal to 1 hour to less than or equal to 24 hours to form an ion-exchanged glass article.

[0037] Aspect A33 of the thirty-third aspect includes the method according to Aspect A32 of the thirty-second aspect, wherein the ion-exchanged glass article includes a peak surface compression stress greater than or equal to 450 MPa.

[0038] Aspect A34 of the thirty-fourth aspect includes the method according to Aspect A32 of the thirty-second aspect or Aspect A33 of the thirty-third aspect, wherein the ion-exchanged glass article includes a depth of a layer greater than or equal to 5 μm.

[0039] Aspect A35 includes a method according to any one of Aspects A32 to A34, wherein the ion-exchanged glass article includes a maximum central tension of greater than or equal to 50 MPa measured at an article thickness of 0.8 mm.

[0040] Aspect A36 includes a method according to any one of Aspects A32 to A35, wherein the ion-exchange bath includes NaNO3.

[0041] Aspect A37 includes a method according to any one of Aspects A32 to A36, wherein the ion-exchange bath includes KNO3.

[0042] According to Aspect 38, a consumer electronic device includes: a housing having a front surface, a rear surface, and side surfaces; and electrical components at least partially disposed within the housing, the electrical components including at least a controller, a memory, and a display, the display being disposed at or near the front surface of the housing; wherein the display includes a glass article according to any one of Aspects A17 to A30.

[0043] Additional features and advantages of the glass compositions described herein will be set forth in the detailed description which follows, and in part will be readily apparent to those skilled in the art from the description or recognized by practicing the embodiments described herein, which include the detailed description, the claims, and the drawings which follow.

[0044] It is to be understood that both the foregoing general description and the following detailed description describe various embodiments and are intended to provide an overview or framework for understanding the nature and characteristics of the claimed subject matter. The drawings are included to provide a further understanding of the various embodiments, and are incorporated into and constitute a part of this specification. The drawings illustrate the various embodiments described herein and, together with the description, serve to explain the principles and operations of the claimed subject matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a plan view of an electronic device incorporating any one of the glass articles according to one or more embodiments described herein; and

[0046] Figure 2 is Figure 1 a perspective view of the electronic device. DETAILED DESCRIPTION

[0047] Reference will now be made in detail to various embodiments of an ion-exchangeable glass composition having improved mechanical durability. According to an embodiment, a glass composition may include: SiO2 in an amount greater than or equal to 55 mol% and less than or equal to 70 mol%; Al2O3 in an amount greater than or equal to 12.5 mol% and less than or equal to 17.25 mol%; P2O5 in an amount greater than or equal to 0.1 mol% and less than or equal to 3.5 mol%; B2O3 in an amount greater than or equal to 0 mol% and less than or equal to 5.5 mol%; Li2O in an amount greater than or equal to 6 mol% and less than or equal to 10 mol%; Na2O in an amount greater than or equal to 3 mol% and less than or equal to 10 mol%; TiO2 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%; WO3 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%; and Y2O3 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%. The sum of Al2O3 and B2O3 in the glass composition and the resulting glass article (i.e., Al2O3 + B2O3) may be from 12.5 mol% to 22.5 mol%. The sum of TiO2, WO3, and Y2O3 in the glass composition and the resulting glass article (i.e., TiO2 + WO3 + Y2O3) may be from 0.2 mol% to 3 mol%. Various embodiments of the ion-exchangeable glass composition and glass articles formed therefrom will be described specifically with reference to the accompanying drawings.

[0048] As used herein, ranges can be expressed as from “about” one particular value and / or to “about” another particular value. When such a range is expressed, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when values are expressed as approximations by use of the antecedent “about,” it will be understood that the particular value forms another embodiment. It should be further understood that each of the endpoints of a range is significant both in relation to the other endpoint and independently of the other endpoint.

[0049] As used herein, directional terms such as up, down, right, left, front, back, top, bottom are made with reference to the drawings as drawn and are not intended to imply absolute orientation.

[0050] Unless otherwise expressly stated, no method set forth herein is intended to be construed as requiring that its steps be performed in a particular order, nor is any apparatus herein intended to be construed as requiring a particular orientation. Accordingly, if a method claim does not actually recite an order to be followed by its steps, or any apparatus claim does not actually recite an order or orientation of individual components, or if the claims or description do not otherwise specifically state that the steps are limited to a particular order, or that the components of the apparatus are in a particular order or orientation, it is not intended that any inference be made in this regard. This applies to any possible non-explicit basis for interpretation, including: logical matters regarding step arrangement, operational flow, component order, or component orientation; plain meaning derived from grammatical organization or punctuation; and the number or type of embodiments described in the specification.

[0051] As used herein, unless the context otherwise clearly indicates, the singular forms “a,” “an,” and “the” include plural referents. Thus, for example, unless the context otherwise clearly indicates, reference to “a” component includes aspects having two or more such components.

[0052] In embodiments of the glass compositions and resulting glass articles described herein, unless otherwise specified, the concentrations of the constituent components (e.g., SiO2, Al2O3, etc.) are specified in mole percent (mol %) based on oxides.

[0053] The term “substantially free of” when used to describe the concentration and / or absence of a particular constituent component in a glass composition and resulting glass article means that the constituent component is not intentionally added to the glass composition and resulting glass article. However, the glass composition and resulting glass article may contain trace amounts of the constituent component as contaminants or tramp, in an amount less than 0.05 weight percent (wt %). As described herein, the remainder of the application specifies the concentration of the constituent component in mol %. For manufacturing purposes, the amount of contaminants or tramp of the constituent component is listed in wt %, and those skilled in the art will understand the amount of contaminants and tramp is listed in wt %.

[0054] The terms “0 mol %” and “free of” when used to describe the concentration and / or absence of a particular constituent component in a glass composition and resulting glass article mean that the constituent component is not present in the glass composition and resulting glass article.

[0055] Fracture toughness (K 1C ) represents the ability of a glass composition to resist fracture. Fracture toughness is measured on non-strengthened glass articles, e.g., K is measured prior to ion exchange treatment of the glass article. 1CValues, thus representing the characteristics of the glass article before ion exchange. The fracture toughness test method described herein is not suitable for glass that has been exposed to ion exchange treatment. However, fracture toughness measurements performed on the same glass article before ion exchange treatment as described herein are related to the fracture toughness after ion exchange treatment and are thus used as is. For measuring K 1C The V-notch short bar (CNSB) method for values is disclosed in Reddy, K.P.R. et al., “Fracture Toughness Measurement of Glass and Ceramic Materials Using Chevron-Notched Specimens,” J. Am. Ceram. Soc., 71[6], C-310-C-313 (1988), with the exception of Y* m Calculated using Equation 5 of Bubsey, R.T. et al., “Closed-Form Expressions for Crack-Mouth Displacement and Stress Intensity Factors for Chevron-Notched Short Bar and Short Rod Specimens Based on Experimental Compliance Measurements,” NASA Technical Memorandum 83796, pp. 1-30 (October 1992). Unless otherwise specified, all fracture toughness values are measured by the V-notch short bar (CNSB) method.

[0056] As described herein, density is measured by the buoyancy method of ASTM C693-93.

[0057] As used herein, the term “strain point” refers to the temperature at which the viscosity of the glass composition is 1×10 14.68 poise as measured according to ASTM C598.

[0058] As used herein, the term “melting point” refers to the temperature at which the viscosity of the glass composition is 200 poise as measured according to ASTM C338.

[0059] As used herein, the term “softening point” refers to the temperature at which the viscosity of the glass composition is 1×10 7.6 poise. The softening point is measured by the parallel plate viscosity method, which measures the viscosity of an inorganic glass from 10 7 to 10 9 poise as a function of temperature, similar to ASTM C1351M.

[0060] As used herein, the term "annealing point" or "effective annealing temperature" refers to the temperature at which the viscosity of a glass composition, measured according to ASTM C598, is 1×10 13.18 poise.

[0061] As described herein, the elastic modulus (also known as Young's modulus) of a glass composition is provided in gigapascals (GPa) and is measured according to ASTM C623.

[0062] As described herein, the shear modulus of a glass composition is provided in gigapascals (GPa). The shear modulus of a glass composition is measured according to ASTM C623.

[0063] As described herein, Poisson's ratio is measured according to ASTM C623.

[0064] As described herein, the refractive index is measured according to ASTM E1967.

[0065] The surface compressive stress is measured using a surface stress meter (FSM), such as a commercially available instrument, such as the FSM-6000 manufactured by Orihara Industrial Co., Ltd. (Japan). The surface stress measurement relies on the measurement of the stress-optical coefficient (SOC) associated with the birefringence of the glass article. The SOC is in turn measured according to Procedure C (glass disk method) of the Standard Test Method for Measurement of Glass Stress-Optical Coefficient, described in ASTM Standard C770-16, the content of which is incorporated herein by reference in its entirety. Unless otherwise indicated, the value of the surface compressive stress (CS) reported herein refers to the peak surface compressive stress. The maximum central tension (CT) value is measured using the SCALP technique known in the art. Unless otherwise indicated, the value of the central tension (CT) reported herein refers to the maximum central tension.

[0066] According to the convention commonly used in the art, compression or compressive stress (CS) is expressed as a negative (i.e., <0) stress, and tension or tensile stress is expressed as a positive (i.e., >0) stress. However, throughout this specification, CS is expressed as a positive value or absolute value (i.e., as recited herein, CS = |CS|).

[0067] As used herein, "depth of layer" (DOL) refers to the depth into a glass article to which metal oxide ions diffuse into the glass article, at which depth the ion concentration reaches a minimum. The DOL can be measured using electron probe microanalysis (EPMA).

[0068] As used herein, the term "Vogel-Fulcher-Tamman ('VFT') relationship" describes the temperature dependence of viscosity and is represented by the following equation:

[0069]

[0070] where η is the viscosity. To determine VFT A, VFT B, and VFT T o , the viscosity of the glass composition is measured over a given temperature range. The raw data of viscosity versus temperature is then fitted to the VFT equation by least squares fitting to obtain A, B, and T o . Using these values, the viscosity points at any temperature above the softening point can be calculated (e.g., 200P temperature, 35000P temperature, and 200000P temperature).

[0071] As used herein, the term "liquidus viscosity" refers to the viscosity of the glass composition at the onset of devitrification (i.e., at the liquidus temperature determined by the gradient furnace method according to ASTM C829-81).

[0072] As used herein, the term "liquidus temperature" refers to the temperature at which the glass composition begins to devitrify as determined by the gradient furnace method according to ASTM C829-81.

[0073] Chemical strengthening processes have been used to achieve high strength and high toughness in alkali silicate glasses. The fragility limit of chemically strengthened glasses is typically controlled by the fracture toughness of the glass components. Silicon dioxide has a relatively low K 1 / 2 of about 0.7 MPa·m Ic fracture toughness, which limits the K Ic fracture toughness of silicate glasses to a value of about 0.7 MPa·m 1 / 2 . Specific oxides can increase the fracture toughness (e.g., ZrO2, Ta2O5, TiO2, HfO2, La2O3, Y2O3, and WO3). However, such oxides can be expensive, thereby increasing the cost of the glass articles formed from the glass composition.

[0074] The addition of Al2O3 can increase the fracture toughness of the glass composition but can result in a decrease in the liquidus viscosity, making it difficult to form the glass composition. The addition of B2O3 can also improve the fracture toughness of the glass composition. However, the presence of B2O3 may reduce the achievable central tension of the glass composition after ion exchange strengthening and may cause volatilization problems during the melting and forming processes.

[0075] The present disclosure relates to glass compositions and glass articles formed therefrom that mitigate the above problems. Specifically, the glass compositions and resulting glass articles disclosed herein include a relatively high total of alkali metal oxides (i.e., Li2O and Na2O), Al2O3, and B2O3 (e.g., Al2O3 + B2O3 is greater than or equal to 12.5 mol %), and a relatively high total of TiO2, WO3, and Y2O3 (e.g., TiO2 + WO3 + Y2O3 is greater than or equal to 0.2 mol %), which results in an ion-exchangeable glass composition having improved fracture toughness.

[0076] The glass compositions and resulting glass articles described herein can be described as aluminosilicate glass compositions and articles and include SiO2 and Al2O3. The glass compositions and resulting glass articles described herein also contain TiO2, WO3, and / or Y2O3 to increase fracture toughness. The glass compositions and resulting glass articles described herein also contain alkali metal oxides, such as Li2O and Na2O, to achieve ion-exchangeability of the glass composition. The glass compositions and resulting glass articles described herein also contain P2O5 to improve the efficiency of the ion-exchange process.

[0077] SiO2 is the primary glass former in the glass compositions described herein and can be used to stabilize the network structure of the glass article. The concentration of SiO2 in the glass composition and resulting glass article should be high enough (e.g., greater than or equal to 55 mol %) to provide basic glass-forming ability. The amount of SiO2 can be limited (e.g., less than or equal to 70 mol %) to control the melting point of the glass composition, as the melting temperature of pure SiO2 or high-SiO2 glass is undesirably high. Thus, limiting the concentration of SiO2 can help improve the fusibility and formability of the resulting glass article.

[0078] Thus, in embodiments, the glass composition and the resulting glass article can include from greater than or equal to 55 mol% to less than or equal to 70 mol% SiO2. In embodiments, the concentration of SiO2 in the glass composition and the resulting glass article can be greater than or equal to 55 mol%, greater than or equal to 57 mol%, or even greater than or equal to 59 mol%. In embodiments, the concentration of SiO2 in the glass composition and the resulting glass article can be less than or equal to 70 mol%, less than or equal to 67 mol%, less than or equal to 65 mol%, or even less than or equal to 63 mol%. In embodiments, the concentration of SiO2 in the glass composition and the resulting glass article can be from greater than or equal to 55 mol% to less than or equal to 70 mol%, from greater than or equal to 55 mol% to less than or equal to 67 mol%, from greater than or equal to 55 mol% to less than or equal to 65 mol%, from greater than or equal to 55 mol% to less than or equal to 63 mol%, from greater than or equal to 57 mol% to less than or equal to 70 mol%, from greater than or equal to 57 mol% to less than or equal to 67 mol%, from greater than or equal to 57 mol% to less than or equal to 65 mol%, from greater than or equal to 57 mol% to less than or equal to 63 mol%, from greater than or equal to 59 mol% to less than or equal to 70 mol%, from greater than or equal to 59 mol% to less than or equal to 67 mol%, from greater than or equal to 59 mol% to less than or equal to 65 mol%, or even from greater than or equal to 59 mol% to less than or equal to 63 mol%, or any and all sub-ranges formed by any of these endpoints.

[0079] Similar to SiO2, Al2O3 can also stabilize the glass network and additionally provide improved mechanical properties and chemical durability to the resulting glass article. The amount of Al2O3 can also be tailored to control the viscosity of the glass composition. The concentration of Al2O3 should be high enough (e.g., greater than or equal to 12.5 mol%) such that the glass composition and the resulting glass article have a desired fracture toughness (e.g., greater than or equal to 0.7 MPa·m 1 / 2)。However, if the amount of Al2O3 is too high (e.g., greater than 17.25 mol%), the viscosity of the melt may increase, thereby reducing the formability of the glass composition. In embodiments, the glass composition and the resulting glass article may include from greater than or equal to 12.5 mol% to less than or equal to 17.25 mol% Al2O3. In embodiments, the glass composition and the resulting glass article may include from greater than or equal to 13 mol% to less than or equal to 17 mol% Al2O3. In embodiments, the concentration of Al2O3 in the glass composition and the resulting glass article may be greater than or equal to 12.5 mol%, greater than or equal to 13 mol%, greater than or equal to 13.5 mol% or even greater than or equal to 14 mol%. In embodiments, the concentration of Al2O3 in the glass composition and the resulting glass article may be less than or equal to 17.25 mol%, less than or equal to 17 mol%, less than or equal to 16.5 mol% or even less than or equal to 16 mol%. In embodiments, the concentration of Al2O3 in the glass composition and the resulting glass article may be from greater than or equal to 12.5 mol% to less than or equal to 17.25 mol%, from greater than or equal to 12.5 mol% to less than or equal to 17 mol%, from greater than or equal to 12.5 mol% to less than or equal to 16.5 mol%, from greater than or equal to 12.5 mol% to less than or equal to 16 mol%, from greater than or equal to 13 mol% to less than or equal to 17.25 mol%, from greater than or equal to 13 mol% to less than or equal to 17 mol%, from greater than or equal to 13 mol% to less than or equal to 16.5 mol%, from greater than or equal to 13 mol% to less than or equal to 16 mol%, from greater than or equal to 13.5 mol% to less than or equal to 17.25 mol%, from greater than or equal to 13.5 mol% to less than or equal to 17 mol%, from greater than or equal to 13.5 mol% to less than or equal to 16.5 mol%, from greater than or equal to 13.5 mol% to less than or equal to 16 mol%, from greater than or equal to 14 mol% to less than or equal to 17.25 mol%, from greater than or equal to 14 mol% to less than or equal to 17 mol%, from greater than or equal to 14 mol% to less than or equal to 16.5 mol% or even from greater than or equal to 14 mol% to less than or equal to 16 mol%, or any and all subranges formed by any of these endpoints.

[0080] Similar to SiO2 and Al2O3, P2O5 can be added as a network former to the glass composition and the resulting glass article, thereby reducing the fusibility and formability of the glass composition. Accordingly, P2O5 can be added in an amount that does not overly reduce these properties. The addition of P2O5 can also increase the diffusivity of ions in the glass article during ion exchange processing, thereby enhancing the efficiency of these processes. In an embodiment, the glass composition and the resulting glass article can include from greater than or equal to 0.1 mol% to less than or equal to 3.5 mol% P2O5. In an embodiment, the concentration of P2O5 in the glass composition and the resulting glass article can be greater than or equal to 0.1 mol%, greater than or equal to 0.25 mol%, greater than or equal to 0.5 mol% or even greater than or equal to 1 mol%. In an embodiment, the concentration of P2O5 in the glass composition and the resulting glass article can be less than or equal to 3.5 mol%, less than or equal to 3 mol%, less than or equal to 2.5 mol% or even less than or equal to 2 mol%. In an embodiment, the concentration of P2O5 in the glass composition and the resulting glass article can be from greater than or equal to 0.1 mol% to less than or equal to 3.5 mol%, from greater than or equal to 0.1 mol% to less than or equal to 3 mol%, from greater than or equal to 0.1 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0.1 mol% to less than or equal to 2 mol%, from greater than or equal to 0.25 mol% to less than or equal to 3.5 mol%, from greater than or equal to 0.25 mol% to less than or equal to 3 mol%, from greater than or equal to 0.25 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0.25 mol% to less than or equal to 2 mol%, from greater than or equal to 0.5 mol% to less than or equal to 3.5 mol%, from greater than or equal to 0.5 mol% to less than or equal to 3 mol%, from greater than or equal to 0.5 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0.5 mol% to less than or equal to 2 mol%, from greater than or equal to 1 mol% to less than or equal to 3.5 mol%, from greater than or equal to 1 mol% to less than or equal to 3 mol%, from greater than or equal to 1 mol% to less than or equal to 2.5 mol% or even from greater than or equal to 1 mol% to less than or equal to 2 mol%, or any and all subranges formed by any of these endpoints.

[0081] The glass compositions and resulting glass articles described herein may further include B2O3. B2O3 reduces the melting temperature of the glass composition. Additionally, B2O3 can also improve the damage resistance of the resulting glass article. When the boron in the glass article is not charge balanced by an alkali metal oxide or divalent cation oxide (such as MgO and CaO), the boron will be in a trigonal coordination state (or three - coordinated boron), which opens up the structure of the glass. The network around these three - coordinated boron atoms is less rigid than that of tetrahedrally - coordinated (or four - coordinated) boron. Without being bound by theory, it is believed that compared to four - coordinated boron, a glass composition containing three - coordinated boron can allow a certain degree of deformation before crack formation. By allowing some deformation, the Vickers indentation crack initiation threshold increases. The fracture toughness of a glass composition containing three - coordinated boron can also increase. B2O3 can be included in the glass composition and resulting glass article to improve the formability of the glass composition and resulting glass article and increase the fracture toughness. However, if the concentration of B2O3 is too high, the chemical durability and liquidus viscosity may decrease, and the volatilization and evaporation of B2O3 during melting become difficult to control. In addition, it has been found that the addition of boron significantly reduces the diffusivity of alkali ions in the glass article, which in turn adversely affects the ion - exchange properties of the resulting glass. In particular, it has been found that, relative to a boron - free glass composition, the addition of boron significantly increases the time required to achieve a given CT. Thus, the amount of B2O3 can be limited (e.g., less than or equal to 5.5 mol%) to maintain the chemical durability, manufacturability of the glass composition, and the desired ion - exchangeability of the glass article.

[0082] In embodiments, the glass composition and the resulting glass article can include from greater than or equal to 0 mol% to less than or equal to 5.5 mol% B2O3. In embodiments, the glass composition and the resulting glass article can include from greater than or equal to 0.1 mol% to less than or equal to 5.25 mol% B2O3. In embodiments, the concentration of B2O3 in the glass composition and the resulting glass article can be greater than or equal to 0 mol%, greater than or equal to 0.1 mol%, greater than or equal to 0.25 mol%, greater than or equal to 0.5 mol%, greater than or equal to 1 mol% or even greater than or equal to 2 mol%. In embodiments, the concentration of B2O3 in the glass composition and the resulting glass article can be less than or equal to 5.5 mol%, less than or equal to 5.25 mol%, less than or equal to 5 mol%, less than or equal to 4.5 mol%, less than or equal to 4 mol%, less than or equal to 3.5 mol% or even less than or equal to 3 mol%.In embodiments, the concentration of B2O3 in the glass composition and the resulting glass article can be greater than or equal to 0 mol% and less than or equal to 5.5 mol%, greater than or equal to 0 mol% and less than or equal to 5.25 mol%, greater than or equal to 0 mol% and less than or equal to 5 mol%, greater than or equal to 0 mol% and less than or equal to 4.5 mol%, greater than or equal to 0 mol% and less than or equal to 4 mol%, greater than or equal to 0 mol% and less than or equal to 3.5 mol%, greater than or equal to 0 mol% and less than or equal to 3 mol%, greater than or equal to 0.25 mol% and less than or equal to 5.5 mol%, greater than or equal to 0.25 mol% and less than or equal to 5.25 mol%, greater than or equal to 0.25 mol% and less than or equal to 5 mol%, greater than or equal to 0.25 mol% and less than or equal to 4.5 mol%, greater than or equal to 0.25 mol% and less than or equal to 4 mol%, greater than or equal to 0.25 mol% and less than or equal to 3.5 mol%, greater than or equal to 0.25 mol% and less than or equal to 3 mol%, greater than or equal to 0.5 mol% and less than or equal to 5.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 5.25 mol%, greater than or equal to 0.5 mol% and less than or equal to 5 mol%, greater than or equal to 0.5 mol% and less than or equal to 4.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 4 mol%, greater than or equal to 0.5 mol% and less than or equal to 3.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 3 mol%, greater than or equal to 1 mol% and less than or equal to 5.25 mol%, greater than or equal to 1 mol% and less than or equal to 5 mol%, greater than or equal to 1 mol% and less than or equal to 4.5 mol%, greater than or equal to 1 mol% and less than or equal to 4 mol%, greater than or equal to 1 mol% and less than or equal to 3.5 mol%, greater than or equal to 1 mol% and less than or equal to 3 mol%, greater than or equal to 2 mol% and less than or equal to 5.5 mol%, greater than or equal to 2 mol% and less than or equal to 5.25 mol%, greater than or equal to 2 mol% and less than or equal to 5 mol%, greater than or equal to 2 mol% and less than or equal to 4.5 mol%, greater than or equal to 2 mol% and less than or equal to 4 mol%, greater than or equal to 2 mol% and less than or equal to 3.5 mol%, or even greater than or equal to 2 mol% and less than or equal to 3 mol%, or any and all subranges formed by any of these endpoints. In embodiments, the glass composition and the resulting glass article can be free or substantially free of B2O3.

[0083] The glass compositions and resulting glass articles described herein contain relatively high concentrations of Al2O3 and B2O3, which can increase the fracture toughness of the glass compositions and resulting glass articles. In embodiments, the total concentration or sum of Al2O3 and B2O3 in the glass compositions and resulting glass articles (i.e., Al2O3 (mol%) + B2O3 (mol%)) can be greater than or equal to 12.5 mol% to provide enhanced fracture toughness. The total concentration of Al2O3 and B2O3 in the glass compositions and resulting glass articles can be limited (e.g., less than or equal to 22.5 mol%) to control the liquidus temperature of the glass compositions, because an increase in the total concentration of Al2O3 and B2O3 can increase the liquidus temperature. The increased liquidus temperature reduces the liquidus viscosity and stability of the glass compositions, such that the glass compositions may no longer be suitable for down-draw or fusion forming processes.

[0084] In an embodiment, the total concentration of Al2O3 and B2O3 in the glass composition and the resulting glass article can be greater than or equal to 12.5 mol% and less than or equal to 22.5 mol%. In an embodiment, the total concentration of Al2O3 and B2O3 in the glass composition and the resulting glass article can be greater than or equal to 13 mol% and less than or equal to 22 mol%. In an embodiment, the total concentration of Al2O3 and B2O3 in the glass composition and the resulting glass article can be greater than or equal to 12.5 mol%, greater than or equal to 13.5 mol%, greater than or equal to 14.5 mol% or even greater than or equal to 15.5 mol%. In an embodiment, the total concentration of Al2O3 and B2O3 in the glass composition and the resulting glass article can be less than or equal to 22.5 mol%, less than or equal to 21.5 mol%, less than or equal to 20.5 mol%, less than or equal to 19.5 mol% or even less than or equal to 18.5 mol%. In an embodiment, the concentration amounts of Al2O3 and B2O3 in the glass composition and the resulting glass article can be greater than or equal to 12.5 mol% and less than or equal to 22.5 mol%, greater than or equal to 12.5 mol% and less than or equal to 21.5 mol%, greater than or equal to 12.5 mol% and less than or equal to 20.5 mol%, greater than or equal to 12.5 mol% and less than or equal to 19.5 mol%, greater than or equal to 12.5 mol% and less than or equal to 18.5 mol%, greater than or equal to 13.5 mol% and less than or equal to 22.5 mol%, greater than or equal to 13.5 mol% and less than or equal to 21.5 mol%, greater than or equal to 13.5 mol% and less than or equal to 20.5 mol%, greater than or equal to 13.5 mol% and less than or equal to 19.5 mol%, greater than or equal to 13.5 mol% and less than or equal to 18.5 mol%, greater than or equal to 14.5 mol% and less than or equal to 22.5 mol%, greater than or equal to 14.5 mol% and less than or equal to 21.5 mol%, greater than or equal to 14.5 mol% and less than or equal to 20.5 mol%, greater than or equal to 14.5 mol% and less than or equal to 19.5 mol%, greater than or equal to 14.5 mol% and less than or equal to 18.5 mol%, greater than or equal to 15.5 mol% and less than or equal to 22.5 mol%, greater than or equal to 15.5 mol% and less than or equal to 21.5 mol%, greater than or equal to 15.5 mol% and less than or equal to 20.5 mol%, greater than or equal to 15.5 mol% and less than or equal to 19.5 mol% or even greater than or equal to 15.5 mol% and less than or equal to 18.5 mol%, or any and all sub-ranges formed by any one of these endpoints.

[0085] As described above, the glass composition can contain alkali metal oxides, such as Li2O and Na2O, to achieve the ion-exchangeability of the glass composition. Li2O contributes to the ion-exchangeability of the glass composition and also reduces the softening point of the glass composition, thereby increasing the formability of the glass. In an embodiment, the glass composition and the resulting glass article can include from greater than or equal to 6 mol% to less than or equal to 10 mol% Li2O. In an embodiment, the glass composition and the resulting glass article can include from greater than or equal to 6.5 mol% to less than or equal to 9.5 mol% Li2O. In an embodiment, the concentration of Li2O in the glass composition and the resulting glass article can be greater than or equal to 6 mol%, greater than or equal to 6.5 mol%, greater than or equal to 7 mol%, greater than or equal to 7.5 mol% or even greater than or equal to 8 mol%. In an embodiment, the concentration of Li2O in the glass composition and the resulting glass article can be less than or equal to 10 mol%, less than or equal to 9.5 mol% or even less than or equal to 9 mol%. In an embodiment, the concentration of Li2O in the glass composition and the resulting glass article can be from greater than or equal to 6 mol% to less than or equal to 10 mol%, from greater than or equal to 6 mol% to less than or equal to 9.5 mol%, from greater than or equal to 6 mol% to less than or equal to 9 mol%, from greater than or equal to 6.5 mol% to less than or equal to 10 mol%, from greater than or equal to 6.5 mol% to less than or equal to 9.5 mol%, from greater than or equal to 6.5 mol% to less than or equal to 9 mol%, from greater than or equal to 7 mol% to less than or equal to 10 mol%, from greater than or equal to 7 mol% to less than or equal to 9.5 mol%, from greater than or equal to 7 mol% to less than or equal to 9 mol%, from greater than or equal to 7.5 mol% to less than or equal to 10 mol%, from greater than or equal to 7.5 mol% to less than or equal to 9.5 mol%, from greater than or equal to 7.5 mol% to less than or equal to 9 mol%, from greater than or equal to 8 mol% to less than or equal to 10 mol%, from greater than or equal to 8 mol% to less than or equal to 9.5 mol% or even from greater than or equal to 8 mol% to less than or equal to 9 mol%, or any and all subranges formed by any one of these endpoints.

[0086] In addition to contributing to the ion-exchangeability of the glass composition, Na2O also lowers the melting point and improves the formability of the glass composition. However, if too much Na2O is added to the glass composition, the melting point may be too low. Thus, in embodiments, the concentration of Li2O present in the glass composition and the resulting glass article can be greater than the concentration of Na2O present in the glass composition and the resulting glass article. In embodiments, the glass composition and the resulting glass article can include from greater than or equal to 3 mol% to less than or equal to 10 mol% Na2O. In embodiments, the glass composition and the resulting glass article can include from greater than or equal to 3.5 mol% to less than or equal to 9.5 mol% Na2O. In embodiments, the concentration of Na2O in the glass composition and the resulting glass article can be greater than or equal to 3 mol%, greater than or equal to 4 mol%, greater than or equal to 5 mol%, greater than or equal to 6 mol% or even greater than or equal to 7 mol%. In embodiments, the concentration of Na2O in the glass composition and the resulting glass article can be less than or equal to 10 mol%, less than or equal to 9.5 mol% or even less than or equal to 9 mol%. In embodiments, the concentration of Na2O in the glass composition and the resulting glass article can be greater than or equal to 3 mol% and less than or equal to 10 mol%, greater than or equal to 3 mol% and less than or equal to 9.5 mol%, greater than or equal to 3 mol% and less than or equal to 9 mol%, greater than or equal to 4 mol% and less than or equal to 10 mol%, greater than or equal to 4 mol% and less than or equal to 9.5 mol%, greater than or equal to 4 mol% and less than or equal to 9 mol%, greater than or equal to 5 mol% and less than or equal to 10 mol%, greater than or equal to 5 mol% and less than or equal to 9.5 mol%, greater than or equal to 5 mol% and less than or equal to 9 mol%, greater than or equal to 6 mol% and less than or equal to 10 mol%, greater than or equal to 6 mol% and less than or equal to 9.5 mol%, greater than or equal to 6 mol% and less than or equal to 9 mol%, greater than or equal to 7 mol% and less than or equal to 10 mol%, greater than or equal to 7 mol% and less than or equal to 9.5 mol% or even greater than or equal to 7 mol% and less than or equal to 9 mol%, or any and all subranges formed by any of these endpoints.

[0087] The glass compositions and resulting glass articles described herein may further include alkali metal oxides other than Li2O and Na2O, such as K2O. When K2O is included, K2O promotes ion exchange and can increase the layer depth and lower the melting point to improve the formability of the glass composition. However, adding too much K2O may result in an undesirably low surface compressive stress and melting point. Accordingly, in embodiments, the amount of K2O added to the glass composition and resulting glass articles may be limited. In embodiments, the glass composition and resulting glass articles may include greater than 0 mol% and less than or equal to 1 mol% K2O. In embodiments, the concentration of K2O in the glass composition and resulting glass articles may be greater than or equal to 0 mol% or even greater than or equal to 0.1 mol%. In embodiments, the concentration of K2O in the glass composition and resulting glass articles may be less than or equal to less than or equal to 1 mol% or even less than or equal to 0.5 mol%. In embodiments, the concentration of K2O in the glass composition and resulting glass articles may be greater than or equal to 0 mol% and less than or equal to 1 mol%, greater than or equal to 0 mol% and less than or equal to 0.5 mol%, greater than or equal to 0.1 mol% and less than or equal to 1 mol% or even greater than or equal to 0.1 mol% and less than or equal to 0.5 mol%, or any and all subranges formed by any of these endpoints. In embodiments, the glass composition and resulting glass articles may be free or substantially free of K2O.

[0088] R2O is the sum (in mol%) of Li2O, Na2O, and K2O present in the glass composition and resulting glass articles (i.e., R2O = Li2O (mol%) + Na2O (mol%) + K2O (mol%)). Similar to B2O3, these alkali metal oxides contribute to lowering the softening point and molding temperature of the glass composition, thereby offsetting the increase in the softening point and molding temperature of the glass composition caused by, for example, a relatively high amount of SiO2 in the glass composition. The softening point and molding temperature can be further reduced by including a combination of alkali metal oxides (e.g., two or more alkali metal oxides) in the glass composition, a phenomenon known as the "mixed alkali effect." However, it has been found that if the amount of alkali metal oxides is too high, the average coefficient of thermal expansion of the glass composition increases to greater than 100×10 -7 / °C, which may be undesirable.

[0089] In an embodiment, the concentration of R2O in the glass composition and the resulting glass article can be greater than or equal to 9 mol% and less than or equal to 20 mol%. In an embodiment, the concentration of R2O in the glass composition and the resulting glass article can be greater than or equal to 9 mol%, greater than or equal to 11 mol%, greater than or equal to 13 mol% or even greater than or equal to 15 mol%. In an embodiment, the concentration of R2O in the glass composition and the resulting glass article can be less than or equal to 20 mol%, less than or equal to 19 mol% or even less than or equal to 18 mol%. In an embodiment, the concentration of R2O in the glass composition and the resulting glass article can be greater than or equal to 9 mol% and less than or equal to 20 mol%, greater than or equal to 9 mol% and less than or equal to 19 mol%, greater than or equal to 9 mol% and less than or equal to 18 mol%, greater than or equal to 11 mol% and less than or equal to 20 mol%, greater than or equal to 11 mol% and less than or equal to 19 mol%, greater than or equal to 11 mol% and less than or equal to 18 mol%, greater than or equal to 13 mol% and less than or equal to 20 mol%, greater than or equal to 13 mol% and less than or equal to 19 mol%, greater than or equal to 13 mol% and less than or equal to 18 mol%, greater than or equal to 15 mol% and less than or equal to 20 mol%, greater than or equal to 15 mol% and less than or equal to 19 mol% or even greater than or equal to 15 mol% and less than or equal to 18 mol%, or any and all subranges formed by any of these endpoints.

[0090] The glass compositions and resulting glass articles described herein contain relatively high concentrations of TiO2, WO3, and Y2O3, which can increase the fracture toughness of the glass compositions and resulting glass articles. In an embodiment, the total concentration or sum of TiO2, WO3, and Y2O3 in the glass composition and the resulting glass article (i.e., TiO2 (mol%) + WO3 (mol%) + Y2O3 (mol%)) can be greater than or equal to 0.2 mol% to provide enhanced fracture toughness. The total concentration of TiO2, WO3, and Y2O3 in the glass composition and the resulting glass article can be limited (e.g., less than or equal to 3 mol%) to limit its cost and ensure the desired liquidus viscosity is achieved.

[0091] In embodiments, the total concentration of TiO2, WO3, and Y2O3 in the glass composition and the resulting glass article can be greater than or equal to 0.2 mol% and less than or equal to 3 mol%. In embodiments, the total concentration of TiO2, WO3, and Y2O3 in the glass composition and the resulting glass article can be greater than or equal to 0.4 mol% and less than or equal to 3 mol%. In embodiments, the total concentration of TiO2, WO3, and Y2O3 in the glass composition and the resulting glass article can be greater than or equal to 0.2 mol%, greater than or equal to 0.4 mol%, greater than or equal to 0.6 mol%, or even greater than or equal to 0.8 mol%. In embodiments, the total concentration of TiO2, WO3, and Y2O3 in the glass composition and the resulting glass article can be less than or equal to 3 mol%, less than or equal to 2.5 mol%, less than or equal to 2 mol%, less than or equal to 1.5 mol%, or even less than or equal to 1 mol%. In embodiments, the total concentration of TiO2, WO3, and Y2O3 in the glass composition and the resulting glass article can be greater than or equal to 0.2 mol% and less than or equal to 3 mol%, greater than or equal to 0.2 mol% and less than or equal to 2.5 mol%, greater than or equal to 0.2 mol% and less than or equal to 2 mol%, greater than or equal to 0.2 mol% and less than or equal to 1.5 mol%, greater than or equal to 0.2 mol% and less than or equal to 1 mol%, greater than or equal to 0.4 mol% and less than or equal to 3 mol%, greater than or equal to 0.4 mol% and less than or equal to 2.5 mol%, greater than or equal to 0.4 mol% and less than or equal to 2 mol%, greater than or equal to 0.4 mol% and less than or equal to 1.4 mol%, greater than or equal to 0.4 mol% and less than or equal to 1 mol%, greater than or equal to 0.6 mol% and less than or equal to 3 mol%, greater than or equal to 0.6 mol% and less than or equal to 2.5 mol%, greater than or equal to 0.6 mol% and less than or equal to 2 mol%, greater than or equal to 0.6 mol% and less than or equal to 1.5 mol%, greater than or equal to 0.6 mol% and less than or equal to 1 mol%, greater than or equal to 0.8 mol% and less than or equal to 3 mol%, greater than or equal to 0.8 mol% and less than or equal to 2.5 mol%, greater than or equal to 0.8 mol% and less than or equal to 2 mol%, greater than or equal to 0.8 mol% and less than or equal to 1.5 mol%, or even greater than or equal to 0.8 mol% and less than or equal to 1 mol%, or any and all subranges formed by any of these endpoints.

[0092] In addition to improving fracture toughness, TiO2 can also provide UV exposure resistance to color change. In embodiments, the glass composition and the resulting glass article can include from greater than or equal to 0 mol% to less than or equal to 3 mol% TiO2. In embodiments, the glass composition and the resulting glass article can include from greater than 0 mol% to less than or equal to 3 mol% TiO2. In embodiments, the concentration of TiO2 in the glass composition and the resulting glass article can be greater than or equal to 0 mol%, greater than or equal to 0.2 mol%, greater than or equal to 0.4 mol%, greater than or equal to 0.6 mol%, or even greater than or equal to 0.8 mol%. In embodiments, the concentration of TiO2 in the glass composition and the resulting glass article can be less than or equal to 3 mol%, less than or equal to 2.5 mol%, less than or equal to 2 mol%, less than or equal to 1.5 mol%, or even less than or equal to 1 mol%. In embodiments, the concentration of TiO2 in the glass composition and the resulting glass article can be from greater than or equal to 0 mol% to less than or equal to 3 mol%, from greater than or equal to 0 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0 mol% to less than or equal to 2 mol%, from greater than or equal to 0 mol% to less than or equal to 1.5 mol%, from greater than or equal to 0 mol% to less than or equal to 1 mol%, from greater than or equal to 0.2 mol% to less than or equal to 3 mol%, from greater than or equal to 0.2 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0.2 mol% to less than or equal to 2 mol%, from greater than or equal to 0.2 mol% to less than or equal to 1.5 mol%, from greater than or equal to 0.2 mol% to less than or equal to 1 mol%, from greater than or equal to 0.4 mol% to less than or equal to 3 mol%, from greater than or equal to 0.4 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0.4 mol% to less than or equal to 2 mol%, from greater than or equal to 0.4 mol% to less than or equal to 1.5 mol%, from greater than or equal to 0.4 mol% to less than or equal to 1 mol%, from greater than or equal to 0.6 mol% to less than or equal to 3 mol%, from greater than or equal to 0.6 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0.6 mol% to less than or equal to 2 mol%, from greater than or equal to 0.6 mol% to less than or equal to 1.5 mol%, from greater than or equal to 0.6 mol% to less than or equal to 1 mol%, from greater than or equal to 0.8 mol% to less than or equal to 3 mol%, from greater than or equal to 0.8 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0.8 mol% to less than or equal to 2 mol%, from greater than or equal to 0.8 mol% to less than or equal to 1.5 mol%, or even from greater than or equal to 0.8 mol% to less than or equal to 1 mol%, or any and all subranges formed by any of these endpoints.In an embodiment, the glass composition and the resulting glass article can be free or substantially free of TiO2.

[0093] In addition to improving fracture toughness, WO3 can also provide UV exposure resistance to color changes and can increase the diffusion rate of ions in the glass article during ion exchange treatment, thereby improving the efficiency of these treatments. For example, in the case of DOL, WO3-containing glass articles can also exhibit relatively rapid ion exchange. In embodiments, the glass composition and the resulting glass article can include from greater than or equal to 0 mol% to less than or equal to 3 mol% WO3. In embodiments, the glass composition and the resulting glass article can include greater than 0 mol% and less than or equal to 3 mol% WO3. In embodiments, the concentration of WO3 in the glass composition and the resulting glass article can be greater than or equal to 0 mol%, greater than or equal to 0.2 mol%, greater than or equal to 0.4 mol%, greater than or equal to 0.6 mol%, or even greater than or equal to 0.8 mol%. In embodiments, the concentration of WO3 in the glass composition and the resulting glass article can be less than or equal to 3 mol%, less than or equal to 2.5 mol%, less than or equal to 2 mol%, less than or equal to 1.5 mol%, or even less than or equal to 1 mol%.In an embodiment, the concentration of WO3 in the glass composition and the resulting glass article can be greater than or equal to 0 mol% and less than or equal to 3 mol%, greater than or equal to 0 mol% and less than or equal to 2.5 mol%, greater than or equal to 0 mol% and less than or equal to 2 mol%, greater than or equal to 0 mol% and less than or equal to 1.5 mol%, greater than or equal to 0 mol% and less than or equal to 1 mol%, greater than or equal to 0.2 mol% and less than or equal to 3 mol%, greater than or equal to 0.2 mol% and less than or equal to 2.5 mol%, greater than or equal to 0.2 mol% and less than or equal to 2 mol%, greater than or equal to 0.2 mol% and less than or equal to 1.5 mol%, greater than or equal to 0.2 mol% and less than or equal to 1 mol%, greater than or equal to 0.4 mol% and less than or equal to 3 mol%, greater than or equal to 0.4 mol% and less than or equal to 2.5 mol%, greater than or equal to 0.4 mol% and less than or equal to 2 mol%, greater than or equal to 0.4 mol% and less than or equal to 1.5 mol%, greater than or equal to 0.4 mol% and less than or equal to 1 mol%, greater than or equal to 0.6 mol% and less than or equal to 3 mol%, greater than or equal to 0.6 mol% and less than or equal to 2.5 mol%, greater than or equal to 0.6 mol% and less than or equal to 2 mol%, greater than or equal to 0.6 mol% and less than or equal to 1.5 mol%, greater than or equal to 0.6 mol% and less than or equal to 1 mol%, greater than or equal to 0.8 mol% and less than or equal to 3 mol%, greater than or equal to 0.8 mol% and less than or equal to 2.5 mol%, greater than or equal to 0.8 mol% and less than or equal to 2 mol%, greater than or equal to 0.8 mol% and less than or equal to 1.5 mol%, or even greater than or equal to 0.8 mol% and less than or equal to 1 mol%, or any and all subranges formed by any one of these endpoints. In an embodiment, the glass composition and the resulting glass article can be free or substantially free of WO3.

[0094] As described above, Y2O3 can increase the fracture toughness of the glass compositions and the resulting glass articles described herein. In embodiments, the glass compositions and the resulting glass articles can include from greater than or equal to 0 mol% to less than or equal to 3 mol% Y2O3. In embodiments, the glass compositions and the resulting glass articles can include from greater than 0 mol% to less than or equal to 3 mol% Y2O3. In embodiments, the concentration of Y2O3 in the glass compositions and the resulting glass articles can be greater than or equal to 0 mol%, greater than or equal to 0.2 mol%, greater than or equal to 0.4 mol%, greater than or equal to 0.6 mol% or even greater than or equal to 0.8 mol%. In embodiments, the concentration of Y2O3 in the glass compositions and the resulting glass articles can be less than or equal to 3 mol%, less than or equal to 2.5 mol%, less than or equal to 2 mol%, less than or equal to 1.5 mol% or even less than or equal to 1 mol%. In embodiments, the concentration of Y2O3 in the glass compositions and the resulting glass articles can be from greater than or equal to 0 mol% to less than or equal to 3 mol%, from greater than or equal to 0 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0 mol% to less than or equal to 2 mol%, from greater than or equal to 0 mol% to less than or equal to 1.5 mol%, from greater than or equal to 0 mol% to less than or equal to 1 mol%, from greater than or equal to 0.2 mol% to less than or equal to 3 mol%, from greater than or equal to 0.2 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0.2 mol% to less than or equal to 2 mol%, from greater than or equal to 0.2 mol% to less than or equal to 1.5 mol%, from greater than or equal to 0.2 mol% to less than or equal to 1 mol%, from greater than or equal to 0.4 mol% to less than or equal to 3 mol%, from greater than or equal to 0.4 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0.4 mol% to less than or equal to 2 mol%, from greater than or equal to 0.4 mol% to less than or equal to 1.5 mol%, from greater than or equal to 0.4 mol% to less than or equal to 1 mol%, from greater than or equal to 0.6 mol% to less than or equal to 3 mol%, from greater than or equal to 0.6 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0.6 mol% to less than or equal to 2 mol%, from greater than or equal to 0.6 mol% to less than or equal to 1.5 mol%, from greater than or equal to 0.6 mol% to less than or equal to 1 mol%, from greater than or equal to 0.8 mol% to less than or equal to 3 mol%, from greater than or equal to 0.8 mol% to less than or equal to 2.5 mol%, from greater than or equal to 0.8 mol% to less than or equal to 2 mol%, from greater than or equal to 0.8 mol% to less than or equal to 1.5 mol% or even from greater than or equal to 0.8 mol% to less than or equal to 1 mol%, or any and all sub-ranges formed by any of these endpoints.In an embodiment, the glass composition and the resulting glass article can be free or substantially free of Y2O3.

[0095] The glass compositions described herein may further include MgO. MgO reduces the viscosity of the glass composition, which enhances formability, strain point, and Young's modulus and may improve ion exchangeability. However, when too much MgO is added to the glass composition, the diffusivities of sodium and potassium ions in the glass article are reduced, which in turn adversely affects the ion exchange properties (i.e., the ability to ion exchange) of the resulting glass. In embodiments, the glass composition and the resulting glass article may include greater than 0 mol% and less than or equal to 6.5 mol% MgO. In embodiments, the concentration of MgO in the glass composition and the resulting glass article may be greater than or equal to 0 mol%, greater than or equal to 0.1 mol%, greater than or equal to 0.5 mol%, greater than or equal to 1 mol%, or even greater than or equal to 2 mol%. In embodiments, the concentration of MgO in the glass composition and the resulting glass article may be less than or equal to 6.5 mol%, less than or equal to 5.5 mol%, less than or equal to 4.5 mol%, less than or equal to 3.5 mol%, or even less than or equal to 2.5 mol%.In an embodiment, the concentration of MgO in the glass composition and the resulting glass article can be greater than or equal to 0 mol% and less than or equal to 6.5 mol%, greater than or equal to 0 mol% and less than or equal to 5.5 mol%, greater than or equal to 0 mol% and less than or equal to 4.5 mol%, greater than or equal to 0 mol% and less than or equal to 3.5 mol%, greater than or equal to 0 mol% and less than or equal to 2.5 mol%, greater than or equal to 0.1 mol% and less than or equal to 6.5 mol%, greater than or equal to 0.1 mol% and less than or equal to 5.5 mol%, greater than or equal to 0.1 mol% and less than or equal to 4.5 mol%, greater than or equal to 0.1 mol% and less than or equal to 3.5 mol%, greater than or equal to 0.1 mol% and less than or equal to 2.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 6.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 5.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 4.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 3.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 2.5 mol%, greater than or equal to 1 mol% and less than or equal to 6.5 mol%, greater than or equal to 1 mol% and less than or equal to 5.5 mol%, greater than or equal to 1 mol% and less than or equal to 4.5 mol%, greater than or equal to 1 mol% and less than or equal to 3.5 mol%, greater than or equal to 1 mol% and less than or equal to 2.5 mol%, greater than or equal to 2 mol% and less than or equal to 6.5 mol%, greater than or equal to 2 mol% and less than or equal to 5.5 mol%, greater than or equal to 2 mol% and less than or equal to 4.5 mol%, greater than or equal to 2 mol% and less than or equal to 3.5 mol%, or even greater than or equal to 2 mol% and less than or equal to 2.5 mol%, or any and all subranges formed by any one of these endpoints. In an embodiment, the glass composition and the resulting glass article can be free or substantially free of MgO.

[0096] The glass compositions described herein may further include CaO. CaO reduces the viscosity of the glass composition, which enhances formability, strain point, and Young's modulus, and may improve ion exchangeability. However, when too much CaO is added to the glass composition, the diffusivity of sodium and potassium ions in the resulting glass article is reduced, which in turn adversely affects the ion exchange performance (i.e., the ability to ion exchange) of the resulting glass. In embodiments, the glass composition and the resulting glass article may include greater than 0 mol% and less than or equal to 6.5 mol% CaO. In embodiments, the concentration of CaO in the glass composition and the resulting glass article may be greater than or equal to 0 mol%, greater than or equal to 0.1 mol%, greater than or equal to 0.5 mol%, greater than or equal to 1 mol%, greater than or equal to 2 mol%, or even greater than or equal to 3 mol%. In embodiments, the concentration of CaO in the glass composition and the resulting glass article may be less than or equal to 6.5 mol%, less than or equal to 5.5 mol%, less than or equal to 4.5 mol%, or even less than or equal to 3.5 mol%.In an embodiment, the concentration of CaO in the glass composition and the resulting glass article can be greater than or equal to 0 mol% and less than or equal to 6.5 mol%, greater than or equal to 0 mol% and less than or equal to 5.5 mol%, greater than or equal to 0 mol% and less than or equal to 4.5 mol%, greater than or equal to 0 mol% and less than or equal to 3.5 mol%, greater than or equal to 0.1 mol% and less than or equal to 6.5 mol%, greater than or equal to 0.1 mol% and less than or equal to 5.5 mol%, greater than or equal to 0.1 mol% and less than or equal to 4.5 mol%, greater than or equal to 0.1 mol% and less than or equal to 3.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 6.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 5.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 4.5 mol%, greater than or equal to 0.5 mol% and less than or equal to 3.5 mol%, greater than or equal to 1 mol% and less than or equal to 6.5 mol%, greater than or equal to 1 mol% and less than or equal to 5.5 mol%, greater than or equal to 1 mol% and less than or equal to 4.5 mol%, greater than or equal to 1 mol% and less than or equal to 3.5 mol%, greater than or equal to 2 mol% and less than or equal to 6.5 mol%, greater than or equal to 2 mol% and less than or equal to 5.5 mol%, greater than or equal to 2 mol% and less than or equal to 4.5 mol%, greater than or equal to 2 mol% and less than or equal to 3.5 mol%, greater than or equal to 3 mol% and less than or equal to 6.5 mol%, greater than or equal to 3 mol% and less than or equal to 5.5 mol%, greater than or equal to 3 mol% and less than or equal to 4.5 mol%, or even greater than or equal to 3 mol% and less than or equal to 3.5 mol%, or any and all subranges formed by any one of these endpoints. In an embodiment, the glass composition and the resulting glass article can be free or substantially free of CaO.

[0097] In embodiments, the glass compositions and resulting glass articles described herein can further comprise one or more fining agents. In embodiments, the fining agent can comprise, for example, SnO₂. In embodiments, the glass composition and resulting glass article can include greater than 0 mol% and less than or equal to 1 mol% SnO₂. In embodiments, the concentration of SnO₂ in the glass composition and resulting glass article can be greater than or equal to 0 mol%. In embodiments, the concentration of SnO₂ in the glass composition and resulting glass article can be less than or equal to 1 mol%, less than or equal to 0.5 mol%, less than or equal to 0.3 mol%, or even less than or equal to 0.1 mol%. In embodiments, the concentration of SnO₂ in the glass composition and resulting glass article can be greater than or equal to 0 mol% and less than or equal to 1 mol%, greater than or equal to 0 mol% and less than or equal to 0.5 mol%, greater than or equal to 0 mol% and less than or equal to 0.3 mol%, or even greater than or equal to 0 mol% and less than or equal to 0.1 mol%, or any and all subranges formed by any of these endpoints. In embodiments, the glass composition and resulting glass article can be substantially free of SnO₂.

[0098] In embodiments, the glass compositions described herein can further comprise impurity materials such as FeO, Fe₂O₃, MnO, MoO₃, La₂O₃, CdO, As₂O₃, Sb₂O₃, sulfur-based compounds (such as sulfates), halogens, or combinations thereof.

[0099] In embodiments, the glass composition can include: greater than or equal to 55 mol% and less than or equal to 70 mol% SiO₂; greater than or equal to 12.5 mol% and less than or equal to 17.25 mol% Al₂O₃; greater than or equal to 0.1 mol% and less than or equal to 3.5 mol% P₂O₅; greater than or equal to 0 mol% and less than or equal to 5.5 mol% B₂O₃; greater than or equal to 6 mol% and less than or equal to 10 mol% Li₂O; greater than or equal to 3 mol% and less than or equal to 10 mol% Na₂O; greater than or equal to 0 mol% and less than or equal to 3 mol% TiO₂; greater than or equal to 0 mol% and less than or equal to 3 mol% WO₃; and greater than or equal to 0 mol% and less than or equal to 3 mol% Y₂O₃, wherein Al₂O₃ + B₂O₃ is greater than or equal to 12.5 mol% and less than or equal to 22.5 mol%, and TiO₂ + WO₃ + Y₂O₃ is greater than or equal to 0.2 mol% and less than or equal to 3 mol%.

[0100] Articles formed from the glass compositions described herein can be of any suitable shape or thickness, which can vary depending on the particular application for which the glass composition is used. The thickness of the glass sheet embodiments can be greater than or equal to 30 μm, greater than or equal to 50 μm, greater than or equal to 100 μm, greater than or equal to 250 μm, greater than or equal to 500 μm, greater than or equal to 750 μm or even greater than or equal to 1 mm. In embodiments, the thickness of the glass sheet embodiments can be less than or equal to 6 mm, less than or equal to 5 mm, less than or equal to 4 mm, less than or equal to 3 mm or even less than or equal to 2 mm. In embodiments, the thickness of the glass sheet embodiments can be greater than or equal to 30 μm and less than or equal to 6 mm, greater than or equal to 30 μm and less than or equal to 5 mm, greater than or equal to 30 μm and less than or equal to 4 mm, greater than or equal to 30 μm and less than or equal to 3 mm, greater than or equal to 30 μm and less than or equal to 2 mm, greater than or equal to 50 μm and less than or equal to 6 mm, greater than or equal to 50 μm and less than or equal to 5 mm, greater than or equal to 50 μm and less than or equal to 4 mm, greater than or equal to 50 μm and less than or equal to 3 mm, greater than or equal to 50 μm and less than or equal to 2 mm, greater than or equal to 100 μm and less than or equal to 6 mm, greater than or equal to 100 μm and less than or equal to 5 mm, greater than or equal to 100 μm and less than or equal to 4 mm, greater than or equal to 100 μm and less than or equal to 3 mm, greater than or equal to 100 μm and less than or equal to 2 mm, greater than or equal to 250 μm and less than or equal to 6 mm, greater than or equal to 250 μm and less than or equal to 5 mm, greater than or equal to 250 μm and less than or equal to 4 mm, greater than or equal to 250 μm and less than or equal to 3 mm, greater than or equal to 250 μm and less than or equal to 2 mm, greater than or equal to 500 μm and less than or equal to 6 mm, greater than or equal to 500 μm and less than or equal to 5 mm, greater than or equal to 500 μm and less than or equal to 4 mm, greater than or equal to 500 μm and less than or equal to 3 mm, greater than or equal to 500 μm and less than or equal to 2 mm, greater than or equal to 750 μm and less than or equal to 6 mm, greater than or equal to 750 μm and less than or equal to 5 mm, greater than or equal to 750 μm and less than or equal to 4 mm, greater than or equal to 750 μm and less than or equal to 3 mm, greater than or equal to 750 μm and less than or equal to 2 mm, greater than or equal to 1 mm and less than or equal to 6 mm, greater than or equal to 1 mm and less than or equal to 5 mm, greater than or equal to 1 mm and less than or equal to 4 mm, greater than or equal to 1 mm and less than or equal to 3 mm or even greater than or equal to 1 mm and less than or equal to 2 mm, or any and all sub-ranges formed by any of these endpoints.

[0101] As discussed above, the glass compositions and resulting glass articles described herein can have increased fracture toughness, making the glass compositions and resulting glass articles more resistant to damage. In embodiments, the K Ic fracture toughness of the glass compositions and resulting glass articles can be greater than or equal to 0.7 MPa·m 1 / 2 、greater than or equal to 0.8 MPa·m 1 / 2 、greater than or equal to 0.9 MPa·m 1 / 2 、greater than or equal to 1.0 MPa·m 1 / 2 or even greater than or equal to 1.1 MPa·m 1 / 2 .

[0102] In embodiments, the density of the glass compositions and resulting glass articles can be greater than or equal to 2.3 g / cm 3 、greater than or equal to 2.35 g / cm 3 or even greater than or equal to 2.4 g / cm 3 . In embodiments, the density of the glass compositions and resulting glass articles can be less than or equal to 2.6 g / cm 3 、less than or equal to 2.55 g / cm 3 or even less than or equal to 2.5 g / cm 3 . In embodiments, the density of the glass compositions and resulting glass articles can be greater than or equal to 2.3 g / cm 3 and less than or equal to 2.6 g / cm 3 、greater than or equal to 2.3 g / cm 3 and less than or equal to 2.55 g / cm 3 、greater than or equal to 2.3 g / cm 3 and less than or equal to 2.5 g / cm 3 、greater than or equal to 2.35 g / cm 3 and less than or equal to 2.6 g / cm 3 、greater than or equal to 2.35 g / cm 3 and less than or equal to 2.55 g / cm 3 、greater than or equal to 2.35 g / cm 3 and less than or equal to 2.5 g / cm 3 、greater than or equal to 2.4 g / cm 3 and less than or equal to 2.6 g / cm 3 、greater than or equal to 2.4 g / cm 3 and less than or equal to 2.55 g / cm 3 or even greater than or equal to 2.4 g / cm 3 and less than or equal to 2.5 g / cm 3 , or any and all subranges formed by any of these endpoints.

[0103] In embodiments, the strain point of the glass composition and the resulting glass article can be greater than or equal to 400 °C, greater than or equal to 450 °C, or even greater than or equal to 500 °C. In embodiments, the strain point of the glass composition and the resulting glass article can be less than or equal to 700 °C, less than or equal to 650 °C, or even less than or equal to 600 °C. In embodiments, the strain point of the glass composition and the resulting glass article can be greater than or equal to 400 °C and less than or equal to 700 °C, greater than or equal to 400 °C and less than or equal to 650 °C, greater than or equal to 400 °C and less than or equal to 600 °C, greater than or equal to 450 °C and less than or equal to 700 °C, greater than or equal to 450 °C and less than or equal to 650 °C, greater than or equal to 450 °C and less than or equal to 600 °C, greater than or equal to 500 °C and less than or equal to 700 °C, greater than or equal to 500 °C and less than or equal to 650 °C, or even greater than or equal to 500 °C and less than or equal to 600 °C, or any and all sub-ranges formed by any one of these endpoints.

[0104] In embodiments, the annealing point of the glass composition and the resulting glass article can be greater than or equal to 500 °C or even greater than or equal to 550 °C. In embodiments, the annealing point of the glass composition and the resulting glass article can be less than or equal to 800 °C or even less than or equal to 700 °C. In embodiments, the annealing point of the glass composition and the resulting glass article can be greater than or equal to 500 °C and less than or equal to 800 °C, greater than or equal to 500 °C and less than or equal to 700 °C, greater than or equal to 550 °C and less than or equal to 800 °C, or even greater than or equal to 550 °C and less than or equal to 700 °C, or any and all sub-ranges formed by any one of these endpoints.

[0105] In embodiments, the Young's modulus of the glass composition and the resulting glass article can be greater than or equal to 60 GPa, greater than or equal to 65 GPa, or even greater than or equal to 70 GPa. In embodiments, the Young's modulus of the glass composition and the resulting glass article can be less than or equal to 110 GPa, less than or equal to 100 GPa, or even less than or equal to 90 GPa. In embodiments, the Young's modulus of the glass composition and the resulting glass article can be greater than or equal to 60 GPa and less than or equal to 110 GPa, greater than or equal to 60 GPa and less than or equal to 100 GPa, greater than or equal to 60 GPa and less than or equal to 90 GPa, greater than or equal to 65 GPa and less than or equal to 110 GPa, greater than or equal to 65 GPa and less than or equal to 100 GPa, greater than or equal to 65 GPa and less than or equal to 90 GPa, greater than or equal to 70 GPa and less than or equal to 110 GPa, greater than or equal to 70 GPa and less than or equal to 100 GPa, or even greater than or equal to 70 GPa and less than or equal to 90 GPa, or any and all sub-ranges formed by any one of these endpoints.

[0106] In embodiments, the shear modulus of the glass composition and the resulting glass article can be greater than or equal to 20 GPa, greater than or equal to 25 GPa, or even greater than or equal to 30 GPa. In embodiments, the shear modulus of the glass composition and the resulting glass article can be less than or equal to 50 GPa, less than or equal to 45 GPa, or even less than or equal to 40 GPa. In embodiments, the shear modulus of the glass composition and the resulting glass article can be greater than or equal to 20 GPa and less than or equal to 50 GPa, greater than or equal to 20 GPa and less than or equal to 45 GPa, greater than or equal to 20 GPa and less than or equal to 40 GPa, greater than or equal to 25 GPa and less than or equal to 50 GPa, greater than or equal to 25 GPa and less than or equal to 45 GPa, greater than or equal to 25 GPa and less than or equal to 40 GPa, greater than or equal to 30 GPa and less than or equal to 50 GPa, greater than or equal to 30 GPa and less than or equal to 45 GPa, or even greater than or equal to 30 GPa and less than or equal to 40 GPa, or any and all subranges formed by any one of these endpoints.

[0107] In embodiments, the glass compositions and the resulting glass articles described herein can have a relatively high Poisson's ratio, which increases the fracture energy and makes the glass compositions more damage resistant. In embodiments, the Poisson's ratio of the glass composition and the resulting glass article can be greater than or equal to 0.19, greater than or equal to 0.20, or even greater than or equal to 0.21. In embodiments, the Poisson's ratio of the glass composition and the resulting glass article can be less than or equal to 0.25, less than or equal to 0.24, or even less than or equal to 0.23. In embodiments, the Poisson's ratio of the glass composition and the resulting glass article can be greater than or equal to 0.19 and less than or equal to 0.25, greater than or equal to 0.19 and less than or equal to 0.24, greater than or equal to 0.19 and less than or equal to 0.23, greater than or equal to 0.20 and less than or equal to 0.25, greater than or equal to 0.20 and less than or equal to 0.24, greater than or equal to 0.20 and less than or equal to 0.23, greater than or equal to 0.21 and less than or equal to 0.25, greater than or equal to 0.21 and less than or equal to 0.24, or even greater than or equal to 0.21 and less than or equal to 0.23, or any and all subranges formed by any one of these endpoints.

[0108] In embodiments, the refractive index of the glass composition and the resulting glass article can be greater than or equal to 1.4, greater than or equal to 1.45, or even greater than or equal to 1.5. In embodiments, the refractive index of the glass composition and the resulting glass article can be less than or equal to 1.6 or even less than or equal to 1.55. In embodiments, the refractive index of the glass composition and the resulting glass article can be greater than or equal to 1.4 and less than or equal to 1.6, greater than or equal to 1.4 and less than or equal to 1.55, greater than or equal to 1.45 and less than or equal to 1.6, greater than or equal to 1.45 and less than or equal to 1.55, greater than or equal to 1.5 and less than or equal to 1.6, or even greater than or equal to 1.5 and less than or equal to 1.55, or any and all subranges formed by any one of these endpoints.

[0109] In embodiments, the stress optical coefficient (SOC) of the glass composition and the resulting glass article can be greater than or equal to 2.5 nm / mm / MPa or even greater than or equal to 2.75 nm / mm / MPa. In embodiments, the SOC of the glass composition and the resulting glass article can be less than or equal to 3.5 nm / mm / MPa or even less than or equal to 3.25 nm / mm / MPa. In embodiments, the SOC of the glass composition and the resulting glass article can be greater than or equal to 2.5 nm / mm / MPa and less than or equal to 3.5 nm / mm / MPa, greater than or equal to 2.5 nm / mm / MPa and less than or equal to 3.25 nm / mm / MPa, greater than or equal to 2.75 nm / mm / MPa and less than or equal to 3.5 nm / mm / MPa, or even greater than or equal to 2.75 nm / mm / MPa and less than or equal to 3.25 nm / mm / MPa, or any and all subranges formed by any one of these endpoints.

[0110] In embodiments, the liquidus viscosity of the glass composition and the resulting glass article can be greater than or equal to 0.5 kP, greater than or equal to 1 kP, greater than or equal to 5 kP, greater than or equal to 10 kP, greater than or equal to 25 kP, or even greater than or equal to 50 kP. In embodiments, the liquidus viscosity of the glass composition and the resulting glass article can be less than or equal to 300 kP, less than or equal to 250 kP, less than or equal to 200 kP, less than or equal to 150 kP, or even less than or equal to 100 kP. In embodiments, the liquidus viscosity of the glass composition and the resulting glass article can be greater than or equal to 0.5 kP and less than or equal to 300 kP, greater than or equal to 0.5 kP and less than or equal to 250 kP, greater than or equal to 0.5 kP and less than or equal to 200 kP, greater than or equal to 0.5 kP and less than or equal to 150 kP, greater than or equal to 0.5 kP and less than or equal to 100 kP, greater than or equal to 1 kP and less than or equal to 300 kP, greater than or equal to 1 kP and less than or equal to 250 kP, greater than or equal to 1 kP and less than or equal to 200 kP, greater than or equal to 1 kP and less than or equal to 150 kP, greater than or equal to 1 kP and less than or equal to 100 kP, greater than or equal to 5 kP and less than or equal to 300 kP, greater than or equal to 5 kP and less than or equal to 250 kP, greater than or equal to 5 kP and less than or equal to 200 kP, greater than or equal to 5 kP and less than or equal to 150 kP, greater than or equal to 5 kP and less than or equal to 100 kP, greater than or equal to 10 kP and less than or equal to 300 kP, greater than or equal to 10 kP and less than or equal to 250 kP, greater than or equal to 10 kP and less than or equal to 200 kP, greater than or equal to 10 kP and less than or equal to 150 kP, greater than or equal to 10 kP and less than or equal to 100 kP, greater than or equal to 25 kP and less than or equal to 300 kP, greater than or equal to 25 kP and less than or equal to 250 kP, greater than or equal to 25 kP and less than or equal to 200 kP, greater than or equal to 25 kP and less than or equal to 150 kP, greater than or equal to 25 kP and less than or equal to 100 kP, greater than or equal to 50 kP and less than or equal to 300 kP, greater than or equal to 50 kP and less than or equal to 250 kP, greater than or equal to 50 kP and less than or equal to 200 kP, greater than or equal to 50 kP and less than or equal to 150 kP, or even greater than or equal to 50 kP and less than or equal to 100 kP, or any and all sub-ranges formed by any of these endpoints. These viscosity ranges allow the glass composition to be formed into sheets by a variety of different techniques, including but not limited to fusion forming, slot drawing, floating, rolling, and other sheet forming processes known to those skilled in the art. However, it should be understood that other processes can be used to form other articles (i.e., other than sheets).

[0111] In an embodiment, a method for making a glass article comprises heat treating a glass composition as described herein at one or more preselected temperatures for one or more preselected times to melt the glass composition and cooling the glass composition. In an embodiment, the heat treatment for making a glass article may comprise: (i) heating the glass composition to a glass melting temperature at a rate of 1 to 100°C / min; (ii) maintaining the glass composition at the glass melting temperature for a time greater than or equal to 4 hours and less than or equal to 100 hours to produce a glass article; and (iii) cooling the formed glass article to room temperature. In an embodiment, the glass melting temperature may be greater than or equal to 1500°C and less than or equal to 1700°C.

[0112] In embodiments, the glass compositions described herein are ion exchangeable to facilitate strengthening of glass articles made from the glass compositions. In a typical ion exchange process, smaller metal ions in the glass article are replaced or "exchanged" with larger metal ions of the same valence in a layer near the outer surface of the glass article. The replacement of smaller ions with larger ions creates compressive stresses within the layer of the glass article. In embodiments, the metal ions are monovalent metal ions (e.g., Li + 、Na + , K + etc.), and ion exchange is achieved by immersing the glass article in a bath of at least one molten salt comprising larger metal ions, which replace the smaller metal ions in the glass article. Alternatively, other monovalent ions, such as Ag, + , Tl + , Cu + The one or more ion exchange processes used to strengthen the glass article may include, but are not limited to, immersion in a single bath or multiple baths of the same or different compositions with washing and / or annealing steps between immersions.

[0113] According to an embodiment, after exposure to a glass article, an ion exchange solution (e.g., a KNO3 and / or NaNO3 molten salt bath) can be at a temperature of: greater than or equal to 350 °C and less than or equal to 500 °C, greater than or equal to 360 °C and less than or equal to 450 °C, greater than or equal to 370 °C and less than or equal to 440 °C, greater than or equal to 360 °C and less than or equal to 420 °C, greater than or equal to 370 °C and less than or equal to 400 °C, greater than or equal to 375 °C and less than or equal to 475 °C, greater than or equal to 400 °C and less than or equal to 500 °C, greater than or equal to 410 °C and less than or equal to 490 °C, greater than or equal to 420 °C and less than or equal to 480 °C, greater than or equal to 430 °C and less than or equal to 470 °C or even greater than or equal to 440 °C and less than or equal to 460 °C, or any and all sub-ranges between the foregoing values. In an embodiment, the glass article can be exposed to the ion exchange solution for a duration of: greater than or equal to 1 hour and less than or equal to 24 hours, greater than or equal to 1 hour and less than or equal to 18 hours, greater than or equal to 1 hour and less than or equal to 12 hours, greater than or equal to 1 hour and less than or equal to 6 hours, greater than or equal to 2 hours and less than or equal to 24 hours, greater than or equal to 2 hours and less than or equal to 18 hours, greater than or equal to 2 hours and less than or equal to 12 hours, greater than or equal to 2 hours and less than or equal to 6 hours, greater than or equal to 4 hours and less than or equal to 24 hours, greater than or equal to 4 hours and less than or equal to 18 hours or even greater than or equal to 4 hours and less than or equal to 12 hours, greater than or equal to 4 hours and less than or equal to 6 hours, or any and all sub-ranges formed by any one of these endpoints.

[0114] In an embodiment, the relatively increased K of the glass composition described herein Ic fracture toughness can improve the stress distribution (e.g., surface compressive stress, layer depth, and maximum center tension) of the resulting glass article, thereby improving the mechanical properties.

[0115] In an embodiment, a glass article made of the glass composition can have a surface compressive stress greater than or equal to 450 MPa after ion-exchange strengthening. In an embodiment, a glass article made of the glass composition can have the following surface compressive stresses after ion-exchange strengthening: greater than or equal to 450 MPa, greater than or equal to 500 MPa, greater than or equal to 550 MPa, greater than or equal to 600 MPa, or even greater than or equal to 650 MPa. In an embodiment, a glass article made of the glass composition can have the following surface compressive stresses after ion-exchange strengthening: less than or equal to 900 MPa, less than or equal to 800 MPa, or even less than or equal to 700 MPa. In an embodiment, a glass article made of the glass composition can have the following surface compressive stresses after ion-exchange strengthening: greater than or equal to 450 MPa and less than or equal to 900 MPa, greater than or equal to 450 MPa and less than or equal to 800 MPa, greater than or equal to 450 MPa and less than or equal to 700 MPa, greater than or equal to 500 MPa and less than or equal to 900 MPa, greater than or equal to 500 MPa and less than or equal to 800 MPa, greater than or equal to 500 MPa and less than or equal to 700 MPa, greater than or equal to 550 MPa and less than or equal to 900 MPa, greater than or equal to 550 MPa and less than or equal to 800 MPa, greater than or equal to 550 MPa and less than or equal to 700 MPa, greater than or equal to 600 MPa and less than or equal to 900 MPa, greater than or equal to 600 MPa and less than or equal to 800 MPa, greater than or equal to 600 MPa and less than or equal to 700 MPa, greater than or equal to 650 MPa and less than or equal to 900 MPa, greater than or equal to 650 MPa and less than or equal to 800 MPa, or even greater than or equal to 650 MPa and less than or equal to 700 MPa, or any and all subranges formed by any one of these endpoints.

[0116] In an embodiment, a glass article made of the glass composition may have a layer depth greater than or equal to 5 μm after ion exchange strengthening. In an embodiment, a glass article made of the glass composition may have the following layer depths after ion exchange strengthening: greater than or equal to 5 μm, greater than or equal to 7 μm, or even greater than or equal to 9 μm. In an embodiment, a glass article made of the glass composition may have the following layer depths after ion exchange strengthening: less than or equal to 20 μm, less than or equal to 18 μm, less than or equal to 16 μm, or even less than or equal to 14 μm. In an embodiment, a glass article made of the glass composition may have the following layer depths after ion exchange strengthening: greater than or equal to 5 μm and less than or equal to 20 μm, greater than or equal to 5 μm and less than or equal to 18 μm, greater than or equal to 5 μm and less than or equal to 16 μm, greater than or equal to 5 μm and less than or equal to 14 μm, greater than or equal to 7 μm and less than or equal to 20 μm, greater than or equal to 7 μm and less than or equal to 18 μm, greater than or equal to 7 μm and less than or equal to 16 μm, greater than or equal to 7 μm and less than or equal to 14 μm, greater than or equal to 9 μm and less than or equal to 20 μm, greater than or equal to 9 μm and less than or equal to 18 μm, greater than or equal to 9 μm and less than or equal to 16 μm, or even greater than or equal to 9 μm and less than or equal to 14 μm, or any and all subranges formed by any one of these endpoints.

[0117] In an embodiment, a glass article made of a glass composition can have a maximum central tension of greater than or equal to 50 MPa measured at a product thickness of 0.8 mm after ion-exchange strengthening. In an embodiment, a glass article made of a glass composition can have a maximum central tension of greater than or equal to 50 MPa, greater than or equal to 55 MPa, greater than or equal to 60 MPa, greater than or equal to 65 MPa, or even greater than or equal to 70 MPa measured at a product thickness of 0.8 mm after ion-exchange strengthening. In an embodiment, a glass article made of a glass composition can have a maximum central tension of less than or equal to 125 MPa or even less than or equal to 100 MPa measured at a product thickness of 0.8 mm after ion-exchange strengthening. In an embodiment, a glass article made of a glass composition can have the following maximum central tension measured at a product thickness of 0.8 mm after ion-exchange strengthening: greater than or equal to 50 MPa and less than or equal to 125 MPa, greater than or equal to 50 MPa and less than or equal to 100 MPa, greater than or equal to 55 MPa and less than or equal to 125 MPa, greater than or equal to 55 MPa and less than or equal to 100 MPa, greater than or equal to 60 MPa and less than or equal to 125 MPa, greater than or equal to 60 MPa and less than or equal to 100 MPa, greater than or equal to 65 MPa and less than or equal to 125 MPa, greater than or equal to 65 MPa and less than or equal to 100 MPa, greater than or equal to 75 MPa and less than or equal to 125 MPa, or even greater than or equal to 75 MPa and less than or equal to 100 MPa, or any and all subranges formed by any one of these endpoints.

[0118] The glass compositions and resulting glass articles described herein can be used in a variety of applications, including, for example, cover glass or glass backplane applications for consumer electronic devices or commercial electronic devices, including, for example, LCD and LED displays, computer monitors, and automated teller machines (ATMs); for touchscreen or touch sensor applications, which are used in portable electronic devices including, for example, mobile phones, personal media players, watches, and tablet computers; for integrated circuit applications, including, for example, semiconductor wafers; for photovoltaic applications; for architectural glass applications; for automotive or vehicle glass applications; or for commercial or household appliance applications. In an embodiment, consumer electronic devices (e.g., smartphones, tablet computers, watches, personal computers, ultrabooks, televisions, and cameras), architectural glass, and / or automotive glass can include a glass article as described herein.

[0119] Exemplary electronic devices incorporating any one of the glass articles disclosed herein are shown in Figure 1 and Figure 2 Specifically, Figure 1 and Figure 2Disclosed is a consumer electronic device 200, which includes: a housing 202 having a front surface 204, a rear surface 206, and a side surface 108; electrical components (not shown) that are at least partially or completely within the housing and at least include a controller, a memory, and a display 210 at or near the front surface of the housing; and a cover substrate 212 located at or above the front surface of the housing such that it is located above the display. In an embodiment, at least a portion of at least one of the cover substrate 212 and the housing 202 may include any of the glass articles disclosed herein.

[0120] Example

[0121] To more easily understand the various embodiments, reference is made to the following examples, which are intended to illustrate the various embodiments of the glass compositions described herein.

[0122] Table 1 shows the example glass compositions and comparative glass compositions (in mol%) and the corresponding properties of the glass compositions. Glass articles are formed with example glass compositions E1 to E30 and comparative glass composition C1.

[0123] Table 1

[0124]

[0125]

[0126] Continued Table 1

[0127]

[0128]

[0129] Continued Table 1

[0130]

[0131]

[0132] Continued Table 1

[0133]

[0134]

[0135] Continued Table 1

[0136]

[0137]

[0138] Continued Table 1

[0139]

[0140]

[0141] Continued Table 1

[0142]

[0143] As indicated by the example glass compositions in Table 1, the glass compositions and the resulting glass articles as described herein have increased K Ic fracture toughness, such that the glass compositions and the resulting glass articles are more resistant to damage.

[0144] Table 2 shows CS, DOL, and CT for comparative ion-exchanged glass article CA1 and example ion-exchanged glass articles EA1 to EA12 at a temperature of 380 °C for 2, 4, and 6 hours. The comparative ion-exchanged glass article and the example ion-exchanged glass articles are formed by ion-exchanging glass articles having a thickness of 0.8 mm and are prepared from a comparative glass composition and example glass compositions, as indicated in Table 2. The ion-exchange solution is an 80 wt% KNO3 / 20 wt% NaNO3 molten salt bath.

[0145] Table 2

[0146]

[0147]

[0148] Continued Table 2

[0149]

[0150] Continued Table 2

[0151]

[0152]

[0153] As indicated by the example ion-exchanged glass articles in Table 2, glass articles formed from glass compositions having increased K Ic fracture toughness as described herein can be ion-exchanged to achieve a desired stress distribution.

[0154] It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments described herein without departing from the spirit and scope of the claimed subject matter. Accordingly, this specification is intended to cover modifications and variations of the various embodiments described herein, provided that such modifications and variations fall within the scope of the appended claims and their equivalents.

Claims

1. A glass composition comprising: SiO2 in an amount greater than or equal to 55 mol% and less than or equal to 70 mol%; Al2O3 in an amount greater than or equal to 12.5 mol% and less than or equal to 17.25 mol%; P2O5 in an amount greater than or equal to 0.1 mol% and less than or equal to 3.5 mol%; B2O3 in an amount greater than or equal to 0 mol% and less than or equal to 5.5 mol%; Li2O in an amount greater than or equal to 6 mol% and less than or equal to 10 mol%; Na2O in an amount greater than or equal to 3 mol% and less than or equal to 10 mol%; TiO2 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%; WO3 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%; and Y2O3 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%, wherein Al2O3 + B2O3 is greater than or equal to 12.5 mol% and less than or equal to 22.5 mol%, and TiO2 + WO3 + Y2O3 is greater than or equal to 0.2 mol% and less than or equal to 3 mol%.

2. The glass composition according to claim 1, wherein TiO2 + WO3 + Y2O3 is greater than or equal to 0.4 mol% and less than or equal to 3 mol%.

3. The glass composition according to claim 1 or claim 2, wherein Al2O3 + B2O3 is greater than or equal to 13.5 mol% and less than or equal to 21.5 mol%.

4. The glass composition according to any one of claims 1 to 3, wherein the glass composition comprises B2O3 in an amount greater than or equal to 0.1 mol% and less than or equal to 5.25 mol%.

5. The glass composition according to any one of claims 1 to 4, wherein the glass composition comprises Al2O3 in an amount greater than or equal to 13 mol% and less than or equal to 17 mol%.

6. The glass composition according to any one of claims 1 to 5, wherein R2O is greater than or equal to 9 mol% and less than or equal to 20 mol%, and R2O is the sum of Li2O, Na2O, and K2O.

7. The glass composition according to any one of claims 1 to 6, wherein the glass composition comprises K2O in an amount greater than 0 mol% and less than or equal to 1 mol%.

8. The glass composition according to any one of claims 1 to 7, wherein the glass composition comprises MgO in an amount greater than 0 mol% and less than or equal to 6.5 mol%.

9. The glass composition according to any one of claims 1 to 8, wherein the glass composition comprises CaO in an amount greater than 0 mol% and less than or equal to 6.5 mol%.

10. The glass composition according to any one of claims 1 to 9, wherein the glass composition comprises SnO2 in an amount greater than 0 mol% and less than or equal to 1 mol%.

11. The glass composition according to any one of claims 1 to 10, wherein the glass composition comprises Li2O in an amount greater than or equal to 6.5 mol% and less than or equal to 9.5 mol%.

12. The glass composition according to any one of claims 1 to 11, wherein the glass composition comprises Na2O in an amount greater than or equal to 4 mol% and less than or equal to 9.5 mol%.

13. The glass composition according to any one of claims 1 to 12, wherein the glass composition comprises TiO2 in an amount greater than 0 mol% and less than or equal to 3 mol%.

14. The glass composition according to any one of claims 1 to 13, wherein the glass composition comprises WO3 in an amount greater than 0 mol% and less than or equal to 3 mol%.

15. The glass composition according to any one of claims 1 to 14, wherein the glass composition comprises Y2O3 in an amount greater than 0 mol% and less than or equal to 3 mol%.

16. The glass composition according to any one of claims 1 to 15, wherein the glass composition has a K 1 / 2 fracture toughness of greater than or equal to 0.7 MPa·m as measured by the V-notch short rod method. Ic ​ 17. A glass article, comprising: SiO2 in an amount greater than or equal to 55 mol% and less than or equal to 70 mol%; Al2O3 in an amount greater than or equal to 12.5 mol% and less than or equal to 17.25 mol%; P2O5 in an amount greater than or equal to 0.1 mol% and less than or equal to 3.5 mol%; B2O3 in an amount greater than or equal to 0 mol% and less than or equal to 5.5 mol%; Li2O in an amount greater than or equal to 6 mol% and less than or equal to 10 mol%; Na2O in an amount greater than or equal to 3 mol% and less than or equal to 10 mol%; TiO2 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%; WO3 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%; and Y2O3 in an amount greater than or equal to 0 mol% and less than or equal to 3 mol%, wherein Al2O3 + B2O3 is greater than or equal to 12.5 mol% and less than or equal to 22.5 mol%, and TiO2 + WO3 + Y2O3 is greater than or equal to 0.2 mol% and less than or equal to 3 mol%.

18. The glass article according to claim 17, wherein TiO2 + WO3 + Y2O3 is greater than or equal to 0.4 mol% and less than or equal to 3 mol%.

19. The glass article according to claim 17 or claim 18, wherein Al2O3 + B2O3 is greater than or equal to 13.5 mol% and less than or equal to 21.5 mol%.

20. The glass article according to any one of claims 17 to 19, wherein the glass article comprises B2O3 in an amount greater than or equal to 0.1 mol% and less than or equal to 5.25 mol%.

21. The glass article according to any one of claims 17 to 20, wherein the glass article comprises Al2O3 in an amount greater than or equal to 13 mol% and less than or equal to 17 mol%.

22. The glass article according to any one of claims 17 to 21, wherein R2O is greater than or equal to 9 mol% and less than or equal to 20 mol%, and R2O is the sum of Li2O, Na2O, and K2O.

23. The glass article according to any one of claims 17 to 22, wherein the glass article comprises K2O in an amount greater than 0 mol% and less than or equal to 1 mol%.

24. The glass article according to any one of claims 17 to 23, wherein the glass article comprises more than 0 mol% and less than or equal to 6.5 mol% MgO.

25. The glass article according to any one of claims 17 to 24, wherein the glass article comprises more than 0 mol% and less than or equal to 6.5 mol% CaO.

26. The glass article according to any one of claims 17 to 25, wherein the glass article comprises more than 0 mol% and less than or equal to 1 mol% SnO2.

27. The glass article according to any one of claims 17 to 26, wherein the glass article is an ion-exchanged glass article.

28. The glass article according to claim 27, wherein the ion-exchanged glass article comprises a peak surface compressive stress of greater than or equal to 450 MPa.

29. The glass article according to claim 27 or claim 28, wherein the ion-exchanged glass article comprises a layer depth of greater than or equal to 5 μm.

30. The glass article according to any one of claims 27 to 29, wherein the ion-exchanged glass article comprises a maximum center tension of greater than or equal to 50 MPa measured at a product thickness of 0.8 mm.

31. A method of forming a glass article, the method comprising: heating a glass composition comprising: greater than or equal to 55 mol% and less than or equal to 70 mol% SiO2; greater than or equal to 12.5 mol% and less than or equal to 17.25 mol% Al2O3; greater than or equal to 0.1 mol% and less than or equal to 3.5 mol% P2O5; greater than or equal to 0 mol% and less than or equal to 5.5 mol% B2O3; greater than or equal to 6 mol% and less than or equal to 10 mol% Li2O; greater than or equal to 3 mol% and less than or equal to 10 mol% Na2O; greater than or equal to 0 mol% and less than or equal to 3 mol% TiO2; greater than or equal to 0 mol% and less than or equal to 3 mol% WO3; and greater than or equal to 0 mol% and less than or equal to 3 mol% Y2O3, wherein Al2O3 + B2O3 is greater than or equal to 12.5 mol% and less than or equal to 22.5 mol%, and TiO2 + WO3 + Y2O3 is greater than or equal to 0.2 mol% and less than or equal to 3 mol%; and cooling the glass composition to form the glass article.

32. The method according to claim 31, further comprising strengthening the glass article in an ion-exchange bath at a temperature of greater than or equal to 350 °C to less than or equal to 500 °C for a period of greater than or equal to 1 hour to less than or equal to 24 hours to form an ion-exchanged glass article.

33. The method according to claim 32, wherein the ion-exchanged glass article comprises a peak surface compressive stress of greater than or equal to 450 MPa.

34. The method according to claim 32 or claim 33, wherein the ion-exchanged glass article comprises a layer depth greater than or equal to 5 μm.

35. The method according to any one of claims 32 to 34, wherein the ion-exchanged glass article comprises a maximum central tension greater than or equal to 50 MPa measured at an article thickness of 0.8 mm.

36. The method according to any one of claims 32 to 35, wherein the ion-exchange bath comprises NaNO3.

37. The method according to any one of claims 32 to 36, wherein the ion-exchange bath comprises KNO3.

38. A consumer electronic device, comprising: a housing having a front surface, a rear surface, and side surfaces; and electrical components at least partially disposed within the housing, the electrical components at least including a controller, a memory, and a display, the display being disposed at or near the front surface of the housing; wherein the display comprises a glass article according to any one of claims 17 to 30.

Images